On 15/04/2026 16:44, Salvatore Bonaccorso wrote:
Control: tags -1 + moreinfo upstream
Hi Amit,
On Mon, Apr 13, 2026 at 12:19:05AM +0100, Amit Gurdasani wrote:
Package: src:linux
Version: 6.19.11-1
Severity: important
Tags: upstream
Dear Maintainer,
On booting the packaged 6.19.8 and 6.19.11 Debian amd64 kernels on
my desktop, there is a hang during early boot in the initramfs as
systemd-udevd enumerates devices. This ends up timing out after ~100
seconds, and the system never comes up properly (though there might
be another aspect to that, as device-mapper fails to map a number of
LVM volumes, I am investigating that issue separately).
systemd-udevd ends up in unkillable sleep, something also evidenced
by kernel messages indicating that the udev-worker task remains
blocked. It appears the issue originates from the amdgpu driver
(also evidenced in the kernel task blocked messages).
I checked, and the issue is present in the upstream Linux kernel as
well. I was able to use git bisect to pinpoint the commit from which
the issue is exhibited (between 6.18.0-rc2 and 6.18.0-rc3):
git bisect start
# status: waiting for both good and bad commits
# good: [7d0a66e4bb9081d75c82ec4957c50034cb0ea449] Linux 6.18
git bisect good 7d0a66e4bb9081d75c82ec4957c50034cb0ea449
# status: waiting for bad commit, 1 good commit known
# bad: [05f7e89ab9731565d8a62e3b5d1ec206485eeb0b] Linux 6.19
git bisect bad 05f7e89ab9731565d8a62e3b5d1ec206485eeb0b
# bad: [02892f90a9851f508e557b3c75e93fc178310d5f] Merge tag 'hwmon-for-v6.19'
of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
git bisect bad 02892f90a9851f508e557b3c75e93fc178310d5f
# good: [8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88] Merge tag 'net-next-6.19' of
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
git bisect good 8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88
# bad: [0692602defb0c273f80dec9c564ca50726404aca] Merge tag
'amd-drm-next-6.19-2025-12-02' of https://gitlab.freedesktop.org/agd5f/linux
into drm-next
git bisect bad 0692602defb0c273f80dec9c564ca50726404aca
# good: [8f037e11d070a38d143b85d72d369190514dca99] Merge tag
'drm-intel-next-2025-11-04' of https://gitlab.freedesktop.org/drm/i915/kernel
into drm-next
git bisect good 8f037e11d070a38d143b85d72d369190514dca99
# good: [f88f3575bc9099395232fa85da91c51f2861d582] Merge tag
'drm-intel-next-2025-11-14' of https://gitlab.freedesktop.org/drm/i915/kernel
into drm-next
git bisect good f88f3575bc9099395232fa85da91c51f2861d582
# bad: [ee31621316cc20108eb2075de5d57f2cbd295677] Merge tag
'drm-msm-next-2025-11-18' of https://gitlab.freedesktop.org/drm/msm into
drm-next
git bisect bad ee31621316cc20108eb2075de5d57f2cbd295677
# good: [77b686f688126a5f758b51441a03186e9eb1b0f1] gpu: nova-core: make
formatting compatible with rust tree
git bisect good 77b686f688126a5f758b51441a03186e9eb1b0f1
# bad: [ccd3b4c7c37fbbd3e5244d3c54ca24ae0a37810d] drm/amdgpu: Use amdgpu by
default on SI dedicated GPUs (v2)
git bisect bad ccd3b4c7c37fbbd3e5244d3c54ca24ae0a37810d
# good: [af2e61d61b127300f48609bf06e69643aab1c5ef] drm/amd/pm: Enable ppt1 caps
for smu_v13_0_12
git bisect good af2e61d61b127300f48609bf06e69643aab1c5ef
# good: [53cc70f8f143d62341b7653e829e6d2af04946dd] drm/amd/pm/si: Hook up VCE1
to SI DPM
git bisect good 53cc70f8f143d62341b7653e829e6d2af04946dd
# bad: [f1a2cd427d0401c1888c04613fb18d272825a5c2] drm/amdgpu: Refactor sriov
xgmi topology filling to common code
git bisect bad f1a2cd427d0401c1888c04613fb18d272825a5c2
# bad: [43d08222adf70f6b3ff6ded8dd8e8e4ed3ceff05] drm/amdgpu: Avoid xgmi
register access
git bisect bad 43d08222adf70f6b3ff6ded8dd8e8e4ed3ceff05
# bad: [baefc7cdac82e39fac31818ecc799a6b9b14a312] drm/amdgpu/vce1: Workaround
PLL timeout on FirePro W9000
git bisect bad baefc7cdac82e39fac31818ecc799a6b9b14a312
# bad: [eabc71661f01c74e5da3182b268170626e8bd290] drm/amdgpu/vce1: Enable VCE1
on Tahiti, Pitcairn, Cape Verde GPUs
git bisect bad eabc71661f01c74e5da3182b268170626e8bd290
# first bad commit: [eabc71661f01c74e5da3182b268170626e8bd290] drm/amdgpu/vce1:
Enable VCE1 on Tahiti, Pitcairn, Cape Verde GPUs
Thanks for doing this bisect work. Can you please report the issue to
https://gitlab.freedesktop.org/drm/amd/-/issues and then report back
here the issue reference as well for further tracking?
Regards,
Salvatore
Hello,
I searched for the issue on the amdgpu GitLab issue tracker and didn't
find it already reported. I've reported the issue as
https://gitlab.freedesktop.org/drm/amd/-/work_items/5199 .
Thanks,
Amit
