Re: [Bug 219349] New: RIP: 0010:pci_for_each_dma_alias (./include/linux/pci.h:692 drivers/pci/search.c:41)

[Bjorn Helgaas <helgaas@kernel.org>]

On Mon, Oct 07, 2024 at 12:20:01PM -0500, Bjorn Helgaas wrote:
> On Fri, Oct 04, 2024 at 07:55:29AM +0200, Marcin Mirosław wrote:
> > W dniu 03.10.2024 o 23:39, Bjorn Helgaas pisze:
> > > On Thu, Oct 03, 2024 at 08:15:16PM +0000, bugzilla-daemon@kernel.org wrote:
> > > > https://bugzilla.kernel.org/show_bug.cgi?id=219349
> > > > 
> > > >             Summary: RIP: 0010:pci_for_each_dma_alias
> > > >                      (./include/linux/pci.h:692 drivers/pci/search.c:41)
> > > >      Kernel Version: 6.12.0-rc1  8c245fe7dde3
> > > >          Regression: Yes
> > > > 
> > > > Created attachment 306959
> > > >    --> https://bugzilla.kernel.org/attachment.cgi?id=306959&action=edit
> > > > lspci -vv
> > > > 
> > > > Hello,
> > > > I see BUG: kernel NULL pointer dereference using kernel 6.12.0-rc1 (actually at
> > > > 8c245fe7dde3 but don't know what is first bad commit).
> > > 
> > > Thanks very much for this report!  You marked this as a regression;
> > > Marcin, do you know the most recent kernel where you did not see this
> > > issue?
> > 
> > Kernel 6.11 works correctly, I didn't narrow suspect commit yet.
> 
> Update from the bugzilla:
> 
> Marcin bisected the problem to 2031c469f816 ("iommu/vt-d: Add support
> for static identity domain") and verified that reverting that commit
> from v6.12-rc2 avoids the problem.

#regzbot introduced: 2031c469f816 ("iommu/vt-d: Add support for static identity domain")