Re: Insight freezes when trying to debug Mozilla

[bstell at ix dot netcom dot com]

Thank you for the reply.

Fernando Nasser wrote:
> 
> bstell@ix.netcom.com wrote:
> >
> > I'm trying to debug Mozilla using Insight.
> >
> > When I run mozilla with the debug option the insight debugger comes
> > up and lets me start mozilla. I click the run button and it starts
> > and then does a break at main. When I press continue mozilla comes
> > up but insight never responds again (not screen refresh or button
> > response.
> >
> 
> I don't know much about your setup (you may be better off posting to the
> Mozzila list itself),

I am confused: Why would I post to the Mozilla list about insight
hanging?

> but it seems that gdb is waiting for the a Mozzila
> thread to stop and it never does. 

This seems to imply that the debugger depends on the application helping
the debugger. 

> Use the second gdb "up" command and see
> what is being done at  lin-lwp.c:766    I would guess it is a waitpid() call.
> You could see what the pid is, maybe trying sending it a SIGINT...

Line 766 of lin-lwp.c is calling sigsuspend().

> 
> The GUI hang because whoever wrote this wait for thread code did not include a
> call back to keep the GUI alive while waiting.
> 
> One thing I notice is that your line numbers are far off from the current
> version of the Linux thread support files (lin-lwp.c, thread-db.c etc).
> This may be an indication that there are fixes to these things that your
> version of gdb does not have.  Maybe you could also try a recent gdb snapshot
> (obtainable from sources.redhat.com).

For this test/message I downloaded/build/installed
"insight+dejagnu-20000930.tar.bz2" 
which build and installed a new gdb. 

This download included lin-lwp.c and thread-db.c which were compiled and
linked into the new gdb.

Do you think they are out of data or did you means something different?

