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Date: Tue, 6 Mar 2001 04:25:57 +0100
From: Marcus Brinkmann <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: mtrace triggers SIGBUS at first malloc
Message-ID: <[EMAIL PROTECTED]>
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Sender: Marcus Brinkmann <[EMAIL PROTECTED]>
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Package: libc0.2
Version: 2.2.2-1
Hi,
mtrace() triggers SIGBUS on a server binary.
I tested the following patch to ext2fs:
--- gnu/cvs/hurd/ext2fs/ext2fs.c Mon Jan 8 23:27:01 2001
+++ gnu/hurd/hurd/hurd-20010111/ext2fs/ext2fs.c Tue Mar 6 03:57:38 2001
@@ -28,6 +28,7 @@
#include <error.h>
#include <argz.h>
#include <argp.h>
+#include <mcheck.h>
#include <hurd/store.h>
#include <version.h>
#include "ext2fs.h"
@@ -166,6 +167,9 @@
{
error_t err;
mach_port_t bootstrap;
+
+ setenv("MALLOC_TRACE", "/tmp/mtrace", 1);
+ mtrace();
/* Initialize the diskfs library, parse arguments, and open the store.
This starts the first diskfs thread for us. */
The below transcript is the result. Note that this doesn't happen for a very
simple test case that only calls setenv/mtrace/malloc.
Thanks,
Marcus
Script started on Tue Mar 6 04:08:15 2001
hurd:~# gdb /hurd/ext2fs.mtrace
GNU gdb 5.0
Copyright 2000 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-unknown-gnu0.2"...
(gdb) run
Starting program: /hurd/ext2fs.mtrace
Program received signal SIGBUS, Bus error.
0x11e4910 in _dl_addr (address=0x804cce9, info=0x124fc4c) at dl-addr.c:67
67 dl-addr.c: No such file or directory.
(gdb) bt full
#0 0x11e4910 in _dl_addr (address=0x804cce9, info=0x124fc4c) at dl-addr.c:67
l = (struct link_map *) 0x124fc4c
match = (struct link_map *) 0x207c8
symtab = (Elf32_Sym *) 0x207c8
matchsym = (Elf32_Sym *) 0x8048034
strtab = 0x8 <Address 0x8 out of bounds>
#1 0x1143c75 in tr_where (caller=0x804cce9) at mtrace.c:99
info = {dli_fname = 0x169cb "", dli_fbase = 0x0,
dli_sname = 0x8 <Address 0x8 out of bounds>, dli_saddr = 0xddc9}
#2 0x1144074 in tr_mallochook (size=8, caller=0x804cce9) at mtrace.c:171
size = 8
hdr = (void *) 0x8056e30
#3 0x1140516 in __libc_malloc (bytes=8) at malloc.c:2701
result = (void *) 0x1021c40
bytes = 133064
ar_ptr = (arena *) 0x124fe20
nb = 133064
victim = 0x8056a08
#4 0x804cce9 in parse_opt (key=16777219, arg=0x0, state=0x124fe20)
at ../../ext2fs/ext2fs.c:106
key = 16915520
state = (struct argp_state *) 0x124fe20
values = (struct {...} *) 0x0
#5 0x11c32bc in group_parse (group=0x8056a08, state=0x124fe20, key=16777219,
---Type <return> to continue, or q <return> to quit---
arg=0x0) at argp-parse.c:279
group = (struct group *) 0x8056a08
state = (struct argp_state *) 0x124fe20
#6 0x11c382d in parser_init (parser=0x124fe04, argp=0x124fd84, argc=1,
argv=0x124ff64, flags=8, input=0x124fea0) at argp-parse.c:566
argp = (struct argp *) 0x124fe20
argc = 16915520
input = (void *) 0x1021c40
err = 0
group = (struct group *) 0x8056a08
