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        Wed, 11 Mar 2020 11:48:26 -0400
Subject: Re: [Bug 206175] Fedora >= 5.4 kernels instantly freeze on boot
 without producing any display output
To: Christoph Hellwig <hch@lst.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        iommu@lists.linux-foundation.org
References: <bug-206175-5873@https.bugzilla.kernel.org/>
 <bug-206175-5873-S6PaNNClEr@https.bugzilla.kernel.org/>
 <CAHk-=wi4GS05j67V0D_cRXRQ=_Jh-NT0OuNpF-JFsDFj7jZK9A@mail.gmail.com>
 <20200310162342.GA4483@lst.de>
 <CAHk-=wgB2YMM6kw8W0wq=7efxsRERL14OHMOLU=Nd1OaR+sXvw@mail.gmail.com>
 <20200310182546.GA9268@lst.de> <20200311152453.GB23704@lst.de>
 <e70dd793-e8b8-ab0c-6027-6c22b5a99bfc@gmx.com>
 <20200311154328.GA24044@lst.de>
From: "Artem S. Tashkinov" <aros@gmx.com>
Message-ID: <19498990-fb97-b739-cd19-6a6415ba88a2@gmx.com>
Date: Wed, 11 Mar 2020 15:48:21 +0000
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On 3/11/20 3:43 PM, Christoph Hellwig wrote:
> On Wed, Mar 11, 2020 at 03:34:38PM +0000, Artem S. Tashkinov wrote:
>> On 3/11/20 3:24 PM, Christoph Hellwig wrote:
>>> pdev->dma_mask =3D parent->dma_mask ? *parent->dma_mask : 0;
>>
>> This patch makes no difference.
>>
>> The kernel panics with the same call trace which starts with:
>
> This looks really strange and not dma mask related, but there must be
> some odd interactions somewhere.
>
> Can you call gdb on the vmlinux file for the 5.5.8-200.fc31 kernel
> in the jpg and then do
>
> l *(kmem_cache_alloc_trace+0x7e)
>
> l *(acpi_processor_add+0x3a)
>
> and send the output?
>

I'm not sure I can call or do anything because the system is dead and
I'm looking at the kernel panic message. The console is dead. The root
file system is not yet mounted. Initrd can't be loaded either. I have no
COM port/console. I have no debugging abilities whatsoever. I can only
compile kernels and try running them.