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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - sna_driver causes X-server to get SIGSEGV"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95185#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - sna_driver causes X-server to get SIGSEGV"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95185">bug 95185</a>
from <span class="vcard"><a class="email" href="mailto:jason.vas.dias@gmail.com" title="Jason Vas Dias <jason.vas.dias@gmail.com>"> <span class="fn">Jason Vas Dias</span></a>
</span></b>
<pre>There are a few other places where the xf86-video-intel code
core dumps on access to rq->bo - here are the ones I've found:
$ diff -U0 kgem.c~ kgem.c
--- kgem.c~ 2016-04-25 23:32:41.073898879 +0000
+++ kgem.c 2016-04-28 18:04:21.161610936 +0000
@@ -2734,2 +2734,3 @@
- if (__kgem_busy(kgem, rq->bo->handle))
- break;
+ if( (NULL != rq) && (NULL != rq->bo) )
+ if (__kgem_busy(kgem, rq->bo->handle))
+ break;
@@ -2789 +2790 @@
- kgem->retire(kgem);
+ if(NULL != kgem->retire) kgem->retire(kgem);
@@ -2804 +2805 @@
-
+ if( (NULL != rq) && (NULL != rq->bo) )
@@ -2827 +2828,2 @@
- if (__kgem_busy(kgem, rq->bo->handle)) {
+ if( (NULL != rq) && (NULL != rq->bo) )
+ if (__kgem_busy(kgem, rq->bo->handle)) {
@@ -2832,3 +2834,3 @@
- }
-
- DBG(("%s: ring=%d idle (handle=%d)\n",
+ }
+ if( (NULL != rq) && (NULL != rq->bo) )
+ DBG(("%s: ring=%d idle (handle=%d)\n",
@@ -2970,4 +2972,4 @@
-
- if (kgem->fence[rq->ring] == NULL &&
- __kgem_busy(kgem, rq->bo->handle))
- kgem->fence[rq->ring] = rq;
+ if (kgem->fence[rq->ring] == NULL)
+ if( (NULL != rq) && (NULL != rq->bo) )
+ if( __kgem_busy(kgem, rq->bo->handle) )
+ kgem->fence[rq->ring] = rq;
The X-Server no longer coredumps, the display just goes black and
the machine hangs on window manager start - it also happens with twm .
I guess I'll have to wait until I get access to another machine in order
to debug Xserver with GDB & get to the bottom of the problem.</pre>
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