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BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_free_blocks

write to 0xffff88810232c884 of 4 bytes by task 31759 on cpu 0:
 mb_free_blocks+0x156/0xb60 fs/ext4/mballoc.c:1464
 ext4_mb_release_inode_pa+0x2d6/0x5b0 fs/ext4/mballoc.c:4162
 ext4_mb_discard_group_preallocations+0x697/0xa60 fs/ext4/mballoc.c:4291
 ext4_mb_discard_preallocations+0x6e/0x160 fs/ext4/mballoc.c:4858
 ext4_mb_discard_preallocations_should_retry fs/ext4/mballoc.c:4873 [inline]
 ext4_mb_new_blocks+0xe28/0x1150 fs/ext4/mballoc.c:5009
 ext4_ext_map_blocks+0x146f/0x1fd0 fs/ext4/extents.c:4238
 ext4_map_blocks+0x726/0xff0 fs/ext4/inode.c:638
 ext4_iomap_alloc fs/ext4/inode.c:3428 [inline]
 ext4_iomap_begin+0x513/0x6a0 fs/ext4/inode.c:3478
 iomap_apply+0x8d/0x4a0 fs/iomap/apply.c:46
 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xe5d/0x10b0 fs/ext4/file.c:661
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810232c884 of 4 bytes by task 31767 on cpu 1:
 ext4_mb_find_by_goal+0x129/0xb40 fs/ext4/mballoc.c:1866
 ext4_mb_regular_allocator+0x110/0x1900 fs/ext4/mballoc.c:2297
 ext4_mb_new_blocks+0x6f8/0x1150 fs/ext4/mballoc.c:4982
 ext4_ext_map_blocks+0x146f/0x1fd0 fs/ext4/extents.c:4238
 ext4_map_blocks+0x726/0xff0 fs/ext4/inode.c:638
 ext4_iomap_alloc fs/ext4/inode.c:3428 [inline]
 ext4_iomap_begin+0x513/0x6a0 fs/ext4/inode.c:3478
 iomap_apply+0x8d/0x4a0 fs/iomap/apply.c:46
 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xe5d/0x10b0 fs/ext4/file.c:661
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31767 Comm: syz-executor.1 Not tainted 5.12.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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