syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / move_expired_inodes

read-write to 0xffff888105572d10 of 4 bytes by task 31 on cpu 1:
 move_expired_inodes+0x17a/0x400 fs/fs-writeback.c:1496
 queue_io+0xd9/0x2c0 fs/fs-writeback.c:1548
 wb_writeback+0x226/0x5c0 fs/fs-writeback.c:2191
 wb_do_writeback fs/fs-writeback.c:2342 [inline]
 wb_workfn+0x194/0x910 fs/fs-writeback.c:2382
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x486/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888105572d10 of 4 bytes by task 6872 on cpu 0:
 __mark_inode_dirty+0x191/0x750 fs/fs-writeback.c:2588
 mark_buffer_dirty+0x133/0x210 fs/buffer.c:1209
 block_commit_write fs/buffer.c:2218 [inline]
 block_page_mkwrite+0x287/0x3d0 fs/buffer.c:2643
 ext4_page_mkwrite+0x859/0xb90 fs/ext4/inode.c:6696
 do_page_mkwrite mm/memory.c:3488 [inline]
 wp_page_shared mm/memory.c:3889 [inline]
 do_wp_page+0xa77/0x2510 mm/memory.c:4108
 handle_pte_fault mm/memory.c:6193 [inline]
 __handle_mm_fault mm/memory.c:6318 [inline]
 handle_mm_fault+0x77d/0x2be0 mm/memory.c:6487
 do_user_addr_fault+0x630/0x1080 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00000050 -> 0x00020052

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 6872 Comm: syz.0.1323 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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