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From: Vince Weaver <vincent.weaver@maine.edu>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	"H.J. Lu" <hjl.tools@gmail.com>
Subject: Re: perf_fuzzer compiled for x32 causes reboot
Date: Fri, 21 Feb 2014 17:13:50 -0500 (EST)
Message-ID: <alpine.DEB.2.10.1402211701380.6395@vincent-weaver-1.um.maine.edu> (raw)
In-Reply-To: <alpine.DEB.2.10.1402211521040.6395@vincent-weaver-1.um.maine.edu>


cc'ing x32 people

On Fri, 21 Feb 2014, Vince Weaver wrote:

> So I'm not sure who exactly to report this to.  Some perf people CC'd as
> I trigger it while using the perf_fuzzer.
> 
> This is with 3.14-rc3 on a core2 machine, although I've had the reboots 
> happen throughout at least 3.14-rc*
> 
> I'm having a hard time coming up with a reproducible test case.  Using the 
> random seed that caused the below will cause the perf_fuzzer to segfault 
> but not reboot.
> 
> The log isn't very helpful, it reboots so fast that the oops doesn't 
> finish printing and the serial log just moves to the bootloader...
> 
> [ 4466.804123] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
> [ 4466.808014] IP: [<ffffffff81111783>] cache_reap+0x5e/0x1c5
> [ 4466.808014] PGD 0 
> [ 4466.808014] Oops: 0000 [#1] GNU GRUB  version 2.00-17

Maybe related, this is on an x32-compiled binary.

When trying to reproduce the perf_fuzzer myseriously segfaults on what 
appears to be perfectly valid mmap'd perf ring-buffers.

(running under gdb)

Program received signal SIGSEGV, Segmentation fault.
0x0041efbb in __memset_sse2 ()

=> 0x0041efbb <+2203>:  movdqa %xmm0,(%rdi)

rdi            0xf7f61000       4160098304

f7f61000-f7f72000 rw-s 00000000 00:08 4475  anon_inode:[perf_event]

So I'm not sure if somehow something is wrong with the page mapping, that 
makes a valid write fail and sometimes (possibly due to address space 
randomization) reboot the system?

