KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f80ef9e49fdf Merge tag 'docs-5.16-3' of git://git.lwn.net/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12fb9da9b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9a2598dd2cfceb9b
dashboard link: https://syzkaller.appspot.com/bug?extid=8fb4eddf5f093921f34d
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [adilger...@dilger.ca linux...@vger.kernel.org linux-...@vger.kernel.org ty...@mit.edu]

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+8fb4ed...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del

write to 0xffff888118fd1a5c of 4 bytes by task 1833 on cpu 1:
ext4_orphan_del+0x579/0x730 fs/ext4/orphan.c:296
ext4_evict_inode+0xb9f/0xf10 fs/ext4/inode.c:318
evict+0x1aa/0x410 fs/inode.c:590
iput_final fs/inode.c:1670 [inline]
iput+0x3ef/0x580 fs/inode.c:1696
dentry_unlink_inode+0x23d/0x250 fs/dcache.c:376
d_delete+0x78/0xa0 fs/dcache.c:2505
vfs_rmdir+0x2bf/0x2e0 fs/namei.c:3982
do_rmdir+0x18d/0x330 fs/namei.c:4030
__do_sys_rmdir fs/namei.c:4049 [inline]
__se_sys_rmdir fs/namei.c:4047 [inline]
__x64_sys_rmdir+0x2c/0x30 fs/namei.c:4047
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 0xffff888118fd1a5c of 4 bytes by task 1827 on cpu 0:
ext4_fill_raw_inode+0x68c/0xea0 fs/ext4/inode.c:4331
ext4_do_update_inode fs/ext4/inode.c:5094 [inline]
ext4_mark_iloc_dirty+0x364/0x890 fs/ext4/inode.c:5694
__ext4_mark_inode_dirty+0x4ec/0x5f0 fs/ext4/inode.c:5890
ext4_evict_inode+0x9ae/0xf10 fs/ext4/inode.c:280
evict+0x1aa/0x410 fs/inode.c:590
iput_final fs/inode.c:1670 [inline]
iput+0x3ef/0x580 fs/inode.c:1696
dentry_unlink_inode+0x23d/0x250 fs/dcache.c:376
d_delete+0x78/0xa0 fs/dcache.c:2505
vfs_rmdir+0x2bf/0x2e0 fs/namei.c:3982
do_rmdir+0x18d/0x330 fs/namei.c:4030
__do_sys_rmdir fs/namei.c:4049 [inline]
__se_sys_rmdir fs/namei.c:4047 [inline]
__x64_sys_rmdir+0x2c/0x30 fs/namei.c:4047
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: 0x00000532 -> 0x00000514

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1827 Comm: syz-executor.0 Tainted: G W 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.