Hello,
syzbot found the following issue on:
HEAD commit: 79b00034e9dc Merge tag 'drm-fixes-2022-03-11' of git://ano..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=10da9265700000
kernel config:
https://syzkaller.appspot.com/x/.config?x=5f8eb792c7b91c8f
dashboard link:
https://syzkaller.appspot.com/bug?extid=84b1b4b190aa2c4bc25a
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [
ak...@linux-foundation.org hu...@google.com linux-...@vger.kernel.org linu...@kvack.org]
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+84b1b4...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in generic_fillattr / shmem_mknod
write to 0xffff888104986418 of 8 bytes by task 3216 on cpu 0:
shmem_mknod+0xdc/0x170 mm/shmem.c:2825
shmem_create+0x2f/0x40 mm/shmem.c:2876
lookup_open fs/namei.c:3330 [inline]
open_last_lookups fs/namei.c:3400 [inline]
path_openat+0xc79/0x1f30 fs/namei.c:3606
do_filp_open+0x105/0x220 fs/namei.c:3636
do_sys_openat2+0xb5/0x2b0 fs/open.c:1214
do_sys_open fs/open.c:1230 [inline]
__do_sys_openat fs/open.c:1246 [inline]
__se_sys_openat fs/open.c:1241 [inline]
__x64_sys_openat+0xef/0x110 fs/open.c:1241
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
read to 0xffff888104986418 of 8 bytes by task 4790 on cpu 1:
i_size_read include/linux/fs.h:885 [inline]
generic_fillattr+0x203/0x2b0 fs/stat.c:53
vfs_getattr_nosec fs/stat.c:126 [inline]
vfs_getattr fs/stat.c:160 [inline]
vfs_statx+0x265/0x3c0 fs/stat.c:225
vfs_fstatat fs/stat.c:243 [inline]
__do_sys_newfstatat fs/stat.c:412 [inline]
__se_sys_newfstatat+0x63/0x260 fs/stat.c:406
__x64_sys_newfstatat+0x51/0x60 fs/stat.c:406
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
value changed: 0x0000000000001874 -> 0x0000000000001888
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4790 Comm: udevd Tainted: G W 5.17.0-rc7-syzkaller-00205-g79b00034e9dc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
---
This report 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
syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.