Re: [9front] 9Front Drawterm Code 139 Sig 11 SIGSEGV

[Dmad <dmadhatr@sdf.org>]

On Sat, 23 Sep 2023, Dmad wrote:

> Date: Sat, 23 Sep 2023 13:52:04 +0000 (UTC)
> From: Dmad <dmadhatr@sdf.org>
> Reply-To: 9front@9front.org
> To: 9front@9front.org
> Subject: Re: [9front] 9Front Drawterm Code 139 Sig 11 SIGSEGV
> 
> On Fri, 22 Sep 2023, Amavect wrote:
>
>>  Date: Fri, 22 Sep 2023 20:10:29 -0500
>>  From: Amavect <amavect@gmail.com>
>>  Reply-To: 9front@9front.org
>>  To: 9front@9front.org
>>  Subject: Re: [9front] 9Front Drawterm Code 139 Sig 11 SIGSEGV
>>
>>  On Fri, Sep 22, 2023 at 2:21?PM Dmad <dmadhatr@sdf.org> wrote:
>>>  Let me know if anyone has any advice on how to debug/troubleshoot.
>>>
>>>  Really appreciate your time, beat the shit out of the internet trying to
>>>  find an answer on the lists/forums/etc.
>>  Do you know how to get a backtrace with gdb or any other debugger?
>>  For gdb, just pass the executable filename, type r to run.
>>  Trigger the crash, and type bt for a backtrace.
>>
>>  Additionally, you can recompile with "-O0 -ggdb" in the CFLAGS.
>>  If that changes the behavior, that's a hint as to what's wrong.
>>
>>  Thanks,
>>  Amavect
>> 
>> 
>
> Amavect, I started reading up on using backtrace with gdb yesterday as well- 
> so that too is solid advice - thanks.  Will continue to hunt.   Will run with 
> the recompile and the CFLAGS you gave.
>
> Apprciate it, thanks..
>
> dmadhatr@sdf.org
> SDF Public Access UNIX System - http://sdf.org
>
>

Ok, here is what I found:

dmadhatr@dmadhatr-freetbsd-pc ~/drawterm (front)> gdb -ex=run --args 
./drawterm -h 205.166.XX.XXX -a 205.166.XX.XXX -u glenda -r 
/home/dmadhatr/Public/
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Reading symbols from ./drawterm...
Starting program: /usr/home/dmadhatr/drawterm/drawterm -h 205.166.XX.XXX 
-a 205.166.XX.XXX -u glenda -r /home/dmadhatr/Public/
[New LWP 130212 of process 59751]
[New LWP 130213 of process 59751]
[New LWP 130217 of process 59751]

Thread 1 received signal SIGSEGV, Segmentation fault.
Address not mapped to object.
0x0000000000294488 in tas (x=x@entry=0x0) at tas.c:9
9		asm(	"movl   $1, %%eax\n\t"
(gdb) bt
#0  0x0000000000294488 in tas (x=x@entry=0x0) at tas.c:9
#1  0x000000000028dd5b in canlock (lk=0x0) at lock.c:62
#2  lock (lk=lk@entry=0x0) at lock.c:71
#3  0x0000000000226cdf in incref (r=0x0) at chan.c:57
#4  walk (cp=cp@entry=0x7fffffffdf18, names=0x800d2c780, nnames=2, 
nomount=nomount@entry=0, nerror=nerror@entry=0x7fffffffdeec) at chan.c:847
#5  0x0000000000227ed3 in namec (aname=0x800c3ce80 "./dev/label", 
aname@entry=0x800c3ce60 "./dev/label", amode=amode@entry=0, 
omode=omode@entry=0, perm=perm@entry=0) at chan.c:1273
#6  0x0000000000242e1b in _sysstat (name=0x0, name@entry=0x800c3ce60 
"./dev/label", buf=buf@entry=0x800c57050, n=n@entry=115) at sysfile.c:612
#7  0x00000000002443c4 in sysstat (name=name@entry=0x800c3ce60 
"./dev/label", buf=buf@entry=0x800c57050 "dev", n=n@entry=115) at 
sysfile.c:1099
#8  0x00000000002894b7 in dirstat (name=0x800c3ce60 "./dev/label") at 
dirstat.c:23
#9  0x00000000002481ca in file (parent=0x800c49310, 
name=name@entry=0x800d4df52 "label") at exportfs.c:284
#10 0x0000000000248cc7 in Xwalk (t=0x800d44350) at exportsrv.c:199
#11 0x0000000000247820 in exportfs (fd=fd@entry=6) at exportfs.c:99
#12 0x000000000022211e in ncpu (host=<optimized out>, cmd=<optimized out>) 
at cpu.c:239
#13 0x0000000000222901 in cpubody () at cpu.c:384
#14 0x0000000000285f3a in guimain () at x11.c:1259
#15 0x000000000022275a in cpumain (argc=0, argc@entry=9, argv=<optimized 
out>, argv@entry=0x7fffffffe5f0) at cpu.c:335
#16 0x00000000002218cc in main (argc=9, argv=0x7fffffffe5f0) at main.c:67

----- First Run with gdb and bt -----

---- Recompiling .drawterm with CFLAGS recommending and running again ----
# Recompiling with -O0 -ggdb for CONF=freebsd make
# tar'd /proc/59751 to debug folder for trouble shooting

Was not able to get a bt stack after compiling with additional CFLAGs

Same error message, drawterm unable to chdir (see first email).


dmadhatr@sdf.org
SDF Public Access UNIX System - http://sdf.org