• Tim (4/4) Jan 20 2021 Hi all,
• Adam D. Ruppe (8/12) Jan 20 2021 Unix signal #4 is illegal instruction (negative returns usually
• Tim (2/16) Jan 20 2021 Oh, so it's just signal 4, not -4?
• Paul Backus (4/5) Jan 20 2021 The signal is 4. The exit status is -4.
• Tim (3/9) Jan 20 2021 Those lines were super useful! Not sure why I couldn't find that

Tim <tim.oliver tutanota.com> writes:

Hi all,

 From time to time my program crashes with exit code -4. I can't 
seem to find much on the code. Does anyone know what this means 
and how to debug the issue?

Adam D. Ruppe <destructionator gmail.com> writes:

On Thursday, 21 January 2021 at 00:37:19 UTC, Tim wrote:
 Hi all,

 From time to time my program crashes with exit code -4. I can't 
 seem to find much on the code. Does anyone know what this means 
 and how to debug the issue?


mean it was killed by that number signal). Most common way to hit 
that is a broken function pointer or corrupted class leading into 
data that isn't supposed to be executed as code. Also possible an 
assert(0) got hit in release mode or something like that.

Easiest way to debug it is to open it in a debugger and look at 
the stack trace to see where it came from.

Tim <tim.oliver tutanota.com> writes:

On Thursday, 21 January 2021 at 00:47:36 UTC, Adam D. Ruppe wrote:
 On Thursday, 21 January 2021 at 00:37:19 UTC, Tim wrote:
 Hi all,

 From time to time my program crashes with exit code -4. I 
 can't seem to find much on the code. Does anyone know what 
 this means and how to debug the issue?


 mean it was killed by that number signal). Most common way to 
 hit that is a broken function pointer or corrupted class 
 leading into data that isn't supposed to be executed as code. 
 Also possible an assert(0) got hit in release mode or something 
 like that.

 Easiest way to debug it is to open it in a debugger and look at 
 the stack trace to see where it came from.

Oh, so it's just signal 4, not -4?

Paul Backus <snarwin gmail.com> writes:

On Thursday, 21 January 2021 at 00:49:26 UTC, Tim wrote:
 Oh, so it's just signal 4, not -4?

The signal is 4. The exit status is -4.

https://en.wikipedia.org/wiki/Signal_(IPC)#POSIX_signals
https://en.wikipedia.org/wiki/Exit_status#POSIX

Tim <tim.oliver tutanota.com> writes:

On Thursday, 21 January 2021 at 01:07:22 UTC, Paul Backus wrote:
 On Thursday, 21 January 2021 at 00:49:26 UTC, Tim wrote:
 Oh, so it's just signal 4, not -4?

 The signal is 4. The exit status is -4.

 https://en.wikipedia.org/wiki/Signal_(IPC)#POSIX_signals
 https://en.wikipedia.org/wiki/Exit_status#POSIX

Those lines were super useful! Not sure why I couldn't find that 
info on my own ...