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Date: Thu, 16 May 2019 10:34:02 +0000
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Subject: [dpdk-dev] [Bug 279] Unaligned memory access when reading ipv6
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https://bugs.dpdk.org/show_bug.cgi?id=3D279
Bug ID: 279
Summary: Unaligned memory access when reading ipv6 header
Product: DPDK
Version: 19.02
Hardware: x86
OS: Linux
Status: CONFIRMED
Severity: normal
Priority: Normal
Component: examples
Assignee: dev@dpdk.org
Reporter: mplaneta@os.inf.tu-dresden.de
Target Milestone: ---
Hello,
I'm running l3fwd application in a following way:
sudo ./build/l3fwd -l 2-3 -n 2 --vdev=3Dnet_tap0 --vdev=3Dnet_tap1=20
--vdev=3Dnet_tap2 -- -p 0xe -E --parse-ptype --config=3D"(1,0,3),(2,0,3=
)"
And it fails with following output:
EAL: Detected 4 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: No free hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
EAL: PCI device 0000:00:1f.6 on NUMA socket -1
EAL: Invalid NUMA socket, default to 0
EAL: probe driver: 8086:15d8 net_e1000_em
soft parse-ptype is enabled
Skipping disabled port 0
Initializing port 1 ... Creating queues: nb_rxq=3D1 nb_txq=3D2...=20
Address:AE:00:CE:7A:B1:50, Destination:02:00:00:00:00:01, Allocated mbuf po=
ol
on socket 0
Hash: Adding 0x4 keys
txq=3D2,0,0 txq=3D3,1,0=20
Initializing port 2 ... Creating queues: nb_rxq=3D1 nb_txq=3D2...=20
Address:F6:CE:D9:39:29:D2, Destination:02:00:00:00:00:02, txq=3D2,0,0 txq=
=3D3,1,0=20
Initializing port 3 ... Creating queues: nb_rxq=3D0 nb_txq=3D2...=20
Address:92:18:9B:13:E1:EF, Destination:02:00:00:00:00:03, txq=3D2,0,0 txq=
=3D3,1,0=20
Initializing rx queues on lcore 2 ...=20
Initializing rx queues on lcore 3 ... rxq=3D1,0,0 rxq=3D2,0,0=20
Port 1: softly parse packet type info
Port 2: softly parse packet type info
Checking link statusdone
Port1 Link Up. Speed 10000 Mbps -full-duplex
Port2 Link Up. Speed 10000 Mbps -full-duplex
Port3 Link Up. Speed 10000 Mbps -full-duplex
L3FWD: entering main loop on lcore 3
L3FWD: -- lcoreid=3D3 portid=3D1 rxqueueid=3D0
L3FWD: -- lcoreid=3D3 portid=3D2 rxqueueid=3D0
L3FWD: lcore 2 has nothing to do
[1] 13769 segmentation fault sudo ./build/l3fwd -l 2-3 -n 2 --vdev=3Dne=
t_tap0
--vdev=3Dnet_tap1 --vdev=3Dnet_tap
In the debugger I see that the reason point to unaligned memory access in
following instruction:
0x5555555de474 <em_get_ipv6_dst_port+12> vmovdqa 0x14(%rdi),%xmm2
Where
p/x $rdi + 0x14
$3 =3D 0x100694162
The instruction point to following line of function em_get_ipv6_dst_port:
key.xmm[1] =3D *(xmm_t *)data1;
I compiled DPDK with following command:
make -j4 install EXTRA_CFLAGS=3D"-ggdb3 -O0" T=3Dx86_64-native-linuxapp-gcc
DESTDIR=3D$(pwd)/../dpdk-install prefix=3D
And used the same CFLAGS for l3fwd
System information
$ lscpu=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 39 bits physical, 48 bits virtual
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 142
Model name: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz
Stepping: 9
CPU MHz: 915.480
CPU max MHz: 3100.0000
CPU min MHz: 400.0000
BogoMIPS: 5424.00
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 3072K
NUMA node0 CPU(s): 0-3
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge m=
ca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64
monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2
x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm
3dnowprefetch cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriori=
ty
ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rd=
seed
adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat=
pln
pts hwp hwp_notify hwp_act_window hwp_epp
$ gcc --version
gcc (Debian 8.2.0-14) 8.2.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
--=20
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