[9fans] Irc segmentation fault

[9fans] Irc segmentation fault

[Rudolf Sykora]

Hello,

I am trying to use the Irc acme client in plan9port, the one from

https://swtch.com/irc/

However, when I run it, it segfaults:

$ Irc irc.freenode.org
Segmentation fault

Has anybody used this client successfully?
(Or would you rather recommend something else?)

Thanks
Ruda

Re: [9fans] Irc segmentation fault

[Rudolf Sykora]

> $ Irc irc.freenode.org
> Segmentation fault

Do I have to use acid to debug it, or is it possible to use the usual
unix gdb to debug this on p9p?

Thanks
Ruda

[9fans] Irc segmentation fault

[Nick Owens]

acid is next to impossible to use on unix systems. just run gdb with
'thread apply all bt'.. should give you an idea of what's wrong.

On Jun 29, 2017 00:33, "Rudolf Sykora" <rudolf.sykora at gmail.com> wrote:

> > $ Irc irc.freenode.org
> > Segmentation fault
>
> Do I have to use acid to debug it, or is it possible to use the usual
> unix gdb to debug this on p9p?
>
> Thanks
> Ruda
>
>
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[9fans] Irc segmentation fault

[Rudolf Sykora]

On 29 June 2017 at 09:39, Nick Owens <mischief at offblast.org> wrote:
> acid is next to impossible to use on unix systems. just run gdb with 'thread
> apply all bt'.. should give you an idea of what's wrong.

If I run Irc in gdb, I get

(gdb) run irc.freenode.org
Starting program: /usr/local/plan9port/bin/Irc irc.freenode.org
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff749bedf in raise () from /lib64/libpthread.so.0
(gdb) where
#0  0x00007ffff749bedf in raise () from /lib64/libpthread.so.0
#1  0x000000000040df34 in child () at daemonize.c:38
#2  0x000000000040e18e in _threadsetupdaemonize () at daemonize.c:153
#3  0x000000000040de3d in p9main (argc=2, argv=0x7fffffffdcb8) at thread.c:721
#4  0x0000000000402ae9 in main (argc=<optimized out>, argv=<optimized out>)
    at main.c:10

which I really don't understand...
How could argc, argv be 'optimized out'?

Thanks for any comments!
Ruda

[9fans] Irc segmentation fault

[Nick Owens]

you probably need to use gcc -O0 -g for that. but it looks like the problem
is in dameonize.c:38. lowering optimization might help since there might be
inlined functions.. haven't really looked at Irc.

On Jun 29, 2017 02:24, "Rudolf Sykora" <rudolf.sykora at gmail.com> wrote:

On 29 June 2017 at 09:39, Nick Owens <mischief at offblast.org> wrote:
> acid is next to impossible to use on unix systems. just run gdb with
'thread
> apply all bt'.. should give you an idea of what's wrong.

If I run Irc in gdb, I get

(gdb) run irc.freenode.org
Starting program: /usr/local/plan9port/bin/Irc irc.freenode.org
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff749bedf in raise () from /lib64/libpthread.so.0
(gdb) where
#0  0x00007ffff749bedf in raise () from /lib64/libpthread.so.0
#1  0x000000000040df34 in child () at daemonize.c:38
#2  0x000000000040e18e in _threadsetupdaemonize () at daemonize.c:153
#3  0x000000000040de3d in p9main (argc=2, argv=0x7fffffffdcb8) at
thread.c:721
#4  0x0000000000402ae9 in main (argc=<optimized out>, argv=<optimized out>)
    at main.c:10

which I really don't understand...
How could argc, argv be 'optimized out'?

Thanks for any comments!
Ruda
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Re: [9fans] Irc segmentation fault

[Rudolf Sykora]

On 29 June 2017 at 11:29, Nick Owens <mischief@offblast.org> wrote:
> you probably need to use gcc -O0 -g for that.

Doesn't it matter that the program is normally built with 9c?

Thanks
Ruda