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Subject: Re: How can I determine why gdb throws unknown exceptions when debugging programs with threads on my Cygwin installation?
To: The Cygwin Mailing List <cygwin AT cygwin DOT com>
References: <b0f98e400a8e4787b3e8b0b14a7a9baa AT OEM26 DOT oemsurplus DOT local>
Cc: "Jay P. Elston" <jay DOT elston AT oemgroupinc DOT com>
From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID: <b4be0a80-b158-3278-6610-74f59b03cfa2@dronecode.org.uk>
Date: Fri, 25 Oct 2019 14:32:09 +0100
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On 23/10/2019 18:25, Jay P. Elston wrote:
> Hi all,
> 
> I developed a problem debugging threads on my Cygwin installed on a Window 7 PC -- gdb throws an unknown target exception when it gets to the pthread_crreate() call.

This seems to be saying that the exception isn't thrown when not run 
under gdb?

> This problem seems localized to my PC (even after reinstalling Cygwin), and I am wondering what my next trouble shooting steps might be.
> 
> Here are the relevant lines from the gdb session:
> 
> $ gdb a.exe
> GNU gdb (GDB) (Cygwin 8.1.1-1) 8.1.1
> . . .
> This GDB was configured as "x86_64-pc-cygwin".
> . . .
> Reading symbols from a.exe...done.
> (gdb) run
> Starting program: /home/jay.elston/threadTest/a.exe [New Thread 12908.0xc38] [New Thread 12908.0x25b4] [New Thread 12908.0x182c] [New Thread 12908.0x2958] [New Thread 12908.0x2ce4] [New Thread 12908.0x2878] [New Thread 12908.0x3044]
> gdb: unknown target exception 0x80000001 at 0x778e7b97

0x80000001 is STATUS_GUARD_PAGE_VIOLATION

gdb reports this as 'unknown', as there's no unix signal this can be 
mapped to (for example, STATUS_ACCESS_VIOLATION is mapped to SIGSEGV)

Firstly, I'd suggest you do a 'bt' here, and see if any third party DLLs 
are in the call stack (e.g. AV products, etc.)

> Thread 7 received signal ?, Unknown signal.
> [Switching to Thread 12908.0x3044]
> 0x00000000778e7b97 in ntdll!RtlAllocateHeap ()
>     from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> (gdb) c
> Continuing.
> [Thread 12908.0x182c exited with code 2147483649] [Thread 12908.0x25b4 exited with code 2147483649] [Thread 12908.0x2878 exited with code 2147483649] [Thread 12908.0x2958 exited with code 2147483649] [Thread 12908.0x2ce4 exited with code 2147483649] [Inferior 1 (process 12908) exited with code 020000000001]
> 

Thanks for the simple test case.

Unfortunately, this doesn't reproduce for me.

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