Package: libc6
Version: 2.31-13+deb11u4
Severity: critical
Dear Maintainer,
After an upgrade to version +deb11u4 on my system running Haswell
(4th gen Intel Core) CPU, most of the programs including bash or dpkg
are immediately crashing with SIGILL. The problem seems to be caused/
related to AVX
> The first thing would be to provide the output of /proc/cpuinfo
Pasting below (please **NOTE** that "avx2" would normally be there, but
is currently missing due to this kernel option `clearcpuid=293` with
which I booted the PC now -- I can **100%** confirm "avx2" was there
before, but don't
Hello, sorry for delayed response, I've managed to collect and analyze a
few coredump files with valid symbols (I installed libc6-dbg and
dpkg-dev, and pointed gdb at Debian's debuginfod server, also used
apt-get source to get the sources for libc6).
It seems there are at least 3-4 distinct pl
I can confirm updating the microcode by installing the intel-microcode
package and rebooting does indeed mitigate this issue. An LXC container
that was previously bricked due to update now starts and seems to behave
fully normally.
[0.00] microcode: microcode updated early to revision
Now that we understood the bug, I actually find strange that the
microcode update is fixing this, it looks like that the BMI2
instructions support has been added in a microcode update. Would it be
possible to give the output of /proc/cpuinfo with and without the
microcode update applied?
The /pr
Is there an easy way to unbrick a system affected by the issue? such as
a kernel-line option or a configuration file in /etc? I don't see how I
can set a GLIBC_TUNABLES environment variable for the whole system.
I was trying during my testing to set such option globally somehow, but
failed, tho
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