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Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade

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On Fri, 18 Apr 2025, Colin Watson wrote:

> Ugh, I didn't realize your password would show up in the backtrace!  Sorry 
> about that - please change it as soon as possible.

Yeah, I caught that after I sent the message and already have. Ah well, it 
was overdue for rotation anyway.

> valid.  Therefore I think we must be dealing with action at a distance from 
> some previous memory corruption, which is going to be a pain to track down. 
> It might be in openssh-server, and the timing suggests that it probably is; 
> but it might also be in any other PAM module used in the auth phase.

Before I continue, I just remembered another issue (possibly PAM-related) 
which had come up irregularly enough to forget about, but may be smoke 
here.

Every so often, logging in normally behaves but also spits out:

"When trying to update a password, this return status indicates that the 
value provided as the current password is not correct."

which is some sort of Samba error. Maybe there's an interaction here.


Now as to your new instructions:

> Now try logging in again until you hit a crash, and then look in "sudo 
> journalctl -u ssh.service | less" for the output of valgrind; each instance 
> of its output will start with a line saying "Memcheck, a memory error 
> detector", and each line will have "==PID==" in it for some process ID.  I 
> don't think the output is likely to include your password this time, but it 
> will probably be worth checking it over just in case.

Typical such output attached.

> Separately, it might also be helpful for me to have a copy of your 
> /etc/pam.d/common-auth file, so I can see which other modules are being run

Attached. It should be the Sid default, modulo anything frobbing it during 
updates.

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Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Liam Stitt <stittl@cuug.ab.ca> - 2025-04-17 12:30 +0200
  Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-04-17 18:00 +0200
    Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Liam Stitt <stittl@cuug.ab.ca> - 2025-04-18 07:30 +0200
      Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-04-18 13:40 +0200
        Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Liam Stitt <stittl@cuug.ab.ca> - 2025-04-19 11:30 +0200
  Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Andreas Kurth <debian@akurth.de> - 2025-04-25 14:10 +0200
  Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Michel Casabona <michel.casabona@free.fr> - 2025-04-30 00:40 +0200
    Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Chris Hofstaedtler <zeha@debian.org> - 2025-04-30 11:10 +0200
      Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Michel Casabona <michel.casabona@free.fr> - 2025-04-30 12:30 +0200
    Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-04-30 13:50 +0200
  Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-04-30 15:00 +0200
    Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Michel Casabona <michel.casabona@free.fr> - 2025-04-30 17:30 +0200
      Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-04-30 23:00 +0200
        Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-05-01 00:10 +0200
  Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Lucio Crusca <lucio@sulweb.org> - 2025-05-01 10:10 +0200
    Bug#1103418: openssh-server irregularly crashing since 10.0p1 upgrade Colin Watson <cjwatson@debian.org> - 2025-05-01 13:50 +0200

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