From: Michal Pecio <michal.pecio@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: syzbot <syzbot+fd7be5ad9795b7f29df3@syzkaller.appspotmail.com>,
dakr@kernel.org, driver-core@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
rafael@kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [usb?] INFO: task hung in unbind_store
Date: Thu, 27 Aug 2026 11:08:03 +0200 [thread overview]
Message-ID: <20260827110803.49790ae3.michal.pecio@gmail.com> (raw)
In-Reply-To: <20260827110006.66b07ea4.michal.pecio@gmail.com>
On Thu, 27 Aug 2026 11:00:06 +0200, Michal Pecio wrote:
> And something is also wrong with those timeouts, because 20 times 5s
> should still be less than 143 s. I asked Syzbot to try 500ms instead,
> which ended up being over 3s in practice:
>
> [ 566.662036][ T6636] usb 4-1: sisusb_send_bulk_msg()
> [ 569.717341][ T6636] usb 4-1: sisusb_send_bulk_msg()
> [ 572.777761][ T6636] usb 4-1: sisusb_send_bulk_msg()
> [ 575.845365][ T6636] usb 4-1: sisusb_send_bulk_msg()
>
> Same on my system, but patch below reduces the timeout to 500ms.
>
> I have no idea what's happening here. Looks like a bug?
> Is it known that jiffies are totally unreliable like that?
Sorry for the noise, timeouts are 500ms as inteneded but the function
tries 6 times, which makes it 3 seconds.
next prev parent reply other threads:[~2026-08-27 9:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-23 11:40 syzbot
2026-08-23 11:46 ` Greg KH
2026-08-23 14:40 ` Alan Stern
2026-08-23 17:28 ` Greg KH
2026-08-24 0:29 ` Alan Stern
2026-08-27 9:00 ` Michal Pecio
2026-08-27 9:08 ` Michal Pecio [this message]
2026-08-26 14:51 ` syzbot
2026-08-27 6:02 ` Michal Pecio
2026-08-27 7:44 ` syzbot
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