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2020-01-22tracing: Fix uninitialized buffer var on early exit to trace_vbprintk()Steven Rostedt (VMware)
If we exit due to a bad input to trace_printk() (highly unlikely), then the buffer variable will not be initialized when we unnest the ring buffer. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-21tracing/boot: Fix an IS_ERR() vs NULL bugDan Carpenter
The trace_array_get_by_name() function doesn't return error pointers, it returns NULL on error. Link: http://lkml.kernel.org/r/20200117053007.5h2juv272pokqhtq@kili.mountain Fixes: 4f712a4d04a4 ("tracing/boot: Add instance node support") Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-21tracing: Remove unused TRACE_SEQ_BUF_USEDAlex Shi
This macro isn't used from commit 3a161d99c43c ("tracing: Create seq_buf layer in trace_seq"). so no needs to keep it. Link: http://lkml.kernel.org/r/1579586086-45543-1-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-21ring-buffer: Remove abandoned macro RB_MISSED_FLAGSAlex Shi
This macro isn't used since commit d325c402964e ("ring-buffer: Remove unused function ring_buffer_page_len()"), so better to remove it. Link: http://lkml.kernel.org/r/1579586080-45300-1-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-21ftrace: Remove NR_TO_INIT macroAlex Shi
This macro isn't used from commit cb7be3b2fc2c ("ftrace: remove daemon"). So no needs to keep it. Link: http://lkml.kernel.org/r/1579586063-44984-1-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-21ftrace: Remove abandoned macrosAlex Shi
These 2 macros aren't used from commit eee8ded131f1 ("ftrace: Have the function probes call their own function"), so remove them. Link: http://lkml.kernel.org/r/1579585807-43316-1-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-20tracing: Do not set trace clock if tracefs lockdown is in effectMasami Ichikawa
When trace_clock option is not set and unstable clcok detected, tracing_set_default_clock() sets trace_clock(ThinkPad A285 is one of case). In that case, if lockdown is in effect, null pointer dereference error happens in ring_buffer_set_clock(). Link: http://lkml.kernel.org/r/20200116131236.3866925-1-masami256@gmail.com Cc: stable@vger.kernel.org Fixes: 17911ff38aa58 ("tracing: Add locked_down checks to the open calls of files created for tracefs") Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1788488 Signed-off-by: Masami Ichikawa <masami256@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-20tracing: Fix histogram code when expression has same var as valueSteven Rostedt (VMware)
While working on a tool to convert SQL syntex into the histogram language of the kernel, I discovered the following bug: # echo 'first u64 start_time u64 end_time pid_t pid u64 delta' >> synthetic_events # echo 'hist:keys=pid:start=common_timestamp' > events/sched/sched_waking/trigger # echo 'hist:keys=next_pid:delta=common_timestamp-$start,start2=$start:onmatch(sched.sched_waking).trace(first,$start2,common_timestamp,next_pid,$delta)' > events/sched/sched_switch/trigger Would not display any histograms in the sched_switch histogram side. But if I were to swap the location of "delta=common_timestamp-$start" with "start2=$start" Such that the last line had: # echo 'hist:keys=next_pid:start2=$start,delta=common_timestamp-$start:onmatch(sched.sched_waking).trace(first,$start2,common_timestamp,next_pid,$delta)' > events/sched/sched_switch/trigger The histogram works as expected. What I found out is that the expressions clear out the value once it is resolved. As the variables are resolved in the order listed, when processing: delta=common_timestamp-$start The $start is cleared. When it gets to "start2=$start", it errors out with "unresolved symbol" (which is silent as this happens at the location of the trace), and the histogram is dropped. When processing the histogram for variable references, instead of adding a new reference for a variable used twice, use the same reference. That way, not only is it more efficient, but the order will no longer matter in processing of the variables. From Tom Zanussi: "Just to clarify some more about what the problem was is that without your patch, we would have two separate references to the same variable, and during resolve_var_refs(), they'd both want to be resolved separately, so in this case, since the first reference to start wasn't part of an expression, it wouldn't get the read-once flag set, so would be read normally, and then the second reference would do the read-once read and also be read but using read-once. So everything worked and you didn't see a problem: from: start2=$start,delta=common_timestamp-$start In the second case, when you switched them around, the first reference would be resolved by doing