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

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Message-ID: <m2o6oe85fv.fsf@posteo.net>
Date: Thu, 04 Dec 2025 18:31:18 +0000
From: Charalampos Mitrodimas <charmitro@...teo.net>
To: syzbot <syzbot+e6a50a2e7cbb4f775d04@...kaller.appspotmail.com>
Cc: 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

syzbot <syzbot+e6a50a2e7cbb4f775d04@...kaller.appspotmail.com> writes:

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    7d31f578f323 Add linux-next specific files for 20251128
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=119c8192580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ec890b8333fce099
> 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
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17bdbcb4580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1413b0c2580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/9bcc6eb60940/disk-7d31f578.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/895bc1bfae48/vmlinux-7d31f578.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/48f15e4679f3/bzImage-7d31f578.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+e6a50a2e7cbb4f775d04@...kaller.appspotmail.com
>
> ------------[ 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#0: syz.0.17/6025
> Modules linked in:
> CPU: 0 UID: 0 PID: 6025 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:ffffc90003487820 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff8880726bb700 RCX: 0000000080000280
> RDX: ffff888071228200 RSI: ffffffff8c3575e0 RDI: ffffffff8fcf8fd0
> RBP: 1ffff1100e666078 R08: 00000000000000c0 R09: 0000000000000000
> R10: ffffc90003487920 R11: fffff52000690f30 R12: ffff888076835100
> R13: ffff8880733303c0 R14: 0000000080000280 R15: ffff888071228200
> FS:  00007fe073fd66c0(0000) GS:ffff888125a03000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000200000001480 CR3: 000000007ecd2000 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
>  dib0700_ctrl_rd drivers/media/usb/dvb-usb/dib0700_core.c:95 [inline]
>  dib0700_i2c_xfer_legacy drivers/media/usb/dvb-usb/dib0700_core.c:315 [inline]
>  dib0700_i2c_xfer+0xba7/0xf70 drivers/media/usb/dvb-usb/dib0700_core.c:361
>  __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: 0033:0x7fe07318f749
> 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:00007fe073fd6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007fe0733e5fa0 RCX: 00007fe07318f749
> RDX: 0000200000000200 RSI: 0000000000000707 RDI: 0000000000000004
> RBP: 00007fe073213f91 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007fe0733e6038 R14: 00007fe0733e5fa0 R15: 00007ffe02ef2178
>  </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
>
>
> ---
> This report 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@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup

#syz test: https://github.com/charmitro/linux.git f231ce51303079e1efe987fd83e04efa3b047988