INFO: task syz-executor.1:17222 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:26744 pid:17222 ppid: 8525 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:731 [inline] usbdev_open+0x19d/0x930 drivers/usb/core/devio.c:1029 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4179b1 RSP: 002b:00007fac1b101820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004179b1 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fac1b101850 RBP: 000000000119bf60 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000119bf2c R13: 00007ffd40a61f2f R14: 00007fac1b1029c0 R15: 000000000119bf2c INFO: task syz-executor.1:17222 blocked for more than 143 seconds. Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26744 pid:17222 ppid: 8525 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:731 [inline] usbdev_open+0x19d/0x930 drivers/usb/core/devio.c:1029 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4179b1 RSP: 002b:00007fac1b101820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004179b1 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fac1b101850 RBP: 000000000119bf60 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000119bf2c R13: 00007ffd40a61f2f R14: 00007fac1b1029c0 R15: 000000000119bf2c Showing all locks held in the system: 2 locks held by kworker/u4:4/154: #0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x789/0xe50 kernel/sched/fair.c:10641 #1: ffff8880b9f20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 1 lock held by khungtaskd/1635: #0: ffffffff8b33a7a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 3 locks held by in:imklog/8197: 5 locks held by kworker/0:4/8195: #0: ffff888014ca5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888014ca5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888014ca5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888014ca5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888014ca5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888014ca5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2243 #1: ffffc900012efda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2247 #2: ffff88801bfb6218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff88801bfb6218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42d0 drivers/usb/core/hub.c:5537 #3: ffff88807bd32588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3030 [inline] #3: ffff88807bd32588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5154 [inline] #3: ffff88807bd32588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] #3: ffff88807bd32588 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5509 [inline] #3: ffff88807bd32588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x216c/0x42d0 drivers/usb/core/hub.c:5591 #4: ffff888144cb4a68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1b2/0x2dd0 drivers/usb/core/hub.c:4582 1 lock held by syz-executor.1/17222: #0: ffff88801bfb6218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #0: ffff88801bfb6218 (&dev->mutex){....}-{3:3}, at: usbdev_open+0x19d/0x930 drivers/usb/core/devio.c:1029 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1635 Comm: khungtaskd Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4881 Comm: systemd-journal Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__this_cpu_preempt_check+0xd/0x20 lib/smp_processor_id.c:70 Code: 00 00 48 c7 c6 00 39 9e 89 48 c7 c7 40 39 9e 89 e9 98 fe ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 0f 1f 44 00 00 48 89 ee 5d <48> c7 c7 80 39 9e 89 e9 77 fe ff ff cc cc cc cc cc cc cc eb 1e 0f RSP: 0018:ffffc900014efe20 EFLAGS: 00000086 RAX: 0000000000000001 RBX: 1ffff9200029dfc7 RCX: 0000000000000001 RDX: 1ffff1100463bb35 RSI: ffffffff894b6f20 RDI: ffffffff894b6f20 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ebd3767 R10: fffffbfff1d7a6ec R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff8b33a7a0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f332a81d8c0(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3327da6028 CR3: 000000002478a000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:437 [inline] lock_acquire kernel/locking/lockdep.c:5439 [inline] lock_acquire+0x2ad/0x740 kernel/locking/lockdep.c:5402 rcu_lock_acquire include/linux/rcupdate.h:255 [inline] rcu_read_lock include/linux/rcupdate.h:644 [inline] __task_pid_nr_ns+0x3d/0x4b0 kernel/pid.c:497 task_tgid_vnr include/linux/sched.h:1476 [inline] __do_sys_getpid+0x1a/0x20 kernel/sys.c:907 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f3329ab6f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007fff7eeb5fb8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 0000563f57ffa1e0 RCX: 00007f3329ab6f17 RDX: 00007fff7eeb6070 RSI: 0000000000000000 RDI: 0000563f57ffa1e0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007fff7eeb6070 R13: 0000000000001311 R14: 00007fff7eeb8e60 R15: 00007fff7eeb6470