syzbot

INFO: task syz-executor:6552 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:6552  tgid:6552  ppid:6547   task_flags:0x400140 flags:0x00000018
Call trace:
 __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T)
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x13b0/0x2864 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:7026
 xlog_wait+0x114/0x1a4 fs/xfs/xfs_log_priv.h:588
 xlog_wait_on_iclog+0x2f8/0x56c fs/xfs/xfs_log.c:841
 xfs_log_force+0x478/0x94c fs/xfs/xfs_log.c:2947
 xfs_fs_sync_fs+0x120/0x400 fs/xfs/xfs_super.c:844
 sync_filesystem+0x1a0/0x218 fs/sync.c:66
 generic_shutdown_super+0x70/0x2b8 fs/super.c:621
 kill_block_super+0x44/0x90 fs/super.c:1722
 xfs_kill_sb+0x20/0x58 fs/xfs/xfs_super.c:2294
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334
 task_work_run+0x1dc/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline]
 el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Showing all locks held in the system:
1 lock held by kthreadd/2:
2 locks held by kworker/0:1/11:
3 locks held by kworker/u8:0/12:
3 locks held by kworker/u8:1/15:
3 locks held by kworker/1:0/24:
 #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237
 #1: ffff800097b27be0 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237
 #2: ffff8000928577a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
4 locks held by kworker/1:1/26:
1 lock held by khungtaskd/32:
 #0: ffff80008f76b660 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
3 locks held by kworker/u8:2/41:
3 locks held by kworker/u8:3/42:
3 locks held by kworker/u8:4/861:
2 locks held by kworker/u8:5/1349:
4 locks held by kworker/1:2/1833:
2 locks held by kworker/1:1H/2023:
 #0: ffff0000c1c87548 ((wq_completion)kblockd){+.+.}-{0:0}