INFO: task syz-executor.3:4418 blocked for more than 143 seconds. Not tainted 5.15.153-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack: 0 pid: 4418 ppid: 3977 flags:0x0000000d Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_timeout+0xb8/0x344 kernel/time/timer.c:1860 do_wait_for_common+0x214/0x388 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x4c/0x64 kernel/sched/completion.c:138 flush_workqueue+0x580/0x11c4 kernel/workqueue.c:2882 nbd_start_device_ioctl drivers/block/nbd.c:1365 [inline] __nbd_ioctl drivers/block/nbd.c:1427 [inline] nbd_ioctl+0x8c8/0xc2c drivers/block/nbd.c:1467 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:604 block_ioctl+0xa8/0x114 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Showing all locks held in the system: 4 locks held by kworker/u4:0/9: 3 locks held by kworker/0:1/13: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff800018957c00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff0000d5b0c240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x274/0x33c4 drivers/net/netdevsim/fib.c:1478 1 lock held by khungtaskd/27: #0: ffff800014ae14a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 3 locks held by kworker/u4:2/148: 2 locks held by kworker/u4:3/285: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff0001b47f3c48 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x438/0x66c kernel/sched/psi.c:891 2 locks held by getty/3728: #0: ffff0000d2d93098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001a39b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158 1 lock held by syz-executor.0/3978: #0: ffff800014ae5aa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #0: ffff800014ae5aa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x320/0x660 kernel/rcu/tree_exp.h:845 2 locks held by kworker/u5:2/3984: #0: ffff0000cc2d9938 ((wq_completion)nbd3-recv){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001cdd7c00 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 2 locks held by kworker/0:5/4023: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001d167c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 3 locks held by kworker/0:15/5997: #0: ffff0001b4806918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:475 [inline] #0: ffff0001b4806918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] #0: ffff0001b4806918 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1621 [inline] #0: ffff0001b4806918 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x328/0x1e48 kernel/sched/core.c:6290 #1: ffff0001b47f3c48 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x438/0x66c kernel/sched/psi.c:891 #2: ffff0001b47f4498 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x108/0x214 kernel/time/timer.c:946 2 locks held by udevd/7432: 2 locks held by syz-executor.4/7519: 1 lock held by syz-executor.1/7790: #0: ffff0000c18272b8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nf_tables_valid_genid+0x3c/0xd4 net/netfilter/nf_tables_api.c:9896 2 locks held by syz-executor.3/7803: #0: ffff0000cbee9118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe0/0x6b0 block/bdev.c:912 #1: ffff0000cbe36468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x58/0x210 drivers/block/loop.c:2070 2 locks held by syz-executor.2/7802: #0: ffff0000dc1a1410 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #0: ffff0000dc1a1410 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:648 [inline] #0: ffff0000dc1a1410 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x80/0x1fc net/socket.c:1336 #1: ffff0000cd79e520 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1668 [inline] #1: ffff0000cd79e520 (sk_lock-AF_PHONET){+.+.}-{0:0}, at: pep_sock_unhash+0x38/0x320 net/phonet/pep.c:1302 1 lock held by rm/7808: =============================================