Re: [bug report] blktests srp/002 hang

[Bob Pearson <rpearsonhpe@gmail.com>]

On 8/23/23 14:46, Bart Van Assche wrote:
> On 8/23/23 09:19, Bob Pearson wrote:
>> I have also seen the same hangs in siw. Not as frequently but the same symptoms.
>> About every month or so I take another run at trying to find and fix this bug but
>> I have not succeeded yet. I haven't seen anything that looks like bad behavior from
>> the rxe side but that doesn't prove anything. I also saw these hangs on my system
>> before the WQ patch went in if my memory serves. Out main application for this
>> driver at HPE is Lustre which is a little different than SRP but uses the same
>> general approach with fast MRs. Currently we are finding the driver to be quite stable
>> even under very heavy stress.
>>
>> I would be happy to collaborate with someone (you?) who knows the SRP side well to resolve
>> this hang. I think that is the quickest way to fix this. I have no idea what SRP is waiting for.
> 
> Hi Bob,
> 
> I cannot reproduce these issues. All SRP tests work reliably on my test setup on
> top of the v6.5-rc7 kernel, whether I use the siw driver or whether I use the
> rdma_rxe driver. Additionally, I do not see any SRP abort messages.

Thank you for this. This is good news.
> 
> # uname -a
> Linux opensuse-vm 6.5.0-rc7 #28 SMP PREEMPT_DYNAMIC Wed Aug 23 10:42:35 PDT 2023 x86_64 x86_64 x86_64 GNU/Linux
> # journalctl --since=today | grep 'SRP abort' | wc
>       0       0       0
> 
> Since I installed openSUSE Tumbleweed in the VM in which I run kernel tests: if
> you are using a Linux distro that is based on Debian it may include a buggy
> version of multipathd. Last time I ran the SRP tests in a Debian VM I had to
> build multipathd from source - the SRP tests did not work with the Debian version
> of multipathd. The shell script that I use to build and install multipathd is as
> follows (must be run in the multipath-tools source directory):

I run on Ubuntu which is Debian based. So perhaps that is the root of the problems
I have been seeing.

I'll try to follow your lead here.

Bob
> 
> #!/bin/bash
> 
> scriptdir="$(dirname "$0")"
> 
> if type -p zypper >/dev/null 2>&1; then
>     rpms=(device-mapper-devel libaio-devel libjson-c-devel librados-devel
>       liburcu-devel readline-devel systemd-devel)
>     for p in "${rpms[@]}"; do
>     sudo zypper install -y "$p"
>     done
> elif type -p apt-get >/dev/null 2>&1; then
>     export LIB=/lib
>     sudo apt-get install -y libaio-dev libdevmapper-dev libjson-c-dev librados-dev \
>         libreadline-dev libsystemd-dev liburcu-dev
> fi
> 
> git clean -f
> make -s "$@"
> sudo make -s "$@" install
> 
> Bart.