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Date:   Fri, 12 Apr 2019 13:16:10 -0700
From:   syzbot <syzbot+54c2f58f15fe6876b6ad@...kaller.appspotmail.com>
To:     abbotti@....co.uk, andreyknvl@...gle.com,
        devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        hsweeten@...ionengravers.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: INFO: trying to register non-static key in vmk80xx_detach

syzbot has found a reproducer for the following crash on:

HEAD commit:    9a33b369 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan/tree/usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=11bed6fd200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
dashboard link: https://syzkaller.appspot.com/bug?extid=54c2f58f15fe6876b6ad
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15fdc6bf200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=156dc2d3200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+54c2f58f15fe6876b6ad@...kaller.appspotmail.com

usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=10cf, idProduct=8068,  
bcdDevice=e6.8d
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
vmk80xx 1-1:0.117: driver 'vmk80xx' failed to auto-configure device.
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xe8/0x16e lib/dump_stack.c:113
  assign_lock_key kernel/locking/lockdep.c:786 [inline]
  register_lock_class+0x11b8/0x1250 kernel/locking/lockdep.c:1095
  __lock_acquire+0xfb/0x37c0 kernel/locking/lockdep.c:3582
  lock_acquire+0x10d/0x2f0 kernel/locking/lockdep.c:4211
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0x44/0x60 kernel/locking/spinlock.c:152
  down+0x12/0x80 kernel/locking/semaphore.c:58
  vmk80xx_detach+0x59/0x100 drivers/staging/comedi/drivers/vmk80xx.c:829
  comedi_device_detach+0xed/0x800 drivers/staging/comedi/drivers.c:204
  comedi_device_cleanup.part.0+0x68/0x140  
drivers/staging/comedi/comedi_fops.c:156
  comedi_device_cleanup drivers/staging/comedi/comedi_fops.c:187 [inline]
  comedi_free_board_dev.part.0+0x16/0x90  
drivers/staging/comedi/comedi_fops.c:190
  comedi_free_board_dev drivers/staging/comedi/comedi_fops.c:189 [inline]
  comedi_release_hardware_device+0x111/0x140  
drivers/staging/comedi/comedi_fops.c:2880
  comedi_auto_config.cold+0x124/0x1b0 drivers/staging/comedi/drivers.c:1068
  usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
  really_probe+0x2da/0xb10 drivers/base/dd.c:509
  driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
  __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
  __device_attach+0x223/0x3a0 drivers/base/dd.c:844
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
  device_add+0xad2/0x16e0 drivers/base/core.c:2106
  usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
  generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
  usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
  really_probe+0x2da/0xb10 drivers/base/dd.c:509
  driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
  __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
  __device_attach+0x223/0x3a0 drivers/base/dd.c:844
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
  device_add+0xad2/0x16e0 drivers/base/core.c:2106
  usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534
  hub_port_connect drivers/usb/core/hub.c:5089 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
  port_event drivers/usb/core/hub.c:5350 [inline]
  hub_event+0x138e/0x3b00 drivers/usb/core/hub.c:5432
  process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
  worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
  kthread+0x313/0x420 kernel/kthread.c:253
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN PTI
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:__list_add_valid+0x47/0xa0 lib/list_debug.c:26
Code: fa 48 c1 ea 03 80 3c 02 00 75 50 49 8b 54 24 08 48 39 f2 0f 85 59 01  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 <80> 3c 02 00 75  
3a 48 8b 16 4c 39 e2 0f 85 5e 01 00 00 48 39 f5 0f
RSP: 0018:ffff8880a84a7110 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff888097143850 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888097143898
RBP: ffff8880a84a7170 R08: ffff8880a8491880 R09: ffffed1015094e31
R10: ffffed1015094e30 R11: 0000000000000003 R12: ffff888097143890
R13: 0000000000000000 R14: ffff888097143898 R15: ffff888097143890
FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe70ec4d000 CR3: 000000009a600000 CR4: 00000000001406f0
Call Trace:
  __list_add include/linux/list.h:60 [inline]
  list_add_tail include/linux/list.h:93 [inline]
  __down_common kernel/locking/semaphore.c:210 [inline]
  __down+0xa7/0x2c0 kernel/locking/semaphore.c:238
  down+0x5c/0x80 kernel/locking/semaphore.c:62
  vmk80xx_detach+0x59/0x100 drivers/staging/comedi/drivers/vmk80xx.c:829
  comedi_device_detach+0xed/0x800 drivers/staging/comedi/drivers.c:204
  comedi_device_cleanup.part.0+0x68/0x140  
drivers/staging/comedi/comedi_fops.c:156
  comedi_device_cleanup drivers/staging/comedi/comedi_fops.c:187 [inline]
  comedi_free_board_dev.part.0+0x16/0x90  
drivers/staging/comedi/comedi_fops.c:190
  comedi_free_board_dev drivers/staging/comedi/comedi_fops.c:189 [inline]
  comedi_release_hardware_device+0x111/0x140  
drivers/staging/comedi/comedi_fops.c:2880
  comedi_auto_config.cold+0x124/0x1b0 drivers/staging/comedi/drivers.c:1068
  usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
  really_probe+0x2da/0xb10 drivers/base/dd.c:509
  driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
  __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
  __device_attach+0x223/0x3a0 drivers/base/dd.c:844
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
  device_add+0xad2/0x16e0 drivers/base/core.c:2106
  usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
  generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
  usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
  really_probe+0x2da/0xb10 drivers/base/dd.c:509
  driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
  __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
  __device_attach+0x223/0x3a0 drivers/base/dd.c:844
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
  device_add+0xad2/0x16e0 drivers/base/core.c:2106
  usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534
  hub_port_connect drivers/usb/core/hub.c:5089 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
  port_event drivers/usb/core/hub.c:5350 [inline]
  hub_event+0x138e/0x3b00 drivers/usb/core/hub.c:5432
  process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
  worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
  kthread+0x313/0x420 kernel/kthread.c:253
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace a32085c9f9945bfb ]---
RIP: 0010:__list_add_valid+0x47/0xa0 lib/list_debug.c:26
Code: fa 48 c1 ea 03 80 3c 02 00 75 50 49 8b 54 24 08 48 39 f2 0f 85 59 01  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 <80> 3c 02 00 75  
3a 48 8b 16 4c 39 e2 0f 85 5e 01 00 00 48 39 f5 0f
RSP: 0018:ffff8880a84a7110 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff888097143850 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888097143898
RBP: ffff8880a84a7170 R08: ffff8880a8491880 R09: ffffed1015094e31
R10: ffffed1015094e30 R11: 0000000000000003 R12: ffff888097143890
R13: 0000000000000000 R14: ffff888097143898 R15: ffff888097143890
FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe70ec4d000 CR3: 000000009a600000 CR4: 00000000001406f0

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