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Re: [patch] testsuite: Fix racy gdb.mi/mi-nsthrexec.exp FAIL

On Tuesday 30 June 2009 19:23:34, Jan Kratochvil wrote:

> @@ -59880,10 +59843,9 @@ Expecting: ^(-thread-info[
>  ]+[(]gdb[)] 
>  [ ]*)
>  -thread-info
> -~"Current language:  auto; currently asm\n"

Usually, I'd like to understand what causes these racy
issues, or where the output is being produced, since these issues
can easily be caused by real bug.  Non-stop is naturally harder
to test.

This must be from the language_info call in inf-loop.c, that
is always called when something stops.  In light of non-stop mode,
this is a weird place to output this (and to change expected
language) --- the thread that just stopped may not be the
current thread.  To be clear, I'm not expecting you to fix it,
just pointing it out.  :-)

> -^done,threads=[{id="2",target-id="Thread 0x7f2462b8d910 (LWP 9535)",frame={level="0",addr="0x0000000000400668",func="thread_execler",args=[{name="arg",value="0x0"}],file="../.././gdb/testsuite/gdb.mi/nsthrexec.c",fullname="/home/jkratoch/redhat/gdb-master/gdb/testsuite/gdb.mi/nsthrexec.c",line="28"},state="stopped"},{id="1",target-id="Thread 0x7f24635a56f0 (LWP 9296)",frame={level="0",addr="0x00007f246318da7f",func="__lll_unlock_wake_private",args=[],file="../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S",fullname="/usr/src/debug/glibc-20090510T1842/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S",line="336"},state="stopped"}],current-thread-id="1"
> +^done,threads=[{id="2",target-id="Thread 0x7f327a926910 (LWP 14350)",frame={level="0",addr="0x0000000000400668",func="thread_execler",args=[{name="arg",value="0x0"}],file="../.././gdb/testsuite/gdb.mi/nsthrexec.c",fullname="/home/jkratoch/redhat/gdb-master/gdb/testsuite/gdb.mi/nsthrexec.c",line="28"},state="stopped"},{id="1",target-id="Thread 0x7f327b33e6f0 (LWP 14301)",frame={level="0",addr="0x00007f327af20b0d",func="pthread_join",args=[{name="threadid",value="139854781507856"},{name="thread_return",value="0x0"}],file="pthread_join.c",fullname="/usr/src/debug/glibc-20090510T1842/nptl/pthread_join.c",line="89"},state="stopped"}],current-thread-id="1"
>  (gdb)  
> -FAIL: gdb.mi/mi-nsthrexec.exp: thread state, all stopped
> +PASS: gdb.mi/mi-nsthrexec.exp: thread state, all stopped
>  102-break-delete
>  102^done
>  (gdb) 

> the general .* match just aligns the function to existing get_mi_thread_list or
> check_mi_and_console_threads expect strings.

A parenthesis just to raise global awareness, not really applicable to
your case:  In general, this is not a good argument for non-stop mode
testsuite patches.  Other testsuite code may be using racy .*'s simply because
it is not being exercised in non-stop mode (we had to remove a bunch of
those before, tightening the expected strings up), which naturally is
more susceptible to racy issues, but also due to the fact that in many
cases there's no prompt to firmly pedal on.  In this case, we do want
to ignore any previous output though.  So...

> gdb/testsuite/
> 2009-06-30  Jan Kratochvil  <>
> 	* lib/mi-support.exp (mi_check_thread_states): Permit any output before
> 	the expected result record.

... Ok.

Pedro Alves

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