#1150756 uucp: in.uucpd crashes a few times a day in pam_vprompt ()

Package:
uucp
Source:
uucp
Description:
Unix to Unix Copy Program
Submitter:
John Hughes
Date:
2026-10-13 09:59:03 UTC
Severity:
normal
#1150756#5
Date:
2026-10-13 09:45:13 UTC
From:
To:
Dear Maintainer,

   * What led up to the situation?

We, for historical reasons (laziness) use UUCP for some inter machine communications

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

Installed trixie

   * What was the outcome of this action?

From time to time in.uucpd crashes, apparently in pam_vprompt ()

   * What outcome did you expect instead?

No crashes?

It doesn't crash every time, the majority of calls work.

gdb gives me this backtrace:

Core was generated by `/usr/sbin/in.uucpd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000558463adea07 in ?? ()
(gdb) bt
#0  0x0000558463adea07 in ?? ()
#1  0x00007ffa24f0c590 in pam_vprompt () from /lib/x86_64-linux-gnu/libpam.so.0
#2  0x00007ffa24f0c7ce in pam_prompt () from /lib/x86_64-linux-gnu/libpam.so.0
#3  0x00007ffa24f06b07 in ?? () from /lib/x86_64-linux-gnu/libpam.so.0
#4  0x00007ffa24c5303a in pam_sm_authenticate ()
   from /usr/lib/x86_64-linux-gnu/security/pam_unix.so
#5  0x00007ffa24f054de in ?? () from /lib/x86_64-linux-gnu/libpam.so.0
#6  0x00007ffa24f04be3 in pam_authenticate ()
   from /lib/x86_64-linux-gnu/libpam.so.0
#7  0x0000558463ade582 in ?? ()
#8  0x00007ffa24d31ca8 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#9  0x00007ffa24d31d65 in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
#10 0x0000558463ade901 in ?? ()
(gdb)

No other process on the server is crashing.