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* WARNING in zd_mac_clear
@ 2019-04-12 11:46 syzbot
  2019-08-07 14:07 ` Andrey Konovalov
  0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2019-04-12 11:46 UTC (permalink / raw)
  To: andreyknvl, davem, dsd, kune, kvalo, linux-kernel, linux-usb,
	linux-wireless, netdev, syzkaller-bugs

Hello,

syzbot found 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=101a06dd200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
dashboard link: https://syzkaller.appspot.com/bug?extid=74c65761783d66a9c97c
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1170c22d200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1496adbb200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com

usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: reset low-speed USB device number 2 using dummy_hcd
usb 1-1: read over firmware interface failed: -71
usb 1-1: reset low-speed USB device number 2 using dummy_hcd
WARNING: CPU: 1 PID: 21 at drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238  
zd_mac_clear+0xb0/0xe0 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 21 Comm: kworker/1:1 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
  panic+0x29d/0x5f2 kernel/panic.c:214
  __warn.cold+0x20/0x48 kernel/panic.c:571
  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+0x130/0x1f0 arch/x86/kernel/traps.c:272
  do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:zd_mac_clear+0xb0/0xe0  
drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
Code: e8 85 d0 60 f8 48 8d bb f8 2b 00 00 be ff ff ff ff e8 54 5a 46 f8 31  
ff 89 c3 89 c6 e8 d9 d1 60 f8 85 db 75 d4 e8 60 d0 60 f8 <0f> 0b 5b 5d e9  
57 d0 60 f8 48 c7 c7 58 05 cb 93 e8 fb e0 97 f8 eb
RSP: 0018:ffff8880a85c7310 EFLAGS: 00010293
RAX: ffff8880a84de200 RBX: 0000000000000000 RCX: ffffffff8910f507
RDX: 0000000000000000 RSI: ffffffff8910f510 RDI: 0000000000000005
RBP: 0000000000000001 R08: ffff8880a84de200 R09: ffffed1012f83a0b
R10: ffffed1012f83a0a R11: ffff888097c1d057 R12: 00000000ffffffb9
R13: ffff888097c18b20 R14: ffff888099456630 R15: ffffffff8f979398
  probe+0x259/0x590 drivers/net/wireless/zydas/zd1211rw/zd_usb.c:1421
  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
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.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: WARNING in zd_mac_clear
  2019-04-12 11:46 WARNING in zd_mac_clear syzbot
@ 2019-08-07 14:07 ` Andrey Konovalov
  2019-08-07 14:18   ` Oliver Neukum
  0 siblings, 1 reply; 5+ messages in thread
From: Andrey Konovalov @ 2019-08-07 14:07 UTC (permalink / raw)
  To: syzbot, USB list
  Cc: David S. Miller, Daniel Drake, Ulrich Kunitz, Kalle Valo, LKML,
	linux-wireless, netdev, syzkaller-bugs, Alan Stern,
	Oliver Neukum

On Fri, Apr 12, 2019 at 1:46 PM syzbot
<syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found 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=101a06dd200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
> dashboard link: https://syzkaller.appspot.com/bug?extid=74c65761783d66a9c97c
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1170c22d200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1496adbb200000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com
>
> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> usb 1-1: config 0 descriptor??
> usb 1-1: reset low-speed USB device number 2 using dummy_hcd
> usb 1-1: read over firmware interface failed: -71
> usb 1-1: reset low-speed USB device number 2 using dummy_hcd
> WARNING: CPU: 1 PID: 21 at drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
> zd_mac_clear+0xb0/0xe0 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 21 Comm: kworker/1:1 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
>   panic+0x29d/0x5f2 kernel/panic.c:214
>   __warn.cold+0x20/0x48 kernel/panic.c:571
>   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+0x130/0x1f0 arch/x86/kernel/traps.c:272
>   do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291
>   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
> RIP: 0010:zd_mac_clear+0xb0/0xe0
> drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
> Code: e8 85 d0 60 f8 48 8d bb f8 2b 00 00 be ff ff ff ff e8 54 5a 46 f8 31
> ff 89 c3 89 c6 e8 d9 d1 60 f8 85 db 75 d4 e8 60 d0 60 f8 <0f> 0b 5b 5d e9
> 57 d0 60 f8 48 c7 c7 58 05 cb 93 e8 fb e0 97 f8 eb
> RSP: 0018:ffff8880a85c7310 EFLAGS: 00010293
> RAX: ffff8880a84de200 RBX: 0000000000000000 RCX: ffffffff8910f507
> RDX: 0000000000000000 RSI: ffffffff8910f510 RDI: 0000000000000005
> RBP: 0000000000000001 R08: ffff8880a84de200 R09: ffffed1012f83a0b
> R10: ffffed1012f83a0a R11: ffff888097c1d057 R12: 00000000ffffffb9
> R13: ffff888097c18b20 R14: ffff888099456630 R15: ffffffff8f979398
>   probe+0x259/0x590 drivers/net/wireless/zydas/zd1211rw/zd_usb.c:1421
>   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
> Kernel Offset: disabled
> Rebooting in 86400 seconds..

