linux-kernel - Re: PROBLEM: Hang in selftests/netfilter/nft_trans

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Message-ID: <714c3712-a390-ac60-40d4-c759b326e3c5@alu.unizg.hr>
Date:   Tue, 3 Jan 2023 22:17:49 +0100
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     Florian Westphal <fw@...len.de>
Cc:     linux-kselftest@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>, Jakub Kicinski <kuba@...nel.org>
Subject: Re: PROBLEM: Hang in selftests/netfilter/nft_trans_stress.sh

On 03. 01. 2023. 17:11, Florian Westphal wrote:
> Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr> wrote:
>>> Can you send me the output of 'bash -x nft_trans_stress.sh'?
>>> It should tell which command/program isn't making progress.
>>
>> Hi, Florian!
>>
>> Well, when ran alone, the script ended successfully:
>>
>> root@...vin-IdeaPad-3-15ITL6:/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/netfilter# bash nft_trans_stress.sh
>> PASS: nft add/delete test returned 0
>> PASS: nft reload test returned 0
>> PASS: nft add/delete with nftrace enabled test returned 0
>> PASS: nft add/delete with nftrace enabled test returned 0
>> root@...vin-IdeaPad-3-15ITL6:/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/netfilter#
>>
>> There was no stall after "nft reload test" in a standalone superuser run.
> 
> Hmm.  Does this patch make it work when running via 'make kselftest'?
> 
> diff --git a/tools/testing/selftests/netfilter/nft_trans_stress.sh b/tools/testing/selftests/netfilter/nft_trans_stress.sh
> --- a/tools/testing/selftests/netfilter/nft_trans_stress.sh
> +++ b/tools/testing/selftests/netfilter/nft_trans_stress.sh
> @@ -10,12 +10,20 @@
>   ksft_skip=4
>   
>   testns=testns-$(mktemp -u "XXXXXXXX")
> +tmp=""
>   
>   tables="foo bar baz quux"
>   global_ret=0
>   eret=0
>   lret=0
>   
> +cleanup() {
> +	ip netns pids "$testns" | xargs kill 2>/dev/null
> +	ip netns del "$testns"
> +
> +	rm -f "$tmp"
> +}
> +
>   check_result()
>   {
>   	local r=$1
> @@ -43,6 +51,7 @@ if [ $? -ne 0 ];then
>   	exit $ksft_skip
>   fi
>   
> +trap cleanup EXIT
>   tmp=$(mktemp)
>   
>   for table in $tables; do
> @@ -139,11 +148,4 @@ done
>   
>   check_result $lret "add/delete with nftrace enabled"
>   
> -pkill -9 ping
> -
> -wait
> -
> -rm -f "$tmp"
> -ip netns del "$testns"
> -
>   exit $global_ret

I've got the following output:

make[2]: Entering directory '/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/netfilter'
TAP version 13
1..17
# selftests: netfilter: nft_trans_stress.sh
# PASS: nft add/delete test returned 0
# PASS: nft reload test returned 0
#
not ok 1 selftests: netfilter: nft_trans_stress.sh # TIMEOUT 45 seconds
# selftests: netfilter: nft_fib.sh
# PASS: fib expression did not cause unwanted packet drops

It did not hang, but still did not finish all 4 tests correctly like when ran standalone:

root@...vin-IdeaPad-3-15ITL6:/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/netfilter# time ./nft_trans_stress.sh
PASS: nft add/delete test returned 0
PASS: nft reload test returned 0
PASS: nft add/delete with nftrace enabled test returned 0
PASS: nft add/delete with nftrace enabled test returned 0

real	1m11.014s
user	0m6.470s
sys	0m20.344s
root@...vin-IdeaPad-3-15ITL6:/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/netfilter#

I hope we're closer to the solution.

Kind regards,
Mirsad

--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
-- 
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union