All of lore.kernel.org
 help / color / mirror / Atom feed
* [perf] more perf_fuzzer memory corruption
@ 2014-04-15 21:37 Vince Weaver
  2014-04-15 21:49 ` Thomas Gleixner
  2014-04-16 14:15 ` Peter Zijlstra
  0 siblings, 2 replies; 81+ messages in thread
From: Vince Weaver @ 2014-04-15 21:37 UTC (permalink / raw)
  To: linux-kernel; +Cc: Thomas Gleixner, Peter Zijlstra, Ingo Molnar


Still tracking memory corruption bugs found by the perf_fuzzer, I have 
about 10 different log splats that I think might all be related to the 
same underlying problem.

Anyway I managed to trigger this using the perf_fuzzer:

[  221.065278] Slab corruption (Not tainted): kmalloc-2048 start=ffff8800cd15e800, len=2048
[  221.074062] 040: 6b 6b 6b 6b 6b 6b 6b 6b 98 72 57 cd 00 88 ff ff  kkkkkkkk.rW.....
[  221.082321] Prev obj: start=ffff8800cd15e000, len=2048
[  221.087933] 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  221.096224] 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk

And luckily I had ftrace running at the time.

The allocation of this block is by perf_event

perf_fuzzer-2520  [001]   182.980563: kmalloc:              (perf_event_alloc+0x55) call_site=ffffffff811399b5 ptr=0xffff8800cd15e800 bytes_req=1272 bytes_alloc=2048 gfp_flags=GFP_KERNEL|GFP_ZERO
perf_fuzzer-2520  [000]   183.628515: kmalloc:              (perf_event_alloc+0x55) call_site=ffffffff811399b5 ptr=0xffff8800cd15e800 bytes_req=1272 bytes_alloc=2048 gfp_flags=GFP_KERNEL|GFP_ZERO
perf_fuzzer-2520  [000]   183.628521: kfree:                (perf_event_alloc+0x2f7) call_site=ffffffff81139c57 ptr=0xffff8800cd15e800
perf_fuzzer-2520  [000]   183.628844: kmalloc:              (perf_event_alloc+0x55) call_site=ffffffff811399b5 ptr=0xffff8800cd15e800 bytes_req=1272 bytes_alloc=2048 gfp_flags=GFP_KERNEL|GFP_ZERO
...(thousands of times of kmalloc/kfree)

Is it worth wading through this mess to try to track down what happened?

Vince


^ permalink raw reply	[flat|nested] 81+ messages in thread

end of thread, other threads:[~2014-05-08 10:41 UTC | newest]

