INFO: task kworker/1:2:3570 blocked for more than 140 seconds. NILFS (loop5): couldn't find nilfs on the device Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. NILFS (loop5): couldn't find nilfs on the device kworker/1:2 D25784 3570 2 0x80000000 Workqueue: usb_hub_wq hub_event NILFS (loop1): couldn't find nilfs on the device Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 NILFS (loop1): couldn't find nilfs on the device schedule+0x8d/0x1b0 kernel/sched/core.c:3561 usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:697 NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024) usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:692 NILFS (loop3): mounting unchecked fs usb_start_wait_urb+0x252/0x4c0 drivers/usb/core/message.c:63 NILFS (loop3): invalid segment: Checksum error in segment payload NILFS (loop3): unable to fall back to spare super block NILFS (loop3): error -22 while searching super root 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 NILFS (loop5): couldn't find nilfs on the device process_one_work+0x864/0x1570 kernel/workqueue.c:2153 NILFS (loop5): couldn't find nilfs on the device worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 NILFS (loop1): couldn't find nilfs on the device ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000250224fb (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 NILFS (loop1): couldn't find nilfs on the device 5 locks held by kworker/1:2/3570: #0: 000000001edbc0c6 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000003bb7e9f4 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024) #2: 00000000361a5a20 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 00000000361a5a20 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 NILFS (loop3): mounting unchecked fs #3: 00000000252bca92 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 00000000252bca92 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 00000000252bca92 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 00000000252bca92 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 00000000252bca92 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 NILFS (loop3): invalid segment: Checksum error in segment payload #4: 00000000e9d43879 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 1 lock held by systemd-udevd/4700: NILFS (loop3): unable to fall back to spare super block 1 lock held by in:imklog/7806: #0: 00000000ec309452 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 NILFS (loop3): error -22 while searching super root 3 locks held by syz-executor.1/8113: #0: 0000000058ad9d67 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 0000000058ad9d67 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000250224fb (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000250224fb (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 #2: 00000000250224fb (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #2: 00000000250224fb (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 1 lock held by syz-executor.3/8117: NILFS (loop5): couldn't find nilfs on the device 2 locks held by kworker/u4:6/9385: 1 lock held by syz-executor.5/656: 1 lock held by syz-executor.4/662: NILFS (loop5): couldn't find nilfs on the device 2 locks held by syz-executor.1/660: NILFS (loop1): couldn't find nilfs on the device 3 locks held by syz-executor.0/665: 2 locks held by syz-executor.3/669: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4683 Comm: systemd-journal 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:__sanitizer_cov_trace_pc+0x14/0x50 kernel/kcov.c:101 Code: 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e <81> e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 83 fa 02 75 20 48 8b 88 RSP: 0018:ffff8880a16ffa00 EFLAGS: 00000002 RAX: ffff8880a16f0340 RBX: 1ffff110142dff42 RCX: 0000000000000000 RDX: 0000000080000002 RSI: ffffffff816a2702 RDI: ffff8880a16f06b0 RBP: ffffc90005c38000 R08: 0000000000000000 R09: 0000000000000001 R10: ffff8880a16ffb7f R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8d428ea0 FS: 00007f114c5b18c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd82872bfe8 CR3: 00000000a17b9000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1161 [inline] bpf_trace_run7+0xc2/0x2c0 kernel/trace/bpf_trace.c:1206 __bpf_trace_lock_acquire+0x1bc/0x200 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x298/0x3c0 kernel/locking/lockdep.c:3907 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:152 debug_object_activate+0x12f/0x450 lib/debugobjects.c:472 debug_object_activate+0x390/0x450 lib/debugobjects.c:513 debug_rcu_head_queue kernel/rcu/rcu.h:193 [inline] __call_rcu.constprop.0+0x31/0x7f0 kernel/rcu/tree.c:2977 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f114bb40840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffe52725528 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffe52725830 RCX: 00007f114bb40840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000557c8314aaf0 RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000557c8313d040 R14: 00007ffe527257f0 R15: 0000557c8314a6f0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: e9 23 fe ff ff jmpq 0xfffffe28 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 48 8b 34 24 mov (%rsp),%rsi 18: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax 1f: 01 00 21: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f59f4 * 28: 81 e2 00 01 1f 00 and $0x1f0100,%edx <-- trapping instruction 2e: 75 2b jne 0x5b 30: 8b 90 60 13 00 00 mov 0x1360(%rax),%edx 36: 83 fa 02 cmp $0x2,%edx 39: 75 20 jne 0x5b 3b: 48 rex.W 3c: 8b .byte 0x8b 3d: 88 .byte 0x88