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

write to 0xffff888128fac2c0 of 8 bytes by task 7800 on cpu 1:
 __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
 touch_atime+0x13f/0x150 fs/inode.c:1765
 get_link fs/namei.c:1134 [inline]
 trailing_symlink+0x1ca/0x5a0 fs/namei.c:2381
 path_mountpoint.isra.0+0x132/0x250 fs/namei.c:2768
 filename_mountpoint+0x134/0x270 fs/namei.c:2792
 user_path_mountpoint_at+0x3f/0x60 fs/namei.c:2822
 ksys_umount+0xdc/0xae0 fs/namespace.c:1683
 __do_sys_umount fs/namespace.c:1709 [inline]
 __se_sys_umount fs/namespace.c:1707 [inline]
 __x64_sys_umount+0x35/0x50 fs/namespace.c:1707
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888128fac2c0 of 8 bytes by task 7815 on cpu 0:
 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_sync include/linux/fs.h:2188 [inline]
 dquot_free_space include/linux/quotaops.h:385 [inline]
 dquot_free_block include/linux/quotaops.h:395 [inline]
 ext4_free_blocks+0x12fe/0x1540 fs/ext4/mballoc.c:4931
 ext4_remove_blocks fs/ext4/extents.c:2646 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2812 [inline]
 ext4_ext_remove_space+0x1862/0x2bf0 fs/ext4/extents.c:3059
 ext4_ext_truncate+0x11a/0x120 fs/ext4/extents.c:4579
 ext4_truncate+0x5c8/0x9d0 fs/ext4/inode.c:4198
 ext4_evict_inode+0x5e6/0xa40 fs/ext4/inode.c:270
 evict+0x238/0x3f0 fs/inode.c:575
 iput_final fs/inode.c:1571 [inline]
 iput+0x36a/0x4d0 fs/inode.c:1597
 dentry_unlink_inode+0x272/0x2e0 fs/dcache.c:374
 d_delete fs/dcache.c:2451 [inline]
 d_delete+0xca/0xe0 fs/dcache.c:2440
 vfs_rmdir fs/namei.c:3966 [inline]
 vfs_rmdir+0x2d3/0x2f0 fs/namei.c:3931
 do_rmdir+0x2e9/0x320 fs/namei.c:4014
 __do_sys_rmdir fs/namei.c:4032 [inline]
 __se_sys_rmdir fs/namei.c:4030 [inline]
 __x64_sys_rmdir+0x2c/0x40 fs/namei.c:4030
 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: 0 PID: 7815 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================