Help with gdb needed

[Marcus Müller]

Hi,

I'm hunting a bug in conjunction with GSAvahiNetService. I'm on FreeBSD 9.1 with clang 3.1 and current libobjc2 and GNUstep (both svn r36011).

The stacktrace is as follows:

Program received signal SIGSEGV, Segmentation fault.

[Switching to Thread 806c07400 (LWP 100877)]

0x00000008011d23ac in objc_msgSend_fpret () from /usr/local/lib/libobjc.so.4

(gdb) bt

#0  0x00000008011d23ac in objc_msgSend_fpret ()

   from /usr/local/lib/libobjc.so.4

#1  0x0000000800d6ade9 in -[GSRunLoopCtxt pollUntil:within:] (

    self=0x806d5e248, _cmd=0x80113b990 <.objc_selector_list+544>, 

    milliseconds=0, contexts=0x806c3bfa8) at GSRunLoopCtxt.m:639

#2  0x0000000800c5f333 in -[NSRunLoop acceptInputForMode:beforeDate:] (

    self=0x806c17208, _cmd=0x80113ba60 <.objc_selector_list+752>, 

    mode=0x80113b310 <.objc_str>, limit_date=0x80711ae68) at NSRunLoop.m:1206

#3  0x0000000800c5f807 in -[NSRunLoop runMode:beforeDate:] (self=0x806c17208, 

    _cmd=0x80113bb00 <.objc_selector_list+912>, mode=0x80113b310 <.objc_str>, 

    date=0x806fb64c8) at NSRunLoop.m:1274

#4  0x0000000800c5fa0e in -[NSRunLoop runUntilDate:] (self=0x806c17208, 

    _cmd=0x80113bb50 <.objc_selector_list+992>, date=0x806fb64c8)

    at NSRunLoop.m:1305

#5  0x0000000800c5f873 in -[NSRunLoop run] (self=0x806c17208, 

    _cmd=0x60bdf0 <.objc_selector_list+752>) at NSRunLoop.m:1288

#6  0x0000000000404da2 in -[XBellRinger run] (self=0x806c171c8, 

    _cmd=0x60a4b0 <.objc_selector_list+64>) at XBellRinger.m:126

#7  0x0000000000404185 in main (argc=5, argv=0x7fffffffd8e0)

    at XBellRinger_main.m:20

GSRunLoopCtxt.m:639 looks like this:

 /*

  * The watcher is still valid - so call its

  * receivers event handling method.

  */

 [watcher->receiver receivedEvent: watcher->data

     type: watcher->type

    extra: (void*)(uintptr_t)fd

  forMode: mode];

(gdb) frame 1

#1  0x0000000800d6ade9 in -[GSRunLoopCtxt pollUntil:within:] (

    self=0x806d5e248, _cmd=0x80113b990 <.objc_selector_list+544>, 

    milliseconds=0, contexts=0x806c3bfa8) at GSRunLoopCtxt.m:639

639   [watcher->receiver receivedEvent: watcher->data

(gdb) p watcher

$1 = (struct GSRunLoopWatcher *) 0x8071b8d68

(gdb) p watcher->receiver

Cannot set lwp 100877 registers: Invalid argument

An error occurred while in a function called from GDB.

Evaluation of the _expression_ containing the function

(malloc) will be abandoned.

When the function is done executing, GDB will silently stop.

What is broken here? How can I proceed?

Cheers,

  Marcus

-- 

Marcus Müller  .  .  .  http://www.mulle-kybernetik.com/znek/

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