Vince


  reply index

Thread overview: 115+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-21 20:25 perf_fuzzer " Vince Weaver
2014-02-21 22:13 ` Vince Weaver [this message]
2014-02-21 22:34   ` perf_fuzzer compiled for x32 " Vince Weaver
2014-02-22  4:50     ` Vince Weaver
2014-02-22  5:03       ` H. Peter Anvin
2014-02-22  6:26       ` H. Peter Anvin
2014-02-23  5:18         ` Vince Weaver
2014-02-23  5:24           ` H. Peter Anvin
2014-02-23  6:07           ` H. Peter Anvin
2014-02-23 14:05             ` Vince Weaver
2014-02-24  3:02               ` Vince Weaver
2014-02-24  5:22                 ` H. Peter Anvin
2014-02-24 15:35                   ` Vince Weaver
2014-02-24 16:34                     ` Vince Weaver
2014-02-24 16:47                       ` H. Peter Anvin
2014-02-24 17:10                         ` Vince Weaver
2014-02-24 17:25                           ` Peter Zijlstra
2014-02-24 17:32                             ` Vince Weaver
2014-02-24 17:40                               ` H. Peter Anvin
2014-02-24 18:00                                 ` Vince Weaver
2014-02-24 18:07                                   ` Vince Weaver
2014-02-24 18:34                                     ` H. Peter Anvin
2014-02-24 19:13                                       ` Steven Rostedt
2014-02-24 19:15                                         ` H. Peter Anvin
2014-02-24 19:30                                         ` Peter Zijlstra
2014-02-24 19:32                                           ` Steven Rostedt
2014-02-25  3:49                                           ` H. Peter Anvin
2014-02-25 14:07                                             ` Vince Weaver
2014-02-25 14:34                                               ` H. Peter Anvin
2014-02-25 14:43                                                 ` Steven Rostedt
2014-02-25 15:33                                                   ` Vince Weaver
2014-02-26 15:06                                                     ` Vince Weaver
2014-02-27 22:06                                                       ` Vince Weaver
2014-02-27 22:31                                                         ` Steven Rostedt
2014-02-27 22:52                                                           ` H. Peter Anvin
2014-02-27 23:30                                                             ` Steven Rostedt
2014-02-27 23:46                                                               ` H. Peter Anvin
2014-02-28  1:00                                                                 ` Vince Weaver
2014-02-28 20:34                                                                   ` Paul E. McKenney
2014-02-28 20:47                                                                     ` Steven Rostedt
2014-02-28 20:54                                                                       ` Peter Zijlstra
2014-02-28 21:17                                                                         ` Paul E. McKenney
2014-02-28 21:27                                                                           ` Peter Zijlstra
2014-02-28 21:51                                                                             ` Paul E. McKenney
2014-02-28 21:55                                                                               ` Peter Zijlstra
2014-02-28 22:05                                                                                 ` Steven Rostedt
2014-02-28 22:23                                                                                   ` Paul E. McKenney
2014-02-28  1:34                                                             ` Vince Weaver
2014-02-28  2:17                                                               ` H. Peter Anvin
2014-02-28  2:57                                                               ` Steven Rostedt
2014-02-28 11:11                                                                 ` Peter Zijlstra
2014-02-28 13:37                                                                   ` Steven Rostedt
2014-02-28 14:15                                                                 ` Vince Weaver
2014-02-28 14:23                                                                   ` Steven Rostedt
2014-02-28 15:07                                                                     ` Vince Weaver
2014-02-28 15:13                                                                       ` H. Peter Anvin
2014-02-28 15:40                                                                         ` Peter Zijlstra
2014-02-28 16:15                                                                           ` H. Peter Anvin
2014-02-28 16:29                                                                             ` Steven Rostedt
2014-02-28 19:33                                                                               ` [PATCH] x86: Rename copy_from_user_nmi() to copy_from_user_trace() Steven Rostedt
2014-02-28 20:46                                                                                 ` Peter Zijlstra
2014-02-28 20:51                                                                                   ` Steven Rostedt
2014-02-28 20:58                                                                                     ` Peter Zijlstra
2014-02-28 21:01                                                                                   ` Steven Rostedt
2014-02-28 21:17                                                                                     ` Peter Zijlstra
2014-02-28 20:56                                                                               ` perf_fuzzer compiled for x32 causes reboot Peter Zijlstra
2014-02-28 21:06                                                                                 ` Steven Rostedt
2014-03-01  9:16                                                                                   ` Ingo Molnar
2014-03-01  9:50                                                                                     ` Borislav Petkov
2014-03-01 16:50                                                                                       ` H. Peter Anvin
2014-03-04 23:05                                                                                         ` Borislav Petkov
2014-03-03  9:16                                                                                     ` Peter Zijlstra
2014-02-28 20:55                                                                             ` Peter Zijlstra
2014-02-28 15:20                                                                       ` Steven Rostedt
2014-02-28 15:30                                                                         ` Steven Rostedt
2014-02-28 20:38                                                                       ` H. Peter Anvin
2014-02-28 20:46                                                                         ` Steven Rostedt
2014-02-28 21:18                                                                         ` Vince Weaver
2014-02-28 21:30                                                                           ` Steven Rostedt
2014-02-28 23:34                                                                             ` Vince Weaver
2014-03-01  0:43                                                                               ` H. Peter Anvin
2014-03-01  3:36                                                                               ` Steven Rostedt
2014-03-01 16:24                                                                                 ` Andi Kleen
2014-03-02 15:34                                                                                   ` Vince Weaver
2014-03-02 16:02                                                                                 ` Vince Weaver
2014-02-28  9:39                                                           ` Peter Zijlstra
2014-02-24 17:40                               ` Peter Zijlstra
2014-02-24 17:41                               ` Vince Weaver
2014-02-24 17:42                                 ` H. Peter Anvin
2014-02-24 17:52                             ` H. Peter Anvin
2014-02-28 15:33 [PATCH] x86 trace: Fix page fault tracing bug Jiri Olsa
2014-02-28 15:47 ` Peter Zijlstra
2014-02-28 16:05   ` [PATCHv2] " Jiri Olsa
2014-02-28 16:11     ` H. Peter Anvin
2014-02-28 16:23       ` Steven Rostedt
2014-02-28 16:15     ` Steven Rostedt
2014-03-05  0:03     ` [tip:x86/urgent] x86, trace: Fix CR2 corruption when tracing page faults tip-bot for Jiri Olsa
2014-03-05 11:14       ` Peter Zijlstra
2014-03-05 12:20         ` Steven Rostedt
2014-03-05 12:25           ` Peter Zijlstra
2014-03-05 12:33             ` Steven Rostedt
2014-03-05 12:54               ` Peter Zijlstra
2014-03-05 13:02                 ` Peter Zijlstra
2014-03-05 13:07                   ` Peter Zijlstra
2014-03-05 12:36             ` Peter Zijlstra
2014-03-05 13:00               ` Steven Rostedt
2014-03-05 13:08                 ` Peter Zijlstra
2014-03-05 21:37                   ` H. Peter Anvin
2014-03-06  8:40                     ` Peter Zijlstra
2014-03-06 11:02                       ` Steven Rostedt
2014-03-06 14:53                         ` [PATCH] x86: Further robustify CR2 handling vs tracing Peter Zijlstra
2014-03-07 23:07                           ` [tip:x86/urgent] x86, trace: " tip-bot for Peter Zijlstra
2014-02-28 15:47 ` [PATCH] x86 trace: Fix page fault tracing bug Jiri Olsa
2014-02-28 16:00   ` Steven Rostedt
2014-02-28 16:01 ` Steven Rostedt

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