From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Mike Galbraith <efault@gmx.de>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>,
gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
Hans de Goede <hdegoede@redhat.com>, Li Jun <jun.li@nxp.com>
Subject: Re: [PATCH 3/3] xhci: Don't create stream debugfs files with spinlock held.
Date: Thu, 29 Oct 2020 11:37:00 +0100 [thread overview]
Message-ID: <20201029103700.eqvumc7wgqjwrbvw@linutronix.de> (raw)
In-Reply-To: <127927cb3ae3178de36653a47f99f7466ee33b20.camel@gmx.de>
On 2020-10-29 11:23:25 [+0100], Mike Galbraith wrote:
> Below, the aforementioned 5.10-rt splat in case that helps.
>
> [ 155.051826] CPU0 CPU1
> [ 155.051826] ---- ----
> [ 155.051826] lock(&xhci->lock);
> [ 155.051827] lock((softirq_ctrl.lock).lock);
> [ 155.051828] lock(&xhci->lock);
> [ 155.051828] lock((lock).lock);
> [ 155.051829]
no, that is yet again different. Based on these lines the reason is most
likely the same as in net/TCP you reported a few releases ago (RT
specific).
I need to consult core & locking overlords to figure out how we deal
with this in future since is seems this cases pop up in packs.
If you have more lockdep reports with softirq_ctrl.lock involved, please
throw them at me.
Sebastian
next prev parent reply other threads:[~2020-10-29 10:37 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-28 20:31 [PATCH 0/3] xhci fixes for usb-linus Mathias Nyman
2020-10-28 20:31 ` [PATCH 1/3] xhci: Fix sizeof() mismatch Mathias Nyman
2020-10-28 20:31 ` [PATCH 2/3] usb: xhci: Workaround for S3 issue on AMD SNPS 3.0 xHC Mathias Nyman
2020-10-28 20:31 ` [PATCH 3/3] xhci: Don't create stream debugfs files with spinlock held Mathias Nyman
2020-10-29 6:03 ` Mike Galbraith
2020-10-29 9:41 ` Mathias Nyman
2020-10-29 9:42 ` Sebastian Andrzej Siewior
2020-10-29 10:23 ` Mike Galbraith
2020-10-29 10:37 ` Sebastian Andrzej Siewior [this message]
2020-10-29 11:11 ` Mike Galbraith
2020-10-29 11:22 ` Mathias Nyman
2020-10-29 11:38 ` Sebastian Andrzej Siewior
2020-10-29 12:44 ` Jun Li
2020-10-29 13:08 ` Mathias Nyman
2020-10-29 15:10 ` Sebastian Andrzej Siewior
2020-10-29 16:26 ` David Laight
2020-10-29 17:43 ` Sebastian Andrzej Siewior
2020-10-30 8:01 ` Jun Li
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