我的apache错误日志中填写了如下条目。
[Tue Dec 20 21:18:16.037877 2016] [core:notice] [pid 2067] AH00051: child pid 12421 exit signal Aborted (6), possible coredump in /tmp
*** Error in `/usr/sbin/apache2': free(): invalid next size (fast): 0x00007f3dfdec01d0 ***
[Tue Dec 20 21:18:53.105789 2016] [core:notice] [pid 2067] AH00051: child pid 12716 exit signal Aborted (6), possible coredump in /tmp
*** Error in `/usr/sbin/apache2': realloc(): invalid next size: 0x00007f3dfe9b0470 ***
我无法找到问题的原因。我打开了核心转储，无法真正理解它。我正在寻找有关如何调试此问题的指示。
核心转储输出： ％sudo gdb / usr / sbin / apache2 core
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
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Reading symbols from /usr/sbin/apache2...Reading symbols from /usr/lib/debug//usr/sbin/apache2...done.
done.
[New LWP 11290]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning: the debug information found in "/usr/lib/debug//usr/lib/php5/20121212/mysql.so" does not match "/usr/lib/php5/20121212/mysql.so" (CRC mismatch).
warning: the debug information found in "/usr/lib/debug/usr/lib/php5/20121212/mysql.so" does not match "/usr/lib/php5/20121212/mysql.so" (CRC mismatch).
warning: the debug information found in "/usr/lib/debug//usr/lib/php5/20121212/mysqli.so" does not match "/usr/lib/php5/20121212/mysqli.so" (CRC mismatch).
warning: the debug information found in "/usr/lib/debug/usr/lib/php5/20121212/mysqli.so" does not match "/usr/lib/php5/20121212/mysqli.so" (CRC mismatch).
warning: the debug information found in "/usr/lib/debug//usr/lib/php5/20121212/pdo_mysql.so" does not match "/usr/lib/php5/20121212/pdo_mysql.so" (CRC mismatch).
warning: the debug information found in "/usr/lib/debug/usr/lib/php5/20121212/pdo_mysql.so" does not match "/usr/lib/php5/20121212/pdo_mysql.so" (CRC mismatch).
Core was generated by `/usr/sbin/apache2 -k restart'.
Program terminated with signal SIGABRT, Aborted.
#0 0x00007f3dfae2dc37 in __GI_raise (sig=sig@entry=6)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt full
#0 0x00007f3dfae2dc37 in __GI_raise (sig=sig@entry=6)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
resultvar = 0
pid = 11290
selftid = 11290
#1 0x00007f3dfae31028 in __GI_abort () at abort.c:89
save_stage = 2
act = {__sigaction_handler = {sa_handler = 0x7f3dfbd256e8,
sa_sigaction = 0x7f3dfbd256e8}, sa_mask = {__val = {139904184910772,
139899969732630, 139899969732608, 139899969732609, 140735729349512,
139904184909536, 0, 140735729348896, 139899969732640, 0, 4224794192,
140735729348792, 140735729348816, 140735729348788, 139904194526800,
139904194540776}}, sa_flags = -70163096, sa_restorer = 0x7f3dfbd17178}
sigs = {__val = {32, 0 <repeats 15 times>}}
#2 0x00007f3dfae6a2a4 in __libc_message (do_abort=do_abort@entry=1,
fmt=fmt@entry=0x7f3dfaf786b0 "*** Error in `%s': %s: 0x%s ***\n")
at ../sysdeps/posix/libc_fatal.c:175
ap = {{gp_offset = 40, fp_offset = 32573, overflow_arg_area = 0x7fff9727b330,
reg_save_area = 0x7fff9727b2c0}}
fd = 2
on_2 = <optimized out>
list = <optimized out>
nlist = <optimized out>
cp = <optimized out>
written = <optimized out>
#3 0x00007f3dfae74ff7 in malloc_printerr (action=<optimized out>,
str=0x7f3dfaf74905 "realloc(): invalid next size", ptr=<optimized out>)
at malloc.c:4996
buf = "00007f3dfe4d6030"
cp = <optimized out>
#4 0x00007f3dfae78827 in _int_realloc (av=<optimized out>, oldp=0x7f3dfe4d6020,
oldsize=<optimized out>, nb=<optimized out>) at malloc.c:4234
newp = <optimized out>
newsize = <optimized out>
newmem = <optimized out>
next = <optimized out>
remainder = <optimized out>
remainder_size = <optimized out>
bck = <optimized out>
fwd = <optimized out>
copysize = <optimized out>
ncopies = <optimized out>
s = <optimized out>
d = <optimized out>
errstr = <optimized out>
__func__ = "_int_realloc"
nextsize = <optimized out>
#5 0x00007f3dfae79ed9 in __GI___libc_realloc (oldmem=0x7f3dfe4d6030, bytes=5)
at malloc.c:3029
ar_ptr = 0x7f3dfb1b5760 <main_arena>
nb = 32
oldp = 0x7f3dfe4d6020
oldsize = 32
__func__ = "__libc_realloc"
#6 0x00007f3dfa3889be in ?? ()
No symbol table info available.
#7 0x00007f3dfbd25290 in ?? ()
No symbol table info available.
#8 0x0000000000000033 in ?? ()
No symbol table info available.
#9 0x00007f3d00000004 in ?? ()
No symbol table info available.
#10 0x000000000000021f in ?? ()
No symbol table info available.
#11 0x0000000100000005 in ?? ()
No symbol table info available.
#12 0x00007f3dfbcf3247 in ?? ()
No symbol table info available.
#13 0x00007f3dfbd1fdb8 in ?? ()
No symbol table info available.
#14 0x00007f3dfbd13e50 in ?? ()
No symbol table info available.
#15 0x0000000000000000 in ?? ()
No symbol table info available.
（GDB）
加载的Apache模块：
core_module (static)
so_module (static)
watchdog_module (static)
http_module (static)
log_config_module (static)
logio_module (static)
version_module (static)
unixd_module (static)
authz_cache_module (shared)
access_compat_module (shared)
alias_module (shared)
auth_basic_module (shared)
authn_core_module (shared)
authn_file_module (shared)
authz_core_module (shared)
authz_host_module (shared)
authz_user_module (shared)
autoindex_module (shared)
deflate_module (shared)
dir_module (shared)
env_module (shared)
expires_module (shared)
filter_module (shared)
headers_module (shared)
mime_module (shared)
mpm_prefork_module (shared)
negotiation_module (shared)
php5_module (shared)
remoteip_module (shared)
rewrite_module (shared)
setenvif_module (shared)
socache_shmcb_module (shared)
ssl_module (shared)
status_module (shared)