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BUG: KCSAN: data-race in __mark_inode_dirty / other_inode_match

write to 0xffff8880ba808c20 of 8 bytes by task 8073 on cpu 0:
 other_inode_match fs/ext4/inode.c:5165 [inline]
 other_inode_match+0x13c/0x5c0 fs/ext4/inode.c:5149
 find_inode_nowait+0x135/0x160 fs/inode.c:1437
 ext4_update_other_inodes_time fs/ext4/inode.c:5204 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5330 [inline]
 ext4_mark_iloc_dirty+0x12a8/0x1580 fs/ext4/inode.c:5876
 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:6055
 ext4_rmdir fs/ext4/namei.c:3117 [inline]
 ext4_rmdir+0x54b/0x6e0 fs/ext4/namei.c:3053
 vfs_rmdir fs/namei.c:3870 [inline]
 vfs_rmdir+0x119/0x300 fs/namei.c:3849
 do_rmdir+0x2cb/0x300 fs/namei.c:3932
 __do_sys_rmdir fs/namei.c:3950 [inline]
 __se_sys_rmdir fs/namei.c:3948 [inline]
 __x64_sys_rmdir+0x2f/0x40 fs/namei.c:3948
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880ba808c20 of 8 bytes by task 8052 on cpu 1:
 __mark_inode_dirty+0x4e4/0x940 fs/fs-writeback.c:2326
 mark_buffer_dirty+0x29c/0x2c0 fs/buffer.c:1116
 __block_commit_write.isra.0+0x11f/0x170 fs/buffer.c:2041
 block_commit_write fs/buffer.c:2433 [inline]
 block_page_mkwrite+0x226/0x230 fs/buffer.c:2482
 ext4_page_mkwrite+0x5af/0xce0 fs/ext4/inode.c:6217
 do_page_mkwrite+0x100/0x210 mm/memory.c:2208
 wp_page_shared mm/memory.c:2507 [inline]
 do_wp_page+0xd65/0x11f0 mm/memory.c:2619
 handle_pte_fault mm/memory.c:3865 [inline]
 __handle_mm_fault+0x1ab1/0x2c70 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8052 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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