Re: how to find a segfault?
Re: how to find a segfault?
- Subject: Re: how to find a segfault?
- From: Jim Ingham <email@hidden>
- Date: Fri, 9 Jul 2004 16:23:18 -0700
Yes, file a bug on this. Xcode already fetches the stack in chunks so
an insanely deep stack doesn't make it choke up. But it should also
display the chunks as it gets them, rather than waiting till it gets
all 100 odd thousand frames... That way you would have been able to
tell what was going on in Xcode as well.
It should also probably have some logic to say "I found a hundred
thousand frames in the backtrace, you probably just want to look at the
first 10, right..."
Jim
On Jul 9, 2004, at 2:55 PM, Markian Hlynka wrote:
On Jul 9, 2004, at 15:14, Brent Gulanowski wrote:
On Jul 9, 2004, at 4:50 PM, Markian Hlynka wrote:
Ok, my program has a seg fault:
myMona has exited due to signal 11 (SIGSEGV).
if I was using gdb/gcc on the CLI, I'd run it through GDB and type
"where".
I did this on the console drawer in xcode's debugger, and I get a
note:
GDB: Loading 104819 stack frames... (9%)
now, it's going up VERY slowly. too slowly to be useful.
Am I doing something wrong? suggestions?
You are caught in a recursive loop. In AppKit this tends to result
from overriding a method and calling some other method that calls (or
sets a flag that results in a successive call to) the overridden
method. I usually just put a break point in a few likely places and
see which one reveals the recursion in the stack.
yeah, sorry, all, I was really dumb. I had two similarly named
functions, and I called the wrong one. (I don't usually write from the
AppKit). When I ran in gdb, however, this was immediately apparent:
Program received signal EXC_BAD_ACCESS, Could not access memory.
0x0000d030 in Generate_Legal_Moves(Board_T&, __Move_T*)
(theBoard=@0x7f994, movelist=0x7fb28) at
/Users/markian/Documents/Development/PhD/Post-Candidacy/CodeGen/Games/
myMona/applicationDependencies.cc:443
443 { //this function generates all legal moves. make sure
MAX_LEGAL_MOVES
(gdb) where
#0 0x0000d030 in Generate_Legal_Moves(Board_T&, __Move_T*)
(theBoard=@0x7f994, movelist=0x7fb28) at
/Users/markian/Documents/Development/PhD/Post-Candidacy/CodeGen/Games/
myMona/applicationDependencies.cc:443
#1 0x0000d054 in Generate_Legal_Moves(Board_T&, __Move_T*)
(theBoard=@0x7f994, movelist=0x7fb28) at
/Users/markian/Documents/Development/PhD/Post-Candidacy/CodeGen/Games/
myMona/applicationDependencies.cc:455
...
#966 0x0000d054 in Generate_Legal_Moves(Board_T&, __Move_T*)
(theBoard=@0x7f994, movelist=0x7fb28) at
/Users/markian/Documents/Development/PhD/Post-Candidacy/CodeGen/Games/
myMona/applicationDependencies.cc:455
So, my real beef is that is _wasn't readily apparent from within
xcode; I had to run gdb on the CLI. Do you think this qualifies as a
worthy 'bug'?
Markian
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