INFO: task syz-executor.2:6936 blocked for more than 143 seconds. Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:0 pid:6936 tgid:6935 ppid:6200 flags:0x0000000d Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5400 [inline] __schedule+0x1498/0x24b4 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xb8/0x19c kernel/sched/core.c:6817 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6874 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:684 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 bdev_release+0x100/0x870 block/bdev.c:969 blkdev_release+0x40/0x54 block/fops.c:631 __fput+0x30c/0x738 fs/file_table.c:376 ____fput+0x20/0x30 fs/file_table.c:404 task_work_run+0x230/0x2e0 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Showing all locks held in the system: 3 locks held by kworker/0:0/8: #0: ffff0000d1e9cd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff800093967c20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 #2: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 3 locks held by kworker/1:1/25: #0: ffff0000d1e9cd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff800093a87c20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 #2: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by khungtaskd/29: #0: ffff80008ee74ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:297 3 locks held by kworker/u4:7/261: 3 locks held by kworker/u4:11/696: 2 locks held by kworker/0:2/1695: #0: ffff0000c0022538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff80009b377c20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 3 locks held by kworker/1:2/5749: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff80009d137c20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 #2: ffff00018c3ca240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x270/0x32bc drivers/net/netdevsim/fib.c:1489 2 locks held by getty/5928: #0: ffff0000cbb1c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800094fe72f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201 1 lock held by udevd/6216: #0: ffff0000ca30e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open_by_dev+0x180/0x7ec block/bdev.c:859 2 locks held by kworker/1:5/6256: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff800097d77c20 (key_gc_work){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 3 locks held by kworker/1:6/6258: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff800097d97c20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 #2: ffff0000c5c92240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x270/0x32bc drivers/net/netdevsim/fib.c:1489 1 lock held by syz-executor.2/6936: #0: ffff0000ca30e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x100/0x870 block/bdev.c:969 1 lock held by syz-executor.2/8229: #0: ffff0000ca30e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open_by_dev+0x180/0x7ec block/bdev.c:859 5 locks held by kworker/u4:16/13386: #0: ffff0000c0023d38 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff800099c57c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 #2: ffff800091943350 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x8d0 net/core/net_namespace.c:580 #3: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 #4: ffff80008ee7a3f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #4: ffff80008ee7a3f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3ac/0x728 kernel/rcu/tree_exp.h:995 1 lock held by syz-executor.0/15132: #0: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x704/0xdbc net/core/rtnetlink.c:6614 1 lock held by syz-executor.2/15135: #0: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x704/0xdbc net/core/rtnetlink.c:6614 1 lock held by syz-executor.4/15147: #0: ffff80009194f2e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by syz-executor.3/15154: 4 locks held by syz-executor.1/15156: =============================================