Package: intel-microcode
Version: 3.20250512.1~deb11u1
Severity: critical
Justification: breaks the whole system
X-Debbugs-Cc: bugs.debian.org@ayke-halder.de

Dear Maintainer,

after installation of intel-microcode 3.20250512.1~deb11u1 on a Dell T5600 with dual Intel Xeon E5-2660 the system becomes totally unbootable on kernel 6.1.0-0.deb11.21-amd64:

``
0.921425] Kernel panic - not syncing: UFS: Unable to mount root fs on unknown- block(0,0)
0.921462] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.1.0-0.deb11.21-amd64 #1 Debian 6.1.90-1~bpo11+1
0.921495] Hardware name: Dell Inc. Precision T5600/XXXXX, BIOS A19 06/30/2019 0.921521] Call Trace:
0.921535] <TASK>
0.921547] dump_stack_lvl+0x45/0x5e
0.921573] panic+0x10c/0x2b6
0.921593] mount_block_root+0x1c6/0x1d9
0.921616] prepare_namespace+0x136/0x165
0.921633] kernel_init_freeable+0x25d/0x287
0.921651] ? rest_init+0xd0/0xd0
0.921669] kernel_init+0x16/0x130
0.921685] ret_from_fork+0x22/0x30
0.921705] </TASK>
0.921790] Kernel Offset: 0x4e00000 from Oxffffffff81000000 (relocation range: 0xffffffff80000000-0xfffffffffffffff)
0.921827] ---[ end Kernel panic - not syncing: UFS: Unable to mount root fs on unknown-block(0,0) ]---
``

On kernel 6.1.0-0.deb11.17-amd64 and intel-microcode 3.20250512.1~deb11u1 the system is kind of bootable but shows severe errors.

A roll back to intel-microcode 3.20250211.1~deb11u1 fixes the problem for kernel 6.1.0-0.deb11.17-amd64 and 6.1.0-0.deb11.21-amd64.


-- System Information:
Debian Release: 11.11
APT prefers oldstable-updates
APT policy: (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-0.deb11.21-amd64 (SMP w/32 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages intel-microcode depends on:
ii iucode-tool 2.3.1-1

Versions of packages intel-microcode recommends:
ii initramfs-tools 0.140

intel-microcode suggests no packages.

``
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 45
model name : Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz
stepping : 7
microcode : 0x71a
cpu MHz : 1964.678
cache size : 20480 KB
physical id : 0
siblings : 16
core id : 0
cpu cores : 8
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln pts md_clear flush_l1d
vmx flags : vnmi preemption_timer invvpid ept_x_only ept_1gb flexpriority tsc_offset vtpr mtf vapic ept vpid unrestricted_guest ple
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit mmio_unknown
bogomips : 4389.36
clflush size : 64
cache_alignment : 64
address sizes : 46 bits physical, 48 bits virtual
power management:
``

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