WARNING in _chaoskey_fill/usb_submit_urb

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: e0bd8d79 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=1452c6a1600000
kernel config: https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
dashboard link: https://syzkaller.appspot.com/bug?extid=f5349b421c6213d34ce2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16342d45600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166769b1600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f5349b...@syzkaller.appspotmail.com

------------[ cut here ]------------
URB 00000000052bee21 submitted while active
WARNING: CPU: 1 PID: 1794 at drivers/usb/core/urb.c:362
usb_submit_urb+0x10c1/0x13b0 drivers/usb/core/urb.c:362
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 1794 Comm: syz-executor305 Not tainted 5.3.0+ #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+0xca/0x13e lib/dump_stack.c:113
panic+0x2a3/0x6da kernel/panic.c:219
__warn.cold+0x20/0x4a kernel/panic.c:576
report_bug+0x262/0x2a0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:usb_submit_urb+0x10c1/0x13b0 drivers/usb/core/urb.c:362
Code: 89 de e8 92 5b ee fd 84 db 0f 85 42 f6 ff ff e8 55 5a ee fd 4c 89 fe
48 c7 c7 00 c2 18 86 c6 05 f3 cf 38 04 01 e8 f4 e5 c3 fd <0f> 0b e9 20 f6
ff ff c7 44 24 14 01 00 00 00 e9 d7 f6 ff ff 41 bd
RSP: 0018:ffff8881d0427b68 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8128d9ad RDI: ffffed103a084f5f
RBP: ffff8881d070b180 R08: ffff8881d4934800 R09: ffffed103b663ee7
R10: ffffed103b663ee6 R11: ffff8881db31f737 R12: ffff8881d070b180
R13: 00000000fffffff0 R14: 0000000000000000 R15: ffff8881d5c22400
_chaoskey_fill.part.0+0xe0/0x470 drivers/usb/misc/chaoskey.c:367
_chaoskey_fill+0x1ad/0x230 drivers/usb/misc/chaoskey.c:361
chaoskey_read+0x2c2/0x4c0 drivers/usb/misc/chaoskey.c:434
__vfs_read+0x76/0x100 fs/read_write.c:425
vfs_read+0x1ea/0x430 fs/read_write.c:461
ksys_read+0x127/0x250 fs/read_write.c:587
do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4419c9
Code: e8 8c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc317ed1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004419c9
RDX: 0000000000000009 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000000e12e R08: 000000000000000f R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402720
R13: 00000000004027b0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this bug report. See:
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

[Oliver Neukum]

Am Montag, den 23.09.2019, 07:31 -0700 schrieb syzbot:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: e0bd8d79 usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=1452c6a1600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
> dashboard link: https://syzkaller.appspot.com/bug?extid=f5349b421c6213d34ce2
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16342d45600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166769b1600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+f5349b...@syzkaller.appspotmail.com

#syz test: https://github.com/google/kasan.git e0bd8d79

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer still triggered
crash:
INFO: task hung in chaoskey_disconnect

INFO: task kworker/0:0:5 blocked for more than 143 seconds.
Not tainted 5.3.0+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:0 D25976 5 2 0x80004000
Workqueue: usb_hub_wq hub_event
Call Trace:
schedule+0xca/0x250 kernel/sched/core.c:4123
schedule_timeout+0x682/0xb20 kernel/time/timer.c:1869
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136
kthread_stop+0x10c/0x600 kernel/kthread.c:559
hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538
chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:231
usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
__device_release_driver drivers/base/dd.c:1134 [inline]
device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
device_del+0x420/0xb10 drivers/base/core.c:2375
usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199
hub_port_connect drivers/usb/core/hub.c:4949 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
port_event drivers/usb/core/hub.c:5359 [inline]
hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441
process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
worker_thread+0x96/0xe20 kernel/workqueue.c:2415
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Showing all locks held in the system:
5 locks held by kworker/0:0/5:
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881da1c7dd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5c97900 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5c97900 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d9034600 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d9034600 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d9037010 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/0:1/12:
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881da20fdd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5d06800 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5d06800 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881c9c8b500 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881c9c8b500 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881c9c8a390 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/1:1/21:
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881da2f7dd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5cd7080 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5cd7080 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d9135f80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d9135f80 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d9040a10 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
1 lock held by khungtaskd/23:
#0: ffffffff86cff360 (rcu_read_lock){....}, at:
debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335
1 lock held by rsyslogd/1600:
#0: ffff8881d654d4e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100
fs/file.c:801
2 locks held by getty/1690:
#0: ffff8881d919ef10 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc900004592e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1691:
#0: ffff8881d747b390 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc900004752e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1692:
#0: ffff8881d919bc10 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000046d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1693:
#0: ffff8881d91c8910 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc900004652e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1694:
#0: ffff8881d7936f10 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000047d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1695:
#0: ffff8881d91ccd10 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1696:
#0: ffff8881d9228090 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000044d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
5 locks held by kworker/0:3/2834:
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881d950fdd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5d32400 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5d32400 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881c9c8f080 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881c9c8f080 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881c9c8f890 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/1:4/2867:
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881c708fdd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5cd3500 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5cd3500 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d9042400 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d9042400 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d9044590 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/1:5/2904:
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91c0b28 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881d4b7fdd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5d02c80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5d02c80 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d9134e80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d9134e80 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881c9eb7890 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.3.0+ #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+0xca/0x13e lib/dump_stack.c:113

nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0x9a4/0xe50 kernel/hung_task.c:289
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:mark_usage kernel/locking/lockdep.c:3551 [inline]
RIP: 0010:__lock_acquire+0x401/0x3eb0 kernel/locking/lockdep.c:3909
Code: 38 01 00 00 45 85 c0 41 89 47 24 0f 84 ee 00 00 00 49 8d 7f 21 48 b8
00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 <48> 89 fa 83 e2
07 38 d0 7f 08 84 c0 0f 85 d1 2f 00 00 4d 8d 6f 22
RSP: 0018:ffff8881db309b90 EFLAGS: 00000802
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 1ffff1103b43f713 RSI: 0000000000000027 RDI: ffff8881da1fb899
RBP: ffff8881da1fb000 R08: 0000000000000001 R09: 00000000000c4027
R10: 0000000000000000 R11: ffffffff878a4807 R12: 0000000000000027
R13: 0000000000040000 R14: 0000000000000002 R15: ffff8881da1fb878
FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001c06c2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4487
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151
rq_lock kernel/sched/sched.h:1211 [inline]
ttwu_queue kernel/sched/core.c:2407 [inline]
try_to_wake_up+0xaf0/0x15e0 kernel/sched/core.c:2643
hrtimer_wakeup+0x43/0x60 kernel/time/hrtimer.c:1766
__run_hrtimer kernel/time/hrtimer.c:1514 [inline]
__hrtimer_run_queues+0x303/0xc50 kernel/time/hrtimer.c:1576
hrtimer_interrupt+0x2e8/0x730 kernel/time/hrtimer.c:1638
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
smp_apic_timer_interrupt+0xf5/0x500 arch/x86/kernel/apic/apic.c:1135
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
</IRQ>
RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:581
Code: 90 90 41 56 41 55 65 44 8b 2d 94 9d 90 7a 41 54 55 53 0f 1f 44 00 00
e8 36 71 d2 fb e9 07 00 00 00 0f 00 2d ca 43 51 00 fb f4 <65> 44 8b 2d 70
9d 90 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffff8881da217dc8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff8881da1fb000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881da1fb84c
RBP: ffffed103b43f600 R08: ffff8881da1fb000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x3b6/0x500 kernel/sched/idle.c:264
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:356
start_secondary+0x27d/0x330 arch/x86/kernel/smpboot.c:264
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241


Tested on:

commit: e0bd8d79 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git

console output: https://syzkaller.appspot.com/x/log.txt?x=114486ed600000

kernel config: https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
dashboard link: https://syzkaller.appspot.com/bug?extid=f5349b421c6213d34ce2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

patch: https://syzkaller.appspot.com/x/patch.diff?x=16425605600000

[Oliver Neukum]

Am Montag, den 23.09.2019, 07:31 -0700 schrieb syzbot:

> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: e0bd8d79 usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=1452c6a1600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
> dashboard link: https://syzkaller.appspot.com/bug?extid=f5349b421c6213d34ce2
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16342d45600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166769b1600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+f5349b...@syzkaller.appspotmail.com

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer still triggered
crash:
INFO: task hung in chaoskey_disconnect

INFO: task kworker/0:0:5 blocked for more than 143 seconds.
Not tainted 5.3.0+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/0:0 D25832 5 2 0x80004000

INFO: task kworker/1:1:22 blocked for more than 143 seconds.

