Segfault when loading saved game [Linux]

[pnomolos]

I left citybound running while I went and had lunch. When I came back I noticed that the interface seemed stuck. I checked the terminal process and saw that citybound had segfaulted. Tried restarting and now get a segfault before it can finish launching. Trace from gdb below. I can upload the savegame somewhere if that would help.

This is on nightly build citybound-v0.1.2-790-g7c076e3. Ubuntu 19.04.

warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts
of file /home/pnomolos/Downloads/citybound-v0.1.2-790-g7c076e3.
Use `info auto-load python-scripts [REGEXP]' to list them.
(gdb) run
Starting program: /home/pnomolos/Downloads/citybound-v0.1.2-790-g7c076e3 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
        Citybound v0.1.2-790-g7c076e3        

       This is the simulation server.        
  To connect and start playing, please open  
   this address in Chrome/Firefox/Safari:    
╭───────────────────────────────────────────╮
│           http://localhost:1234           │
╰───────────────────────────────────────────╯
[New Thread 0x7ffff79ff700 (LWP 711751)]
[New Thread 0x7ffff77fe700 (LWP 711752)]
Loading from savegame ./city...
[New Thread 0x7ffff75fd700 (LWP 711753)]
[New Thread 0x7ffff73fc700 (LWP 711754)]
[New Thread 0x7ffff6312700 (LWP 711755)]
[New Thread 0x7ffff5ef5700 (LWP 711756)]
[New Thread 0x7ffff5442700 (LWP 711757)]
Simulation running.
(You can stop this process at any point and the savegame should be fine)

Thread 1 "citybound-v0.1." received signal SIGSEGV, Segmentation fault.
compact::compact_vec::CompactVec<T,A>::double_buf (self=0x7ffe28000018)
    at /home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/compact-0.2.13/src/compact_vec.rs:78
78	/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/compact-0.2.13/src/compact_vec.rs: No such file or directory.

[aeplay]

Thanks for the detailed report. The stacktrace already gives me a good idea what's involved.

If you still have it, the save game would be great. Is it Ubuntu on an x64 processor?

[pnomolos]

@aeplay I'm so sorry it took so long to respond to you - yes, I am on x64 Ubuntu. I've grabbed the latest build and am going to see if it'll segfault over time. If you'd still like me to upload the old save file I can.

[thk123]

As far as I can tell on Linux, starting a game, immediately stopping and then restarting is sufficient to reproduce this error.

The last line of code is self.state.is_none() in cb_util/src/config_manager/mod.rs. I think it is the self.state that is invalid, but beyond that would just be guessing.

I guess I should also note, given that this is in the ConfigFileWatcher I should note that I got this crash after applying #381.