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BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty

read-write to 0xffff8881290d8690 of 8 bytes by task 4480 on cpu 0:
 __mark_inode_dirty+0x1ed/0x5f0 fs/fs-writeback.c:2403
 mark_buffer_dirty+0x176/0x390 fs/buffer.c:1109
 __block_commit_write fs/buffer.c:2080 [inline]
 block_write_end+0x13d/0x240 fs/buffer.c:2159
 generic_write_end+0x5d/0x230 fs/buffer.c:2173
 ext4_da_write_end+0x26c/0x620 fs/ext4/inode.c:3068
 generic_perform_write+0x26a/0x3f0 mm/filemap.c:3798
 ext4_buffered_write_iter+0x222/0x330 fs/ext4/file.c:270
 ext4_file_write_iter+0x2e3/0x1210
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0x71c/0x890 fs/read_write.c:591
 ksys_write+0xe8/0x1a0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:653
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881290d8690 of 8 bytes by task 2940 on cpu 1:
 __mark_inode_dirty+0xd5/0x5f0 fs/fs-writeback.c:2388
 mark_inode_dirty_sync include/linux/fs.h:2329 [inline]
 dquot_free_space include/linux/quotaops.h:382 [inline]
 dquot_free_block include/linux/quotaops.h:392 [inline]
 ext4_mb_clear_bb+0xdc8/0x11f0 fs/ext4/mballoc.c:6042
 ext4_free_blocks+0x736/0x840 fs/ext4/mballoc.c:6164
 ext4_ext_try_to_merge_up fs/ext4/extents.c:1872 [inline]
 ext4_ext_try_to_merge+0x2fa/0x310 fs/ext4/extents.c:1899
 ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3764 [inline]
 ext4_ext_handle_unwritten_extents+0x678/0xb20 fs/ext4/extents.c:3892
 ext4_ext_map_blocks+0x73a/0x1bb0 fs/ext4/extents.c:4162
 ext4_map_blocks+0x75b/0xfc0 fs/ext4/inode.c:636
 ext4_convert_unwritten_extents+0x17a/0x2e0 fs/ext4/extents.c:4805
 ext4_convert_unwritten_io_end_vec+0xa4/0x130 fs/ext4/extents.c:4844
 ext4_end_io_end fs/ext4/page-io.c:186 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x1b0/0x3a0 fs/ext4/page-io.c:273
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000000 -> 0x0000000000000007

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2940 Comm: kworker/u4:20 Tainted: G        W         5.18.0-rc6-syzkaller-00009-gfeb9c5e19e91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
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