linux-kernel - KCSAN: data-race in pid_update_inode / pid_update

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Message-ID: <000000000000004d9d059b88678a@google.com>
Date:   Tue, 07 Jan 2020 00:17:09 -0800
From:   syzbot <syzbot+41a393c8d33874c463e9@...kaller.appspotmail.com>
To:     adobriyan@...il.com, akpm@...ux-foundation.org,
        casey@...aufler-ca.com, christian@...uner.io, elver@...gle.com,
        keescook@...omium.org, kent.overstreet@...il.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mhocko@...e.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: KCSAN: data-race in pid_update_inode / pid_update_inode

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@...kaller.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
==================================================================


---
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