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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2016-08-02 14:02:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-02 17:31:41 -0400
commit4b3ec5a3f4b1d5c9d64b9ab704042400d050d432 (patch)
treefe3ea96a736855e72b6250ff92be94cafebb023f /mm
parent4a3d308d6674fabf213bce9c1a661ef43a85e515 (diff)
mm/kasan: don't reduce quarantine in atomic contexts
Currently we call quarantine_reduce() for ___GFP_KSWAPD_RECLAIM (implied by __GFP_RECLAIM) allocation. So, basically we call it on almost every allocation. quarantine_reduce() sometimes is heavy operation, and calling it with disabled interrupts may trigger hard LOCKUP: NMI watchdog: Watchdog detected hard LOCKUP on cpu 2irq event stamp: 1411258 Call Trace: <NMI> dump_stack+0x68/0x96 watchdog_overflow_callback+0x15b/0x190 __perf_event_overflow+0x1b1/0x540 perf_event_overflow+0x14/0x20 intel_pmu_handle_irq+0x36a/0xad0 perf_event_nmi_handler+0x2c/0x50 nmi_handle+0x128/0x480 default_do_nmi+0xb2/0x210 do_nmi+0x1aa/0x220 end_repeat_nmi+0x1a/0x1e <<EOE>> __kernel_text_address+0x86/0xb0 print_context_stack+0x7b/0x100 dump_trace+0x12b/0x350 save_stack_trace+0x2b/0x50 set_track+0x83/0x140 free_debug_processing+0x1aa/0x420 __slab_free+0x1d6/0x2e0 ___cache_free+0xb6/0xd0 qlist_free_all+0x83/0x100 quarantine_reduce+0x177/0x1b0 kasan_kmalloc+0xf3/0x100 Reduce the quarantine_reduce iff direct reclaim is allowed. Fixes: 55834c59098d("mm: kasan: initial memory quarantine implementation") Link: http://lkml.kernel.org/r/1470062715-14077-2-git-send-email-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Reported-by: Dave Jones <davej@codemonkey.org.uk> Acked-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/kasan/kasan.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 3019cecc0833..c99ef40ebdfa 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -565,7 +565,7 @@ void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size,
unsigned long redzone_start;
unsigned long redzone_end;
- if (flags & __GFP_RECLAIM)
+ if (gfpflags_allow_blocking(flags))
quarantine_reduce();
if (unlikely(object == NULL))
@@ -596,7 +596,7 @@ void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
unsigned long redzone_start;
unsigned long redzone_end;
- if (flags & __GFP_RECLAIM)
+ if (gfpflags_allow_blocking(flags))
quarantine_reduce();
if (unlikely(ptr == NULL))