fp ide crashes on launch with runtime error 106 at $00000000004D7E1D when running under tmux

[Raúl Soriano]

Bionic Beaver 18.04

fp-ide 3.0.4+dfsg-15ubuntu2

On a terminal, whether it's an empty directory or one containing an older project, launch "fp" to open the ide. It crashes like this every single time.

$  fp
Runtime error 106 at $00000000004D7E1D
  $00000000004D7E1D

$

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: fp-ide 3.0.4+dfsg-15ubuntu2
Uname: Linux 4.15.0-041500-generic x86_64
ApportVersion: 2.20.8-0ubuntu8
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Feb 7 05:01:57 2018
InstallationDate: Installed on 2013-05-23 (1720 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
PackageArchitecture: all
SourcePackage: fpc
UpgradeStatus: Upgraded to bionic on 2018-01-29 (9 days ago)

[Raúl Soriano (gatoloko)]

Got the new fp-ide update, version 3.0.4+dfsg-15ubuntu3, still crashing just the same.

[Raúl Soriano (gatoloko)]

Just tried with the 3.0.4+dfsg-16 packages, still the exact same thing.

[Raúl Soriano (gatoloko)]

Made a clean installation of Ubuntu 18.04, fully updated, installed fp-ide, still crashes all the same.

[Raúl Soriano (gatoloko)]

Just tried with the 3.0.4+dfsg-18 packages, still the exact same thing.

[Paul Gevers (paul-climbing)]

Can you please give us the outcome of

ls -al $(readlink -f $(which fp))

[Paul Gevers (paul-climbing)]

And for me, on a Debian buster system, it works without issue.

[Raúl Soriano (gatoloko)]

I've just found the root cause for this is tmux. If fp ide is run on an xfce terminal it doesn't crash, but under tmux on the same xfce terminal it does.

I'll try to identify whether this is a "package problem" or an upstream one.

[Raúl Soriano (gatoloko)]

In reply to Paul, here is the output you asked for:

~ ls -al $(readlink -f $(which fp))
-rwxr-xr-x 1 root root 5266448 abr 22 16:10 /usr/bin/fp-3.0.4

Guess you wanted to verify I wasn't hitting a "third party" binary or something like that.

I've been combing through freepascal.org bug tracker and found that fp-ide is somewhat sensitive regarding terminals.

In their forum I've found a recent question regarding problems with tmux (no bug report though). The proposed workaround is to run fp ide inside screen inside tmux until a better solution can be found ( https://forum.lazarus.freepascal.org/index.php?topic=40299.0 ).

[Gianfranco Costamagna (costamagnagianfranco)]

Can you please try this one?
https://launchpad.net/ubuntu/+source/fpc/3.0.4+dfsg-20~build1

[Thao Le (thaolt)]

Hi, I think problem is fp parses process stat files.

tmux process look like this:

26474 (tmux: server) S 1 26474 26474 ...

Please see https://asciinema.org/a/233446 for full strace run

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.