syzbot

INFO: task kworker/0:1:12 blocked for more than 143 seconds.
      Not tainted 5.8.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1     D23160    12      2 0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x889/0x1f70 kernel/sched/core.c:4527
 schedule+0xcd/0x2b0 kernel/sched/core.c:4602
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 usb_start_wait_urb.constprop.0+0x2ad/0x2f0 drivers/net/usb/kaweth.c:1238
 kaweth_internal_control_msg drivers/net/usb/kaweth.c:1274 [inline]
 kaweth_control.constprop.0+0x361/0x4f0 drivers/net/usb/kaweth.c:269
 kaweth_read_configuration drivers/net/usb/kaweth.c:287 [inline]
 kaweth_probe.cold+0xaa/0x12ec drivers/net/usb/kaweth.c:1065
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374
 really_probe+0x291/0xde0 drivers/base/dd.c:553
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:912
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb51/0x1c70 drivers/base/core.c:2930
 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:239
 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272
 really_probe+0x291/0xde0 drivers/base/dd.c:553
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:912
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb51/0x1c70 drivers/base/core.c:2930
 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5208 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x2361/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INFO: task syz-executor.5:3795 blocked for more than 143 seconds.
      Not tainted 5.8.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D29184  3795    352 0x80004006
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x889/0x1f70 kernel/sched/core.c:4527
 schedule+0xcd/0x2b0 kernel/sched/core.c:4602
 wdm_flush+0x2e9/0x3c0 drivers/usb/class/cdc-wdm.c:590
 filp_close+0xb4/0x170 fs/open.c:1282
 close_files fs/file.c:401 [inline]
 put_files_struct fs/file.c:429 [inline]
 put_files_struct+0x1d0/0x350 fs/file.c:426
 exit_files+0x7e/0xa0 fs/file.c:458
 do_exit+0xb75/0x2890 kernel/exit.c:801
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x410/0x1ef0 kernel/signal.c:2743
 arch_do_signal+0x88/0x1a00 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0x137/0x190 kernel/entry/common.c:166
 syscall_exit_to_user_mode+0x36/0x260 kernel/entry/common.c:241
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d239
Code: Bad RIP value.
RSP: 002b:00007f8560294cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000118d128 RCX: 000000000045d239
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118d128
RBP: 000000000118d120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c
R13: 00007ffc7beebe6f R14: 00007f85602959c0 R15: 000000000118d12c
INFO: task syz-executor.2:3733 blocked for more than 144 seconds.
      Not tainted 5.8.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28816  3733    354 0x80004006
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x889/0x1f70 kernel/sched/core.c:4527
 schedule+0xcd/0x2b0 kernel/sched/core.c:4602
 wdm_flush+0x2e9/0x3c0 drivers/usb/class/cdc-wdm.c:590
 filp_close+0xb4/0x170 fs/open.c:1282
 close_files fs/file.c:401 [inline]
 put_files_struct fs/file.c:429 [inline]
 put_files_struct+0x1d0/0x350 fs/file.c:426
 exit_files+0x7e/0xa0 fs/file.c:458
 do_exit+0xb75/0x2890 kernel/exit.c:801
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x410/0x1ef0 kernel/signal.c:2743
 arch_do_signal+0x88/0x1a00 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0x137/0x190 kernel/entry/common.c:166
 syscall_exit_to_user_mode+0x36/0x260 kernel/entry/common.c:241
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45b701
Code: Bad RIP value.
RSP: 002b:00007fffdb438c70 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: fffffffffffffdfc RBX: 0000000000013996 RCX: 000000000045b701
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fffdb438c80
RBP: 0000000000000001 R08: 0000000006aa7ae1 R09: 0000000006aa7ae5
R10: 00007fffdb438d80 R11: 0000000000000293 R12: 000000000118cf40
R13: 000000000118d940 R14: ffffffffffffffff R15: 000000000118d12c

Showing all locks held in the system:
5 locks held by kworker/0:1/12:
 #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8881d8919d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x15f0 kernel/workqueue.c:2240
 #1: ffff8881da25fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x15f0 kernel/workqueue.c:2244
 #2: ffff8881d4553218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline]
 #2: ffff8881d4553218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x4390 drivers/usb/core/hub.c:5522
 #3: ffff8881d06ec218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline]
 #3: ffff8881d06ec218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887
 #4: ffff8881cd8fc1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:784 [inline]
 #4: ffff8881cd8fc1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887
1 lock held by khungtaskd/23:
 #0: ffffffff87313660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5825
1 lock held by in:imklog/240:
 #0: ffff8881c85ecaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
2 locks held by agetty/247:
 #0: ffff8881cf8df098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc900009fe2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.8.0-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+0xf6/0x16e lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x74/0xb6 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1da/0x1f4 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd6a/0xfd0 kernel/hung_task.c:295
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 112 Comm: systemd-journal Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x7ff7c2a74290
Code: 00 00 e8 43 fe ff ff 85 c0 78 84 48 8b 04 24 48 89 83 d8 00 00 00 31 c0 e9 72 ff ff ff e8 a8 7c f1 ff 0f 1f 84 00 00 00 00 00 <53> 48 83 ec 10 64 48 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 48
RSP: 002b:00007ffd29b02558 EFLAGS: 00000206
RAX: 00007ff7c2d90000 RBX: 00005614a9a26e80 RCX: 613fc5b39338ed2c
RDX: 0000000000000025 RSI: 00005614a9a2f5b0 RDI: 00005614a9a26e80
RBP: 613fc5b39338ed2c R08: 00007ffd29b02638 R09: 00007ffd29b02640
R10: 00007ff7c2aa0ee8 R11: 00007ffd29b88080 R12: 00005614a9a26e80
R13: 0000000000000025 R14: 00005614a9a2f5b0 R15: 00007ffd29b02640
FS:  00007ff7c2d858c0 GS:  0000000000000000