Package: src:linux
Version: 5.14.6-2
Severity: important
X-Debbugs-Cc: debian-sp...@lists.debian.org
Dear Maintainer,
Debian kernels > 5.14.3-1~exp1 consistently fail to boot on SPARC T4-1:
SPARC T4-1, No Keyboard
Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
OpenBoot 4.36.2, 31.5000 GB memory available, Serial #108045182.
Ethernet address 0:10:e0:70:a3:7e, Host ID: 8670a37e.
Boot device: disk0 File and args:
SILO Version 1.4.14
boot:
Allocated 64 Megs of memory at 0x4000 for kernel
Uncompressing image...
Loaded kernel version 5.14.6
Loading initial ramdisk (25723814 bytes at 0x2480 phys, 0x40C0 virt)...
ERROR: Last Trap: Fast Data Access MMU Miss
Debian kernels 5.14.3-1~exp1 and earlier boot and run successfully on this
system.
I have tried the sparc64-smp packages built by buildd landau for these versions:
5.14.6-2, 5.14.6-3, 5.14.9-2, 5.15.5-2, 5.15.15-1, 5.16~rc8-1~exp1
They all consistently fail to boot with the same error.
I have built the Debian src pkg version 5.14.6-1 using pbuilder with a sid
basetgz.
It consistently fails to boot with the same error.
I've then tried to bisect using the DebianKernel/GitBisect instructions on the
Debian wiki,
but it turns out that kernels built from git (tag v5.14.3, tag v5.14.6, and ~9
bisects in between)
using make bindeb-pkg all do boot successfully on this system.
I've tried checking out tag v5.14.6 from git, then applying all the patches
from debian/patches
in the 5.14.6-1 src pkg and building using make bindeb-pkg. The resulting
kernel boots successfully.
I've tried extracting the 5.14.6-1 src pkg using dpkg-source -x, then building
using make bindeb-pkg
and the resulting kernel boots succesfully. But if I build using
dpkg-buildpackage like pbuilder does,
then the resulting -sparc64-smp package fails to boot with the above error.
When building, I have used each time a clean sid changeroot. When using make
bindeb-pkg I have copied
the config installed in /boot by the (non-booting) 5.14.6-1 Debian package then
done make olddefconfig.
When using make bindeb-pkg I had to manually disable stringop-overread warnings
in Makefile to avoid
build failure on arch/sparc/kernel/mdesc.c with v5.14.6 (fixed in later
versions by [1]).
When building using bindeb-pkg the resulting kernel is compressed; when using
dpkg-buildpackage the
resulting kernel is uncompressed. I have tried both uncompressing the
compressed kernel and compressing
the uncompressed kernel, as silo supports both. It doesn't affect the results.
Uncompressed, the Debian
kernel is ~17MB while the standard kernel is ~13MB. I'm not sure why this
difference is there.
On Debian salsa's kernel-team/linux I have combed through all the commits
between tags debian/5.14.3-1_exp1
and debian/5.14.6-1, but none of them seem relevant to this issue. I have
checked the upstream changelog
between v5.14.3 and v5.14.6, but nothing sparc-specific has changed.
According to the buildd logs, landau is running kernel 5.15.5-2. But I think
this is a SPARC-T5 so not
a T4, and I think it's running inside an LDOM which is not the case on my T4,
so it may not be comparable.
I've also tried to get more information about the failure, but I don't know how
to do that. I've tried
to get into the initramfs environment by using break=premount/modules/top, but
the failure happens before
those stages. Measuring the elapsed time after Loading initial ramdisk it would
seem the error message
ERROR: Last Trap: Fast Data Access MMU Miss appears when normally the first
kernel output would appear.
I've tried to look into what the Debian src pkg's debian/* scripts do, exactly,
but this is rather
complicated and I have limited experience with it.
Any suggestions what else I could try?
[1]:
https://github.com/gregkh/linux/commit/fc7c028dcdbfe981bca75d2a7b95f363eb691ef3
-- Package-specific info:
** Kernel log: boot messages should be attached
** Model information
cpu : UltraSparc T4 (Niagara4)
fpu : UltraSparc T4 integrated FPU
pmu : niagara4
prom: OBP 4.36.2 2014/10/24 08:13
type: sun4v
** Network interface configuration:
*** /etc/network/interfaces:
source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
auto br0
iface br0 inet static
bridge_ports enp15s0f0
bridge_fd 0
address x.x.x.x
netmask x.x.x.x
gateway x.x.x.x
iface enp15s0f0 inet manual
** PCI devices:
00:01.0 PCI bridge [0604]: Oracle/SUN Device [108e:8186] (rev 01) (prog-if 00
[Normal decode])
Device tree node: /sys/firmware/devicetree/base/pci@400/pci@1
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities:
00:02.0 PCI bridge [0604]: Oracle/SUN Device
