Bug 16662

Created attachment 17618 [details]
dmalloc log file running dbus-daemon --introspect

Hi,

I'm trying to get dbus 1.2.1 working on an SGI Octane2 machine running IRIX 6.5.30. I'm using MipsPro 7.4.3m compiler. I've compiled all kinds of complex, modern free software on this platform (X.Org 7.3 libraries, Gtk+, Cairo, etc.) so it should be capable of running also dbus. Expat 2.0.1 is compiled under the prefix /opt/local. This is the basic configure settings for non-modified dbus-1.2.1 source when not using special malloc library.

CC='cc -n32 -mips4 -c99' CPPFLAGS='-I/opt/local/include' LDFLAGS='-L/opt/local/lib' ./configure --prefix=/scratch/tmp/dbus/orig --without-init-scripts --with-xml=expat

When running dbus-daemon compiled like this with --introspect argument, it will die with "Bus error (core dumped)" message without printing anything. The file introspect-stacktrace-orig.txt contains the stack trace obtained with the dbx debugger.

I then configured dbus by linking everything against SpeedShop memory allocation library (http://www.techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?cmd=getdoc&coll=0650&db=man&fname=3%20malloc_ss) by adding -lmalloc_ss to LDFLAGS shown above in order to get some trace info about the problem. When running with default trace settings, this gets printed:

(15:42:25)(root@saraswati)(/scratch/tmp/dbus/dbus-1.2.1-malloc_ss/bus)$ ./dbus-daemon --introspect
SSmalloc error (Process 1419844): overrun address (0x10090260), tail guard @0x1009038e is corrupt
SSmalloc error (Process 1419844): failed realloc (0x10090260, 604); returned NULL pointer
SSmalloc error (Process 1419844): memory area @0x10090260 has already been freed
Can not introspect - Out of memory

and with tracing

(15:46:26)(root@saraswati)(/scratch/tmp/dbus/dbus-1.2.1-malloc_ss/bus)$ _SSMALLOC_TRACING=1 _SPEEDSHOP_VERBOSE=1 ./dbus-daemon --introspect
SSmalloc: SpeedShop debugging malloc library (-lmalloc_ss) initialization
        _SPEEDSHOP_VERBOSE = 1
        _SSMALLOC_TRACING: enabled
        _SSMALLOC_FASTCHK: enabled
        _SSMALLOC_FULLWARN: disabled
        _SSMALLOC_MAXMALLOC = 0 (==> no maximum)
        _SSMALLOC_NO_REUSE: disabled
        _SSMALLOC_CLEAR_MALLOC: disabled
        _SSMALLOC_CLEAR_FREE: disabled
ssmalloclog event #1 = 0, 0x100900b0, 8, 0x00000000, error = 0
    0 PCs:
ssmalloclog event #2 = 0, 0x100900d0, 8, 0x00000000, error = 0
    0 PCs:
ssmalloclog event #3 = 0, 0x100900f0, 8, 0x00000000, error = 0
    0 PCs:
ssmalloclog event #4 = 0, 0x10090110, 8, 0x00000000, error = 0
    0 PCs:
ssmalloclog event #5 = 1, 0x100901b0, 151, 0x10090110, error = 0
    0 PCs:
ssmalloclog event #6 = 1, 0x10090260, 302, 0x100901b0, error = 0
    0 PCs:
SSmalloc error (Process 1420500): overrun address (0x10090260), tail guard @0x1009038e is corrupt
ssmalloclog event #7 = 3, 0x00000000, 0, 0x10090260, error = 13
    0 PCs:
SSmalloc error (Process 1420500): failed realloc (0x10090260, 604); returned NULL pointer
ssmalloclog event #8 = 3, 0x00000000, 604, 0x10090260, error = 3
    0 PCs:
SSmalloc error (Process 1420500): memory area @0x10090260 has already been freed
ssmalloclog event #9 = 3, 0x00000000, 0, 0x10090260, error = 10
    0 PCs:
ssmalloclog event #10 = 2, 0x10090260, 0, 0x00000000, error = 0
    0 PCs:
Can not introspect - Out of memory

Finally I compiled dbus against dmalloc library http://dmalloc.com adding -DDMALLOC -DDMALLOC_FUNC_CHECK to the CPPFLAGS when configuring and #include <dmalloc.h> to each C file. Full dmalloc trace log file is attached as introspect-dmalloc.log.

I hope this is useful for tracing the problem. I'm glad to help any way possible, like providing shell access to the machine if somebody wants do further debug this..