the read-once, and following that the second reference would try to resolve and see that the variable had already been read, so failed as unset, which caused it to short-circuit out and not do the trigger action to generate the synthetic event: to: delta=common_timestamp-$start,start2=$start With your patch, we only have the single resolution which happens correctly the one time it's resolved, so this can't happen." Link: https://lore.kernel.org/r/20200116154216.58ca08eb@gandalf.local.home Cc: stable@vger.kernel.org Fixes: 067fe038e70f6 ("tracing: Add variable reference handling to hist triggers") Reviewed-by: Tom Zanuss <zanussi@kernel.org> Tested-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-20Merge tag 'v5.5-rc7' into perf/core, to pick up fixesIngo Molnar
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2020-01-17tracing: Initialize ret in syscall_enter_define_fields()Steven Rostedt (VMware)
If syscall_enter_define_fields() is called on a system call with no arguments, the return code variable "ret" will never get initialized. Initialize it to zero. Fixes: 04ae87a52074e ("ftrace: Rework event_create_dir()") Reported-by: Qian Cai <cai@lca.pw> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/0FA8C6E3-D9F5-416D-A1B0-5E4CD583A101@lca.pw
2020-01-16tracing: Allow trace_printk() to nest in other tracing codeSteven Rostedt (VMware)
trace_printk() is used to debug the kernel which includes the tracing infrastructure. But because it writes to the ring buffer, and so does much of the tracing infrastructure, the ring buffer's recursive detection will drop writes to the ring buffer that is in the same context as the current write is happening (it allows interrupts to write when normal context is writing, but wont let normal context write while normal context is writing). This can cause confusion and think that the code is where the trace_printk() exists is not hit. To solve this, up the recursive nesting of the ring buffer when trace_printk() is called before it writes to the buffer itself. Note, this does make it dangerous to use trace_printk() in the ring buffer code itself, because this basically disables the recursion protection of trace_printk() buffer writes. But as trace_printk() is only used for debugging, and if this does occur, the developer will see the cause real quick (recursive blowing up of the stack). Thus the developer can deal with that. But having trace_printk() silently ignored is a much bigger problem, and disabling recursive protection is a small price to pay to fix it. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-15bpf: Add bpf_send_signal_thread() helperYonghong Song
Commit 8b401f9ed244 ("bpf: implement bpf_send_signal() helper") added helper bpf_send_signal() which permits bpf program to send a signal to the current process. The signal may be delivered to any threads in the process. We found a use case where sending the signal to the current thread is more preferable. - A bpf program will collect the stack trace and then send signal to the user application. - The user application will add some thread specific information to the just collected stack trace for later analysis. If bpf_send_signal() is used, user application will need to check whether the thread receiving the signal matches the thread collecting the stack by checking thread id. If not, it will need to send signal to another thread through pthread_kill(). This patch proposed a new helper bpf_send_signal_thread(), which sends the signal to the thread corresponding to the current kernel task. This way, user space is guaranteed that bpf_program execution context and user space signal handling context are the same thread. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200115035002.602336-1-yhs@fb.com
2020-01-14tracing: trigger: Replace unneeded RCU-list traversalsMasami Hiramatsu
With CONFIG_PROVE_RCU_LIST, I had many suspicious RCU warnings when I ran ftracetest trigger testcases. ----- # dmesg -c > /dev/null # ./ftracetest test.d/trigger ... # dmesg | grep "RCU-list traversed" | cut -f 2 -d ] | cut -f 2 -d " " kernel/trace/trace_events_hist.c:6070 kernel/trace/trace_events_hist.c:1760 kernel/trace/trace_events_hist.c:5911 kernel/trace/trace_events_trigger.c:504 kernel/trace/trace_events_hist.c:1810 kernel/trace/trace_events_hist.c:3158 kernel/trace/trace_events_hist.c:3105 kernel/trace/trace_events_hist.c:5518 kernel/trace/trace_events_hist.c:5998 kernel/trace/trace_events_hist.c:6019 kernel/trace/trace_events_hist.c:6044 kernel/trace/trace_events_trigger.c:1500 kernel/trace/trace_events_trigger.c:1540 kernel/trace/trace_events_trigger.c:539 kernel/trace/trace_events_trigger.c:584 ----- I investigated those warnings and found that the RCU-list traversals in event trigger and hist