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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

write to 0xffff888109e521b0 of 8 bytes by task 5916 on cpu 1:
 writeback_sb_inodes+0x2d7/0xaa0 fs/fs-writeback.c:1883
 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2070
 wb_do_writeback fs/fs-writeback.c:2217 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2257
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888109e521b0 of 8 bytes by task 6115 on cpu 0:
 __mark_inode_dirty+0x58/0x7d0 fs/fs-writeback.c:2412
 mark_inode_dirty_sync include/linux/fs.h:2159 [inline]
 dquot_free_space include/linux/quotaops.h:385 [inline]
 dquot_free_block include/linux/quotaops.h:395 [inline]
 ext4_mb_new_blocks+0x16a2/0x21e0 fs/ext4/mballoc.c:6290
 ext4_ext_map_blocks+0xe42/0x3630 fs/ext4/extents.c:4285
 ext4_map_blocks+0x704/0xf60 fs/ext4/inode.c:621
 ext4_alloc_file_blocks+0x278/0x6e0 fs/ext4/extents.c:4462
 ext4_fallocate+0x77e/0x11c0 fs/ext4/extents.c:4756
 vfs_fallocate+0x378/0x3e0 fs/open.c:324
 do_vfs_ioctl+0x12d7/0x1390 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x81/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000020007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6115 Comm: syz-executor.2 Not tainted 6.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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