==================================================================
BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time

write to 0xffff888106bb1630 of 8 bytes by task 1783 on cpu 0:
 __ext4_unlink+0x310/0x4c0 fs/ext4/namei.c:3366
 ext4_unlink+0x1eb/0x340 fs/ext4/namei.c:3401
 vfs_unlink+0x24a/0x400 fs/namei.c:4025
 do_unlinkat+0x238/0x4f0 fs/namei.c:4092
 __do_sys_unlink fs/namei.c:4139 [inline]
 __se_sys_unlink fs/namei.c:4137 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4137
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888106bb1630 of 8 bytes by task 21424 on cpu 1:
 ext4_encode_extra_time fs/ext4/ext4.h:887 [inline]
 __ext4_update_other_inode_time+0x18b/0x5c0 fs/ext4/inode.c:4974
 ext4_update_other_inodes_time fs/ext4/inode.c:5006 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5135 [inline]
 ext4_mark_iloc_dirty+0x12b6/0x1750 fs/ext4/inode.c:5724
 __ext4_mark_inode_dirty+0x4db/0x5b0 fs/ext4/inode.c:5918
 ext4_dirty_inode+0x86/0xa0 fs/ext4/inode.c:5947
 __mark_inode_dirty+0x77/0x6c0 fs/fs-writeback.c:2274
 mark_inode_dirty include/linux/fs.h:2404 [inline]
 generic_write_end+0x157/0x180 fs/buffer.c:2223
 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3110
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3671
 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21424 Comm: syz-executor.2 Tainted: G        W         5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================