Hello,
syzbot found the following issue on:
HEAD commit: ac3a0c84 Merge git://
git.kernel.org/pub/scm/linux/kernel/g..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=159030ec900000
kernel config:
https://syzkaller.appspot.com/x/.config?x=c9ef42681860b2c5
dashboard link:
https://syzkaller.appspot.com/bug?extid=9f01ba8f686219148901
compiler: clang version 11.0.0 (
https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
CC: [
linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+9f01ba...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in step_into / vfs_unlink
write to 0xffff88811e9e6cc0 of 4 bytes by task 21276 on cpu 0:
dont_mount include/linux/dcache.h:354 [inline]
vfs_unlink+0x26e/0x3d0 fs/namei.c:3827
do_unlinkat+0x28a/0x4d0 fs/namei.c:3889
__do_sys_unlink fs/namei.c:3936 [inline]
__se_sys_unlink fs/namei.c:3934 [inline]
__x64_sys_unlink+0x2c/0x30 fs/namei.c:3934
do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffff88811e9e6cc0 of 4 bytes by task 5040 on cpu 1:
__follow_mount_rcu fs/namei.c:1316 [inline]
handle_mounts fs/namei.c:1373 [inline]
step_into+0xec/0xe70 fs/namei.c:1690
walk_component+0x190/0x350 fs/namei.c:1866
lookup_last fs/namei.c:2309 [inline]
path_lookupat+0x12d/0x560 fs/namei.c:2333
filename_lookup+0xf2/0x380 fs/namei.c:2366
user_path_at_empty+0x3b/0x50 fs/namei.c:2646
do_readlinkat+0x87/0x200 fs/stat.c:419
__do_sys_readlink fs/stat.c:452 [inline]
__se_sys_readlink fs/stat.c:449 [inline]
__x64_sys_readlink+0x43/0x50 fs/stat.c:449
do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5040 Comm: systemd-udevd Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
---
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