Bug 23806

Summary:

r600 + KMS: crash in R600Composite

Product:

xorg

Reporter:

Luca Tettamanti <kronos.it>

Component:

Driver/Radeon

Assignee:

xf86-video-ati maintainers <xorg-driver-ati>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

normal

Priority:

medium

Version:

git

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
X log	none
kernel log	none

Description Luca Tettamanti 2009-09-09 03:01:44 UTC

I'm currently testing drm-next from airlied tree (git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6.git, at revision cecc6b63), libdrm from git (master), radeon driver from git (master - 10a58d54), xserver 1.6.3. The card is a M56.
X crashes fairly often, I found that I can reproduce easily under KDE4 using krunner (alt+f2) and starting typing (X dies immediately).

A sample backtrace:
Backtrace:
0: /usr/bin/X11/X(xorg_backtrace+0x26) [0x4edff6]
1: /usr/bin/X11/X(xf86SigHandler+0x39) [0x4834f9]
2: /lib/libc.so.6 [0x7fc0567ccdb0]
3: /usr/lib/xorg/modules/drivers//radeon_drv.so [0x7fc054fe72fd]
4: /usr/lib/xorg/modules//libexa.so(exaCompositeRects+0x568) [0x7fc0548bacc8]
5: /usr/lib/xorg/modules//libexa.so(exaGlyphs+0x52d) [0x7fc0548b693d]
6: /usr/bin/X11/X [0x5343f1]
7: /usr/bin/X11/X [0x52e535]
8: /usr/bin/X11/X(Dispatch+0x364) [0x44d344]
9: /usr/bin/X11/X(main+0x3aa) [0x43329a]
10: /lib/libc.so.6(__libc_start_main+0xe6) [0x7fc0567b95c6]
11: /usr/bin/X11/X [0x432739]

(Side note: radeon_drv is compiled with "-O0 -g", still the backtrace is rather uninformative)

I've done a post mortem analysis with gdb (I've taken the base address of the relocated radeon_drv.so from the running server, crashed X and subtracted the base address from the address in the stack trace); the faulting address is 0x1042fd:

0x1042fd is in R600Composite (r600_exa.c:1857).
1855            vb = (pointer)((char*)accel_state->vb_ptr+accel_state->vb_index*16);
0x00000000001042cc <R600Composite+1123>:        mov    -0x10(%rbp),%rax
0x00000000001042d0 <R600Composite+1127>:        mov    0xc8(%rax),%rax
0x00000000001042d7 <R600Composite+1134>:        mov    %rax,%rdx
0x00000000001042da <R600Composite+1137>:        mov    -0x10(%rbp),%rax
0x00000000001042de <R600Composite+1141>:        mov    0xb0(%rax),%eax
0x00000000001042e4 <R600Composite+1147>:        shl    $0x4,%eax
0x00000000001042e7 <R600Composite+1150>:        cltq
0x00000000001042e9 <R600Composite+1152>:        lea    (%rdx,%rax,1),%rax
0x00000000001042ed <R600Composite+1156>:        mov    %rax,-0x8(%rbp)

1856
1857            vb[0] = (float)dstX;
0x00000000001042f1 <R600Composite+1160>:        cvtsi2ssl -0xbc(%rbp),%xmm0
0x00000000001042f9 <R600Composite+1168>:        mov    -0x8(%rbp),%rax
0x00000000001042fd <R600Composite+1172>:        movss  %xmm0,(%rax)


I'm attaching kernel and server logs.

Comment 1 Luca Tettamanti 2009-09-09 03:02:31 UTC

Created attachment 29346 [details]
X log

Comment 2 Luca Tettamanti 2009-09-09 03:02:48 UTC

Created attachment 29347 [details]
kernel log

Comment 3 Rafał Miłecki 2009-09-09 03:17:03 UTC

EXA is known to cause crashes on R6xx/R7xx. AStorm collected yesterday nice backtrace from his EXA crash:
http://dpaste.com/91252/

Comment 4 Luca Tettamanti 2009-09-09 03:19:41 UTC

(In reply to comment #3)
> EXA is known to cause crashes on R6xx/R7xx.

Note that I'm referring only to KMS from drm-next; the same setup without KMS is rock solid.

Comment 5 Rafał Miłecki 2009-09-09 03:22:15 UTC

(In reply to comment #4)
> (In reply to comment #3)
> > EXA is known to cause crashes on R6xx/R7xx.
> 
> Note that I'm referring only to KMS from drm-next; the same setup without KMS
> is rock solid.

Yes, I've meant that :) EXA works for me stable on not-KMS, the same for AStorm. Just in connection with KMS it crashes.

Comment 6 Rafał Miłecki 2009-09-10 03:35:42 UTC

Please try again with updated xf86-video-ati to today's master.

Comment 7 Luca Tettamanti 2009-09-10 09:06:55 UTC

(In reply to comment #6)
> Please try again with updated xf86-video-ati to today's master.

It seems that 0bb0ff0e fixed EXA related crashes.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.