Thread overview: 81+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-04-15 21:37 [perf] more perf_fuzzer memory corruption Vince Weaver
2014-04-15 21:49 ` Thomas Gleixner
2014-04-16  3:21   ` Vince Weaver
2014-04-16  4:18     ` Vince Weaver
2014-04-16 14:15 ` Peter Zijlstra
2014-04-16 17:30   ` Vince Weaver
2014-04-16 17:43     ` Vince Weaver
2014-04-16 17:47       ` Peter Zijlstra
2014-04-17  9:48       ` Ingo Molnar
2014-04-17 11:45         ` Peter Zijlstra
2014-04-17 14:22           ` Ingo Molnar
2014-04-17 14:42             ` Vince Weaver
2014-04-17 14:54               ` Peter Zijlstra
2014-04-17 15:35                 ` Vince Weaver
2014-04-18 14:45                 ` Vince Weaver
2014-04-18 14:51                   ` Vince Weaver
2014-04-18 15:23                   ` Peter Zijlstra
2014-04-18 16:59                     ` Peter Zijlstra
2014-04-18 17:15                       ` Peter Zijlstra
2014-04-23 20:58                         ` Vince Weaver
2014-04-25  2:51                           ` Vince Weaver
2014-04-28 14:21                             ` Vince Weaver
2014-04-28 19:38                               ` Vince Weaver
2014-04-29  9:46                                 ` Peter Zijlstra
2014-04-29 18:21                                   ` Vince Weaver
2014-04-29 19:01                                     ` Peter Zijlstra
2014-04-29 20:59                                       ` Vince Weaver
2014-04-30 18:44                                         ` Peter Zijlstra
2014-04-30 21:08                                           ` Vince Weaver
2014-04-30 22:51                                             ` Thomas Gleixner
2014-05-01 10:26                                               ` Peter Zijlstra
2014-05-01 11:50                                                 ` Peter Zijlstra
2014-05-01 12:35                                                   ` Thomas Gleixner
2014-05-01 13:12                                                     ` Peter Zijlstra
2014-05-01 13:29                                                     ` Thomas Gleixner
2014-05-01 13:22                                                 ` Vince Weaver
2014-05-01 14:07                                           ` Vince Weaver
2014-05-01 14:27                                             ` Vince Weaver
2014-05-01 15:09                                               ` Peter Zijlstra
2014-05-01 15:50                                                 ` Vince Weaver
2014-05-01 16:31                                                   ` Thomas Gleixner
2014-05-01 17:18                                                     ` Vince Weaver
2014-05-01 18:49                                                       ` Vince Weaver
2014-05-01 21:32                                                         ` Vince Weaver
2014-05-02 11:15                                                         ` Peter Zijlstra
2014-05-02 15:42                                                         ` Peter Zijlstra
2014-05-02 16:22                                                           ` Vince Weaver
2014-05-02 16:22                                                             ` Peter Zijlstra
2014-05-02 16:43                                                               ` Vince Weaver
2014-05-02 17:27                                                                 ` Peter Zijlstra
2014-05-02 17:46                                                                   ` Vince Weaver
2014-05-02 19:12                                                                     ` Thomas Gleixner
2014-05-02 20:15                                                                       ` Vince Weaver
2014-05-02 20:45                                                                         ` Thomas Gleixner
2014-05-03  2:32                                                                           ` Vince Weaver
2014-05-03  3:02                                                                             ` Vince Weaver
2014-05-03  7:33                                                                               ` Peter Zijlstra
2014-05-05  9:31                                                                               ` Peter Zijlstra
2014-05-05 16:00                                                                                 ` Vince Weaver
2014-05-05 17:10                                                                                   ` Vince Weaver
2014-05-05 17:14                                                                                     ` Peter Zijlstra
2014-05-05 18:47                                                                                       ` Vince Weaver
2014-05-05 19:36                                                                                         ` Peter Zijlstra
2014-05-05 19:51                                                                                           ` Vince Weaver
2014-05-06  1:06                                                                                         ` Vince Weaver
2014-05-06 16:57                                                                                           ` Vince Weaver
2014-05-07 16:45                                                                                             ` Peter Zijlstra
2014-05-08 10:40                                                                                       ` [tip:perf/core] perf: Fix perf_event_init_context() tip-bot for Peter Zijlstra
2014-05-05 17:29                                                                                   ` [perf] more perf_fuzzer memory corruption Ingo Molnar
2014-05-06  4:51                                                                                     ` Vince Weaver
2014-05-06 17:06                                                                                       ` Vince Weaver
2014-05-07 19:12                                                                                         ` Ingo Molnar
2014-05-07 19:11                                                                                       ` Ingo Molnar
2014-05-08 10:40                                                                                 ` [tip:perf/core] perf: Fix race in removing an event tip-bot for Peter Zijlstra
2014-05-02 17:06                                                           ` [perf] more perf_fuzzer memory corruption Vince Weaver
2014-05-02 17:04                                                             ` Peter Zijlstra
2014-04-29 19:26                                     ` Steven Rostedt
2014-04-29  8:52                               ` Peter Zijlstra
2014-04-29 18:11                                 ` Vince Weaver
2014-04-29 19:21                                   ` Steven Rostedt
2014-04-28 17:48                             ` Thomas Gleixner

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.