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

write to 0xffff8881065c5340 of 8 bytes by task 1778 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 0xffff8881065c5340 of 8 bytes by task 30812 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_ext_dirty fs/ext4/extents.c:169 [inline]
 ext4_ext_insert_extent+0x1385/0x2bc0 fs/ext4/extents.c:2130
 ext4_ext_map_blocks+0x167d/0x1f00 fs/ext4/extents.c:4259
 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638
 _ext4_get_block+0xf6/0x290 fs/ext4/inode.c:794
 ext4_get_block+0x35/0x40 fs/ext4/inode.c:811
 __block_write_begin_int+0x4a2/0x1060 fs/buffer.c:2031
 __block_write_begin+0x2b/0x40 fs/buffer.c:2081
 ext4_write_begin+0x41b/0xcc0 fs/ext4/ext4_jbd2.h:498
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3660
 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]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000014eaf78e -> 0x000000001b798c4d

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30812 Comm: syz-executor.1 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
syz-executor.1 (30812) used greatest stack depth: 9632 bytes left