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MDEV-6479 stack traces in 10.1

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Take into account that PIE binaries are loaded at some offset, so
addresses cannot be directly resolved with addr2line. Find this
offset and subtract it before resolving an address.
This commit is contained in:
Sergei Golubchik
2015-02-28 13:51:22 +01:00
parent 7ba2916c55
commit c78f594bbc
4 changed files with 20 additions and 4 deletions
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20
mysys/my_addr_resolve.c
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@@ -126,12 +126,20 @@ err:
*/
#elif defined(MY_ADDR_RESOLVE_FORK)
/*
yet another - just execute addr2line or eu-addr2line, whatever available,
pipe the addresses to it, and parse the output
yet another - just execute addr2line pipe the addresses to it, and parse the
output
*/
#include <m_string.h>
#include <ctype.h>
#if defined(HAVE_LINK_H) && defined(HAVE_DLOPEN)
#include <link.h>
static ElfW(Addr) offset= 0;
#else
#define offset 0
#endif
static int in[2], out[2];
static int initialized= 0;
static char output[1024];
@@ -140,7 +148,7 @@ int my_addr_resolve(void *ptr, my_addr_loc *loc)
char input[32], *s;
size_t len;
len= my_snprintf(input, sizeof(input), "%p\n", ptr);
len= my_snprintf(input, sizeof(input), "%p\n", ptr - offset);
if (write(in[1], input, len) <= 0)
return 1;
if (read(out[0], output, sizeof(output)) <= 0)
@@ -172,6 +180,12 @@ const char *my_addr_resolve_init()
{
pid_t pid;
#if defined(HAVE_LINK_H) && defined(HAVE_DLOPEN)
struct link_map *lm = (struct link_map*) dlopen(0, RTLD_NOW);
if (lm)
offset= lm->l_addr;
#endif
if (pipe(in) < 0)
return "pipe(in)";
if (pipe(out) < 0)