From: Dmitry Vyukov <dvyukov@google.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
dave@stgolabs.net, dave.hansen@linux.intel.com,
Hugh Dickins <hughd@google.com>, Joe Perches <joe@perches.com>,
sds@tycho.nsa.gov, Oleg Nesterov <oleg@redhat.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Rik van Riel <riel@redhat.com>,
mhocko@suse.cz, gang.chen.5i5j@gmail.com,
Peter Feiner <pfeiner@google.com>,
aarcange@redhat.com, "linux-mm@kvack.org" <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
syzkaller@googlegroups.com, Kostya Serebryany <kcc@google.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Sasha Levin <sasha.levin@oracle.com>
Subject: Re: GPF in shm_lock ipc
Date: Mon, 12 Oct 2015 13:44:32 +0200 [thread overview]
Message-ID: <CACT4Y+b6xXsK-qTGC67HxCJtZvcueQKXD7inpiLJ0+XEZv1NOw@mail.gmail.com> (raw)
In-Reply-To: <561B9C79.8030003@suse.cz>
On Mon, Oct 12, 2015 at 1:41 PM, Vlastimil Babka <vbabka@suse.cz> wrote:
> On 10/12/2015 11:55 AM, Dmitry Vyukov wrote:
>>
>> Hello,
>>
>> The following program crashes kernel:
>>
>> // autogenerated by syzkaller (http://github.com/google/syzkaller)
>> #include <syscall.h>
>> #include <string.h>
>> #include <stdint.h>
>>
>> int main()
>> {
>> long r0 = syscall(SYS_shmget, 0x0ul, 0x2ul, 0x8ul);
>> long r1 = syscall(SYS_shmat, r0, 0x20000000ul, 0x0ul);
>> long r2 = syscall(SYS_mremap, 0x20000000ul, 0x1000ul,
>> 0x3000ul, 0x3ul, 0x207f9000ul);
>> long r19 = syscall(SYS_shmctl, r0, 0x0ul, 0);
>> long r20 = syscall(SYS_remap_file_pages, 0x207f9000ul,
>> 0x3000ul, 0x0ul, 0x7ul, 0x0ul);
>> return 0;
>> }
>>
>> On commit dd36d7393d6310b0c1adefb22fba79c3cf8a577c
>> (git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git)
>>
>> ------------[ cut here ]------------
>> WARNING: CPU: 2 PID: 2636 at ipc/shm.c:162 shm_open+0x74/0x80()
>> Modules linked in:
>> CPU: 2 PID: 2636 Comm: a.out Not tainted 4.3.0-rc3+ #37
>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs
>> 01/01/2011
>> ffffffff81bcb43c ffff88081bf0bd70 ffffffff812fe8d6 0000000000000000
>> ffff88081bf0bda8 ffffffff81051ff1 ffffffffffffffea ffff88081b896ca8
>> ffff880819b81620 ffff8800bbaa6d00 ffff880819b81600 ffff88081bf0bdb8
>> Call Trace:
>> [< inline >] __dump_stack lib/dump_stack.c:15
>> [<ffffffff812fe8d6>] dump_stack+0x44/0x5e lib/dump_stack.c:50
>> [<ffffffff81051ff1>] warn_slowpath_common+0x81/0xc0 kernel/panic.c:447
>> [<ffffffff810520e5>] warn_slowpath_null+0x15/0x20 kernel/panic.c:480
>> [< inline >] shm_lock ipc/shm.c:162
>> [<ffffffff81295c64>] shm_open+0x74/0x80 ipc/shm.c:196
>> [<ffffffff81295cbe>] shm_mmap+0x4e/0x80 ipc/shm.c:399 (discriminator 2)
>> [<ffffffff81142d14>] mmap_region+0x3c4/0x5e0 mm/mmap.c:1627
>> [<ffffffff81143227>] do_mmap+0x2f7/0x3d0 mm/mmap.c:1402
>> [< inline >] do_mmap_pgoff include/linux/mm.h:1930
>> [< inline >] SYSC_remap_file_pages mm/mmap.c:2694
>
>
> Hmm what kind of stack unwinder catches inlines? Some external patch, based
> on debuginfo?
We use the following script to symbolize kernel stack traces. It adds
file:line info and inlined frames.
https://github.com/google/sanitizers/blob/master/address-sanitizer/tools/kasan_symbolize.py
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next prev parent reply other threads:[~2015-10-12 11:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 9:55 GPF in shm_lock ipc Dmitry Vyukov
2015-10-12 11:41 ` Vlastimil Babka
2015-10-12 11:44 ` Dmitry Vyukov [this message]
2015-10-12 12:27 ` Kirill A. Shutemov
2015-10-12 17:49 ` Davidlohr Bueso
2015-10-12 18:10 ` Kirill A. Shutemov
2015-10-12 18:55 ` Davidlohr Bueso
2015-10-13 3:18 ` Davidlohr Bueso
2015-10-13 12:30 ` Kirill A. Shutemov
2015-10-29 15:33 ` Dmitry Vyukov
2015-11-05 14:23 ` Kirill A. Shutemov
2015-12-21 15:44 ` Dmitry Vyukov
2016-01-02 11:33 ` Manfred Spraul
2016-01-02 12:19 ` Dmitry Vyukov
2016-01-02 15:58 ` Manfred Spraul
2016-02-02 3:25 ` Andrew Morton
2016-02-02 21:32 ` Dmitry Vyukov
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