libc-2.31.so segfaults

[Robert Dinse]

[510606.379044] lightdm[4046529]: segfault at 55007d2a3f8b ip 00007f7260003f0b sp 00007fffbb5a0600 error 4 in libc-2.31.so[7f725ff8e000+178000]

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lightdm 1.30.0-0ubuntu4~20.04.1
Uname: Linux 5.10.32 x86_64
ApportVersion: 2.20.11-0ubuntu27.17
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Thu Apr 29 20:55:18 2021
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Gunnar Hjalmarsson (gunnarhj)]

Thanks for your report!

Since you use lightdm 1.30.0-0ubuntu4~20.04.1 from focal-proposed, can you please downgrade to version 1.30.0-0ubuntu3.1 and let us know if it makes a difference.

[Robert Dinse (nanook)]

Ok, I've installed the old version to see if this occurs, this was not a frequent problem with this version so I'm unlikely to have an answer overnight. However, I was under the impression that the purpose of proposed was to test and get feedback and fix such things before it entered mainstream.

[Gunnar Hjalmarsson (gunnarhj)]

On 2021-04-30 23:59, Robert Dinse wrote:
> I was under the impression that the purpose of proposed was to test
> and get feedback and fix such things before it entered mainstream.

It is, but such testing happens normally via dedicated bug reports. As regards the current lightdm version in -proposed that is bug #1921655.

[Gunnar Hjalmarsson (gunnarhj)]

OTOH... If you haven't enabled the guest session feature, the difference between the lightdm versions in focal-release and focal-proposed can't possibly cause the segfault.

Did you possibly install everything from focal-proposed? In that case you may be actually 'testing' this upload:

https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.3

After all the error message includes "error 4 in libc-2.31.so".

[Robert Dinse (nanook)]

     Yes, I have other things segfaulting with libc-2.31.so as well but
ubuntu-bug would not allow me to originate a bug report on a library.

On 4/30/21 4:39 PM, Gunnar Hjalmarsson wrote:
> OTOH... If you haven't enabled the guest session feature, the difference
> between the lightdm versions in focal-release and focal-proposed can't
> possibly cause the segfault.
>
> Did you possibly install everything from focal-proposed? In that case
> you may be actually 'testing' this upload:
>
> https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.3
>
> After all the error message includes "error 4 in libc-2.31.so".
>

[Gunnar Hjalmarsson (gunnarhj)]

Right, bugs are filed against source packages. Changing.

[Simon Chopin (schopin)]

Hi,

Thanks for the report, and sorry for the delay.

Sadly, as it is there is no way to solve the issue as we don't have a usable stack trace, thus marking as Incomplete. I'll be uploading a fix for bug 2001932 that solves a segfault, it *might* be the cause of your issues.

[Launchpad Janitor (janitor)]

[Expired for glibc (Ubuntu) because there has been no activity for 60 days.]

[Robert Dinse (nanook)]

Why fix when you can ignore?

On 7/30/23 21:17, Launchpad Bug Tracker wrote:
> [Expired for glibc (Ubuntu) because there has been no activity for 60
> days.]
>
> ** Changed in: glibc (Ubuntu)
> Status: Incomplete => Expired
>