==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / other_inode_match

write to 0xffff888129b3c3c0 of 8 bytes by task 27030 on cpu 0:
 __mark_inode_dirty+0x1c1/0x940 fs/fs-writeback.c:2289
 generic_update_time+0x184/0x270 fs/inode.c:1681
 update_time+0x7d/0x90 fs/inode.c:1694
 file_update_time+0x205/0x2d0 fs/inode.c:1909
 file_modified fs/inode.c:1932 [inline]
 file_modified+0x60/0x80 fs/inode.c:1917
 ext4_write_checks+0x4a/0x70 fs/ext4/file.c:249
 ext4_buffered_write_iter+0x87/0x280 fs/ext4/file.c:265
 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x303/0x400 fs/read_write.c:483
 __vfs_write+0x9e/0xb0 fs/read_write.c:496
 __kernel_write+0xb0/0x230 fs/read_write.c:515
 do_acct_process+0x94f/0xb00 kernel/acct.c:522
 slow_acct_process kernel/acct.c:581 [inline]
 acct_process+0x1c1/0x1d8 kernel/acct.c:607
 do_exit+0x10e5/0x1880 kernel/exit.c:791
 do_group_exit+0xae/0x1a0 kernel/exit.c:899
 get_signal+0x2a7/0x1290 kernel/signal.c:2734
 do_signal+0x2b/0x670 arch/x86/kernel/signal.c:813
 exit_to_usermode_loop+0x24a/0x2c0 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888129b3c3c0 of 8 bytes by task 7735 on cpu 1:
 other_inode_match+0x6a/0x570 fs/ext4/inode.c:4849
 find_inode_nowait+0x12f/0x160 fs/inode.c:1445
 ext4_update_other_inodes_time fs/ext4/inode.c:4897 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5023 [inline]
 ext4_mark_iloc_dirty+0x123c/0x1500 fs/ext4/inode.c:5578
 ext4_mark_inode_dirty+0xe6/0x420 fs/ext4/inode.c:5771
 ext4_dirty_inode+0xad/0xd0 fs/ext4/inode.c:5802
 __mark_inode_dirty+0x5b7/0x940 fs/fs-writeback.c:2258
 mark_inode_dirty include/linux/fs.h:2183 [inline]
 dquot_alloc_space include/linux/quotaops.h:320 [inline]
 dquot_alloc_block include/linux/quotaops.h:337 [inline]
 ext4_mb_new_blocks+0x2fd/0x1ea0 fs/ext4/mballoc.c:4510
 ext4_ext_map_blocks+0x1a5c/0x20f0 fs/ext4/extents.c:4440
 ext4_map_blocks+0x230/0xcf0 fs/ext4/inode.c:622
 ext4_getblk+0x82/0x380 fs/ext4/inode.c:826
 ext4_bread+0x47/0x200 fs/ext4/inode.c:876
 ext4_append+0xc0/0x1e0 fs/ext4/namei.c:67
 ext4_init_new_dir fs/ext4/namei.c:2747 [inline]
 ext4_mkdir+0x401/0x820 fs/ext4/namei.c:2792
 vfs_mkdir+0x281/0x390 fs/namei.c:3889
 do_mkdirat+0x1b5/0x200 fs/namei.c:3912
 __do_sys_mkdir fs/namei.c:3928 [inline]
 __se_sys_mkdir fs/namei.c:3926 [inline]
 __x64_sys_mkdir+0x3d/0x50 fs/namei.c:3926
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7735 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================