> 
> Good luck,
> Fernando
> 
> > I am running version 20000930 (/usr/local/bin/gdb).
> >
> > I attached a second gdb to insight's gdb.
> > Here is the output for the xterm where I was running gdb on gdb:
> > =====================================================================
> >
> >     [root@localhost gdb]# /usr/bin/gdb /usr/local/bin/gdb
> >     GNU gdb 19991004
> >     Copyright 1998 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-redhat-linux"...
> >     Setting up the environment for debugging gdb.
> >     Breakpoint 1 at 0x810a062: file utils.c, line 735.
> >     Breakpoint 2 at 0x81074ff: file top.c, line 2897.
> >     (top-gdb) attach 22239
> >     Attaching to program: /usr/local/bin/gdb, Pid 22239
> >     Reading symbols from /usr/lib/libncurses.so.4...done.
> >     Reading symbols from /usr/X11R6/lib/libX11.so.6...done.
> >     Reading symbols from /lib/libdl.so.2...done.
> >     Reading symbols from /lib/libm.so.6...done.
> >     Reading symbols from /lib/libc.so.6...done.
> >     Reading symbols from /lib/ld-linux.so.2...done.
> >     Reading symbols from /lib/libthread_db.so.1...done.
> >     0x40140deb in __sigsuspend (set=0x83e36c0) at
> > ../sysdeps/unix/sysv/linux/sigsuspend.c:48
> >     48      ../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or
> > directory.
> >     (top-gdb) bt
> >     #0  0x40140deb in __sigsuspend (set=0x83e36c0) at
> > ../sysdeps/unix/sysv/linux/sigsuspend.c:48
> >     #1  0x80d1092 in lin_lwp_wait (pid=-1, ourstatus=0xbfffc074) at
> > lin-lwp.c:766
> >     #2  0x812dd11 in thread_db_wait (pid=-1, ourstatus=0xbfffc074) at
> > thread-db.c:710
> >     #3  0x80e1ad7 in gdbtk_wait (pid=-1, ourstatus=0xbfffc074) at
> > ./gdbtk/generic/gdbtk-hooks.c:694
> >     #4  0x80b269f in wait_for_inferior () at infrun.c:1286
> >     #5  0x80b252c in proceed (addr=4294967295,
> > siggnal=TARGET_SIGNAL_DEFAULT, step=0) at infrun.c:1085
> >     #6  0x80afba3 in continue_command (proc_count_exp=0x0, from_tty=0)
> > at infcmd.c:399
> >     #7  0x80e1666 in gdbtk_call_command (cmdblk=0x8418140, arg=0x0,
> > from_tty=0) at ./gdbtk/generic/gdbtk-hooks.c:513
> >     #8  0x8105915 in execute_command (p=0x89a4310 "", from_tty=0) at
> > top.c:1517
> >     #9  0x80dadb5 in gdb_immediate_command (clientData=0x80dace4,
> > interp=0x8424fb0, objc=2, objv=0x8425c68)
> >         at ./gdbtk/generic/gdbtk-cmds.c:892
> >     #10 0x80da888 in wrapped_call (opaque_args=0xbfffc284) at
> > ./gdbtk/generic/gdbtk-cmds.c:536
> >     #11 0x81048d9 in catch_errors (func=0x80da858 <wrapped_call>,
> > args=0xbfffc284, errstring=0x8356883 "", mask=6)
> >         at top.c:607
> >     #12 0x80da78e in call_wrapper (clientData=0x80dace4,
> > interp=0x8424fb0, objc=2, objv=0x8425c68)
> >         at ./gdbtk/generic/gdbtk-cmds.c:474
> >     #13 0x82ff5f9 in TclExecuteByteCode (interp=0x8424fb0,
> > codePtr=0x8789528) at ./../generic/tclExecute.c:955
> >     #14 0x82de521 in Tcl_EvalObj (interp=0x8424fb0, objPtr=0x853ccf8) at
> > ./../generic/tclBasic.c:2645
> >     #15 0x83297d1 in TclObjInterpProc (clientData=0x85a8d10,
> > interp=0x8424fb0, objc=1, objv=0x8425c64)
> >         at ./../generic/tclProc.c:996
> >     #16 0x82ff5f9 in TclExecuteByteCode (interp=0x8424fb0,
> > codePtr=0x89a4288) at ./../generic/tclExecute.c:955
> >     #17 0x82de521 in Tcl_EvalObj (interp=0x8424fb0, objPtr=0x897ac40) at
> > ./../generic/tclBasic.c:2645
> >     #18 0x82eb10d in Tcl_SwitchObjCmd (dummy=0x0, interp=0x8424fb0,
> > objc=3, objv=0x8425c58)
> >     ---Type <return> to continue, or q <return> to quit---q
> >      at ./../generic/tclCmdMZ.c:17Quit
> >     (top-gdb)
> >
> > Here is the output for the xterm where I was running mozilla:
> > =====================================================================
> >
> >     [bstell@localhost bin]$ ./mozilla -g 2>&1 | tee junk.mozilla.-g.log
> >     ./run-mozilla.sh -g ./mozilla-bin
> >     MOZILLA_FIVE_HOME=.
> >       LD_LIBRARY_PATH=.
> >          LIBRARY_PATH=.:./components
> >            SHLIB_PATH=.
> >               LIBPATH=.
> >            ADDON_PATH=.
> >           MOZ_PROGRAM=./mozilla-bin
> >           MOZ_TOOLKIT=
> >             moz_debug=1
> >          moz_debugger=
> >     which: no ddd in
> > (/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home/bstell/bin)
> >     Type Manifest File:
> > /home/bstell/work/moz/v1/mozilla/dist/bin/components/xpti.dat
> >     nsNativeComponentLoader: autoregistering begins.
