INFO: task jbd2/sda1-8:2823 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:jbd2/sda1-8 state:D stack:25960 pid:2823 tgid:2823 ppid:2 task_flags:0x240040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x145d/0x4a00 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6960 io_schedule+0xbf/0x130 kernel/sched/core.c:7789 bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250 __wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52 out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67 wait_on_bit_io include/linux/wait_bit.h:105 [inline] __wait_on_buffer+0x64/0x70 fs/buffer.c:123 wait_on_buffer include/linux/buffer_head.h:420 [inline] journal_wait_on_commit_record fs/jbd2/commit.c:171 [inline] jbd2_journal_commit_transaction+0x49e0/0x67f0 fs/jbd2/commit.c:881 kjournald2+0x1f4/0x760 fs/jbd2/journal.c:201 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Showing all locks held in the system: 4 locks held by kworker/1:0/23: #0: ffff888100071948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232 #1: ffffc9000018fca0 (kernfs_notify_work ){+.+.}-{0:0} , at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233 #2: ffff888100ac5ab8 (&root->kernfs_supers_rwsem ){++++}-{4:4} , at: kernfs_notify_workfn+0xf7/0xb30 fs/kernfs/file.c:932 #3: ffff888100ac5988 ( &root->kernfs_rwsem ){++++}-{4:4} , at: kernfs_notify_workfn+0xff/0xb30 fs/kernfs/file.c:933 1 lock held by khungtaskd/30: #0: ffffffff892cd6e0 (rcu_read_lock ){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] ){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] ){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775 5 locks held by kworker/1:1/43: 5 locks held by kworker/u8:14/1710: #0: ffff888100ac4948 ( (wq_completion)netns ){+.+.}-{0:0} , at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232 #1: ffffc90002a2fca0 (net_cleanup_work ){+.+.}-{0:0} , at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233 #2: ffffffff8a6505b0 (pernet_ops_rwsem ){++++}-{4:4} , at: cleanup_net+0xad/0x900 net/core/net_namespace.c:670 #3: ffffffff8a666c68 (rtnl_mutex ){+.+.}-{4:4} , at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] , at: ops_undo_list+0x7e9/0xab0 net/core/net_namespace.c:248 #4: ffffffff892d8e38 (rcu_state.exp_mutex ){+.+.}-{4:4} , at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:343 3 locks held by kworker/0:2/2821: #0: ffff888100071948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232 #1: ffffc90003f6fca0 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233 #2: ffffffff892d8d00 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816 2 locks held by getty/2924: #0: ffff888115de00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000452f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x1510 drivers/tty/n_tty.c:2211 5 locks held by kworker/1:5/5322: #0: ffff8881056fa548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232 #1: ffffc900025a7ca0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233 #2: ffff88810a78c198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline] #2: ffff88810a78c198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5420 drivers/usb/core/hub.c:5899 #3: ffff8881351f4198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline] #3: ffff8881351f4198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x9e0 drivers/usb/core/hub.c:2336 #4: ffff888100ac5988 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x3d/0x100 fs/kernfs/dir.c:1715 8 locks held by kworker/1:4/13825: 1 lock held by syz-executor/16374: #0: ffffffff8a6505b0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577 2 locks held by syz-executor/16385: #0: ffffffff8a6505b0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577 #1: ffffffff892d8e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:343 1 lock held by syz-executor/16388: #0: ffffffff8a6505b0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577 2 locks held by syz-executor/16406: #0: ffffffff8a6505b0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577 #1: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: ipmr_net_exit_batch+0x15/0xa0 net/ipv4/ipmr.c:3276 1 lock held by syz-executor/16408: #0: ffffffff8a6505b0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577 1 lock held by syz-executor/16425: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x1f00 net/core/rtnetlink.c:4071 1 lock held by syz-executor/16436: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x1f00 net/core/rtnetlink.c:4071 1 lock held by syz-executor/16438: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x1f00 net/core/rtnetlink.c:4071 1 lock held by syz-executor/16458: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 3 locks held by kworker/u8:3/16467: #0: ffff88810e3ef148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232 #1: ffffc900021cfca0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233 #2: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4734 1 lock held by syz-executor/16470: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 1 lock held by syz-executor/16474: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 1 lock held by syz-executor/16478: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 1 lock held by syz-executor/16482: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 1 lock held by syz-executor/16486: #0: ffffffff8a666c68 (rtnl_mutex){+.+.}-{4:4} , at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] , at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 1 lock held by syz-executor/16490: #0: ffffffff8a666c68 ( rtnl_mutex){+.+.}-{4:4} , at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] , at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:978 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x133/0x180 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline] watchdog+0xe66/0x1180 kernel/hung_task.c:515 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Sending NMI from CPU 0 to CPUs 1: cdc_wdm 10-1:1.0: Stall on int endpoint NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 16358 Comm: kworker/1:8 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events legacy_dvb_usb_read_remote_control RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:407 Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d e9 06 7a 75 04 e8 a1 4c fd fe eb a0 e8 2a 4d fd RSP: 0018:ffffc900001a84c0 EFLAGS: 00000002 RAX: 000000000000005d RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: ffffffff82e46c25 RDI: ffffffff93c8afc0 RBP: ffffffff93c8af80 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000000 R11: ffff888115dec528 R12: 0000000000000000 R13: 000000000000005d R14: ffffffff93c8af80 R15: ffffffff82e46bc0 FS: 0000000000000000(0000) GS:ffff888268cf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4365bd62c0 CR3: 00000000090a6000 CR4: 00000000003506f0 Call Trace: serial_port_out include/linux/serial_core.h:811 [inline] serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3192 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3264 [inline] serial8250_console_write+0xfbd/0x1890 drivers/tty/serial/8250/8250_port.c:3342 console_emit_next_record kernel/printk/printk.c:3129 [inline] console_flush_one_record+0x796/0xc60 kernel/printk/printk.c:3215 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 dev_vprintk_emit drivers/base/core.c:4914 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925 __dev_printk+0xf5/0x270 drivers/base/core.c:4937 _dev_err+0xe4/0x120 drivers/base/core.c:4980 wdm_int_callback+0x3dd/0xbd0 drivers/usb/class/cdc-wdm.c:270 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745 dummy_timer+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858 handle_softirqs+0x208/0x940 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_flush_one_record+0x995/0xc60 kernel/printk/printk.c:3216 Code: 00 e8 8f 65 29 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 8d 49 21 00 48 85 ed 0f 85 8e 01 00 00 e8 af 4e 21 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 84 b4 fe ff ff 4c 89 ef e8 74 1b 83 RSP: 0018:ffffc900028877d8 EFLAGS: 00000293 RAX: ffffffff89816558 RBX: 0000000000000001 RCX: ffffffff815e9df3 RDX: ffff888115deba80 RSI: ffffffff815e9e01 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffff888115dec528 R12: 0000000000000001 R13: ffffffff89816558 R14: ffffffff89816500 R15: dffffc0000000000 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 _printk+0xc7/0x100 kernel/printk/printk.c:2451 legacy_dvb_usb_read_remote_control+0x40b/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:124 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Cannot schedule work cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint cdc_wdm 10-1:1.0: Stall on int endpoint raw-gadget.4 gadget.9: ignoring, device is not running cdc_wdm 10-1:1.0: nonzero urb status received: -EPIPE