EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)!
EXT4-fs (loop5): group descriptors corrupted!
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BUG: KCSAN: data-race in __flush_work / wq_worker_running

read-write to 0xffff888237c2a860 of 4 bytes by task 10353 on cpu 0:
 wq_worker_running+0x96/0xe0 kernel/workqueue.c:880
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:1935
 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:571 [inline]
 synchronize_rcu_expedited_wait+0x22a/0xca0 kernel/rcu/tree_exp.h:622
 rcu_exp_wait_wake kernel/rcu/tree_exp.h:688 [inline]
 rcu_exp_sel_wait_wake+0x355/0x730 kernel/rcu/tree_exp.h:722
 wait_rcu_exp_gp+0x1a/0x20 kernel/rcu/tree_exp.h:512
 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

read to 0xffff888237c2a860 of 4 bytes by task 11013 on cpu 1:
 __need_more_worker kernel/workqueue.c:785 [inline]
 insert_work kernel/workqueue.c:1365 [inline]
 insert_wq_barrier kernel/workqueue.c:2716 [inline]
 start_flush_work kernel/workqueue.c:3034 [inline]
 __flush_work+0x416/0x520 kernel/workqueue.c:3074
 flush_work+0x13/0x20 kernel/workqueue.c:3096
 __lru_add_drain_all+0x412/0x450 mm/swap.c:875
 lru_add_drain_all+0xc/0x10 mm/swap.c:883
 invalidate_bdev+0x56/0x80 block/bdev.c:85
 invalidate_disk+0x25/0xb0 block/genhd.c:672
 __loop_clr_fd+0x176/0x3c0 drivers/block/loop.c:1164
 loop_clr_fd drivers/block/loop.c:1257 [inline]
 lo_ioctl+0xd8c/0x1290 drivers/block/loop.c:1563
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 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+0x63/0xcd

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11013 Comm: syz-executor.5 Not tainted 6.0.0-rc2-syzkaller-00327-g8379c0b31fbc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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