From: Jarkko Sakkinen <jarkko@kernel.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Jerry Snitselaar <jsnitsel@redhat.com>,
Matthew Garrett <mjg59@google.com>,
linux-integrity <linux-integrity@vger.kernel.org>,
James Bottomley <James.Bottomley@hansenpartnership.com>
Subject: Re: Recent tpm_tis IRQ handling changes are causing kernel backtraces
Date: Tue, 15 Jun 2021 16:01:03 +0300 [thread overview]
Message-ID: <20210615130103.sln2s6hq4fkufi5a@kernel.org> (raw)
In-Reply-To: <5680899e-9040-7641-e6ac-23edd2d988cf@redhat.com>
On Mon, Jun 14, 2021 at 03:33:33PM +0200, Hans de Goede wrote:
> Hi,
>
> On 6/1/21 6:04 PM, Hans de Goede wrote:
> > Hi,
> >
> > On 5/31/21 6:36 AM, Jarkko Sakkinen wrote:
> >>> Interestingly enough the first backtrace is also happening on a:
> >>> "Dell Inc. XPS 13 9310/0MRT12, BIOS 2.2.0 04/06/2021"
> >>>
> >>> So it seems that at least with 5.12.6 (which has the last 2 fixes)
> >>> all reports are about the XPS 13 9310. I wonder if there is an
> >>> issue with the TPM interrupt line on the XPS 13 9310; I've asked the
> >>> reporters to try adding tpm_tis.interrupts=0 to their kernel commandline.
> >>
> >> This is helpful for sure that these all are happening on matching hardware.
> >
> > So our kernel-backtrace tracking info (ABRT) just recorded a third backtrace
> > with a kernel >= 5.12.6, again on the XPS 13 9310, so now we have 3 variants:
> >
> > 1. Backtrace starting with a call to ima_add_boot_aggregate
> > https://bugzilla.redhat.com/show_bug.cgi?id=1963712
> >
> > 2. Backtrace starting with a call to tpm_dev_async_work:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1964974
> > (note this one is not easily reproducible)
> >
> > 3. Backtrace starting with a call to rng_dev_read:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1920510
> >
> > 3. is the new one. All bugs linked above are public, all 3 backtraces
> > so far have only been reported on the XPS 13 9310 (with kernel >= 5.12.6)
> > and I've asked all the reporters to check if tpm_tis.interrupts=0 helps.
>
> Quick status update, I've got a response from a XPS 13 9310 user in:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1920510
>
> Indicating that a. he can reproduce this with the latest >= 5.12.6 kernels;
> and b. it goes away when specifying tpm_tis.interrupts=0 as I expected
> (I expected this because all the bug-reports started when the interrupt
> code got fixed/re-enabled a while ago).
>
> Si I think that there just is something broken wrt the interrupt setup
> on the XPS 13 9310 and that we should probably add an antry for the
> XPS 13 9310 to the already existing tpm_tis_dmi_table pointing to the
> also already existing tpm_tis_disable_irq callback.
>
> If other people agree that that is probably the best way forward ?
> then I can prepare a patch and ask the user to test this.
>
> Regards,
>
> Hans
I think it all roots down to the use of TPM before tpm2_probe(), i.e.
TPM is not in expected state when tpm_chip_start() is called. I
suggested to try out adding tpm_chip_stop() right before
tpm_chip_start() in another response.
That's only thing that makes logically sense to me at least.
/Jarkko
next prev parent reply other threads:[~2021-06-15 13:01 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 13:09 Recent tpm_tis IRQ handling changes are causing kernel backtraces Hans de Goede
2021-03-16 15:34 ` Hans de Goede
2021-03-16 19:18 ` Jarkko Sakkinen
2021-05-08 9:07 ` Hans de Goede
2021-05-10 17:25 ` Jarkko Sakkinen
2021-05-11 8:37 ` Hans de Goede
2021-05-11 23:48 ` Jarkko Sakkinen
2021-05-26 19:03 ` Hans de Goede
2021-05-27 14:00 ` Jarkko Sakkinen
2021-05-27 15:27 ` Hans de Goede
[not found] ` <20210531043616.u3v25qzkkrik5apq@kernel.org>
2021-05-31 8:24 ` Hans de Goede
2021-06-01 18:02 ` Jarkko Sakkinen
2021-06-01 16:04 ` Hans de Goede
2021-06-01 18:03 ` Jarkko Sakkinen
2021-06-14 13:33 ` Hans de Goede
2021-06-15 13:01 ` Jarkko Sakkinen [this message]
2021-06-15 13:59 ` Hans de Goede
2021-06-23 13:37 ` Jarkko Sakkinen
2021-06-21 12:04 ` Hans de Goede
2021-06-23 13:40 ` Jarkko Sakkinen
2021-06-23 13:54 ` Hans de Goede
2021-06-29 18:04 ` Recent tpm_tis IRQ handling changes are causing kernel backtraces] Jarkko Sakkinen
2021-06-29 19:14 ` Hans de Goede
2021-06-29 22:05 ` Jarkko Sakkinen
2021-06-30 12:47 ` Hans de Goede
2021-06-30 13:36 ` Hans de Goede
2021-07-09 18:44 ` Jarkko Sakkinen
2021-07-17 16:10 ` Hans de Goede
2021-07-27 2:50 ` Jarkko Sakkinen
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