Created attachment 1107 [details]
实际结果因类似空指针这种，libsigsegv可正常捕获并处理段错误

[问题描述]：
Anolis23环境，libsigsegv软件包，安装 libsigsegv 的段错误处理程序sigsegv_install_handler后，栈溢出导致的段错误没有被成功捕捉而是程序直接退出了

[环境信息]：
机器类型：ECS

[内核信息]：
# uname -r -r
5.10.134-15.an23.x86_64

[操作系统信息]：
#  cat /etc/os-release
cat /etc/os-release
NAME="Anolis OS"
VERSION="23"
ID="anolis"
VERSION_ID="23"
PLATFORM_ID="platform:an23"
PRETTY_NAME="Anolis OS 23"
ANSI_COLOR="0;31"
HOME_URL="https://openanolis.cn/"
BUG_REPORT_URL="https://bugzilla.openanolis.cn/"

[重现步骤]：
1、环境上安装libsigsegv、libsigsegv-devel
2、创建捕获栈溢出段错误场景的C文件：
# cat bak_stack_over.c 
#include <stdio.h>
#include <stdlib.h>
#include <sigsegv.h>

/* 栈溢出处理函数 */
static int overflow_handler(void *fault_address, int serious)
{
    printf("Stack overflow detected at address: %p\\n", fault_address);
    exit(2);
    return 0; //上句已返回，不会执行
}

int main(void)
{
    /* 安装 libsigsegv 的栈溢出处理程序 */
    sigsegv_install_handler(overflow_handler);

    printf("Causing stack overflow...\\n");
    char large_array[1024 * 1024 * 10];
    large_array[0] = 1;

    /* 如果栈溢出处理程序可以正常恢复，以下行将不会执行 */
    printf("This line should not be executed.\\n");

    return 0;
}
3、编译gcc -o bak_stack_over bak_stack_over.c -lsigsegv  
4、执行strace ./bak_stack_over 

预期结果：
出现类似 Stack overflow detected at address: XXX的信息后程序退出

实际结果：收到SIGSEGV 信号后直接段错误程序直接对出
# strace ./bak_stack_over 
execve("./bak_stack_over", ["./bak_stack_over"], 0x7ffe772df910 /* 41 vars */) = 0
brk(NULL)                               = 0x1721000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffee7dc1e50) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc9068ad000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=14143, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 14143, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc9068a9000
close(3)                                = 0
openat(AT_FDCWD, "/lib64/libsigsegv.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=20016, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 20552, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc9068a3000
mmap(0x7fc9068a4000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7fc9068a4000
mmap(0x7fc9068a6000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fc9068a6000
mmap(0x7fc9068a7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fc9068a7000
close(3)                                = 0
openat(AT_FDCWD, "/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\3206\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2203056, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 1932592, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc9066cb000
mmap(0x7fc9066ed000, 1396736, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7fc9066ed000
mmap(0x7fc906842000, 339968, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x177000) = 0x7fc906842000
mmap(0x7fc906895000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c9000) = 0x7fc906895000
mmap(0x7fc90689b000, 32048, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc90689b000
close(3)                                = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc9066c8000
arch_prctl(ARCH_SET_FS, 0x7fc9066c8740) = 0
set_tid_address(0x7fc9066c8a10)         = 47920
set_robust_list(0x7fc9066c8a20, 24)     = 0
rseq(0x7fc9066c9060, 0x20, 0, 0x53053053) = 0
mprotect(0x7fc906895000, 16384, PROT_READ) = 0
mprotect(0x7fc9068a7000, 4096, PROT_READ) = 0
mprotect(0x403000, 4096, PROT_READ)     = 0
mprotect(0x7fc9068df000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x7fc9068a9000, 14143)           = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7ffee73c1e98} ---
+++ killed by SIGSEGV (core dumped) +++
Segmentation fault (core dumped)

[问题发生概率]：必现