2018/05/11_Libtrace Parallel + DPDK 程式待解Bugs

1. clock 沒有變 >> uint64_t 不可用%d

2. thread幾次就印幾次 >> 每個thread印出來順序不同 >> print function 位置要移動!

3. segmentation fault

Make sure your system doesn't set the core dump file size to zero. You can set it to unlimited with:

        ulimit -c unlimited

Careful though! that core dumps can become huge.

第929行 per_packet 內有錯誤的記憶體讀取或寫入

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x00000000004044af in per_packet (trace=0x693c000, t=0x693d640, global=0x0, tls=0x7f106c002180, packet=0x7f106c001e60) at lp_stash_5t_trace_interval.cc:929

929 src_ip_uint = ntohl(ip->ip_src.s_addr);

[Current thread is 1 (Thread 0x7f107e9e7700 (LWP 20987))]

3.A.

原因是在讀到第一萬多個ip的時候會得到一個 ip == NULL 導致第929行要去拿ip struct裡面的source IP時有非法的指標存取造成。

原本erman程式碼裡面有做這個判斷，拿掉的原因是因為 void function / return 跟 static function / return 的問題

這邊判斷式用 ip != NULL

Compile and Run commands

sudo rm test *.txt core

sudo gcc -g -o test * -Wall -ltrace -lm

sudo ./test ~/Desktop/equinix-sanjose.dirA.20120119-130000-mac.UTC.anon.pcap 5

Git

git config --global user.email "glennshih@bitbucket.org"

git config --global user.name "glennshih"

git add .

git commit -m ""

git push -u origin master

gdb

gdb -q test

set args ~/Desktop/equinix-sanjose.dirA.20120119-130000-mac.UTC.anon.pcap

b 數字

Setting core dump and Use gdb

ulimit -c unlimited

sudo gdb ./test core

Page updated

Report abuse