Date: Mon, 17 Apr 2006 18:03:46 -0400 From: Joe Marcus Clarke <marcus@FreeBSD.org> To: Pascal Hofstee <caelian@gmail.com> Cc: gnome@FreeBSD.org Subject: Re: gnome-session [mc-gnome] on amd64 problems. Message-ID: <444410C2.8040907@FreeBSD.org> In-Reply-To: <d8a0b7620604171445h5d5b4b8bnfd6577dcc0cdfb12@mail.gmail.com> References: <d8a0b7620604171445h5d5b4b8bnfd6577dcc0cdfb12@mail.gmail.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Pascal Hofstee wrote: > Hi, > > It looks like i stumbled across some pointer-truncation in the current > MC-gnome gnome-session port on amd64. > I'll try to outline the problem as i understand it below .. any assistence > here would be appreciated. > > in ${WORKDIR}/gnome-session/gsm-xrandr.c there's a function called > "gsm_set_display_properties" > at line 134 the following call get's made: > > client = gsm_get_conf_client (); > > client is defined in the function definition as GConfClient *client; > (this definition is inside an #ifdef HAVE_RANDR .. i have tried moving it > outside the ifdef to no avail though). > > I have stepped through the gsm_get_conf_client() call in a gdb session .. > and everything seems to be alright including the function's return call. The > function tries to return a valid 64-bit pointer. > > However .. immediately after the assignment has been done. client now points > to a (truncated) 32-bit address. > This obviously causes a problem whenever client is used to get any gconf > data, which in turn causes gnome-session to segfault. > My first guess is that somehow the storagesize/datatype for GConfClient is > being obscured causing the compiler to default it to a 32bit integer, which > would explain the sudden pointer truncation upon assignment. > > I currently do not have an actual backtrace available .. as i am not writing > this on my FreeBSD system. > > > If anybody has any idea why the pointer gets truncated to 32bit in this > case, please enlighten me so i can try to test potential fixes. Fixed. Joe - -- Joe Marcus Clarke FreeBSD GNOME Team :: gnome@FreeBSD.org FreeNode / #freebsd-gnome http://www.FreeBSD.org/gnome -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFERBDCb2iPiv4Uz4cRAlwdAJ9KyB7/jzJ0sd0FacaTbkD98MWaIQCeOTbG UXc0q0ARW0nEcIi2s37UaFo= =qWVb -----END PGP SIGNATURE-----
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