This USB bug is the second most frequently triggered one with over 10k
kernel crashes.

>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: WARNING in zd_mac_clear
  2019-08-07 14:07 ` Andrey Konovalov
@ 2019-08-07 14:18   ` Oliver Neukum
  2019-08-07 14:24     ` Kalle Valo
  2019-08-07 14:58     ` syzbot
  0 siblings, 2 replies; 5+ messages in thread
From: Oliver Neukum @ 2019-08-07 14:18 UTC (permalink / raw)
  To: Andrey Konovalov, syzbot, USB list
  Cc: Kalle Valo, David S. Miller, Ulrich Kunitz, Daniel Drake,
	syzkaller-bugs, Alan Stern, LKML, linux-wireless, netdev

Am Mittwoch, den 07.08.2019, 16:07 +0200 schrieb Andrey Konovalov:
> On Fri, Apr 12, 2019 at 1:46 PM syzbot
> <syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com> wrote:
> > 
> > Hello,
> > 
> > syzbot found 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=101a06dd200000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
> > dashboard link: https://syzkaller.appspot.com/bug?extid=74c65761783d66a9c97c
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1170c22d200000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1496adbb200000
> > 
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com
> > 
> > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > usb 1-1: config 0 descriptor??
> > usb 1-1: reset low-speed USB device number 2 using dummy_hcd
> > usb 1-1: read over firmware interface failed: -71
> > usb 1-1: reset low-speed USB device number 2 using dummy_hcd
> > WARNING: CPU: 1 PID: 21 at drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
> > zd_mac_clear+0xb0/0xe0 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
> > Kernel panic - not syncing: panic_on_warn set ...
> > CPU: 1 PID: 21 Comm: kworker/1:1 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
> >   panic+0x29d/0x5f2 kernel/panic.c:214
> >   __warn.cold+0x20/0x48 kernel/panic.c:571
> >   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+0x130/0x1f0 arch/x86/kernel/traps.c:272
> >   do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291
> >   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
> > RIP: 0010:zd_mac_clear+0xb0/0xe0
> > drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
> > Code: e8 85 d0 60 f8 48 8d bb f8 2b 00 00 be ff ff ff ff e8 54 5a 46 f8 31
> > ff 89 c3 89 c6 e8 d9 d1 60 f8 85 db 75 d4 e8 60 d0 60 f8 <0f> 0b 5b 5d e9
> > 57 d0 60 f8 48 c7 c7 58 05 cb 93 e8 fb e0 97 f8 eb
> > RSP: 0018:ffff8880a85c7310 EFLAGS: 00010293
> > RAX: ffff8880a84de200 RBX: 0000000000000000 RCX: ffffffff8910f507
> > RDX: 0000000000000000 RSI: ffffffff8910f510 RDI: 0000000000000005
> > RBP: 0000000000000001 R08: ffff8880a84de200 R09: ffffed1012f83a0b
> > R10: ffffed1012f83a0a R11: ffff888097c1d057 R12: 00000000ffffffb9
> > R13: ffff888097c18b20 R14: ffff888099456630 R15: ffffffff8f979398
> >   probe+0x259/0x590 drivers/net/wireless/zydas/zd1211rw/zd_usb.c:1421
> >   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
> > Kernel Offset: disabled
> > Rebooting in 86400 seconds..
> 
> This USB bug is the second most frequently triggered one with over 10k
> kernel crashes.

As far as I can tell this is a false positive. Didn't I submit this
upstream?

#syz test: https://github.com/google/kasan.git 9a33b369

From ae999d5a437850b65497df7dcca3ffc10f75e697 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Tue, 30 Jul 2019 15:59:03 +0200
Subject: [PATCH] zdnet: remove false assertion from zd_mac_clear()

The function is called before the lock which is asserted was ever used.
Just remove it.

Reported-by: syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/zydas/zd1211rw/zd_mac.c b/drivers/net/wireless/zydas/zd1211rw/zd_mac.c
index da7e63fca9f5..a9999d10ae81 100644
--- a/drivers/net/wireless/zydas/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zydas/zd1211rw/zd_mac.c
@@ -223,7 +223,6 @@ void zd_mac_clear(struct zd_mac *mac)
 {
 	flush_workqueue(zd_workqueue);
 	zd_chip_clear(&mac->chip);
-	lockdep_assert_held(&mac->lock);
 	ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
 }
 
-- 
2.16.4


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: WARNING in zd_mac_clear
  2019-08-07 14:18   ` Oliver Neukum
@ 2019-08-07 14:24     ` Kalle Valo
  2019-08-07 14:58     ` syzbot
  1 sibling, 0 replies; 5+ messages in thread
From: Kalle Valo @ 2019-08-07 14:24 UTC (permalink / raw)
  To: Oliver Neukum
  Cc: Andrey Konovalov, syzbot, USB list, David S. Miller,
	Ulrich Kunitz, Daniel Drake, syzkaller-bugs, Alan Stern, LKML,
	linux-wireless, netdev

