INFO: task kworker/1:1:8843 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:1 D26048 8843 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:697 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:692 usb_start_wait_urb+0x252/0x4c0 drivers/usb/core/message.c:63 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 usb_get_descriptor+0xc5/0x1b0 drivers/usb/core/message.c:654 usb_get_device_descriptor+0x81/0xf0 drivers/usb/core/message.c:926 hub_port_init+0x74b/0x3120 drivers/usb/core/hub.c:4799 hub_port_connect drivers/usb/core/hub.c:5070 [inline] hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] port_event drivers/usb/core/hub.c:5361 [inline] hub_event+0x1ccd/0x44a0 drivers/usb/core/hub.c:5441 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 000000005d2e6598 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7806: #0: 000000007803f7bc (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 5 locks held by kworker/1:1/8843: #0: 00000000f64ae1af ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000f4197f8b ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000ac2b77e2 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 00000000ac2b77e2 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 #3: 0000000015d3154c (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 0000000015d3154c (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 0000000015d3154c (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 0000000015d3154c (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 0000000015d3154c (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 00000000ee0717ba (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 2 locks held by syz-executor.1/27330: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 27330 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:write_comp_data+0x16/0x70 kernel/kcov.c:122 Code: 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 c0 df 01 00 65 8b 05 7a 59 9f 7e 00 01 1f 00 75 4f 8b 86 60 13 00 00 83 f8 03 75 44 48 8b 86 68 RSP: 0000:ffff8880ba107e60 EFLAGS: 00000046 RAX: 0000000080010001 RBX: 00000000009c09ed RCX: ffffffff815493bf RDX: 0000000000000000 RSI: ffff88809d80a500 RDI: 0000000000000007 RBP: fffffbfff13e3050 R08: ffffffff8c665058 R09: 0000000000000000 R10: 0000000000000007 R11: ffffffff8c66505b R12: dffffc0000000000 R13: 1ffffffff13e3052 R14: 00000000000a20e6 R15: 0000000000000000 FS: 00007efe38688700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe3b0b9b11 CR3: 0000000224327000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: clocksource_delta kernel/time/timekeeping_internal.h:25 [inline] timekeeping_get_delta kernel/time/timekeeping.c:269 [inline] timekeeping_get_ns kernel/time/timekeeping.c:373 [inline] ktime_get+0x1af/0x2f0 kernel/time/timekeeping.c:758 clockevents_program_event+0x141/0x350 kernel/time/clockevents.c:336 tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:48 hrtimer_interrupt+0x40a/0x9e0 kernel/time/hrtimer.c:1598 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 88 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d 7c 31 d8 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 fb eb e6 f8 eb c0 0f 0b 0f 0b 48 c7 c7 88 RSP: 0000:ffff88822cb6fbc8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffff8880b4f79c08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88809d80ac08 R14: 000000000000000a R15: 00007efe3b0b0ba0 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] force_sig_info+0x297/0x3b0 kernel/signal.c:1311 force_sig_info_fault.constprop.0+0x1e6/0x320 arch/x86/mm/fault.c:226 __bad_area_nosemaphore+0x2c1/0x400 arch/x86/mm/fault.c:910 __bad_area arch/x86/mm/fault.c:944 [inline] bad_area_access_error+0x25c/0x4a0 arch/x86/mm/fault.c:983 __do_page_fault+0xb09/0xd60 arch/x86/mm/fault.c:1392 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0033:0x7efe3b0b9452 Code: ff e8 62 33 01 00 85 c0 0f 84 ba 01 00 00 64 f0 83 2c 25 b8 ff ff ff 01 e8 6b d1 00 00 48 8b 0c 24 8b 00 48 8b 99 80 00 00 00 <89> 81 88 00 00 00 85 c0 75 06 48 83 fb ff 74 18 48 63 44 24 14 48 RSP: 002b:00007efe386881a0 EFLAGS: 00010203 RAX: 0000000000000000 RBX: 00000002be5741c3 RCX: 00007efe3b0b9a89 RDX: 00007efe3b0b942e RSI: 0000000000000001 RDI: 00007efe386885f0 RBP: 00007efe3b16cf6d R08: 00007efe386881a0 R09: 00007efe3b16cf6d R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe900e829f R14: 00007efe38688300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 39 d0 cmp %edx,%eax 2: 76 07 jbe 0xb 4: 48 89 34 d1 mov %rsi,(%rcx,%rdx,8) 8: 48 89 11 mov %rdx,(%rcx) b: c3 retq c: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 13: 00 14: 49 89 f1 mov %rsi,%r9 17: 49 89 fa mov %rdi,%r10 1a: 65 48 8b 34 25 c0 df mov %gs:0x1dfc0,%rsi 21: 01 00 23: 65 8b 05 7a 59 9f 7e mov %gs:0x7e9f597a(%rip),%eax # 0x7e9f59a4 * 2a: a9 00 01 1f 00 test $0x1f0100,%eax <-- trapping instruction 2f: 75 4f jne 0x80 31: 8b 86 60 13 00 00 mov 0x1360(%rsi),%eax 37: 83 f8 03 cmp $0x3,%eax 3a: 75 44 jne 0x80 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 86 .byte 0x86 3f: 68 .byte 0x68