On Wed, 31 Oct 2001, Aaron Bannert wrote:
> Apache also uses malloc() under the covers. Post a stack trace and we
> may be able to help.
>
> -aaron
>
I'll provide as much information about the install as I can.
Server info:
Configure line: ./configure --enable-ssl --enable-so --with-mpm=prefork
--enable-maintainer-mode
--with-mpm=prefork because threaded seems to be a mess at the moment,
--enable-maintainer-mode to (try to) build debugging data into httpd.
Server version string: Apache/2.0.27-dev (Unix) mod_ssl/3.0a0 OpenSSL/0.9.6
>From CVS, httpd-2.0 tree, October 22nd.
Same problem occurs with 2.0.26-dev snapshots.
Problem starts with #5 and goes up, the (!!) below is when I attempt to
hit the site with a web browser.. The same code snippits I'm using in the
TMySQLSet class work in other standalone applications with no visible
faults.
GDB output:
...
(gdb) set args -X
(gdb) exec httpd
(gdb) run
Starting program: /usr/local/apache2/bin/httpd -X
[New Thread 1024 (LWP 11156)]
(!!)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 11156)]
chunk_alloc (ar_ptr=0x40313a00, nb=16) at malloc.c:2877
2877 malloc.c: No such file or directory.
in malloc.c
(gdb) bt
#0 chunk_alloc (ar_ptr=0x40313a00, nb=16) at malloc.c:2877
#1 0x40261d3a in malloc_check (sz=11, caller=0x4033937e) at malloc.c:4645
#2 0x4025f06d in __libc_malloc (bytes=11) at malloc.c:2798
#3 0x4033937e in my_malloc (Size=11, MyFlags=16) at my_malloc.c:36
#4 0x4033958f in my_strdup (from=0x403278c0 "WebSession", MyFlags=16)
at my_malloc.c:81
#5 0x40336a23 in mysql_options (mysql=0x40313a10,
option=MYSQL_READ_DEFAULT_GROUP, arg=0x403278c0 "WebSession")
at libmysql.c:2283
#6 0x403210a3 in TMySQLSet::Configure (this=0x8199578)
at classtemplate/TMySQLSet.tmpl:26
#7 0x40320fe3 in TMySQLSet::TMySQLSet (this=0x8199578)
at classtemplate/TMySQLSet.tmpl:7
#8 0x40321218 in TWebSession::TWebSession (this=0x81a0d98)
at classtemplate/TWebSession.tmpl:7
#9 0x4032206b in websession_handler (r=0x81462ec) at main.cpp:145
#10 0x0809bef7 in ?? () at eval.c:41
#11 0x0809c67d in ?? () at eval.c:41
#12 0x08086758 in ?? () at eval.c:41
#13 0x0808144c in ?? () at eval.c:41
#14 0x080a8387 in ?? () at eval.c:41
#15 0x080a85d2 in ?? () at eval.c:41
#16 0x0809a6b2 in ?? () at eval.c:41
#17 0x0809a77c in ?? () at eval.c:41
#18 0x0809a8d7 in ?? () at eval.c:41
#19 0x0809adaa in ?? () at eval.c:41
#20 0x080a150b in ?? () at eval.c:41
#21 0x401fb627 in __libc_start_main (main=0x80a0edc, argc=2,
ubp_av=0xbffffb24, init=0x80617f4, fini=0x80c0330,
rtld_fini=0x4000dcd4 <_dl_fini>, stack_end=0xbffffb1c)
at ../sysdeps/generic/libc-start.c:129
(gdb) bt full
#0 chunk_alloc (ar_ptr=0x40313a00, nb=16) at malloc.c:2877
victim = 0x0
victim_size = 16
idx = 2
bin = 0x40313a00
remainder = 0xbfffd6c8
remainder_size = 2
remainder_index = 1076967952
block = 1077222432
startidx = 5
fwd = 0x40313a10
bck = 0x5
q = 0x40313a10
victim_size = 16
idx = 2
remainder = 0xbfffd6c8
remainder_index = 1076967952
