[Bug 93848] New: [sna] Random X-Server crashes and freezes after update

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93848

            Bug ID: 93848
           Summary: [sna] Random X-Server crashes and freezes after update
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: gentoo at gishpuppy.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121260
  --> https://bugs.freedesktop.org/attachment.cgi?id=121260&action=edit
full Xorg log

Since my last system update (including an update of xorg-server and libdrm) I
have random X-Server crashes and freezes. With xf86-video-intel-2.99.917-r2,
which worked fine before the update, I got "Fatal server error:
has_coherent_ptr:1532 assertion '!priv->cpu_bo->needs_flush' failed" (see bug
#90053), so I switched to xf86-video-intel-9999 (Git).
Now I get errors like this:

[  5166.629] (EE) Backtrace:
[  5166.629] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x58c3c6]
[  5166.629] (EE) 1: /usr/bin/X (0x400000+0x190609) [0x590609]
[  5166.629] (EE) 2: /lib64/libc.so.6 (0x7f45ddf8b000+0x33400) [0x7f45ddfbe400]
[  5166.629] (EE) 3: /lib64/libc.so.6 (0x7f45ddf8b000+0x78e68) [0x7f45de003e68]
[  5166.629] (EE) 4: /lib64/libc.so.6 (__libc_calloc+0xd5) [0x7f45de006675]
[  5166.630] (EE) 5: /usr/bin/X (0x400000+0x33265) [0x433265]
[  5166.630] (EE) 6: /usr/bin/X (0x400000+0x36367) [0x436367]
[  5166.630] (EE) 7: /usr/bin/X (0x400000+0x3a486) [0x43a486]
[  5166.630] (EE) 8: /lib64/libc.so.6 (__libc_start_main+0xf0) [0x7f45ddfab7b0]
[  5166.630] (EE) 9: /usr/bin/X (_start+0x29) [0x424999]
[  5166.630] (EE) 
[  5166.630] (EE) Segmentation fault at address 0x0
[  5166.630] (EE) 
Fatal server error:
[  5166.630] (EE) Caught signal 11 (Segmentation fault). Server aborting

I created two backtraces using gdb, I don't know if they are helpful. The
second one indicates that the Intel driver is involved. If this a xorg-server
issue please reassign.

I have a dual head setup (using ZaphodHeads) - don't know if it is important.

My configuration:

System: Intel Celeron G1840
OS: Gentoo Linux
Kernel: 4.4.0
xorg-server: 1.17.4
libdrm: 2.4.65

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