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Re: [PATCH][gdb/testsuite] Fix command result testing in mi-complete.exp
- From: Andrew Burgess <andrew dot burgess at embecosm dot com>
- To: Tom de Vries <tdevries at suse dot de>
- Cc: gdb-patches at sourceware dot org
- Date: Tue, 23 Jul 2019 09:26:50 +0100
- Subject: Re: [PATCH][gdb/testsuite] Fix command result testing in mi-complete.exp
- References: <20190723075010.GA27426@delia>
* Tom de Vries <tdevries@suse.de> [2019-07-23 09:50:12 +0200]:
> Hi,
>
> When running gdb.mi/mi-complete.exp in conjunction with:
> ...
> $ stress -c $(($(cat /proc/cpuinfo | grep -c "^processor") + 1))
> ...
> we get less than 50% full passes:
> ...
> $ for n in $(seq 1 100); do \
> make V=1 -O check \
> 'RUNTESTFLAGS=gdb.mi/mi-complete.exp --target_board=unix'; \
> done 2>&1 \
> | grep "expected passes" | sort | uniq -c
> 45 # of expected passes 7
> 9 # of expected passes 8
> 46 # of expected passes 9
> ...
>
> A diff between a passing and failing gdb.log shows this difference:
> ...
> -&"set max-completions 1\n"
> 2-complete br
> +&"set max-completions 1\n"
> ...
>
> The problem is that the test-case issues the "set max-completion <n>" command,
> and without waiting for the output issues a next command, and tries to parse
> the results of both commands, expecting a specific interleaving of the various
> output streams.
>
> Fix the FAIL by waiting for the result of the "set max-completion <n>" command
> before issuing another command.
>
> Tested on x86_64-linux.
>
> OK for trunk?
Looks good to me.
Thanks,
Andrew
>
> Thanks,
> - Tom
>
> [gdb/testsuite] Fix command result testing in mi-complete.exp
>
> gdb/testsuite/ChangeLog:
>
> 2019-07-23 Tom de Vries <tdevries@suse.de>
>
> PR testsuite/24711
> * gdb.mi/mi-complete.exp: Wait for "set max-completions" result before
> issuing next command.
>
> ---
> gdb/testsuite/gdb.mi/mi-complete.exp | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/gdb/testsuite/gdb.mi/mi-complete.exp b/gdb/testsuite/gdb.mi/mi-complete.exp
> index 692b004fd9..5b9613548f 100644
> --- a/gdb/testsuite/gdb.mi/mi-complete.exp
> +++ b/gdb/testsuite/gdb.mi/mi-complete.exp
> @@ -58,14 +58,16 @@ mi_gdb_test "-info-gdb-mi-command complete" \
>
> # Limit max completions and check that max_completions_reached=\"0\" is set
> # to 1.
> -send_gdb "set max-completions 1\n"
> +mi_gdb_test "set max-completions 1" ".*=cmd-param-changed.*\\^done" \
> + "set max-completions 1"
>
> mi_gdb_test "2-complete br" \
> ".*2\\^done,completion=\"br\[A-Za-z0-9-\]+\",matches=\\\[\"br\[A-Za-z0-9-\]+\"\\\],max_completions_reached=\"1\"" \
> "-complete br, max-completions 1"
>
> # Disable completions and check an error is returned
> -send_gdb "set max-completions 0\n"
> +mi_gdb_test "set max-completions 0" ".*=cmd-param-changed.*\\^done" \
> + "set max-completions 0"
>
> mi_gdb_test "3-complete br" \
> ".*3\\^error,msg=\".*" \