Re: set a breakpoint in szone_error to debug
Re: set a breakpoint in szone_error to debug
- Subject: Re: set a breakpoint in szone_error to debug
- From: Jim Ingham <email@hidden>
- Date: Wed, 12 Oct 2005 08:55:28 -0700
I looks like not all the malloc errors go through szone_error.
Somebody ought to fix that error message. Anyway, they do all go
through "malloc_printf". Try breaking there.
Jim
On Oct 12, 2005, at 7:39 AM, Sean McBride wrote:
On 2005-09-26 21:51, Chris Espinosa said:
On Sep 26, 2005, at 9:35 PM, Tor Langballe wrote:
I can't for the life on me find any information on where/how to find
"szone_error" to put a breakpoint there.
In the Xcode user interface (2.1 or later):
- open the Breakpoints window
- look for the blue cube labeled "Double-click to enter a symbolic
breakpoint"
- double-click it
- enter 'szone_error'
Or from the gdb console:
- b szone_error
- c
Chris,
I've just now been trying to do this, but it doesn't work, or I need
coffee, or something...
First of all, I have 'fb szone_error' in my .gdbinit file. Next, I
launch my app in the xCode debugger, hit my splash screen, hit pause,
and type:
(gdb) info b
Num Type Disp Enb Address What
1 breakpoint keep y 0x9289dd68 <-[NSException raise]>
2 breakpoint keep y 0x92950b74 <-[_NSZombie release]>
3 breakpoint keep y <PENDING> szone_error
hmmm, .gdbinit worked for 2 of 3... why is szone_error pending?
Anyway, then:
(gdb) b szone_error
Breakpoint 4 at 0x9010d144
(gdb) info b
Num Type Disp Enb Address What
1 breakpoint keep y 0x9289dd68 <-[NSException raise]>
2 breakpoint keep y 0x92950b74 <-[_NSZombie release]>
3 breakpoint keep y <PENDING> szone_error
4 breakpoint keep y 0x9010d144 <szone_error+36>
(gdb) c
Continuing.
Pending breakpoint 3 - "szone_error" resolved
OK, looks like I should have 2 breakpoints there! Now repro a bug...
Brainsight(29735,0xa000ef98) malloc: *** Deallocation of a pointer
not
malloced: 0xf252a0; This could be a double free(), or free() called
with
the middle of an allocated block; Try setting environment variable
MallocHelp to see tools to help debug
Brainsight(29735,0xa000ef98) malloc: *** error for object 0xf25730:
Non-
aligned pointer being freed (2)
Brainsight(29735,0xa000ef98) malloc: *** set a breakpoint in
szone_error
to debug
Brainsight(29735,0xa000ef98) malloc: *** error for object 0xf25770:
Non-
aligned pointer being freed (2)
Brainsight(29735,0xa000ef98) malloc: *** set a breakpoint in
szone_error
to debug
etc. etc. ad nauseum,
But it never breaks! Am I doing something wrong?
Thanks!
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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