didn't need to use RCU version because those were called only under event_mutex. I also checked other RCU-list traversals related to event trigger list, and found that most of them were called from event_hist_trigger_func() or hist_unregister_trigger() or register/unregister functions except for a few cases. Replace these unneeded RCU-list traversals with normal list traversal macro and lockdep_assert_held() to check the event_mutex is held. Link: http://lkml.kernel.org/r/157680910305.11685.15110237954275915782.stgit@devnote2 Cc: stable@vger.kernel.org Fixes: 30350d65ac567 ("tracing: Add variable support to hist triggers") Reviewed-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-14ring-buffer: Fix kernel doc for rb_update_event()Steven Rostedt (VMware)
rb_update_event has changed without the kernel-doc update. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-14ring-bufer: kernel-doc warning fixesFabian Frederick
Also fixes a couple of typos Link: http://lkml.kernel.org/r/1401992525-10417-1-git-send-email-fabf@skynet.be Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Fabian Frederick <fabf@skynet.be> [ Found this deep in the abyss of my INBOX ] Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-14tracing/uprobe: Fix double perf_event linking on multiprobe uprobeMasami Hiramatsu
Fix double perf_event linking to trace_uprobe_filter on multiple uprobe event by moving trace_uprobe_filter under trace_probe_event. In uprobe perf event, trace_uprobe_filter data structure is managing target mm filters (in perf_event) related to each uprobe event. Since commit 60d53e2c3b75 ("tracing/probe: Split trace_event related data from trace_probe") left the trace_uprobe_filter data structure in trace_uprobe, if a trace_probe_event has multiple trace_uprobe (multi-probe event), a perf_event is added to different trace_uprobe_filter on each trace_uprobe. This leads a linked list corruption. To fix this issue, move trace_uprobe_filter to trace_probe_event and link it once on each event instead of each probe. Link: http://lkml.kernel.org/r/157862073931.1800.3800576241181489174.stgit@devnote2 Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: "Naveen N . Rao" <naveen.n.rao@linux.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: "David S . Miller" <davem@davemloft.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: =?utf-8?q?Toke_H=C3=B8iland-J?= =?utf-8?b?w7hyZ2Vuc2Vu?= <thoiland@redhat.com> Cc: Jean-Tsung Hsiao <jhsiao@redhat.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: stable@vger.kernel.org Fixes: 60d53e2c3b75 ("tracing/probe: Split trace_event related data from trace_probe") Link: https://lkml.kernel.org/r/20200108171611.GA8472@kernel.org Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: trigger: Replace unneeded RCU-list traversalsMasami Hiramatsu
With CONFIG_PROVE_RCU_LIST, I had many suspicious RCU warnings when I ran ftracetest trigger testcases. ----- # dmesg -c > /dev/null # ./ftracetest test.d/trigger ... # dmesg | grep "RCU-list traversed" | cut -f 2 -d ] | cut -f 2 -d " " kernel/trace/trace_events_hist.c:6070 kernel/trace/trace_events_hist.c:1760 kernel/trace/trace_events_hist.c:5911 kernel/trace/trace_events_trigger.c:504 kernel/trace/trace_events_hist.c:1810 kernel/trace/trace_events_hist.c:3158 kernel/trace/trace_events_hist.c:3105 kernel/trace/trace_events_hist.c:5518 kernel/trace/trace_events_hist.c:5998 kernel/trace/trace_events_hist.c:6019 kernel/trace/trace_events_hist.c:6044 kernel/trace/trace_events_trigger.c:1500 kernel/trace/trace_events_trigger.c:1540 kernel/trace/trace_events_trigger.c:539 kernel/trace/trace_events_trigger.c:584 ----- I investigated those warnings and found that the RCU-list traversals in event trigger and hist didn't need to use RCU version because those were called only under event_mutex. I also checked other RCU-list traversals related to event trigger list, and found that most of them were called from event_hist_trigger_func() or hist_unregister_trigger() or register/unregister functions except for a few cases. Replace these unneeded RCU-list traversals with normal list traversal macro and lockdep_assert_held() to check the event_mutex is held. Link: http://lkml.kernel.org/r/157680910305.11685.15110237954275915782.stgit@devnote2 Reviewed-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot: Add function tracer filter optionsMasami Hiramatsu
Add below function-tracer filter options to boot-time tracing. - ftrace.[instance.INSTANCE.]ftrace.filters This will take an array of tracing function filter rules - ftrace.[instance.INSTANCE.]ftrace.notraces This will take an array of NON-tracing function filter rules Link: http://lkml.kernel.org/r/157867244841.17873.10933616628243103561.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot: Add cpu_mask option supportMasami Hiramatsu