szs = {short_len = 115, long_len = 38, num_groups = 7,
num_child_inputs = 7}
#7 0x11c3fdd in __argp_parse (argp=0x124fd84, argc=1, argv=0x124ff64,
flags=8, end_index=0x0, input=0x124fea0) at argp-parse.c:931
err = 16915520
parser = {argp = 0x124fd84,
short_opts = 0x8056db4 "-DS:C:rws::nSEAT:mI:L?V", long_opts = 0x8056b44,
groups = 0x8056a08, egroup = 0x8056b04, child_inputs = 0x8056b28,
try_getopt = 1, state = {root_argp = 0x124fd84, argc = 1, argv = 0x124ff64,
next = 0, flags = 8, arg_num = 0, quoted = 0, input = 0x124fea0,
child_inputs = 0x8056b28, hook = 0x0, name = 0x0, err_stream = 0x80568b0,
out_stream = 0x8056858, pstate = 0x124fe04}, storage = 0x8056a08}
arg_ebadkey = 0
#8 0x103eb24 in diskfs_init_main () from /lib/libdiskfs.so.0.2
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#9 0x804cadf in main (argc=1, argv=0x124ff64) at ../../ext2fs/ext2fs.c:176
argc = 1
argv = (char **) 0x124ff64
err = 16915520
bootstrap = 19201816
#10 0x10f7720 in __libc_start_main (main=0x804caa0 <main>, argc=1,
ubp_av=0x124ff64, init=0x804a1c4 <_init>, fini=0x8052a5c <_fini>,
rtld_fini=0xe6a0 <_dl_fini>, stack_end=0x124ff5c)
at ../sysdeps/generic/libc-start.c:129
fini = (void (*)()) 0x20700 <_dl_debug_impcalls>
rtld_fini = (void (*)()) 0x124fc4c
ubp_ev = (char **) 0x1021c40
(gdb) x/5i $pc
0x11e4910 <_dl_addr+176>: mov (%eax),%eax
0x11e4912 <_dl_addr+178>: mov %eax,(%ecx)
0x11e4914 <_dl_addr+180>: mov 0x14c(%edx),%eax
0x11e491a <_dl_addr+186>: mov %eax,0x4(%ecx)
0x11e491d <_dl_addr+189>: mov 0xfffffff4(%ebp),%edx
(gdb) i reg
eax 0x1021c40 16915520
ecx 0x124fc4c 19201100
edx 0x207c8 133064
ebx 0x12014b8 18879672
esp 0x124fb64 0x124fb64
ebp 0x124fb8c 0x124fb8c
esi 0x8048034 134512692
edi 0x8 8
eip 0x11e4910 0x11e4910
eflags 0x10246 66118
cs 0x17 23
ss 0x1f 31
ds 0x1f 31
es 0x1f 31
fs 0x1f 31
gs 0x1f 31
fctrl 0x0 0
fstat 0x0 0
ftag 0x0 0
fiseg 0x0 0
fioff 0x0 0
foseg 0x0 0
fooff 0x0 0
fop 0x0 0
(gdb) The program is running. Exit anyway? (y or n) y
hurd:~# exit
Script done on Tue Mar 6 04:09:04 2001
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org [EMAIL PROTECTED]
Marcus Brinkmann GNU http://www.gnu.org [EMAIL PROTECTED]
[EMAIL PROTECTED]
http://www.marcus-brinkmann.de
---------------------------------------
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Date: Sun, 27 May 2001 03:01:28 +0200
From: Marcus Brinkmann <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: fixed
Message-ID: <[EMAIL PROTECTED]>
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Sender: Marcus Brinkmann <[EMAIL PROTECTED]>
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mtrace in servers (-lthreads) works since Marks glibc change from 2001-03-24
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org [EMAIL PROTECTED]
Marcus Brinkmann GNU http://www.gnu.org [EMAIL PROTECTED]
[EMAIL PROTECTED]
http://www.marcus-brinkmann.de
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