Re: [dpdk-dev] [dpdk-stable] [PATCH] net/failsafe: fix fd leak

[Ali Alnubani <alialnu@mellanox.com>]

> -----Original Message-----
> From: Gaëtan Rivet <grive@u256.net>
> Sent: Monday, May 4, 2020 7:22 PM
> To: Ali Alnubani <alialnu@mellanox.com>
> Cc: Ferruh Yigit <ferruh.yigit@intel.com>; wangyunjian
> <wangyunjian@huawei.com>; dev@dpdk.org; jerry.lilijun@huawei.com;
> xudingke@huawei.com; stable@dpdk.org; Raslan Darawsheh
> <rasland@mellanox.com>
> Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] net/failsafe: fix fd leak
> 
> On 03/05/20 11:33 +0000, Ali Alnubani wrote:
> > Hi,
> >
> > > -----Original Message-----
> > > From: dev <dev-bounces@dpdk.org> On Behalf Of Ferruh Yigit
> > > Sent: Monday, April 27, 2020 7:56 PM
> > > To: Gaëtan Rivet <grive@u256.net>; wangyunjian
> > > <wangyunjian@huawei.com>
> > > Cc: dev@dpdk.org; jerry.lilijun@huawei.com; xudingke@huawei.com;
> > > stable@dpdk.org
> > > Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] net/failsafe: fix fd
> > > leak
> > >
> > > On 4/27/2020 12:12 PM, Gaëtan Rivet wrote:
> > > > On 27/04/20 18:44 +0800, wangyunjian wrote:
> > > >> From: Yunjian Wang <wangyunjian@huawei.com>
> > > >>
> > > >> Zero is a valid fd. The fd won't be closed thus leading fd leak,
> > > >> when it is zero.
> > > >>
> > > >> Fixes: f234e5bd996d ("net/failsafe: register slaves Rx
> > > >> interrupts")
> > > >> Fixes: 9e0360aebf23 ("net/failsafe: register as Rx interrupt
> > > >> mode")
> > > >> Cc: stable@dpdk.org
> > > >>
> > > >
> > > > Hello Yunjian,
> > > >
> > > > Nothing prevents a DPDK app from closing 0 and getting it from
> > > > another call, good catch.
> > > >
> > > >> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> > > >
> > > > Acked-by: Gaetan Rivet <grive@u256.net>
> > >
> > > Applied to dpdk-next-net/master, thanks.
> >
> > This patch is causing Testpmd to quit when I issue a "port stop" command.
> Testpmd log:
> >
> > """
> > x86_64-native-linuxapp-gcc/build/app/test-pmd/testpmd -n 4 -- -i
> > --forward-mode=mac
> > EAL: Detected 8 lcore(s)
> > EAL: Detected 1 NUMA nodes
> > EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
> > EAL: Selected IOVA mode 'PA'
> > EAL: No available hugepages reported in hugepages-1048576kB
> > EAL: Probing VFIO support...
> > EAL: PCI device 0002:00:02.0 on NUMA socket 0
> > EAL:   probe driver: 15b3:1004 net_mlx4
> > Interactive-mode selected
> > Set mac packet forwarding mode
> > Warning: NUMA should be configured manually by using --port-numa-config
> and --ring-numa-config parameters along with --numa.
> > testpmd: create a new mbuf pool <mbuf_pool_socket_0>: n=203456,
> > size=2176, socket=0
> > testpmd: preferred mempool ops selected: ring_mp_mc
> >
> > Warning! port-topology=paired and odd forward ports number, the last port
> will pair with itself.
> >
> > Configuring Port 1 (socket 0)
> > Port 1: 00:15:5D:26:2B:00
> > Checking link statuses...
> > Done
> > testpmd> port stop 1
> > Stopping ports...
> > Checking link statuses...
> > Done
> > testpmd>
> > Stopping port 1...
> > Stopping ports...
> > Done
> >
> > Shutting down port 1...
> > Closing ports...
> > Done
> >
> > Bye...
> > """
> >
> > My terminal gets broken at this point, and I have to reinitialize it with a
> "reset".
> >
> > - Ali
> 
> Hi Ali,
> 
> Thanks for the report, I am looking into it.
> 
> Are you testing failsafe on Azure?

This reproduces with Failsafe, but not necessarily on Azure. You can try to reproduce on any platform if you pass something like '-w 00:00.0 --vdev="net_failsafe0,dev(0000:08:00.0)"'.

> 
> I see a segfault currently at startup, so in any case there are fixes to be
> pushed.
> I'll see afterward if I need a specific platform to reproduce your bug.
> 
> Regards,
> --
> Gaëtan

Regards,
Ali