Add ftrace.cpumask option support to boot-time tracing. This sets cpumask for each instance. - ftrace.[instance.INSTANCE.]cpumask = CPUMASK; Set the trace cpumask. Note that the CPUMASK should be a string which <tracefs>/tracing_cpumask can accepts. Link: http://lkml.kernel.org/r/157867243625.17873.13613922641273149372.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot: Add instance node supportMasami Hiramatsu
Add instance node support to boot-time tracing. User can set some options and event nodes under instance node. - ftrace.instance.INSTANCE[...] Add new INSTANCE instance. Some options and event nodes are acceptable for instance node. Link: http://lkml.kernel.org/r/157867242413.17873.9814204526141500278.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot: Add synthetic event supportMasami Hiramatsu
Add synthetic event node support to boot time tracing. The synthetic event is a kind of event node, but the group name is "synthetic". - ftrace.event.synthetic.EVENT.fields = FIELD[, FIELD2...] Defines new synthetic event with FIELDs. Each field should be "type varname". The synthetic node requires "fields" string arraies, which defines the fields as same as tracing/synth_events interface. Link: http://lkml.kernel.org/r/157867241236.17873.12411615143321557709.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot Add kprobe event supportMasami Hiramatsu
Add kprobe event support on event node to boot-time tracing. If the group name of event is "kprobes", the boot-time tracing defines new probe event according to "probes" values. - ftrace.event.kprobes.EVENT.probes = PROBE[, PROBE2...] Defines new kprobe event based on PROBEs. It is able to define multiple probes on one event, but those must have same type of arguments. For example, ftrace.events.kprobes.myevent { probes = "vfs_read $arg1 $arg2"; enable; } This will add kprobes:myevent on vfs_read with the 1st and the 2nd arguments. Link: http://lkml.kernel.org/r/157867240104.17873.9712052065426433111.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot: Add per-event settingsMasami Hiramatsu
Add per-event settings for boottime tracing. User can set filter, actions and enable on each event on boot. The event entries are under ftrace.event.GROUP.EVENT node (note that the option key includes event's group name and event name.) This supports below configs. - ftrace.event.GROUP.EVENT.enable Enables GROUP:EVENT tracing. - ftrace.event.GROUP.EVENT.filter = FILTER Set FILTER rule to the GROUP:EVENT. - ftrace.event.GROUP.EVENT.actions = ACTION[, ACTION2...] Set ACTIONs to the GROUP:EVENT. For example, ftrace.event.sched.sched_process_exec { filter = "pid < 128" enable } this will enable tracing "sched:sched_process_exec" event with "pid < 128" filter. Link: http://lkml.kernel.org/r/157867238942.17873.11177628789184546198.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing/boot: Add boot-time tracingMasami Hiramatsu
Setup tracing options via extra boot config in addition to kernel command line. This adds following commands support. These are applied to the global trace instance. - ftrace.options = OPT1[,OPT2...] Enable given ftrace options. - ftrace.trace_clock = CLOCK Set given CLOCK to ftrace's trace_clock. - ftrace.buffer_size = SIZE Configure ftrace buffer size to SIZE. You can use "KB" or "MB" for that SIZE. - ftrace.events = EVENT[, EVENT2...] Enable given events on boot. You can use a wild card in EVENT. - ftrace.tracer = TRACER Set TRACER to current tracer on boot. (e.g. function) Note that this is NOT replacing the kernel parameters, because this boot config based setting is later than that. If you want to trace earlier boot events, you still need kernel parameters. Link: http://lkml.kernel.org/r/157867237723.17873.17494943526320587488.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: Add NULL trace-array check in print_synth_event()Masami Hiramatsu
Add NULL trace-array check in print_synth_event(), because if we enable tp_printk option, iter->tr can be NULL. Link: http://lkml.kernel.org/r/157867236536.17873.12529350542460184019.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: Accept different type for synthetic event fieldsMasami Hiramatsu
Make the synthetic event accepts a different type field to record. However, the size and signed flag must be same. Link: http://lkml.kernel.org/r/157867235358.17873.61732996461602171.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: kprobes: Register to dynevent earlier stageMasami Hiramatsu
Register kprobe event to dynevent in subsys_initcall level. This will allow kernel to register new kprobe events in fs_initcall level via trace_run_command. Link: http://lkml.kernel.org/r/157867234213.17873.18039000024374948737.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: kprobes: Output kprobe event to printk bufferMasami Hiramatsu
