linux-kernel - Re: [syzbot] [kernel?] INFO: task hung in uevent

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Message-ID: <43189e93-2cad-429a-a604-15bf5cc95e43@I-love.SAKURA.ne.jp>
Date: Thu, 10 Jul 2025 00:33:00 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Alan Stern <stern@...land.harvard.edu>
Cc: syzbot <syzbot+592e2ab8775dbe0bf09a@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        USB list <linux-usb@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [syzbot] [kernel?] INFO: task hung in uevent_show (2)

On 2025/07/10 0:19, Alan Stern wrote:
> On Wed, Jul 09, 2025 at 11:44:46PM +0900, Tetsuo Handa wrote:
>> On 2025/07/09 23:27, Alan Stern wrote:
>>> Which of these three BUG_ON's did you hit, and where did you hit it?
>>
>> kernel BUG at ./include/linux/usb.h:1990!
>>
>> matches the BUG_ON(endpoint > 0xF) line. The location is shown below.
>>
>> Call Trace:
>>  <TASK>
>>  hub_configure drivers/usb/core/hub.c:1717 [inline]
>>  hub_probe+0x2300/0x3840 drivers/usb/core/hub.c:2005
> 
> Those line numbers are completely different from the code I have.  For 
> example, line 2005 in hub.c is part of the hub_ioctl() function, not 
> hub_probe().
> 
> Exactly what version of the kernel source are you using for your test?

It is current linux.git tree.

  https://elixir.bootlin.com/linux/v6.16-rc5/source/drivers/usb/core/hub.c#L1717
  https://elixir.bootlin.com/linux/v6.16-rc5/source/drivers/usb/core/hub.c#L2005

commit:         73392339 Merge tag 'pwm/for-6.16-rc6-fixes' of git://g..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=f481202e4ff2d138
dashboard link: https://syzkaller.appspot.com/bug?extid=592e2ab8775dbe0bf09a
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13f27f70580000