block = 1077222432
#1 0x40261d3a in malloc_check (sz=11, caller=0x4033937e) at malloc.c:4645
victim = 0x10
nb = 16
#2 0x4025f06d in __libc_malloc (bytes=11) at malloc.c:2798
result = (void *) 0x40313a00
bytes = 1076967952
ar_ptr = (arena *) 0x40313a10
nb = 3221215064
victim = 0x5
hook = (void *(*)()) 0x40313a00 <main_arena>
nb = 3221215064
#3 0x4033937e in my_malloc (Size=11, MyFlags=16) at my_malloc.c:36
point = 0x4 <Address 0x4 out of bounds>
_db_func_ = 0x4034ac0f "mysql_option"
_db_file_ = 0x4034a488 "libmysql.c"
_db_level_ = 2
_db_framep_ = (char **) 0x403494a0
#4 0x4033958f in my_strdup (from=0x403278c0 "WebSession", MyFlags=16)
at my_malloc.c:81
ptr = 0x4034ac0f "mysql_option"
length = 11
#5 0x40336a23 in mysql_options (mysql=0x40313a10,
option=MYSQL_READ_DEFAULT_GROUP, arg=0x403278c0 "WebSession")
at libmysql.c:2283
mysql = (MYSQL *) 0x40313a10
option = MYSQL_READ_DEFAULT_GROUP
_db_func_ = 0x4034dee5 "?func"
_db_file_ = 0x4034deeb "?file"
_db_level_ = 1
_db_framep_ = (char **) 0xbfffd7d8
#6 0x403210a3 in TMySQLSet::Configure (this=0x8199578)
at classtemplate/TMySQLSet.tmpl:26
this = (TMySQLSet *) 0x8199578
#7 0x40320fe3 in TMySQLSet::TMySQLSet (this=0x8199578)
at classtemplate/TMySQLSet.tmpl:7
this = (TMySQLSet *) 0x8199578
#8 0x40321218 in TWebSession::TWebSession (this=0x81a0d98)
at classtemplate/TWebSession.tmpl:7
No locals.
#9 0x4032206b in websession_handler (r=0x81462ec) at main.cpp:145
WebSession = (TWebSession *) 0x80d8cb4
bapasswd = 0x80d8cb4 "D\231\r\b"
type = 0x80d8cb4 "D\231\r\b"
data = 0x40016b4c ""
rc = 0
child = (int (*)()) 0x8144a3c
handle = (void *) 0x808e7ad
error = 0xbfffd888 "\t\bb\024\bLk\001@\234\t\b\224d\024\bj\024\b\t"
#10 0x0809bef7 in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#11 0x0809c67d in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#12 0x08086758 in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#13 0x0808144c in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#14 0x080a8387 in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#15 0x080a85d2 in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#16 0x0809a6b2 in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#17 0x0809a77c in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#18 0x0809a8d7 in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#19 0x0809adaa in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#20 0x080a150b in ?? () at eval.c:41
ap = (void **) 0xbffffb24
digval = 1076967936
digval = 1076967936
digval = 1076967936
digval = 1076967936
p = 0x40016b4c ""
result = 3221224228
result = 1073834828
#21 0x401fb627 in __libc_start_main (main=0x80a0edc, argc=2,
ubp_av=0xbffffb24, init=0x80617f4, fini=0x80c0330,
rtld_fini=0x4000dcd4 <_dl_fini>, stack_end=0xbffffb1c)
at ../sysdeps/generic/libc-start.c:129
ubp_av = (char **) 0xbffffb24
fini = (void (*)()) 0x40016b4c <_dl_debug_mask>
rtld_fini = (void (*)()) 0x2 <__strtol_internal+2>
ubp_ev = (char **) 0xbffffb30
(gdb)