Since kprobe-events use event_trigger_unlock_commit_regs() directly, that events doesn't show up in printk buffer if "tp_printk" is set. Use trace_event_buffer_commit() in kprobe events so that it can invoke output_printk() as same as other trace events. Link: http://lkml.kernel.org/r/157867233085.17873.5210928676787339604.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> [ Adjusted data var declaration placement in __kretprobe_trace_func() ] Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: Apply soft-disabled and filter to tracepoints printkMasami Hiramatsu
Apply soft-disabled and the filter rule of the trace events to the printk output of tracepoints (a.k.a. tp_printk kernel parameter) as same as trace buffer output. Link: http://lkml.kernel.org/r/157867231876.17873.15825819592284704068.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: Make struct ring_buffer less ambiguousSteven Rostedt (VMware)
As there's two struct ring_buffers in the kernel, it causes some confusion. The other one being the perf ring buffer. It was agreed upon that as neither of the ring buffers are generic enough to be used globally, they should be renamed as: perf's ring_buffer -> perf_buffer ftrace's ring_buffer -> trace_buffer This implements the changes to the ring buffer that ftrace uses. Link: https://lore.kernel.org/r/20191213140531.116b3200@gandalf.local.home Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13tracing: Rename trace_buffer to array_bufferSteven Rostedt (VMware)
As we are working to remove the generic "ring_buffer" name that is used by both tracing and perf, the ring_buffer name for tracing will be renamed to trace_buffer, and perf's ring buffer will be renamed to perf_buffer. As there already exists a trace_buffer that is used by the trace_arrays, it needs to be first renamed to array_buffer. Link: https://lore.kernel.org/r/20191213153553.GE20583@krava Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-03tracing: Fix indentation issueColin Ian King
There is a declaration that is indented one level too deeply, remove the extraneous tab. Link: http://lkml.kernel.org/r/20191221154825.33073-1-colin.king@canonical.com Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-03kernel/trace: Fix do not unregister tracepoints when register ↵Kaitao Cheng
sched_migrate_task fail In the function, if register_trace_sched_migrate_task() returns error, sched_switch/sched_wakeup_new/sched_wakeup won't unregister. That is why fail_deprobe_sched_switch was added. Link: http://lkml.kernel.org/r/20191231133530.2794-1-pilgrimtao@gmail.com Cc: stable@vger.kernel.org Fixes: 478142c39c8c2 ("tracing: do not grab lock in wakeup latency function tracing") Signed-off-by: Kaitao Cheng <pilgrimtao@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-02ftrace: Avoid potential division by zero in function profilerWen Yang
The ftrace_profile->counter is unsigned long and do_div truncates it to 32 bits, which means it can test non-zero and be truncated to zero for division. Fix this issue by using div64_ul() instead. Link: http://lkml.kernel.org/r/20200103030248.14516-1-wenyang@linux.alibaba.com Cc: stable@vger.kernel.org Fixes: e330b3bcd8319 ("tracing: Show sample std dev in function profiling") Fixes: 34886c8bc590f ("tracing: add average time in function to function profiler") Signed-off-by: Wen Yang <wenyang@linux.alibaba.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-02tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not definedSteven Rostedt (VMware)
On some archs with some configurations, MCOUNT_INSN_SIZE is not defined, and this makes the stack tracer fail to compile. Just define it to zero in this case. Link: https://lore.kernel.org/r/202001020219.zvE3vsty%lkp@intel.com Cc: stable@vger.kernel.org Fixes: 4df297129f622 ("tracing: Remove most or all of stack tracer stack size from stack_max_size") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-02tracing: Define MCOUNT_INSN_SIZE when not defined without direct callsSteven Rostedt (VMware)
In order to handle direct calls along side of function graph tracer, a check is made to see if the address being traced by the function graph tracer is a direct call or not. To get the address used by direct callers, the return address is subtracted by MCOUNT_INSN_SIZE. For some archs with certain configurations, MCOUNT_INSN_SIZE is undefined here. But these should not be using direct calls anyway. Just define MCOUNT_INSN_SIZE to zero in this case. Link: https://lore.kernel.org/r/202001020219.zvE3vsty%lkp@intel.com Reported-by: kbuild test robot <lkp@intel.com> Fixes: ff205766dbbee ("ftrace: Fix function_graph tracer interaction with BPF trampoline") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-02tracing: Initialize val to zero in parse_entry of inject codeSteven Rostedt (VMware)
