<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - brw_meta_fast_clear (brw=brw@entry=0x7fffd4097a08, fb=fb@entry=0x7fffd40fa900, buffers=buffers@entry=2, partial_clear=partial_clear@entry=false)" href="https://bugs.freedesktop.org/show_bug.cgi?id=86281#c20">Comment # 20</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - brw_meta_fast_clear (brw=brw@entry=0x7fffd4097a08, fb=fb@entry=0x7fffd40fa900, buffers=buffers@entry=2, partial_clear=partial_clear@entry=false)" href="https://bugs.freedesktop.org/show_bug.cgi?id=86281">bug 86281</a> from <a class="email" href="mailto:siglesias@igalia.com" title="Samuel Iglesias <siglesias@igalia.com>"> Samuel Iglesias</a> <pre>(In reply to Samuel Iglesias from <a href="show_bug.cgi?id=86281#c19">comment #19</a>) > I reproduced this bug on my SNB laptop and Mesa master (HEAD 7850774). I > found that just before crashing at brw_meta_fast_clear.c:451, it prints out > the following error: > > Failed to open BO for returned DRI2 buffer (1600x900, dri2 back buffer, > named 11). > This is likely a bug in the X Server that will lead to a crash soon. > > Which is printed at intel_process_dri2_buffer() when > drm_intel_bo_gem_create_from_name() returns a NULL pointer. Forgot to mention that when this error message is printed out, we return from intel_process_dri2_buffer() but the miptree was free'd before by intel_miptree_release(&rb->mt) call. Later on, we try to dereference it at brw_meta_fast_clear.c:451 and segmentation fault happens. > I added some > traces to that function at libdrm and found that drmIoctl(bufmgr_gem->fd, > DRM_IOCTL_GEM_OPEN, &open_arg) is returning an error, so this bug seems to > be produced by the kernel driver. > > My distro is Debian Jessie with a Linux kernel 3.14. > > Hope this helps.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>