openwrt进程异常崩溃，产生coredump，使用gdb分析，应该使用带调试的rootfs，而不是build_dir下的：
build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/root-ipq53xx/
应该使用：
staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/root-ipq53xx/
前者看不到异常调用栈。
arm-openwrt-linux-gdb bin/isp-dp /work/tftproot/isp-dp.21773.4.1720181268.core
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Reading symbols from bin/isp-dp...done.
[New LWP 21773]
warning: Can't read pathname for load map: Unknown error -1.
warning: Could not load shared library symbols for ./hookheap.so.
Do you need "set solib-search-path" or "set sysroot"?
Core was generated by `isp-dp -v'.
Program terminated with signal SIGILL, Illegal instruction.
#0 a_crash () at src/env/__stack_chk_fail.c:16
16 {
(gdb)
(gdb) bt
#0 a_crash () at src/env/__stack_chk_fail.c:16
#1 __stack_chk_fail () at src/env/__stack_chk_fail.c:17
#2 0x000172d4 in popen_get_strdup ()
#3 0x00017150 in platform_init ()
#4 0x00012c1c in main ()