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记录一次gdb coredump 调试经历
在板子上有个进程反复挂掉重启。把coredump文件下载回开发环境。
命令形式：
gdb xxx cored-xxx
/projects/hnd/tools/linux/hndtools-mips-linux-uclibc-4.9.3/usr/bin/mips-ugw-linux-uclibc-gdb netctrl core-netctrl-2044-1304208015-11
GNU gdb (GDB) 7.9.1
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=i686-pc-linux-gnu --target=mips-ugw-linux-uclibc".
Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
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<http://www.gnu.org/software/gdb/documentation/>.
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Type "apropos word" to search for commands related to "word"...
Reading symbols from netctrl...done.
[New LWP 2044]
warning: `/lib/libpthread.so.0': Shared library architecture unknown is not compatible with target architecture mips:isa32.
warning: `/lib/libgcc_s.so.1': Shared library architecture unknown is not compatible with target architecture mips:isa32.
warning: Could not load shared library symbols for 14 libraries, e.g. /lib/libcommon.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
Core was generated by `netctrl'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x77bd7bc8 in ?? ()
(gdb) set sysroot ../../../targets/O2V1.0/romfs/ ### 最重要的命令！！！！
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libcommon.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libm.so.0...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libz.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libpthread.so.0...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libapcommon.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libssdk_us_km.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libiofdrv.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libkm.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libenv.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libcm.so...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libwshared.so...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libc.so.0...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/ld-uClibc.so.0...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libdl.so.0...(no debugging symbols found)...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libgcc_s.so.1...done.
Reading symbols from ../../../targets/O2V1.0/romfs/lib/libutil.so.0...(no debugging symbols found)...done.
(gdb)
(gdb)
(gdb) bt
#0 0x77bd7bc8 in km_mac_filter_set_mode () from ../../../targets/O2V1.0/romfs/lib/libkm.so
#1 0x0041daa4 in mac_filter_apply_global_option () at api/src/behavior_manager/mac_filter_api.c:635
#2 0x0041e67c in mac_filter_init () at api/src/behavior_manager/mac_filter_api.c:862
#3 0x0040ba58 in netctrl_module_init_entry () at netctrl_module.c:530
#4 0x0040b084 in netctrl_init () at netctrl_main.c:2072
#5 0x0040b4b8 in mode_common () at netctrl_main.c:2148
#6 0x0040b724 in main (argc=1, argv=0x7faa7554) at netctrl_main.c:2181
(gdb)