> >     nsNativeComponentLoader: autoregistering succeeded
> >     nNCL: registering deferred (0)
> >     GFX: dpi=96 t2p=0.0666667 p2t=15 depth=24
> >     WEBSHELL+ = 1
> >
> > IsPluginFile(/home/bstell/work/moz/v1/mozilla/modules/plugin/default/unix/libnullplugin.so)
> >     LoadPlugin()
> > /home/bstell/work/moz/v1/mozilla/modules/plugin/default/unix/libnullplugin.so
> >     returned 8183558
> >     debug: edburns ns4xPlugin::CreatePlugin
> >     debug: edburns ns4xPlugin::CreatePlugin: cleared callbacks
> >     debug: edburns: ns4xPlugin::CreatePlugin: callbacks->newstream:
> > 0x41181c38
> >     plugin getvalue 1 called
> >     plugin getvalue 2 called
> >     plugin getmimedescription called
> >     GetMIMEDescription() returned "*:.*:All types"
> >     Registering plugin for: "*","All types",".*"
> >     Initialized app shell component
> > {18c2f989-b09f-11d2-bcde-00805f0e1353}, rv=0x00000000
> >     Initialized app shell component
> > {33e569b0-40f8-11d4-9a41-000064657374}, rv=0x00000000
> >     ProfileName : default
> >     ProfileDir  : /home/bstell/.mozilla/default
> >     CSSLoaderImpl::LoadAgentSheet: Load of URL
> > 'file:///home/bstell/.mozilla/default/chrome/use
> >     rChrome.css' failed.  Error code: 16389
> >     CSSLoaderImpl::LoadAgentSheet: Load of URL
> > 'file:///home/bstell/.mozilla/default/chrome/use
> >     rContent.css' failed.  Error code: 16389
> >     WEBSHELL+ = 2
> >     Enabling Quirk StyleSheet
> >     Note: verifyreflow is disabled
> >     Note: styleverifytree is disabled
> >     Note: frameverifytree is disabled
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bookmarks.js line 960:
> > redeclaration of var cmd
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bookmarks.js line 962:
> > redeclaration of var cmdReso
> >     urce
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://navigator/content/navigator.js line 1518: function
> > readFromClipboard does not alwa
> >     ys return a value
> >
> >     Start reading in bookmarks.html
> >     Finished reading in bookmarks.html  (735539 microseconds)
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/builtinURLs.js line 96: redeclaration
> > of var ds_uri
> >
> >     WEBSHELL+ = 3
> >     Enabling Quirk StyleSheet
> >     Setting content window
> >     *** Pulling out the charset
> >     JavaScript strict warning:
> >     chrome://navigator/content/navigator.js line 433: reference to
> > undefined property window.ar
> >     guments[1]
> >
> >     Loading page specified via openDialog
> >     Opening file cookperm.txt failed
> >     in SetSecurityButton
> >     Error loading URL http://www.mozilla.org/: 804b001e
> >     we don't handle eBorderStyle_close yet... please fix me
> >     WEBSHELL+ = 4
> >     WARNING: not calling OnDataAvailable, file
> > nsAsyncStreamListener.cpp, line 403
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://global/content/commonDialog.js line 122: redeclaration of
> > var containerID
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://global/content/commonDialog.js line 122: redeclaration of
> > var fieldID
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://global/content/commonDialog.js line 137: redeclaration of
> > var field
> >
> >     JavaScript strict warning:
> >     chrome://global/content/commonDialog.js line 30: assignment to
> > undeclared variable param
> >
> >     WEBSHELL+ = 5
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bm-panel.js line 122:
> > function OpenBookmarkURL does
> >      not always return a value
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bookmarks.js line 960:
> > redeclaration of var cmd
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bookmarks.js line 962:
> > redeclaration of var cmdReso
> >     urce
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bookmarksDD.js line 323:
> > redeclaration of var data
> >
> >     WARNING: waaah!, file nsXULPrototypeDocument.cpp, line 523
> >     JavaScript strict warning:
> >     chrome://communicator/content/bookmarks/bookmarksDD.js line 453:
> > redeclaration of var nodeI
> >     ndex
> >
> >     nsWidget::~nsWidget() of toplevel: 11 widgets still exist.
> >     WEBSHELL- = 4
> >     JavaScript strict warning:
> >      line 9: function onget does not always return a value
> >
> >     JavaScript strict warning:
> >      line 9: function onset does not always return a value
> 
> --
> Fernando Nasser
> Red Hat - Toronto                       E-Mail:  fnasser@cygnus.com