WARNING in zd_mac_clear

[syzbot]

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+74c657...@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 syzk...@googlegroups.com.

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syzbot can test patches for this bug, for details see:
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[Andrey Konovalov]

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

[Oliver Neukum]

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 <one...@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+74c657...@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <one...@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

[Kalle Valo]

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

[syzbot]

Hello,

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

Reported-and-tested-by:
syzbot+74c657...@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.