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Subject: Re: GDB and thread
To: cygwin AT cygwin DOT com
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From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID: <d24dfbbd-5883-4675-1889-9428142aca04@gmail.com>
Date: Sat, 28 Dec 2019 23:28:33 +0100
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Am 28.12.2019 um 23:03 schrieb Ken Brown:
> On 12/28/2019 4:27 PM, Marco Atzeri wrote:
>> Hi,
>> I am trying to debug the libuv test failures,
>> but it seems I am not able to convince GDB on stopping
>> just before the failure.
>>
>> Is "thread apply all" working on Cygwin ?
>> The fact that produces no output in comparison to
>> a normal break command is a bit strange
>>
>> (gdb) break test-dlerror.c:34
>> Breakpoint 1 at 0x10040b0b0: file /pub/devel/libuv/libuv-1.34.0/test/test-dlerro
>> r.c, line 34.
>> (gdb) thread apply all break test-dlerror.c:34
> 
> Others know this better than I do, but I seem to recall that a break command
> automatically applies to all threads.  In other words, "thread apply all" is
> redundant.

It seems to ignore any break for what I see.
thread apply all was a tentative after simple break was ineffective

> 
>> (gdb) run dlerror
>> Starting program: /cygdrive/d/cyg_pub/devel/libuv/libuv-1.34.0-build/test/.libs/
>> run-tests.exe dlerror
>> [New Thread 139176.0x231a0]
>> [New Thread 139176.0x231c8]
>> [New Thread 139176.0x21a0c]
>> [New Thread 139176.0x2332c]
>> [New Thread 139176.0x230b0]
>> [New Thread 139176.0x231cc]
>> [New Thread 139176.0x23028]
>> [New Thread 139176.0x23214]
>> [Thread 139176.0x23028 exited with code 0]
>> not ok 1 - dlerror
>> # exit code 134
>> # Output from process `dlerror`:
>> # Assertion failed in /pub/devel/libuv/libuv-1.34.0/test/test-dlerror.c on line
>> 45: strstr(msg, path) != NULL
>> [Thread 139176.0x231c8 exited with code 134]
>> [Thread 139176.0x230b0 exited with code 134]
>> [Thread 139176.0x2332c exited with code 134]
>> [Thread 139176.0x23214 exited with code 134]
>> [Thread 139176.0x21a0c exited with code 134]
>> [Inferior 1 (process 139176) exited with code 0206]
>> (gdb)
>>
>>
>> Any hint will be appreciated
> 
> Might this be related to optimization?  That could change the order in which
> lines of code are executed.  Have you tried building without optimization?

Already thought, but it is built with -ggdb -O0

> Ken

Marco

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