lkml.org 
[lkml]   [2020]   [Jan]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectKCSAN: data-race in pid_update_inode / pid_update_inode
From
Hello,

syzbot found the following crash on:

HEAD commit: 245a4300 Merge branch 'rcu/kcsan' into tip/locking/kcsan
git tree: https://github.com/google/ktsan.git kcsan
console output: https://syzkaller.appspot.com/x/log.txt?x=123776e1e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a38292766f8efdaa
dashboard link: https://syzkaller.appspot.com/bug?extid=41a393c8d33874c463e9
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+41a393c8d33874c463e9@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in pid_update_inode / pid_update_inode

read to 0xffff88812b806828 of 2 bytes by task 11180 on cpu 1:
pid_update_inode+0x25/0x70 fs/proc/base.c:1818
pid_revalidate+0x91/0x120 fs/proc/base.c:1841
d_revalidate fs/namei.c:758 [inline]
d_revalidate fs/namei.c:755 [inline]
lookup_fast+0x612/0x6c0 fs/namei.c:1618
do_last fs/namei.c:3291 [inline]
path_openat+0x2ac/0x3580 fs/namei.c:3537
do_filp_open+0x11e/0x1b0 fs/namei.c:3567
do_sys_open+0x3b3/0x4f0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x55/0x70 fs/open.c:1110
do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812b806828 of 2 bytes by task 11178 on cpu 0:
pid_update_inode+0x51/0x70 fs/proc/base.c:1820
pid_revalidate+0x91/0x120 fs/proc/base.c:1841
d_revalidate fs/namei.c:758 [inline]
d_revalidate fs/namei.c:755 [inline]
lookup_fast+0x612/0x6c0 fs/namei.c:1618
do_last fs/namei.c:3291 [inline]
path_openat+0x2ac/0x3580 fs/namei.c:3537
do_filp_open+0x11e/0x1b0 fs/namei.c:3567
do_sys_open+0x3b3/0x4f0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x55/0x70 fs/open.c:1110
do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11178 Comm: ps Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

\
 
 \ /
  Last update: 2020-01-07 09:17    [W:0.047 / U:39.712 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site