DPDK: vrouter crashed in __memcpy_sse2_

[Vinod Nair]

vrouter crashed in __memcpy_sse2_unaligned on sending flood ping from VM with mtu 6K
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/contrail-vrouter-dpdk --no-daemon --socket-mem 1024 1024'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:37
37 ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S: No such file or directory.
(gdb) bt
#0 __memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:37
#1 0x00000000004dc264 in memcpy (__len=<optimized out>, __src=<optimized out>, __dest=0x7f17a6e3f820) at /usr/include/x86_64-linux-gnu/bits/string3.h:51
#2 eth_af_packet_tx (queue=0x7f1798ab6260, bufs=0x7f1798ab18d0, nb_pkts=1) at /ecbuilds/PipeLine/sb/third_party/dpdk/drivers/net/af_packet/rte_eth_af_packet.c:209
#3 0x000000000040f7de in rte_eth_tx_burst (nb_pkts=<optimized out>, tx_pkts=0x7f1798ab18d0, queue_id=0, port_id=<optimized out>)
    at /ecbuilds/PipeLine/sb/build/production/vrouter/dpdk/x86_64-native-linuxapp-gcc/include/rte_ethdev.h:2685
#4 send_burst (p=0x7f1798ab18c0) at /ecbuilds/PipeLine/sb/third_party/dpdk/lib/librte_port/rte_port_ethdev.c:201
#5 rte_port_ethdev_writer_flush (port=0x7f1798ab18c0) at /ecbuilds/PipeLine/sb/third_party/dpdk/lib/librte_port/rte_port_ethdev.c:280
#6 0x00000000004efa24 in vr_dpdk_lcore_flush (lcore=0x7f1798f185c0) at vrouter/include/vr_dpdk.h:705
#7 dpdk_lcore_fwd_loop () at vrouter/dpdk/vr_dpdk_lcore.c:1376
#8 0x00000000004f05ef in vr_dpdk_lcore_launch (dummy=<optimized out>) at vrouter/dpdk/vr_dpdk_lcore.c:1564
#9 0x00000000004345c5 in eal_thread_loop (arg=<optimized out>) at /ecbuilds/PipeLine/sb/third_party/dpdk/lib/librte_eal/linuxapp/eal/eal_thread.c:184
#10 0x00007f17ac41e182 in start_thread (arg=0x7f17a8e43700) at pthread_create.c:312
#11 0x00007f17abf4447d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb)

Build : 2717 Kilo

[Raja Sivaramakrishnan (raja-u)]

In dpdk_af_packet_if_add(), frames is set to the default value of 2K, but the packet can be more than that if jumbo frames are enabled. The crash happened when memcpying a packet > 2K to the AF packet iov. Need to set frame sizein the af_packet interface to account for jumbo packets.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/17919
Submitter: Andriy Berestovskyy (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/17920
Submitter: Andriy Berestovskyy (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/17920
Committed: http://github.org/Juniper/contrail-vrouter/commit/e846848bc66ac1b6fe034445870c094b3a07acfa
Submitter: Zuul
Branch: master

commit e846848bc66ac1b6fe034445870c094b3a07acfa
Author: Andriy Berestovskyy <email address hidden>
Date: Fri Feb 26 17:33:38 2016 +0100

DPDK: fix AF_PACKET frame size

Change-Id: I7a329480bd3cad5c1dab1657a533f85ccccf63a2
Closes-bug: #1549567

[Raja Sivaramakrishnan (raja-u)]

Vinod, please close if you don't see the issue. Thanks.

[Vinod Nair (vinodnair)]

Issue is not seen