[Bug 91688] New: segfault in glyphs_fallback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91688

            Bug ID: 91688
           Summary: segfault in glyphs_fallback
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: NetBSD
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: prlw1 at cam.ac.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

cpu0: "Intel(R) Atom(TM) CPU D525   @ 1.80GHz"
    Vendor Name: Intel (0x8086)
    Device Name: Pineview Integrated Graphics Device (0xa001)
xf86-videl-intel 2.99.917

This is the same box as the one in Bug 91083, and is running with the
additional trap-prevention patch in bug 91083 comment 6.

One advantage of firefox 40 being less stable, is it seems easier to reproduce
crashes(!) Opening a new bug, as I see the crash with the other bug's patch,
which I think was meant to reduce traps. (I also removed the NetBSD work
around)

(This was just clicking on a tab in firefox - nothing to do with video
playback)

sna_glyphs.c:
1756                    if (sigtrap_get() == 0) {



#0  0x00007f7ff425f214 in __sigsetjmp14 () from /usr/lib/libc.so.12
(gdb) bt
#0  0x00007f7ff425f214 in __sigsetjmp14 () from /usr/lib/libc.so.12
#1  0x00007f7fefa7207b in glyphs_fallback (op=op at entry=12 '\f', 
    src=src at entry=0x7f7ff4db5d80, dst=dst at entry=0x7f7ff193c000, 
    mask_format=mask_format at entry=0x0, src_x=src_x at entry=59, 
    src_y=src_y at entry=55, nlist=<optimized out>, nlist at entry=1, 
    list=0x7f7fffffd730, list at entry=0x7f7fffffd720, glyphs=0x7f7fffffcfc0, 
    glyphs at entry=0x7f7fffffcf20)
    at /usr/xsrc/external/mit/xf86-video-intel/dist/src/sna/sna_glyphs.c:1756
#2  0x00007f7fefa72fc3 in sna_glyphs (op=<optimized out>, src=0x7f7ff4db5d80, 
    dst=0x7f7ff193c000, mask=0x0, src_x=<optimized out>, 
    src_y=<optimized out>, nlist=1, list=0x7f7fffffd720, glyphs=0x7f7fffffcf20)
    at /usr/xsrc/external/mit/xf86-video-intel/dist/src/sna/sna_glyphs.c:2049
#3  0x0000000000505dc4 in damageGlyphs (op=<optimized out>, 
    pSrc=0x7f7ff4db5d80, pDst=0x7f7ff193c000, maskFormat=0x0, 
    xSrc=<optimized out>, ySrc=<optimized out>, nlist=1, list=0x7f7fffffd720, 
    glyphs=0x7f7fffffcf20)
    at /usr/xsrc/external/mit/xorg-server/dist/miext/damage/damage.c:695
#4  0x00000000004f8ccd in CompositeGlyphs (op=<optimized out>, 
    pSrc=0x7f7ff4db5d80, pDst=0x7f7ff193c000, maskFormat=0x0, 
    xSrc=<optimized out>, ySrc=<optimized out>, nlist=nlist at entry=1, 
    lists=lists at entry=0x7f7fffffd720, glyphs=glyphs at entry=0x7f7fffffcf20)
    at /usr/xsrc/external/mit/xorg-server/dist/render/glyph.c:604
#5  0x00000000004ee3a3 in ProcRenderCompositeGlyphs (client=0x7f7ff4d0c560)
    at /usr/xsrc/external/mit/xorg-server/dist/render/render.c:1440
#6  0x00000000004eb545 in ProcRenderDispatch (client=<optimized out>)
    at /usr/xsrc/external/mit/xorg-server/dist/render/render.c:2057
#7  0x00000000004540d5 in Dispatch ()
    at /usr/xsrc/external/mit/xorg-server/dist/dix/dispatch.c:431
#8  0x000000000043010a in main (argc=6, argv=0x7f7fffffdc58, 
    envp=<optimized out>)
    at /usr/xsrc/external/mit/xorg-server/dist/dix/main.c:287

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