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From: Paul Gortmaker <paul.gortmaker@windriver.com>
To: "Michal Šmucr" <msmucr@gmail.com>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: Kenrel panic with 3.18.7-rt2 - rootfs at MMC
Date: Sun, 1 Mar 2015 20:25:24 -0500	[thread overview]
Message-ID: <CAP=VYLr=vMTRYCqoXcQBjrMT1-7dGp8fsThTYWzf=4L2tEYyyA@mail.gmail.com> (raw)
In-Reply-To: <54EC487F.8020109@gmail.com>

On Tue, Feb 24, 2015 at 4:46 AM, Michal Šmucr <msmucr@gmail.com> wrote:
> Hello to all,
>
> I'm getting kernel panics, when I'm using kernel 3.18.7 with recently
> released rt1 and rt2 patches. Platform is x86_64.
> It happens only when root filesystem is at SDHC card.
> At 3.14.31-rt28 or recent plain vanilla kernels I haven't spotted this
> issue.
>
> Boot panic is possible to workaround by adding kernel parameter:
> "scsi_mod.scan=sync", but it still happens during initrd rebuild using
> update-initramfs at Debian Jessie.
>
> Log from panic is attached.

Seems sdhci_irq is operating on a (non-raw) host->lock and you
are running that code in hard IRQ context, which will trigger the
alarm for operating on a sleeping lock while in atomic context.
(i.e code is not currently -rt friendly as-is).

>
> Thanks for any comment regarding issue or better way for bug-report,

In the future, putting the log lines in line (vs attachment) makes
it easier to reply and comment - meaning more people will look
at the report.

P.
--

>
> Michal
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  parent reply	other threads:[~2015-03-02  1:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-24  9:46 Kenrel panic with 3.18.7-rt2 - rootfs at MMC Michal Šmucr
2015-02-26 11:29 ` [RT PATCH] mmc: sdhci: don't provide hard irq handler Sebastian Andrzej Siewior
2015-02-27  9:33   ` Michal Šmucr
2015-03-02  1:25 ` Paul Gortmaker [this message]
2015-03-02  1:31   ` Kenrel panic with 3.18.7-rt2 - rootfs at MMC Paul Gortmaker
2015-03-02 11:43     ` Michal Šmucr
2015-03-02  3:34   ` Ralf Mardorf
2015-03-06 12:24     ` Sebastian Andrzej Siewior
2015-03-06 16:43 Ralf Mardorf

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