Re: general protection fault in drain_workqueue

[Andrey Konovalov <andreyknvl@google.com>]

On Mon, May 13, 2019 at 2:27 PM syzbot
<syzbot+09139d1a5ed6b898e29d@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    43151d6c 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=17022474a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234
> dashboard link: https://syzkaller.appspot.com/bug?extid=09139d1a5ed6b898e29d
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15752dc8a00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+09139d1a5ed6b898e29d@syzkaller.appspotmail.com
>
> pegasus 4-1:0.103: can't reset MAC
> 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: 5 Comm: kworker/0:0 Not tainted 5.1.0-rc3-319004-g43151d6 #6
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> RIP: 0010:__lock_acquire+0xadc/0x37c0 kernel/locking/lockdep.c:3573
> Code: 00 0f 85 c1 1d 00 00 48 81 c4 10 01 00 00 5b 5d 41 5c 41 5d 41 5e 41
> 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f
> 85 35 1e 00 00 49 81 7d 00 00 19 01 96 0f 84 e8 f5
> RSP: 0018:ffff8880a8476e08 EFLAGS: 00010002
> RAX: dffffc0000000000 RBX: ffff8880a8469880 RCX: 0000000000000000
> RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000001
> RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> R10: ffff8880a8477160 R11: ffff8880a8469880 R12: 0000000000000000
> R13: 0000000000000080 R14: 0000000000000000 R15: 0000000000000001
> FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f3a1f740000 CR3: 0000000090bc0000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   lock_acquire+0x10d/0x2f0 kernel/locking/lockdep.c:4211
>   __mutex_lock_common kernel/locking/mutex.c:925 [inline]
>   __mutex_lock+0xfe/0x12b0 kernel/locking/mutex.c:1072
>   drain_workqueue+0x29/0x470 kernel/workqueue.c:2934
>   destroy_workqueue+0x23/0x6d0 kernel/workqueue.c:4320
>   pegasus_dec_workqueue drivers/net/usb/pegasus.c:1133 [inline]
>   pegasus_dec_workqueue drivers/net/usb/pegasus.c:1129 [inline]
>   pegasus_probe+0x1073/0x15e0 drivers/net/usb/pegasus.c:1228
>   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:2023
>   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
>   process_scheduled_works kernel/workqueue.c:2331 [inline]
>   worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417
>   kthread+0x313/0x420 kernel/kthread.c:253
>   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
> Modules linked in:
> ---[ end trace 01015c397d4bdcc4 ]---
> RIP: 0010:__lock_acquire+0xadc/0x37c0 kernel/locking/lockdep.c:3573
> Code: 00 0f 85 c1 1d 00 00 48 81 c4 10 01 00 00 5b 5d 41 5c 41 5d 41 5e 41
> 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f
> 85 35 1e 00 00 49 81 7d 00 00 19 01 96 0f 84 e8 f5
> RSP: 0018:ffff8880a8476e08 EFLAGS: 00010002
> RAX: dffffc0000000000 RBX: ffff8880a8469880 RCX: 0000000000000000
> RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000001
> RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> R10: ffff8880a8477160 R11: ffff8880a8469880 R12: 0000000000000000
> R13: 0000000000000080 R14: 0000000000000000 R15: 0000000000000001
> FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f3a1f740000 CR3: 0000000090bc0000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
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Hasn't happened for a while, probably got fixed.

#syz invalid