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To:	cygwin AT cygwin DOT com
From:	jojelino <jojelino AT gmail DOT com>
Subject:	Re: Debugging totally broken with latest everything?
Date:	Tue, 16 Apr 2013 03:39:38 +0900
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References:	<516C24C5 DOT 80107 AT gmail DOT com>
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On 2013-04-16 AM 1:03, Dave Korn wrote:
>> Thread 2 (Thread 5536.0xe2c):
>> #0  0x77f88a87 in ntdll!ZwReadFile () from /win/c/WINNT/system32/ntdll.dll
>> #1  0x7c586381 in ?? ()
>> #2  0x610dd075 in wait_sig ()
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/sigproc.cc:1360
>> #3  0x61003e65 in cygthread::callfunc (this=0x6118a400 <threads>,
>>      issimplestub=<optimized out>)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/cygthread.cc:51
>> #4  0x610043ef in cygthread::stub (arg=0x6118a400 <threads>)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/cygthread.cc:93
>> #5  0x6100533d in _cygtls::call2 (this=<optimized out>,
>>      func=0x610043a0 <cygthread::stub(void*)>, arg=0x6118a400 <threads>,
>>      buf=0x610054cb <_cygtls::call(unsigned long (*)(void*, void*), void*)+91>)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/cygtls.cc:99
>> #6  0x0270ffb4 in ?? ()
>> #7  0x7c57b3bc in ?? ()
>> #8  0x00000000 in ?? ()
>>
>> Thread 1 (Thread 5536.0x1640):
>> #0  0x77f88f43 in ntdll!ZwWriteFile () from /win/c/WINNT/system32/ntdll.dll
>> #1  0x7c5864f9 in ?? ()
>> #2  0x610dc3f4 in sig_send (p=0x14ea444, si=..., tls=0x0)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/sigproc.cc:736
>> #3  0x6106b028 in tty_min::kill_pgrp (this=0x60fc0000, sig=-43)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/fhandler_termios.cc:133
>> #4  0x6106b129 in fhandler_termios::tcsetpgrp (
>>      this=0x61274690 <__real__Znwj+1629963920>, pgid=2428)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/fhandler_termios.cc:85
>> #5  0x610f9f78 in tcsetpgrp (fd=0, pgid=2428)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/termios.cc:237
>> #6  0x610d6745 in _sigfe () from /usr/bin/cygwin1.dll
>> #7  0x200bbb70 in ?? ()
>> #8  0x00418662 in ?? ()
>> #9  0x00521908 in ?? ()
>> #10 0x004eb052 in ?? ()
>> ---Type <return> to continue, or q <return> to quit---
>> #11 0x004eb265 in ?? ()
>> #12 0x004dd4a0 in ?? ()
>> #13 0x004dd6a5 in ?? ()
>> #14 0x005b11ab in ?? ()
>> #15 0x004feccb in ?? ()
>> #16 0x004ff6c0 in ?? ()
>> #17 0x005f2de2 in ?? ()
>> #18 0x004fed3b in ?? ()
>> #19 0x004fd9a0 in ?? ()
>> #20 0x004fdfc4 in ?? ()
>> #21 0x004fe4b8 in ?? ()
>> #22 0x004fe537 in ?? ()
>> #23 0x004f8345 in ?? ()
>> #24 0x004f6e0a in ?? ()
>> #25 0x004f8a85 in ?? ()
>> #26 0x004f6e0a in ?? ()
>> #27 0x004f9632 in ?? ()
>> #28 0x004011a8 in ?? ()
>> #29 0x6100763a in _cygwin_exit_return ()
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/dcrt0.cc:974
>> #30 0x6100533d in _cygtls::call2 (this=<optimized out>,
>>      func=0x61006c50 <dll_crt0_1(void*)>, arg=0x0,
>>      buf=0x610054cb <_cygtls::call(unsigned long (*)(void*, void*), void*)+91>)
>>      at /usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/cygtls.cc:99
>> #31 0x014eff78 in ?? ()
>> #32 0x006c1df2 in ?? ()
>> #33 0x00401015 in ?? ()
>> #34 0x7c5989d5 in ?? ()
>> #35 0x00000000 in ?? ()
>> (gdb)
>
>    Some notes on the above:
>
>    The same happens with both the previous version and current snapshot of the
> cygwin dll.  It also happens with both current gdb and an old gdb
> 6.8.0.20080328-cvs that I have lying around.
>
>    The hw.exe in question is your bog-standard hello world, compiled with "-g
> -O0" using gcc4-4.5.3-3.
>
>    "kill -9" won't kill gdb; I have to use Windows task manager.  If I've
> attached gdb to the hung gdb, I can kill it from there using the "k" instruction.
>
>    Anyone else having similar problems?
>
>      cheers,
>        DaveK
>
>
>
As far as i know, wait_sig thread in debugee is interrupted after 
stepping or breakpoint( n s si ni ). so, if you don't give cygwin 
sufficient time during gdb session until wait_sig thread handles signal 
about terminal, it hangs like you observed.

-- 
Regards.


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