INFO: task systemd-shutdow:1 blocked for more than 143 seconds.
Not tainted 5.9.0-rc8-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-shutdow state:D stack:24448 pid: 1 ppid: 0 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:3778 [inline]
__schedule+0x88f/0x1f80 kernel/sched/core.c:4527
schedule+0xcd/0x2b0 kernel/sched/core.c:4602
wait_for_device_probe+0x1be/0x220 drivers/base/dd.c:702
device_shutdown+0x18/0x5b5 drivers/base/core.c:3994
kernel_restart_prepare kernel/reboot.c:76 [inline]
kernel_restart kernel/reboot.c:246 [inline]
__do_sys_reboot.cold+0x5d/0x9d kernel/reboot.c:347
do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7ff6cbe4d8c6
Code: Bad RIP value.
RSP: 002b:00007ffdec956968 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff6cbe4d8c6
RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead
RBP: 00007ffdec9569f8 R08: 0000000000005001 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000561b7abe5150 R15: 00007ffdec956ce8
Showing all locks held in the system:
1 lock held by systemd-shutdow/1:
#0: ffffffff872ea808 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a4/0x3e0 kernel/reboot.c:344
9 locks held by kworker/1:1/21:
1 lock held by khungtaskd/23:
#0: ffffffff87313c20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5852
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.9.0-rc8-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+0x107/0x16e 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: 21 Comm: kworker/1:1 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1783 [inline]
RIP: 0010:vprintk_emit+0x37e/0x520 kernel/printk/printk.c:2028
Code: 30 87 e8 a5 08 fd ff 0f b6 1d 3e be 66 08 31 ff 89 de e8 85 42 16 00 84 db 5a 74 1b e8 0b 4a 16 00 f3 90 0f b6 1d 22 be 66 08 <31> ff 89 de e8 69 42 16 00 84 db 75 e5 e8 f0 49 16 00 48 c7 c6 cb
RSP: 0018:ffff8881da33eba8 EFLAGS: 00000046
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc9000dca5000
RDX: 0000000000040000 RSI: ffffffff8129c7b5 RDI: 0000000000000001
RBP: 0000000000000200 R08: 0000000000000000 R09: ffffffff895cb5e7
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000058
R13: 0000000000000246 R14: ffff8881d8ce0000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8199269ab4 CR3: 0000000007224000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
dev_vprintk_emit+0x3eb/0x436 drivers/base/core.c:4129
dev_printk_emit+0xba/0xf1 drivers/base/core.c:4140
__netdev_printk+0x1c6/0x27a net/core/dev.c:10749
netdev_warn+0xd7/0x109 net/core/dev.c:10802
asix_write_cmd.cold+0x3a/0x46 drivers/net/usb/asix_common.c:52
asix_set_sw_mii drivers/net/usb/asix_common.c:275 [inline]
asix_mdio_read+0xef/0x320 drivers/net/usb/asix_common.c:454
asix_phy_reset+0x104/0x170 drivers/net/usb/asix_devices.c:215
ax88172_bind+0x412/0x5d0 drivers/net/usb/asix_devices.c:272
usbnet_probe+0xb47/0x2720 drivers/net/usb/usbnet.c:1738
usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
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:2926
usb_set_configuration+0x1111/0x1880 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:240
usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
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:2926
usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554
hub_port_connect drivers/usb/core/hub.c:5222 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
port_event drivers/usb/core/hub.c:5508 [inline]
hub_event+0x2348/0x42b0 drivers/usb/core/hub.c:5590
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