diff options
| author | Barret Rhoden <brho@google.com> | 2020-04-14 18:29:20 -0400 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-04-30 20:14:36 +0200 |
| commit | 2ed6edd33a214bca02bd2b45e3fc3038a059436b (patch) | |
| tree | fecc8c994d7afd07581c2a56ab07c617e9304150 /arch/x86/events/intel/pt.c | |
| parent | 3a4ac121c2cacbf97d493fa3bc42ead88657abe4 (diff) | |
perf: Add cond_resched() to task_function_call()
Under rare circumstances, task_function_call() can repeatedly fail and
cause a soft lockup.
There is a slight race where the process is no longer running on the cpu
we targeted by the time remote_function() runs. The code will simply
try again. If we are very unlucky, this will continue to fail, until a
watchdog fires. This can happen in a heavily loaded, multi-core virtual
machine.
Reported-by: syzbot+bb4935a5c09b5ff79940@syzkaller.appspotmail.com
Signed-off-by: Barret Rhoden <brho@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200414222920.121401-1-brho@google.com
Diffstat (limited to 'arch/x86/events/intel/pt.c')
0 files changed, 0 insertions, 0 deletions