Oliver Neukum <oneukum@suse.com> writes:

> Am Mittwoch, den 07.08.2019, 16:07 +0200 schrieb Andrey Konovalov:
>> On Fri, Apr 12, 2019 at 1:46 PM syzbot
>> <syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com> wrote:
>> > 
>> > Hello,
>> > 
>> > syzbot found 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=101a06dd200000
>> > kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
>> > dashboard link: https://syzkaller.appspot.com/bug?extid=74c65761783d66a9c97c
>> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1170c22d200000
>> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1496adbb200000
>> > 
>> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> > Reported-by: syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com
>> > 
>> > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
>> > usb 1-1: config 0 descriptor??
>> > usb 1-1: reset low-speed USB device number 2 using dummy_hcd
>> > usb 1-1: read over firmware interface failed: -71
>> > usb 1-1: reset low-speed USB device number 2 using dummy_hcd
>> > WARNING: CPU: 1 PID: 21 at drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
>> > zd_mac_clear+0xb0/0xe0 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
>> > Kernel panic - not syncing: panic_on_warn set ...
>> > CPU: 1 PID: 21 Comm: kworker/1:1 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
>> >   panic+0x29d/0x5f2 kernel/panic.c:214
>> >   __warn.cold+0x20/0x48 kernel/panic.c:571
>> >   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+0x130/0x1f0 arch/x86/kernel/traps.c:272
>> >   do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291
>> >   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
>> > RIP: 0010:zd_mac_clear+0xb0/0xe0
>> > drivers/net/wireless/zydas/zd1211rw/zd_mac.c:238
>> > Code: e8 85 d0 60 f8 48 8d bb f8 2b 00 00 be ff ff ff ff e8 54 5a 46 f8 31
>> > ff 89 c3 89 c6 e8 d9 d1 60 f8 85 db 75 d4 e8 60 d0 60 f8 <0f> 0b 5b 5d e9
>> > 57 d0 60 f8 48 c7 c7 58 05 cb 93 e8 fb e0 97 f8 eb
>> > RSP: 0018:ffff8880a85c7310 EFLAGS: 00010293
>> > RAX: ffff8880a84de200 RBX: 0000000000000000 RCX: ffffffff8910f507
>> > RDX: 0000000000000000 RSI: ffffffff8910f510 RDI: 0000000000000005
>> > RBP: 0000000000000001 R08: ffff8880a84de200 R09: ffffed1012f83a0b
>> > R10: ffffed1012f83a0a R11: ffff888097c1d057 R12: 00000000ffffffb9
>> > R13: ffff888097c18b20 R14: ffff888099456630 R15: ffffffff8f979398
>> >   probe+0x259/0x590 drivers/net/wireless/zydas/zd1211rw/zd_usb.c:1421
>> >   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
>> > Kernel Offset: disabled
>> > Rebooting in 86400 seconds..
>> 
>> This USB bug is the second most frequently triggered one with over 10k
>> kernel crashes.
>
> As far as I can tell this is a false positive. Didn't I submit this
> upstream?
>
> #syz test: https://github.com/google/kasan.git 9a33b369
>
> From ae999d5a437850b65497df7dcca3ffc10f75e697 Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <oneukum@suse.com>
> Date: Tue, 30 Jul 2019 15:59:03 +0200
> Subject: [PATCH] zdnet: remove false assertion from zd_mac_clear()
>
> The function is called before the lock which is asserted was ever used.
> Just remove it.
>
> Reported-by: syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com
> Signed-off-by: Oliver Neukum <oneukum@suse.com>

Neither google nor patchwork[1] can find the patch. If you think the
patch should be applied, please resubmit it to linux-wireless so
patchwork sees it. Also the title prefix should be "zd1211rw:", not
"zdnet:".

[1] https://patchwork.kernel.org/project/linux-wireless/list/

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: WARNING in zd_mac_clear
  2019-08-07 14:18   ` Oliver Neukum
  2019-08-07 14:24     ` Kalle Valo
@ 2019-08-07 14:58     ` syzbot
  1 sibling, 0 replies; 5+ messages in thread
From: syzbot @ 2019-08-07 14:58 UTC (permalink / raw)
  To: andreyknvl, davem, dsd, kune, kvalo, linux-kernel, linux-usb,
	linux-wireless, netdev, oneukum, stern, syzkaller-bugs

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger  
crash:

Reported-and-tested-by:  
syzbot+74c65761783d66a9c97c@syzkaller.appspotmail.com

Tested on:

commit:         9a33b369 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10d8c03c600000

Note: testing is done by a robot and is best-effort only.

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, back to index

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-04-12 11:46 WARNING in zd_mac_clear syzbot
2019-08-07 14:07 ` Andrey Konovalov
2019-08-07 14:18   ` Oliver Neukum
2019-08-07 14:24     ` Kalle Valo
2019-08-07 14:58     ` syzbot

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