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BUG: KCSAN: data-race in __ext4_update_other_inode_time / ext4_unlink

write to 0xffff8880a676e870 of 8 bytes by task 23863 on cpu 0:
 ext4_unlink+0x7b4/0x9e0 fs/ext4/namei.c:3251
 vfs_unlink+0x232/0x3c0 fs/namei.c:3832
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3896
 __do_sys_unlink fs/namei.c:3942 [inline]
 __se_sys_unlink fs/namei.c:3940 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a676e870 of 8 bytes by task 25345 on cpu 1:
 ext4_encode_extra_time fs/ext4/ext4.h:882 [inline]
 __ext4_update_other_inode_time+0x14f/0x570 fs/ext4/inode.c:4908
 ext4_update_other_inodes_time fs/ext4/inode.c:4940 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5068 [inline]
 ext4_mark_iloc_dirty+0x1296/0x1660 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818
 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5854
 __mark_inode_dirty+0x72/0x7f0 fs/fs-writeback.c:2260
 mark_inode_dirty include/linux/fs.h:2169 [inline]
 dquot_alloc_space include/linux/quotaops.h:320 [inline]
 dquot_alloc_block include/linux/quotaops.h:337 [inline]
 ext4_mb_new_blocks+0x7c8/0xcf0 fs/ext4/mballoc.c:4882
 ext4_ext_map_blocks+0x164e/0x20c0 fs/ext4/extents.c:4238
 ext4_map_blocks+0x6bf/0xf40 fs/ext4/inode.c:625
 ext4_iomap_alloc fs/ext4/inode.c:3401 [inline]
 ext4_iomap_begin+0x46e/0x5f0 fs/ext4/inode.c:3440
 iomap_apply+0x8b/0x540 fs/iomap/apply.c:46
 iomap_dio_rw+0x434/0x980 fs/iomap/direct-io.c:506
 ext4_dio_write_iter fs/ext4/file.c:548 [inline]
 ext4_file_write_iter+0xdd5/0x1060 fs/ext4/file.c:658
 call_write_iter include/linux/fs.h:1882 [inline]
 do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:721
 do_iter_write+0x112/0x4b0 fs/read_write.c:1026
 vfs_iter_write+0x4c/0x70 fs/read_write.c:1067
 iter_file_splice_write+0x41a/0x770 fs/splice.c:770
 do_splice_from fs/splice.c:866 [inline]
 direct_splice_actor+0x95/0x160 fs/splice.c:1036
 splice_direct_to_actor+0x365/0x660 fs/splice.c:991
 do_splice_direct+0xf2/0x170 fs/splice.c:1079
 do_sendfile+0x56a/0xba0 fs/read_write.c:1548
 __do_sys_sendfile64 fs/read_write.c:1609 [inline]
 __se_sys_sendfile64 fs/read_write.c:1595 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1595
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25345 Comm: syz-executor.5 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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