[PD-dev] libpd crasher bug from recent change to glist_delete()

[Miller Puckette]

Hi Rich and all -

I think I've tracked that down and fixed it... I just now pushed the change to
the git repo.

cheers
Miller

On Sun, Nov 27, 2011 at 11:15:46AM +1100, Rich E wrote:
> I just wanted to point out that the recent change to glist_delete() (commit
> here<http://pure-data.git.sourceforge.net/git/gitweb.cgi?p=pure-data/pure-data;a=blobdiff;f=src/g_graph.c;h=cdebbdc981bb35b24d55baaf4c401254b4c65aea;hp=57db6556efe9f60777f15b9d2e9d8f0c627c4aa0;hb=5c78db0883a3450e1cac727aee422ad7f4dd56eb;hpb=c7fb8e4a06d6253890ca2f73dfe4980c8c88fce9>)
> is causing crashes in libpd when closing patches.  Not sure if it is
> actually related, but it seems pretty similar to the bug already submitted
> here<http://sourceforge.net/tracker/?func=detail&atid=478070&aid=3433140&group_id=55736>,
> which appeared a few days after the commit that I linked to.  I'll place
> the backtrace here, indicating that there is a stale pointer that is being
> accessed somewhere (this is on an EXC_BAD_ACCESS):
> 
> (gdb) bt
> #0  0x00091e53 in obj_nexttraverseoutlet (lastconnect=0x7124740,
> destp=0xbfffd4b0, inletp=0xbfffd4b8, whichp=0xbfffd4c0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/m_obj.c:563
> #1  0x00035bcd in linetraverser_next (t=0xbfffd4a0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_canvas.c:258
> #2  0x00037caa in canvas_deletelinesforio (x=0x71230d0, text=0x7123ab0,
> inp=0x7123c70, outp=0x0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_canvas.c:788
> #3  0x00047009 in canvas_rminlet (x=0x7123ab0, ip=0x7123c70) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_graph.c:311
> #4  0x00054374 in vinlet_free (x=0x7123c00) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_io.c:86
> #5  0x000927f2 in pd_free (x=0x7123c00) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/m_pd.c:29
> #6  0x00046605 in glist_delete (x=0x7123ab0, y=0x7123c00) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_graph.c:122
> #7  0x00037892 in canvas_free (x=0x7123ab0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_canvas.c:709
> #8  0x000927f2 in pd_free (x=0x7123ab0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/m_pd.c:29
> #9  0x00046605 in glist_delete (x=0x71230d0, y=0x7123ab0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_graph.c:122
> #10 0x00037892 in canvas_free (x=0x71230d0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/g_canvas.c:709
> #11 0x000927f2 in pd_free (x=0x71230d0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/pure-data/src/m_pd.c:29
> #12 0x000bdfe7 in libpd_closefile (x=0x71230d0) at
> /Users/r/code/pd/Libpd/pd-for-ios/libpd/libpd_wrapper/z_libpd.c:343
> 
> 
> Cheers,
> Rich

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