linux-kernel - Re: [syzbot] [usb?] WARNING in usb_start_wait

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Message-ID: <6931f561.a70a0220.2ea503.00e7.GAE@google.com>
Date: Thu, 04 Dec 2025 12:56:01 -0800
From: syzbot <syzbot+e6a50a2e7cbb4f775d04@...kaller.appspotmail.com>
To: charmitro@...teo.net, gregkh@...uxfoundation.org, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] WARNING in usb_start_wait_urb

Hello,

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

------------[ cut here ]------------
usb 1-1: BOGUS control dir, pipe 80000280 doesn't match bRequestType c0
WARNING: drivers/usb/core/urb.c:414 at 0x0, CPU#1: syz.0.17/6455
Modules linked in:
CPU: 1 UID: 0 PID: 6455 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:usb_submit_urb+0x111c/0x18d0 drivers/usb/core/urb.c:412
Code: b8 00 00 00 00 00 fc ff df 0f b6 44 05 00 84 c0 0f 85 a7 05 00 00 45 0f b6 45 00 48 8b 3c 24 48 8b 74 24 20 4c 89 fa 44 89 f1 <67> 48 0f b9 3a 49 bf 00 00 00 00 00 fc ff df e9 b7 f2 ff ff 89 e9
RSP: 0018:ffffc90003f1f800 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88807523df00 RCX: 0000000080000280
RDX: ffff8881404becc0 RSI: ffffffff8c35e540 RDI: ffffffff8fd058d0
RBP: 1ffff110287ec848 R08: 00000000000000c0 R09: 0000000000000000
R10: ffffc90003f1f900 R11: fffff520007e3f2c R12: ffff88807d6a5100
R13: ffff888143f64240 R14: 0000000080000280 R15: ffff8881404becc0
FS:  00007f80746386c0(0000) GS:ffff888125af0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558e2419d738 CR3: 000000007303a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 usb_start_wait_urb+0x115/0x4f0 drivers/usb/core/message.c:59
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154
 dtv5100_i2c_msg+0x231/0x2f0 drivers/media/usb/dvb-usb/dtv5100.c:65
 dtv5100_i2c_xfer+0x269/0x3c0 drivers/media/usb/dvb-usb/dtv5100.c:86
 __i2c_transfer+0x871/0x2110 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x25b/0x3a0 drivers/i2c/i2c-core-base.c:2317
 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
 i2cdev_ioctl+0x64b/0x820 drivers/i2c/i2c-dev.c:467
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f807378f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8074638038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f80739e5fa0 RCX: 00007f807378f749
RDX: 0000200000000240 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 00007f8073813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f80739e6038 R14: 00007f80739e5fa0 R15: 00007ffc05fa7018
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(bad)
   8:	df 0f                	fisttps (%rdi)
   a:	b6 44                	mov    $0x44,%dh
   c:	05 00 84 c0 0f       	add    $0xfc08400,%eax
  11:	85 a7 05 00 00 45    	test   %esp,0x45000005(%rdi)
  17:	0f b6 45 00          	movzbl 0x0(%rbp),%eax
  1b:	48 8b 3c 24          	mov    (%rsp),%rdi
  1f:	48 8b 74 24 20       	mov    0x20(%rsp),%rsi
  24:	4c 89 fa             	mov    %r15,%rdx
  27:	44 89 f1             	mov    %r14d,%ecx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  36:	fc ff df
  39:	e9 b7 f2 ff ff       	jmp    0xfffff2f5
  3e:	89 e9                	mov    %ebp,%ecx


Tested on:

commit:         f231ce51 media: dvb-usb: dib0700: fix zero-length cont..
git tree:       https://github.com/charmitro/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=122b301a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b9f785244b836412
dashboard link: https://syzkaller.appspot.com/bug?extid=e6a50a2e7cbb4f775d04
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.