linux-kernel - Re: [syzbot] [media?] BUG: corrupted list in az6007_i2c

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Message-ID: <68bb0760.a00a0220.eb3d.0017.GAE@google.com>
Date: Fri, 05 Sep 2025 08:53:04 -0700
From: syzbot <syzbot+0192952caa411a3be209@...kaller.appspotmail.com>
To: aha310510@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] BUG: corrupted list in az6007_i2c_xfer

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in az6007_identify_state

usb 2-1: config 0 descriptor??
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 10 at kernel/locking/mutex.c:577 __mutex_lock_common kernel/locking/mutex.c:577 [inline]
WARNING: CPU: 0 PID: 10 at kernel/locking/mutex.c:577 __mutex_lock+0x3a2/0x1060 kernel/locking/mutex.c:760
Modules linked in:
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:577 [inline]
RIP: 0010:__mutex_lock+0x3a2/0x1060 kernel/locking/mutex.c:760
Code: 08 84 d2 0f 85 7e 0c 00 00 44 8b 0d 78 89 1a 05 45 85 c9 75 19 90 48 c7 c6 20 57 ad 8b 48 c7 c7 60 56 ad 8b e8 ff 11 ea f5 90 <0f> 0b 90 90 90 e9 b5 fd ff ff 48 8d 85 60 ff ff ff 48 89 df 48 89
RSP: 0018:ffffc900000f6de0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888032d9c000 RCX: ffffffff817a2388
RDX: ffff88801e2c8000 RSI: ffffffff817a2395 RDI: 0000000000000001
RBP: ffffc900000f6f30 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 1ffff9200001edc8 R15: ffffffff8800f287
FS:  0000000000000000(0000) GS:ffff8881246e3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ac14aafab0 CR3: 000000007d1e6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 az6007_read drivers/media/usb/dvb-usb-v2/az6007.c:138 [inline]
 az6007_identify_state+0x97/0x310 drivers/media/usb/dvb-usb-v2/az6007.c:865
 dvb_usbv2_probe+0x4cc/0x3e50 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:947
 usb_probe_interface+0x300/0xa40 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa90 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031
 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
 device_add+0x1148/0x1aa0 drivers/base/core.c:3689
 usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x3e0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa90 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031
 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
 device_add+0x1148/0x1aa0 drivers/base/core.c:3689
 usb_new_device+0xd07/0x1a60 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2f34/0x4fe0 drivers/usb/core/hub.c:5952
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


Tested on:

commit:         d69eb204 Merge tag 'net-6.17-rc5' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=112dc962580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2b271b97d244fd0a
dashboard link: https://syzkaller.appspot.com/bug?extid=0192952caa411a3be209
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12c9c962580000