From: syzbot <syzbot+b0d730107e2ca6cb952f@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: KASAN: slab-out-of-bounds Read in usage_accumulate
Date: Thu, 06 Jun 2019 06:52:11 -0700 [thread overview]
Message-ID: <000000000000454279058aa80535@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 156c0591 Merge tag 'linux-kselftest-5.2-rc4' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15f2095aa00000
kernel config: https://syzkaller.appspot.com/x/.config?x=60564cb52ab29d5b
dashboard link: https://syzkaller.appspot.com/bug?extid=b0d730107e2ca6cb952f
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a8fb61a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b0d730107e2ca6cb952f@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in usage_accumulate+0x9e/0xb0
kernel/locking/lockdep.c:1676
Read of size 8 at addr ffff8880a59cfed0 by task syz-executor.1/9366
CPU: 1 PID: 9366 Comm: syz-executor.1 Not tainted 5.2.0-rc3+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
Allocated by task 0:
(stack is not available)
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8880a59ce6c0
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2064 bytes to the right of
4096-byte region [ffff8880a59ce6c0, ffff8880a59cf6c0)
The buggy address belongs to the page:
page:ffffea0002967380 refcount:1 mapcount:0 mapping:ffff8880aa400dc0
index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000296a008 ffffea000233fe08 ffff8880aa400dc0
raw: 0000000000000000 ffff8880a59ce6c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a59cfd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a59cfe00: fc fc fc fc f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2
> ffff8880a59cfe80: 00 f2 f2 f2 00 f2 f2 f2 fc fc fc fc 00 00 00 f2
^
ffff8880a59cff00: f2 f2 f2 f2 fc fc fc fc 00 00 00 f3 f3 f3 f3 f3
ffff8880a59cff80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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next reply other threads:[~2019-06-06 13:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 13:52 syzbot [this message]
2019-06-06 14:41 ` KASAN: slab-out-of-bounds Read in usage_accumulate Dmitry Vyukov
2019-06-06 14:55 ` syzbot
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