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BUG: KCSAN: data-race in __mark_inode_dirty / other_inode_match

write to 0xffff8880b1fa3a70 of 8 bytes by task 10736 on cpu 0:
 other_inode_match fs/ext4/inode.c:4858 [inline]
 other_inode_match+0x13f/0x570 fs/ext4/inode.c:4842
 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_ext_tree_init+0x82/0x90 fs/ext4/extents.c:837
 __ext4_new_inode+0x2dbc/0x2f30 fs/ext4/ialloc.c:1167
 ext4_symlink+0x322/0x9e0 fs/ext4/namei.c:3287
 vfs_symlink fs/namei.c:4201 [inline]
 vfs_symlink+0x216/0x310 fs/namei.c:4187
 do_symlinkat+0x1ac/0x1e0 fs/namei.c:4228
 __do_sys_symlink fs/namei.c:4247 [inline]
 __se_sys_symlink fs/namei.c:4245 [inline]
 __x64_sys_symlink+0x3c/0x50 fs/namei.c:4245
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b1fa3a70 of 8 bytes by task 7877 on cpu 1:
 __mark_inode_dirty+0x4c8/0x940 fs/fs-writeback.c:2329
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7877 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
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