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BUG: KCSAN: data-race in d_instantiate_new / other_inode_match

read to 0xffff8880b2cda600 of 8 bytes by task 14267 on cpu 0:
 other_inode_match+0x6b/0x5c0 fs/ext4/inode.c:5156
 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_dirty_inode+0x86/0xb0 fs/ext4/inode.c:6086
 __mark_inode_dirty+0x5d4/0x940 fs/fs-writeback.c:2258
 mark_inode_dirty include/linux/fs.h:2165 [inline]
 dquot_alloc_space include/linux/quotaops.h:308 [inline]
 dquot_alloc_block include/linux/quotaops.h:325 [inline]
 ext4_mb_new_blocks+0x2fa/0x1de0 fs/ext4/mballoc.c:4506
 ext4_alloc_branch fs/ext4/indirect.c:333 [inline]
 ext4_ind_map_blocks+0xe0b/0x17c0 fs/ext4/indirect.c:613
 ext4_map_blocks+0x660/0xfa0 fs/ext4/inode.c:642
 _ext4_get_block+0x12d/0x2b0 fs/ext4/inode.c:791
 ext4_get_block_trans+0xf4/0x1d0 fs/ext4/inode.c:852
 ext4_dio_get_block+0x6f/0xb0 fs/ext4/inode.c:869
 get_more_blocks fs/direct-io.c:709 [inline]
 do_direct_IO fs/direct-io.c:994 [inline]
 do_blockdev_direct_IO+0xed7/0x78c0 fs/direct-io.c:1326
 __blockdev_direct_IO+0x86/0xa0 fs/direct-io.c:1412
 ext4_direct_IO_write fs/ext4/inode.c:3742 [inline]
 ext4_direct_IO+0x76c/0xfb0 fs/ext4/inode.c:3871
 generic_file_direct_write+0x14d/0x2e0 mm/filemap.c:3208
 __generic_file_write_iter+0x17e/0x380 mm/filemap.c:3391
 ext4_file_write_iter+0x1bd/0xa00 fs/ext4/file.c:268
 call_write_iter include/linux/fs.h:1895 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880b2cda600 of 8 bytes by task 14296 on cpu 1:
 d_instantiate_new+0xb5/0x100 fs/dcache.c:1975
 ext4_add_nondir fs/ext4/namei.c:2556 [inline]
 ext4_add_nondir+0x91/0xa0 fs/ext4/namei.c:2550
 ext4_symlink+0x7c0/0x970 fs/ext4/namei.c:3331
 vfs_symlink fs/namei.c:4119 [inline]
 vfs_symlink+0x218/0x310 fs/namei.c:4105
 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4146
 __do_sys_symlink fs/namei.c:4165 [inline]
 __se_sys_symlink fs/namei.c:4163 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4163
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14296 Comm: syz-executor.1 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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