==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

write to 0xffff888106aa5400 of 8 bytes by task 38 on cpu 0:
 writeback_sb_inodes+0x2da/0xad0 fs/fs-writeback.c:1905
 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2092
 wb_do_writeback fs/fs-writeback.c:2239 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243

read to 0xffff888106aa5400 of 8 bytes by task 3306 on cpu 1:
 __mark_inode_dirty+0x58/0x7d0 fs/fs-writeback.c:2434
 mark_inode_dirty include/linux/fs.h:2382 [inline]
 dquot_alloc_space include/linux/quotaops.h:319 [inline]
 dquot_alloc_block include/linux/quotaops.h:336 [inline]
 ext4_mb_new_blocks+0x1041/0x21e0 fs/ext4/mballoc.c:6169
 ext4_ext_map_blocks+0x10a1/0x33b0 fs/ext4/extents.c:4317
 ext4_map_blocks+0x72a/0xf50 fs/ext4/inode.c:623
 ext4_alloc_file_blocks+0x285/0x6f0 fs/ext4/extents.c:4494
 ext4_fallocate+0x77e/0x1180 fs/ext4/extents.c:4791
 vfs_fallocate+0x378/0x3e0 fs/open.c:328
 do_vfs_ioctl+0x12e6/0x13a0 fs/ioctl.c:850
 __do_sys_ioctl fs/ioctl.c:869 [inline]
 __se_sys_ioctl+0x81/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000020007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3306 Comm: syz-executor.4 Not tainted 6.8.0-rc5-syzkaller-00381-g70ff1fe626a1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================
syz-executor.4 (3306) used greatest stack depth: 11136 bytes left