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Date:	Mon, 1 Apr 2013 01:03:02 -0400
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Hang on CTRL-C (was Re: livelock on sigfe)
Message-ID:	<20130401050302.GA5699@ednor.casa.cgf.cx>
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On Mon, Apr 01, 2013 at 11:53:38AM +0900, jojelino wrote:
>On 2013-03-17 AM 1:44, Christopher Faylor wrote:
>> No, not really.  The caller in this case isn't interesting.  The number
>> of threads executing is interesting.
>>
>> cgf
>>
>there is another debug session. I was trying to CTRL+C to mintty session 
>in which make process was running. process hanged with livelock.
>
>After inspecting cygtls content, i found that the two thread have empty 
>cygtls stack. so i couldn't figure out caller of _sigfe barrier, there 
>is no opportunity to pop stack of thread 1(which is main thread trapped 
>in sigfe wait loop), wait_sig thread or CTRL+C handler should have 
>caused bizzare.

>GNU gdb (GDB) 7.5.50.20130309-cvs (cygwin-special)
>Copyright (C) 2013 Free Software Foundation, Inc.
>License GPLv3+: GNU GPL version 3 or later 
><http://gnu.org/licenses/gpl.html>
>This is free software: you are free to change and redistribute it.
>There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>and "show warranty" for details.
>This GDB was configured as "i686-cygwin".
>For bug reporting instructions, please see:
><http://www.gnu.org/software/gdb/bugs/>.
>
>warning: the current range check setting does not match the language.
>
>Whether backtraces should continue past the entry point of a program is off.
>Attaching to process 4516
>[New Thread 4516.0x1e88]
>[New Thread 4516.0x1310]
>[New Thread 4516.0xf74]
>Reading symbols from /usr/bin/clang.exe...(no debugging symbols 
>found)...done.
>(gdb) i thr
>   Id   Target Id         Frame
>* 3    Thread 4516.0xf74 0x7c95a22a in ntdll!DbgBreakPoint ()
>    from /cygdrive/c/WINDOWS/system32/ntdll.dll
>   2    Thread 4516.0x1310 0x7c96845c in ntdll!KiFastSystemCallRet ()
>    from /cygdrive/c/WINDOWS/system32/ntdll.dll
>   1    Thread 4516.0x1e88 0x7c96845c in ntdll!KiFastSystemCallRet ()
>    from /cygdrive/c/WINDOWS/system32/ntdll.dll
>(gdb) i thr
>   Id   Target Id         Frame
>* 3    Thread 4516.0xf74 0x7c95a22a in ntdll!DbgBreakPoint ()
>    from /cygdrive/c/WINDOWS/system32/ntdll.dll
>   2    Thread 4516.0x1310 0x7c96845c in ntdll!KiFastSystemCallRet ()
>    from /cygdrive/c/WINDOWS/system32/ntdll.dll
>   1    Thread 4516.0x1e88 0x7c96845c in ntdll!KiFastSystemCallRet ()
>    from /cygdrive/c/WINDOWS/system32/ntdll.dll

Sorry for being so precise in my request that you provide information
on threads. It sure would be nice to see what thread 3 was doing via
a backtrace.

cgf

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