Bug#1019855: Fwd: libc6: immediately crashes with SIGILL on 4th gen Intel Core CPUs (seems related to AVX2 instructions), bricking the whole system
Hi,
On 2022-10-04 19:44, debian-bug-report@p0358.net wrote:
> > 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, though maybe some method for this exists. As it stands I only see
> two possibilities of unbricking a system, both assuming you can access the
> partition externally from some bootable system:
>
> 1. Downgrade the affected libc6 package to a version before the one causing
> issues (either chroot and dpkg, or just extract and physically replace the
> files), after booting apt-mark hold libc6 to prevent faulty update from
> being installed until the issue is fixed
>
> 2. Or install intel-microcode package, assuming the microcode update adds
> the missing instructions in particular case, basically coincidentally fixing
> this issue (the updated CPU microcode is loaded on every bootup)
Please note that the microcode update might also be done through a
BIOS/firmware update if available.
Regards
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurelien@aurel32.net http://www.aurel32.net
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