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Date: Sat, 27 May 2006 21:12:20 +0200
From: Ralf Habacker <ralf DOT habacker AT freenet DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: 1.5.19: changes have broken Qt3
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Dave Korn schrieb:
> On 24 May 2006 13:19, Ralf Habacker wrote:
> 
>> This breakpoint is never reached (at least in released gdb) and makes it
>> hard to debug cygwin's threading stuff, probably impossible in this area.
> 
>   How many times do you have to be told?  The last released gdb is known to
> not cope with this.  IT IS A KNOWN BUG.  IT HAS BEEN FIXED.
> 
I have downloaded and compiled gdb weekly snapshot (20060522), but there
are still problems with tracing after an internal exception occured. I
am using testcase mutex1n.c from cvs path
src/winsup/testsuite/winsup.api/pthread and set a breakpoint to
pthread_mutexattr_init


Breakpoint 1, pthread_mutexattr_init (attr=0x404040) at
/netrel/src/cygwin-snapshot-20060522-1/winsup/cygwin/cygtls.h:253
1: x/i $eip  0x610b0f07 <pthread_mutexattr_init+7>:     lea
0xffffff08(%ebp),%esi
(gdb) ni

<snip>

0x610b1005      129     in
/netrel/src/cygwin-snapshot-20060522-1/winsup/cygwin/thread.cc
1: x/i $eip  0x610b1005 <pthread_mutexattr_init+261>:   cmpl
$0xdf0df049,0x4(%eax)
(gdb)

here the internal exception occurs and gdb is out of sync until the
application ends  or a later breakpoint is hit.

0x7c91eaf0 in ntdll!LdrDisableThreadCalloutsForDll () from
/c/WINDOWS/system32/ntdll.dll
1: x/i $eip  0x7c91eaf0 <ntdll!LdrDisableThreadCalloutsForDll+4>:
mov    (%esp),%ebx
(gdb)
0x7c91eaf3 in ntdll!LdrDisableThreadCalloutsForDll () from
/c/WINDOWS/system32/ntdll.dll
1: x/i $eip  0x7c91eaf3 <ntdll!LdrDisableThreadCalloutsForDll+7>:
push   %ecx
(gdb)
0x7c91eaf4 in ntdll!LdrDisableThreadCalloutsForDll () from
/c/WINDOWS/system32/ntdll.dll
1: x/i $eip  0x7c91eaf4 <ntdll!LdrDisableThreadCalloutsForDll+8>:
push   %ebx
(gdb)
0x7c91eaf5 in ntdll!LdrDisableThreadCalloutsForDll () from
/c/WINDOWS/system32/ntdll.dll
1: x/i $eip  0x7c91eaf5 <ntdll!LdrDisableThreadCalloutsForDll+9>:
call   0x7c9477c1 <ntdll!LdrFindCreateProcessManifest+424>
(gdb)

Program exited normally.
(gdb)

Regards
Ralf

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