INFO: task kworker/0:0:6 blocked for more than 143 seconds.
Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0 state:D stack:22392 pid: 6 ppid: 2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5116 [inline]
__schedule+0x957/0xec0 kernel/sched/core.c:6428
schedule+0xeb/0x1b0 kernel/sched/core.c:6500
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6559
__mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
add_early_randomness drivers/char/hw_random/core.c:69 [inline]
hwrng_register+0x3bf/0x680 drivers/char/hw_random/core.c:599
chaoskey_probe+0x7f0/0xb10 drivers/usb/misc/chaoskey.c:205
usb_probe_interface+0x66e/0xb60 drivers/usb/core/driver.c:396
call_driver_probe+0x96/0x250
really_probe+0x220/0x940 drivers/base/dd.c:634
__driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:764
driver_probe_device+0x50/0x240 drivers/base/dd.c:794
__device_attach_driver+0x273/0x3d0 drivers/base/dd.c:917
bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427
__device_attach+0x372/0x5a0 drivers/base/dd.c:989
bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487
device_add+0xb20/0xf90 drivers/base/core.c:3417
usb_set_configuration+0x1a5f/0x20e0 drivers/usb/core/message.c:2170
usb_generic_driver_probe+0x83/0x140 drivers/usb/core/generic.c:238
usb_probe_device+0x131/0x260 drivers/usb/core/driver.c:293
call_driver_probe+0x96/0x250
really_probe+0x220/0x940 drivers/base/dd.c:634
__driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:764
driver_probe_device+0x50/0x240 drivers/base/dd.c:794
__device_attach_driver+0x273/0x3d0 drivers/base/dd.c:917
bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427
__device_attach+0x372/0x5a0 drivers/base/dd.c:989
bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487
device_add+0xb20/0xf90 drivers/base/core.c:3417
usb_new_device+0xbfc/0x18a0 drivers/usb/core/hub.c:2566
hub_port_connect+0x106b/0x2930 drivers/usb/core/hub.c:5363
hub_port_connect_change+0x619/0xbe0 drivers/usb/core/hub.c:5507
port_event+0xeb7/0x1390 drivers/usb/core/hub.c:5663
hub_event+0x5be/0xd70 drivers/usb/core/hub.c:5745
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
Showing all locks held in the system:
6 locks held by kworker/0:0/6:
#0: ffff8881459ead38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
#1: ffffc900000b7d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
#2: ffff88802123c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#2: ffff88802123c190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bf/0xd70 drivers/usb/core/hub.c:5691
#3: ffff88807ad7a190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#3: ffff88807ad7a190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x5a0 drivers/base/dd.c:964
#4: ffff88807ad79118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
#4: ffff88807ad79118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x5a0 drivers/base/dd.c:964
#5: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: add_early_randomness drivers/char/hw_random/core.c:69 [inline]
#5: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: hwrng_register+0x3bf/0x680 drivers/char/hw_random/core.c:599
2 locks held by pr/ttyS0/16:
1 lock held by khungtaskd/29:
#0: ffffffff8cb1eee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by hwrng/756:
#0: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0xec/0x470 drivers/char/hw_random/core.c:503
2 locks held by getty/3299:
#0: ffff88814ad04098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc90002cd62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2124
3 locks held by udevd/4977:
#0: ffff8880218e2c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_file_read_iter fs/kernfs/file.c:197 [inline]
#0: ffff8880218e2c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_read_iter+0x19b/0x570 fs/kernfs/file.c:236
#1: ffff88801e302660 (kn->active#86){++++}-{0:0}, at: kernfs_file_read_iter fs/kernfs/file.c:198 [inline]
#1: ffff88801e302660 (kn->active#86){++++}-{0:0}, at: kernfs_fop_read_iter+0x1b3/0x570 fs/kernfs/file.c:236
#2: ffff88807ad7a190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:840 [inline]
#2: ffff88807ad7a190 (&dev->mutex){....}-{3:3}, at: read_descriptors+0x30/0x390 drivers/usb/core/sysfs.c:873
2 locks held by syz-executor.0/8507:
2 locks held by syz-executor.1/8508:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xd18/0xd60 kernel/hung_task.c:378
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16 Comm: pr/ttyS0 Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_serial_in+0x71/0xb0 drivers/tty/serial/8250/8250_port.c:460
Code: 25 ca d6 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 56 b2 29 fd 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 89 e9 80 e1 07 38 c1 7c ad 48 89 ef
RSP: 0018:ffffc90000157958 EFLAGS: 00000002
RAX: 1ffffffff2319500 RBX: ffffffff918ca9a0 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff84b0c9a1 R09: ffffed1003af4047
R10: ffffed1003af4047 R11: 1ffff11003af4046 R12: 0000000000000000
R13: ffff888140160830 R14: 00000000000003fd R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020845030 CR3: 0000000020845000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:118 [inline]
wait_for_lsr drivers/tty/serial/8250/8250_port.c:2085 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3354 [inline]
serial8250_console_write+0x10d1/0x16d0 drivers/tty/serial/8250/8250_port.c:3436
call_console_driver kernel/printk/printk.c:2075 [inline]
__console_emit_next_record+0x82c/0xb30 kernel/printk/printk.c:2916
console_emit_next_record kernel/printk/printk.c:3721 [inline]
printk_kthread_func+0x9d8/0xd20 kernel/printk/printk.c:3837
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
----------------
Code disassembly (best guess):
0: 25 ca d6 fc 89 and $0x89fcd6ca,%eax
5: e9 41 d3 e6 48 jmpq 0x48e6d34b
a: 83 c3 40 add $0x40,%ebx
d: 48 89 d8 mov %rbx,%rax
10: 48 c1 e8 03 shr $0x3,%rax
14: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
19: 74 08 je 0x23
1b: 48 89 df mov %rbx,%rdi
1e: e8 56 b2 29 fd callq 0xfd29b279
23: 44 03 33 add (%rbx),%r14d
26: 44 89 f2 mov %r14d,%edx
29: ec in (%dx),%al
* 2a: 0f b6 c0 movzbl %al,%eax <-- trapping instruction
2d: 5b pop %rbx
2e: 41 5e pop %r14
30: 41 5f pop %r15
32: 5d pop %rbp
33: c3 retq
34: 89 e9 mov %ebp,%ecx
36: 80 e1 07 and $0x7,%cl
39: 38 c1 cmp %al,%cl
3b: 7c ad jl 0xffffffea
3d: 48 89 ef mov %rbp,%rdi