On 23/02/2021 17:26, Ritesh Raj Sarraf wrote:
Added the debian bug report in CC.
On Tue, 2021-02-23 at 17:19 +0000, Anton Ivanov wrote:
The current Debian user-mode-linux package in unstable is based on
the 5.10.5 stable source which includes the mentioned patch, but is
still causing an error for some users.
After updating the tree to 5.10.5 and applying all Debian patches
from the package, I cannot reproduce the bug.
I am running it on 5.10, 5.2 and 4.19 hosts with the same parameters
without issues. Hosts are all up to date Debian 10.8 and so is the
UML userspace.
Did you mean 5.10, 5.2 and 4.19 (UML) guests ?
We've seen this happen on Debian Testing and Unstable Host (of which
the former would soon be the next stable i.e. Debian Bullseye).
In our tests, when running the same linux uml binary (5.10) on a Debian
Stable Host, it is working fine.
I cannot reproduce it on a physical Bullseye host using the Debian
user-mode-linux package compiled from source.
Environment - Bullseye minimal install and build deps. 6 cores/12 threads Ryzen
I cannot reproduce it using the upstream source and the patches from the
user-mode-linux package
Environment - same as above.
I cannot reproduce it using the upstream source + patches and compiling on
Buster using the following:
1. Bullseye physical host, minimal install, same hardware
2. Bullseye VM, minimal install, running with 4 vCPUs on the same host
3. Bullseye LXC container running on a Debian Buster host, minimal install,
same hardware
In all cases it boots cleanly and there are no segfaults.
So, frankly, no idea what is causing it to crash - I have run most combinations
of 5.10 on a 5.10, all work fine here.
--
Anton R. Ivanov
https://www.kot-begemot.co.uk/