Not tainted 5.3.0+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/1:1 D26096 22 2 0x80004000

INFO: task kworker/0:3:2851 blocked for more than 143 seconds.

Not tainted 5.3.0+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/0:3 D25960 2851 2 0x80004000

INFO: task kworker/1:3:2862 blocked for more than 144 seconds.

Not tainted 5.3.0+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/1:3 D25680 2862 2 0x80004000

#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:

process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881da1c7dd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244

#2: ffff8881d5d70200 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5d70200 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d602a400 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d602a400 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d602c590 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/1:1/22:
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881d9697dd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5cdce80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5cdce80 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881c9fdbd80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881c9fdbd80 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d76e6790 (&dev->mutex){....}, at:

device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
1 lock held by khungtaskd/23:
#0: ffffffff86cff360 (rcu_read_lock){....}, at:
debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335

1 lock held by rsyslogd/1596:
#0: ffff8881d987f9e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100
fs/file.c:801
2 locks held by getty/1686:
#0: ffff8881d67dd590 (&tty->ldisc_sem){++++}, at:

tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156

2 locks held by getty/1687:
#0: ffff8881d9041190 (&tty->ldisc_sem){++++}, at:

tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000047d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156

2 locks held by getty/1688:
#0: ffff8881d9047790 (&tty->ldisc_sem){++++}, at:

tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000044d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156

2 locks held by getty/1689:
#0: ffff8881d903d590 (&tty->ldisc_sem){++++}, at:

tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc900004752e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156

2 locks held by getty/1690:
#0: ffff8881d903e690 (&tty->ldisc_sem){++++}, at:

tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc9000046d2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156

2 locks held by getty/1691:
#0: ffff8881d903de10 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc900004712e0 (&ldata->atomic_read_lock){+.+.}, at:

n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1692:

#0: ffff8881d67de690 (&tty->ldisc_sem){++++}, at:
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: ffffc900004452e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
5 locks held by kworker/0:2/2807:
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881c780fdd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5d08a80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5d08a80 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d6601300 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d6601300 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d602ac10 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/0:3/2851:
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881d80b7dd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5cd9300 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5cd9300 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d6000a80 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d6000a80 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d6001b10 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/1:3/2862:
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881c19efdd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5d0c600 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5d0c600 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881d814f080 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881d814f080 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d814f890 (&dev->mutex){....}, at:
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
5 locks held by kworker/1:5/2877:
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
__write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set
include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data
kernel/workqueue.c:620 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
#0: ffff8881d91f48a8 ((wq_completion)usb_hub_wq){+.+.}, at:
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
#1: ffff8881d7507dd0 ((work_completion)(&hub->events)){+.+.}, at:
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
#2: ffff8881d5ca5700 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#2: ffff8881d5ca5700 (&dev->mutex){....}, at: hub_event+0x17c/0x3640
drivers/usb/core/hub.c:5387
#3: ffff8881c9f08200 (&dev->mutex){....}, at: device_lock
include/linux/device.h:1462 [inline]
#3: ffff8881c9f08200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0
drivers/usb/core/hub.c:2190
#4: ffff8881d9035690 (&dev->mutex){....}, at:

device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.3.0+ #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+0xca/0x13e lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0x9a4/0xe50 kernel/hung_task.c:289
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:

NMI backtrace for cpu 1 skipped: idling at native_safe_halt
arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt
arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0x28/0x2e0
arch/x86/kernel/process.c:580


Tested on:

commit: e0bd8d79 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git

console output: https://syzkaller.appspot.com/x/log.txt?x=11c486ed600000

kernel config: https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
dashboard link: https://syzkaller.appspot.com/bug?extid=f5349b421c6213d34ce2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

patch: https://syzkaller.appspot.com/x/patch.diff?x=136ea5cb600000

[Andrey Konovalov]

#syz fix: USB: chaoskey: fix error case of a timeout