gcc produces a variable may be uninitialized warning for "val" in parse_entry(). This is really a false positive, but the code is subtle enough to just initialize val to zero and it's not a fast path to worry about it. Marked for stable to remove the warning in the stable trees as well. Cc: stable@vger.kernel.org Fixes: 6c3edaf9fd6a3 ("tracing: Introduce trace event injection") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-25Merge branch 'core/kprobes' into perf/core, to pick up a completed branchIngo Molnar
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-12-21tracing: Fix endianness bug in histogram triggerSven Schnelle
At least on PA-RISC and s390 synthetic histogram triggers are failing selftests because trace_event_raw_event_synth() always writes a 64 bit values, but the reader expects a field->size sized value. On little endian machines this doesn't hurt, but on big endian this makes the reader always read zero values. Link: http://lore.kernel.org/linux-trace-devel/20191218074427.96184-4-svens@linux.ibm.com Cc: stable@vger.kernel.org Fixes: 4b147936fa509 ("tracing: Add support for 'synthetic' events") Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-21tracing: Fix lock inversion in trace_event_enable_tgid_record()Prateek Sood
Task T2 Task T3 trace_options_core_write() subsystem_open() mutex_lock(trace_types_lock) mutex_lock(event_mutex) set_tracer_flag() trace_event_enable_tgid_record() mutex_lock(trace_types_lock) mutex_lock(event_mutex) This gives a circular dependency deadlock between trace_types_lock and event_mutex. To fix this invert the usage of trace_types_lock and event_mutex in trace_options_core_write(). This keeps the sequence of lock usage consistent. Link: http://lkml.kernel.org/r/0101016eef175e38-8ca71caf-a4eb-480d-a1e6-6f0bbc015495-000000@us-west-2.amazonses.com Cc: stable@vger.kernel.org Fixes: d914ba37d7145 ("tracing: Add support for recording tgid of tasks") Signed-off-by: Prateek Sood <prsood@codeaurora.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-19tracing: Have the histogram compare functions convert to u64 firstSteven Rostedt (VMware)
The compare functions of the histogram code would be specific for the size of the value being compared (byte, short, int, long long). It would reference the value from the array via the type of the compare, but the value was stored in a 64 bit number. This is fine for little endian machines, but for big endian machines, it would end up comparing zeros or all ones (depending on the sign) for anything but 64 bit numbers. To fix this, first derference the value as a u64 then convert it to the type being compared. Link: http://lkml.kernel.org/r/20191211103557.7bed6928@gandalf.local.home Cc: stable@vger.kernel.org Fixes: 08d43a5fa063e ("tracing: Add lock-free tracing_map") Acked-by: Tom Zanussi <zanussi@kernel.org> Reported-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-19tracing: Avoid memory leak in process_system_preds()Keita Suzuki
When failing in the allocation of filter_item, process_system_preds() goes to fail_mem, where the allocated filter is freed. However, this leads to memory leak of filter->filter_string and filter->prog, which is allocated before and in process_preds(). This bug has been detected by kmemleak as well. Fix this by changing kfree to __free_fiter. unreferenced object 0xffff8880658007c0 (size 32): comm "bash", pid 579, jiffies 4295096372 (age 17.752s) hex dump (first 32 bytes): 63 6f 6d 6d 6f 6e 5f 70 69 64 20 20 3e 20 31 30 common_pid > 10 00 00 00 00 00 00 00 00 65 73 00 00 00 00 00 00 ........es...... backtrace: [<0000000067441602>] kstrdup+0x2d/0x60 [<00000000141cf7b7>] apply_subsystem_event_filter+0x378/0x932 [<000000009ca32334>] subsystem_filter_write+0x5a/0x90 [<0000000072da2bee>] vfs_write+0xe1/0x240 [<000000004f14f473>] ksys_write+0xb4/0x150 [<00000000a968b4a0>] do_syscall_64+0x6d/0x1e0 [<000000001a189f40>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 unreferenced object 0xffff888060c22d00 (size 64): comm "bash", pid 579, jiffies 4295096372 (age 17.752s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 e8 d7 41 80 88 ff ff ...........A.... 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b8c1b109>] process_preds+0x243/0x1820 [<000000003972c7f0>] apply_subsystem_event_filter+0x3be/0x932 [<000000009ca32334>] subsystem_filter_write+0x5a/0x90 [<0000000072da2bee>] vfs_write+0xe1/0x240 [<000000004f14f473>] ksys_write+0xb4/0x150 [<00000000a968b4a0>] do_syscall_64+0x6d/0x1e0 [<000000001a189f40>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 unreferenced object 0xffff888041d7e800 (size 512): comm "bash", pid 579, jiffies 4295096372 (age 17.752s) hex dump (first 32 bytes): 70 bc 85 97 ff ff ff ff 0a 00 00 00 00 00 00 00 p............... