Package: dpkg
Version: 1.21.22
Severity: important
X-Debbugs-Cc: [email protected]

Dear Maintainer,
while upgrading Debian 11 to 12 on PowerEdge 860 server, it rebooted suddenly.
All attempts to continue upgrade ended with reboots.

Tracked it down to dpkg. Running dpkg-deb -c on some packages causes immediate
reboot, e.g.:
firmware-misc-nonfree_20230210-5_all.deb
intel-microcode_3.20251111.1~deb12u1_amd64.deb

Tried various dpkg versions (from snapshot.debian.org). The first bad version
is 1.21.13. I suspect that it's caused by multithread liblzma decompression
support that was enabled in this version but haven't confirmed that.

Looks like a HW problem - but WTF? CPU bug? The server is:
DELL PowerEdge 860, 2GB RAM, Xeon 3050 (dual core), SAS 5/iR RAID

It was running all Debian versions from 5 to 11 without any problems.
Now it's running 12 with dpkg 1.20.13 from Debian 11. No other problems.

We're running Debian 12 on many other servers without any problems, including
another PowerEdge 860 (but only 1 GB RAM, Celeron D, no HW RAID).

-- Package-specific info:
System tainted due to merged-usr-via-aliased-dirs.

-- System Information:
Debian Release: 12.13
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 
'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-42-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dpkg depends on:
ii  libbz2-1.0   1.0.8-5+b1
ii  libc6        2.36-9+deb12u13
ii  liblzma5     5.4.1-1
ii  libselinux1  3.4-1+b6
ii  tar          1.34+dfsg-1.2+deb12u1
ii  zlib1g       1:1.2.13.dfsg-1

dpkg recommends no packages.

Versions of packages dpkg suggests:
ii  apt            2.6.1
pn  debsig-verify  <none>

-- no debconf information

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