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Subject: Re: Kernel 6.5-rc2: system crash on suspend bisected
To:     "Michael S. Tsirkin" <mst@redhat.com>,
        Bjorn Helgaas <helgaas@kernel.org>
Cc:     imammedo@redhat.com, bhelgaas@google.com,
        LKML <linux-kernel@vger.kernel.org>, linux-pci@vger.kernel.org,
        regressions@lists.linux.dev,
        "Linux regression tracking #adding (Thorsten Leemhuis)" 
        <regressions@leemhuis.info>,
        Woody Suwalski <terraluna977@gmail.com>
References: <11fc981c-af49-ce64-6b43-3e282728bd1a@gmail.com>
 <20230720202110.GA544761@bhelgaas>
 <20230727020621-mutt-send-email-mst@kernel.org>
From:   Woody Suwalski <terraluna977@gmail.com>
Message-ID: <1d51d250-9524-33c5-9b3a-af8c33582eee@gmail.com>
Date:   Thu, 27 Jul 2023 08:07:23 -0400
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Michael S. Tsirkin wrote:
> On Thu, Jul 20, 2023 at 03:21:10PM -0500, Bjorn Helgaas wrote:
>> [+cc regressions list]
>>
>> On Wed, Jul 19, 2023 at 11:36:51PM -0400, Woody Suwalski wrote:
>>> Laptop shows a kernel crash trace after a first suspend to ram, on a second
>>> attempt to suspend it becomes frozen solid. This is 100% repeatable with a
>>> 6.5-rc2 kernel, not happening with a 6.4 kernel - see the attached dmesg
>>> output.
>>>
>>> I have bisected the kernel uilds and it points to :
>>> [40613da52b13fb21c5566f10b287e0ca8c12c4e9] PCI: acpiphp: Reassign resources
>>> on bridge if necessary
>>>
>>> Reversing this patch seems to fix the kernel crash problem on my laptop.
>> Thank you very much for all your work debugging, bisecting, and
>> reporting this!  This is incredibly helpful.
>>
>> Original report, including complete dmesg logs for both v6.4 and
>> v6.5-rc2:
>> https://lore.kernel.org/r/11fc981c-af49-ce64-6b43-3e282728bd1a@gmail.com
>>
>> I queued up a revert of 40613da52b13 ("PCI: acpiphp: Reassign
>> resources on bridge if necessary") (on my for-linus branch for v6.5).
>>
>> It looks like a NULL pointer dereference; hopefully the fix is obvious
>> and I can drop the revert and replace it with the fix.
>>
>> Bjorn
> Patch on list now:
> https://lore.kernel.org/all/20230726123518.2361181-1-imammedo%40redhat.com
Confirm works OK.
--
Tested-by: Woody Suwalski <terraluna977@gmail.com>
--

Thanks, Woody