[Bug 74096] New: EXA uninitialized crash when DRI2 disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74096

          Priority: medium
            Bug ID: 74096
          Assignee: xorg-driver-ati at lists.x.org
           Summary: EXA uninitialized crash when DRI2 disabled
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: dylan at dylex.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

xorg-server-1.15.0 xf86-video-ati-7.3.0 (also seen with previous versions)

Log excerpts:

(--) RADEON(0): Chipset: "ATI Mobility Radeon HD 5000 Series" (ChipID = 0x68e1)
(II) Loading /pkg/xorg-server-1.15.0/lib/xorg/modules/libexa.so
(II) Module exa: vendor="X.Org Foundation"
        compiled for 1.15.0, module version = 2.6.0
...
(==) RADEON(0): Backing store enabled
(WW) RADEON(0): Direct rendering disabled
(II) RADEON(0): Acceleration enabled
(**) RADEON(0): DPMS enabled
(==) RADEON(0): Silken mouse enabled
(II) RADEON(0): Textured video requires CP on R5xx/R6xx/R7xx/IGP
(II) RADEON(0): RandR 1.2 enabled, ignore the following RandR disabled message.
(--) RandR disabled
(II) AIGLX: Loaded and initialized swrast
(II) GLX: Initialized DRISWRAST GL provider for screen 0
Xorg: /src/xorg-server-1.15.0/src/include/privates.h:122: dixGetPrivateAddr:
Assertion `key->initialized' failed.

backtrace:
#0  0x00007f912157d899 in __GI_raise (sig=sig at entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007f912157ee27 in __GI_abort () at abort.c:89
#2  0x00007f9121576866 in __assert_fail_base (fmt=0x7f91216b4128 "%s%s%s:%u:
%s%sAssertion `%s' failed.\n%n", assertion=assertion at entry=0x7f911e0f209b
"key->initialized", file=file at entry=0x7f911e0f1fc0
"/src/xorg-server-1.15.0/src/include/privates.h", line=line at entry=122,
function=function at entry=0x7f911e0f2850 <__PRETTY_FUNCTION__.8617>
"dixGetPrivateAddr") at assert.c:92
#3  0x00007f9121576922 in __GI___assert_fail
(assertion=assertion at entry=0x7f911e0f209b "key->initialized",
file=file at entry=0x7f911e0f1fc0
"/src/xorg-server-1.15.0/src/include/privates.h", line=line at entry=122,
function=function at entry=0x7f911e0f2850 <__PRETTY_FUNCTION__.8617>
"dixGetPrivateAddr") at assert.c:101
#4  0x00007f911e0e2520 in dixGetPrivateAddr (key=<optimized out>,
key=<optimized out>, privates=<optimized out>) at
/src/xorg-server-1.15.0/src/include/privates.h:122
#5  0x00007f911e0e477a in dixGetPrivateAddr (key=<optimized out>,
key=<optimized out>, privates=<optimized out>) at
/src/xorg-server-1.15.0/src/exa/exa.c:1149
#6  dixGetPrivate (key=0x7f911e2f6820 <exaScreenPrivateKeyRec>,
privates=<optimized out>) at /src/xorg-server-1.15.0/src/include/privates.h:137
#7  exaMoveInPixmap (pPixmap=<optimized out>) at
/src/xorg-server-1.15.0/src/exa/exa.c:1142
#8  0x00007f911eba3b28 in drmmode_create_bo_pixmap (width=1920, height=1200,
depth=24, bpp=32, pitch=7680, tiling=tiling at entry=0, bo=bo at entry=0x12460e0,
psurf=psurf at entry=0x0, pScrn=<optimized out>, pScrn=<optimized out>) at
/src/xf86-video-ati-7.3.0/src/src/drmmode_display.c:111
#9  0x00007f911eba41d6 in create_pixmap_for_fbcon (drmmode=0x12460e0,
drmmode=0x12460e0, fbcon_id=0, pScrn=0x11ff3c0) at
/src/xf86-video-ati-7.3.0/src/src/drmmode_display.c:343
#10 drmmode_copy_fb (pScrn=pScrn at entry=0x11ff3c0,
drmmode=drmmode at entry=0x11ffc88) at
/src/xf86-video-ati-7.3.0/src/src/drmmode_display.c:386
#11 0x00007f911eba5f44 in drmmode_set_desired_modes
(pScrn=pScrn at entry=0x11ff3c0, drmmode=drmmode at entry=0x11ffc88) at
/src/xf86-video-ati-7.3.0/src/src/drmmode_display.c:1826
#12 0x00007f911eba0388 in RADEONCreateScreenResources_KMS (pScreen=0x1209930)
at /src/xf86-video-ati-7.3.0/src/src/radeon_kms.c:223
#13 0x00000000004a1366 in xf86CrtcCreateScreenResources (screen=0x1209930) at
/src/xorg-server-1.15.0/src/hw/xfree86/modes/xf86Crtc.c:709
#14 0x0000000000438636 in dix_main (argc=6, argv=0x7fff12c03eb8,
envp=<optimized out>) at /src/xorg-server-1.15.0/src/dix/main.c:221
#15 0x00007f9121569bb5 in __libc_start_main (main=0x424390 <main>, argc=6,
argv=0x7fff12c03eb8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff12c03ea8) at libc-start.c:269
#16 0x00000000004243c1 in _start () at ../sysdeps/x86_64/start.S:122

It appears that, since direct rendering is disabled, exaDriverInit is never
called, but exaMoveInPixmap is called anyway, leading to the crash.

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