kworker/u4:5: attempt to access beyond end of device
loop4: rw=1, sector=1824, nr_sectors = 8 limit=256
==================================================================
BUG: KCSAN: data-race in write_cache_pages / write_cache_pages

write to 0xffff8881023ecc90 of 8 bytes by task 3125 on cpu 1:
 write_cache_pages+0xa4e/0xaa0 mm/page-writeback.c:2523
 generic_writepages mm/page-writeback.c:2563 [inline]
 do_writepages+0x211/0x330 mm/page-writeback.c:2583
 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 __filemap_fdatawrite mm/filemap.c:427 [inline]
 filemap_flush+0x95/0xc0 mm/filemap.c:454
 sync_blockdev_nowait+0x36/0x50 block/bdev.c:186
 sync_filesystem+0xe0/0x180 fs/sync.c:60
 generic_shutdown_super+0x40/0x240 fs/super.c:474
 kill_block_super+0x4e/0xa0 fs/super.c:1386
 deactivate_locked_super+0x6b/0xd0 fs/super.c:332
 deactivate_super+0x9b/0xb0 fs/super.c:363
 cleanup_mnt+0x23e/0x2a0 fs/namespace.c:1291
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1298
 task_work_run+0x123/0x160 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff8881023ecc90 of 8 bytes by task 3141 on cpu 0:
 write_cache_pages+0xa4e/0xaa0 mm/page-writeback.c:2523
 generic_writepages mm/page-writeback.c:2563 [inline]
 do_writepages+0x211/0x330 mm/page-writeback.c:2583
 __writeback_single_inode+0x91/0x860 fs/fs-writeback.c:1598
 writeback_sb_inodes+0x515/0xaa0 fs/fs-writeback.c:1889
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:1960
 wb_writeback+0x24d/0x6c0 fs/fs-writeback.c:2065
 wb_check_background_flush fs/fs-writeback.c:2131 [inline]
 wb_do_writeback fs/fs-writeback.c:2219 [inline]
 wb_workfn+0x67f/0x8d0 fs/fs-writeback.c:2246
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2289
 worker_thread+0x5ef/0xa10 kernel/workqueue.c:2436
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x0000000000000000 -> 0x0000000000000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3141 Comm: kworker/u4:5 Not tainted 6.2.0-rc7-syzkaller-00018-g0983f6bf2bfc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: writeback wb_workfn (flush-7:4)
==================================================================
kworker/u4:5: attempt to access beyond end of device
loop1: rw=1, sector=1824, nr_sectors = 8 limit=256