Glibc 2.13 support about core_analyzer HOT 7 CLOSED

It shouldn't be difficult. You may look into the following files and compare with glibc's malloc.c of version 2.13. I don't have the environment to test and verify and hence didn't include this version.

• src/heap_ptmalloc.h
• src/heap_ptmalloc.cpp

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Thank you Michael. I looked at the malloc_state in glibc-2.13 and it looks very different. Adding this fails the copy methods as the struct members are very different from the rest.

#define MALLOC_STATE_MAGIC 0x444c4541l
#define MALLOC_STATE_VERSION (0_0x100l + 1l) /_ major*0x100 + minor */

struct malloc_state {
long magic;
long version;
mbinptr av[NAV * 2 + 2];
char* sbrk_base;
int sbrked_mem_bytes;
unsigned long trim_threshold;
unsigned long top_pad;
unsigned int n_mmaps_max;
unsigned long mmap_threshold;
int check_action;
unsigned long max_sbrked_mem;
unsigned long max_total_mem;
unsigned int n_mmaps;
unsigned int max_n_mmaps;
unsigned long mmapped_mem;
unsigned long max_mmapped_mem;
int using_malloc_checking;
};

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Could you try the branch glibc-2.13? I include this glibc version in core analyzer. Let me know if it works for you or not.

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Thank you very much Michael. It worked fine on one core. Another one, failed to obtain &main_arena from gdb. It complains variable doesnt exist. I have to look into the core / gdb further , again not an issue with core_analyzer.
Thank you again for adding support for glibc-2.13.

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Hi Michael,
I am trying to decode a core file. When I try to get the & or main_arena or mp_ from gdb, it is not finding the symbol. I also tried to attach to the running process and see if the symbol is there, but same result

(gdb) p malloc
$1 = {<text variable, no debug info>} 0x7fe50263d2b0
(gdb) p &main_arena
No symbol "main_arena" in current context.
(gdb) p &mp_
No symbol "mp_" in current context.

binary is not stripped.
file bcq
ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped

Greatly appreciate any insights.

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@rahulgopi
Since you get one core file working, you may want to check the environment of the core that doesn't work. main_arena and mp_ are variables in libc.so.

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I will reopen it when user data is available.

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