Re: Recent tpm_tis IRQ handling changes are causing kernel backtraces

[Jarkko Sakkinen <jarkko@kernel.org>]

On Tue, Jun 01, 2021 at 06:04:40PM +0200, 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.
> 
> Regards,
> 
> Hans

I'll put myself watcher for each of these once I have the account, thank
you (will take tomorrow, it's 9PM atm).


/Jarkko