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000001e04af34>] process_preds+0x71a/0x1820 [<000000003972c7f0>] apply_subsystem_event_filter+0x3be/0x932 [<000000009ca32334>] subsystem_filter_write+0x5a/0x90 [<0000000072da2bee>] vfs_write+0xe1/0x240 [<000000004f14f473>] ksys_write+0xb4/0x150 [<00000000a968b4a0>] do_syscall_64+0x6d/0x1e0 [<000000001a189f40>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Link: http://lkml.kernel.org/r/20191211091258.11310-1-keitasuzuki.park@sslab.ics.keio.ac.jp Cc: Ingo Molnar <mingo@redhat.com> Cc: stable@vger.kernel.org Fixes: 404a3add43c9c ("tracing: Only add filter list when needed") Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-11Merge tag 'trace-v5.5-3' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: - Remove code I accidentally applied when doing a minor fix up to a patch, and then using "git commit -a --amend", which pulled in some other changes I was playing with. - Remove an used variable in trace_events_inject code - Fix function graph tracer when it traces a ftrace direct function. It will now ignore tracing a function that has a ftrace direct tramploine attached. This is needed for eBPF to use the ftrace direct code. * tag 'trace-v5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ftrace: Fix function_graph tracer interaction with BPF trampoline tracing: remove set but not used variable 'buffer' module: Remove accidental change of module_enable_x()
2019-12-10simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystemsAl Viro
two requirements: no file creations in IS_DEADDIR and no cross-directory renames whatsoever. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-12-10ftrace: Fix function_graph tracer interaction with BPF trampolineAlexei Starovoitov
Depending on type of BPF programs served by BPF trampoline it can call original function. In such case the trampoline will skip one stack frame while returning. That will confuse function_graph tracer and will cause crashes with bad RIP. Teach graph tracer to skip functions that have BPF trampoline attached. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-10tracing: remove set but not used variable 'buffer'YueHaibing
kernel/trace/trace_events_inject.c: In function trace_inject_entry: kernel/trace/trace_events_inject.c:20:22: warning: variable buffer set but not used [-Wunused-but-set-variable] It is never used, so remove it. Link: http://lkml.kernel.org/r/20191207034409.25668-1-yuehaibing@huawei.com Reported-by: Hulk Robot <hulkci@huawei.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-12-10Merge tag 'v5.5-rc1' into core/kprobes, to resolve conflictsIngo Molnar
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-12-06Fix up for "printk: Drop pr_warning definition"Stephen Rothwell
Link: http://lkml.kernel.org/r/20191206092503.303d6a57@canb.auug.org.au Cc: Linux Next Mailing List <linux-next@vger.kernel.org> Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org> Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Petr Mladek <pmladek@suse.com>
2019-12-04Merge tag 'trace-v5.5-2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull more tracing updates from Steven Rostedt: "Two fixes and one patch that was missed: Fixes: - Missing __print_hex_dump undef for processing new function in trace events - Stop WARN_ON messages when lockdown disables tracing on boot up Enhancement: - Debug option to inject trace events from userspace (for rasdaemon)" The enhancement has its own config option and is non invasive. It's been discussed for sever months and should have been added to my original push, but I never pulled it into my queue. * tag 'trace-v5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Do not create directories if lockdown is in affect tracing: Introduce trace event injection tracing: Fix __print_hex_dump scope
2019-12-04tracing: Do not create directories if lockdown is in affectSteven Rostedt (VMware)
If lockdown is disabling tracing on boot up, it prevents the tracing files from even bering created. But when that happens, there's several places that will give a warning that the files were not created as that is usually a sign of a bug. Add in strategic locations where a check is made to see if tracing is disabled by lockdown, and if it is, do not go further, and fail silently (but print that tracing is disabled by lockdown, without doing a WARN_ON()). Cc: Matthew Garrett <mjg59@google.com> Fixes: 17911ff38aa5 ("tracing: Add locked_down checks to the open calls of files created for tracefs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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