linux-kernel - Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

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Message-ID: <9f8bab1d-5f60-c962-3789-1b5ed8767076@bell.net>
Date:   Thu, 5 Jan 2023 14:51:06 -0500
From:   Matt Fagnani <matt.fagnani@...l.net>
To:     Vasant Hegde <vasant.hegde@....com>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     Joerg Roedel <jroedel@...e.de>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

I booted 6.2-rc2 + the patch four times with early kdump enabled and 
panicked the kernel. There weren't any kdump or dmesg files saved to 
/var/crash though. Nothing showed up in the journal from boots where the 
problem happened. The amdgpu crash happened before systemd-journald 
started from what I could tell. I tried to rebuild 
/boot/initramfs-6.2.0-rc2+kdump.img with amd_iommu=off added to the 
kernel command line with dracut, but an error that the kdumpbase module 
couldn't be found was shown. I read that a different dump capture kernel 
could be used with kdump, but I haven't figured out how to use that with 
early kdump yet. If anyone has ideas how to get the kdump and dmesg log, 
let me know. Thanks.