Created attachment 24802 [details] Core dump backtrace including full 00:02.1 Display controller [0380]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a03] (rev 03) Debian sid on an core 2 duo, Linux 2.6.29.1 (Debian package), libdrm 2.4.9, intel 2.6.99.903, mesa 7.4 (Debian package) Kdm 4.2.2 starts fine, but when I try to login X crashes. Find attached Xorg log and configuration. I'm not sure so far what is to blame, but this is the Xorg core backtrace I got: #0 0x00007f59c4ff54af in ?? () from /lib/libgcc_s.so.1 #1 0x00007f59c4ff5d7b in _Unwind_Backtrace () from /lib/libgcc_s.so.1 #2 0x00007f59c5f2a45e in *__GI___backtrace (array=<value optimized out>, size=32) at ../sysdeps/x86_64/../ia64/backtrace.c:85 #3 0x00000000004ef046 in xorg_backtrace () at ../../os/backtrace.c:39 #4 0x0000000000484219 in xf86SigHandler (signo=11) at ../../../../hw/xfree86/common/xf86Events.c:385 #5 <signal handler called> #6 0x0000000000000002 in ?? () #7 0x00007f59c3ee72c4 in i965_prepare_composite (op=3, pSrcPicture=0x44ee1b0, pMaskPicture=0x0, pDstPicture=0x44ed590, pSrc=0x54ab8e0, pMask=0x0, pDst=0x50c3890) at ../../src/i965_render.c:1350 #8 0x00007f59c344b322 in exaTryDriverComposite (op=3 '\003', pSrc=0x44ee1b0, pMask=0x0, pDst=0x44ed590, xSrc=0, ySrc=0, xMask=<value optimized out>, yMask=<value optimized out>, xDst=<value optimized out>, yDst=<value optimized out>, width=<value optimized out>, height=<value optimized out>) at ../../exa/exa_render.c:670 #9 0x00007f59c344bcbf in exaComposite (op=3 '\003', pSrc=0x44ee1b0, pMask=0x0, pDst=0x44ed590, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=0, yDst=0, width=1280, height=800) at ../../exa/exa_render.c:935 #10 0x0000000000535828 in damageComposite (op=48 '0', pSrc=0x44ee1b0, pMask=0x0, pDst=0x44ed590, xSrc=0, ySrc=0, xMask=-19472, yMask=<value optimized out>, xDst=<value optimized out>, yDst=<value optimized out>, width=<value optimized out>, height=<value optimized out>) at ../../../miext/damage/damage.c:643 #11 0x000000000052de3a in ProcRenderComposite (client=0x44dff20) at ../../render/render.c:720 #12 0x000000000044d214 in Dispatch () at ../../dix/dispatch.c:437 #13 0x000000000043310d in main (argc=8, argv=0x7fffd03f60b8, envp=<value optimized out>) at ../../dix/main.c:397 I'm really blocked here because I have the same problem with 2.6.3 (also with drm 2.4.5). In this case, backtrace also explicitly mention drm_intel_bo_unreference. I've also tried options "NoAccel", "ExaNoComposite" and "NoDRI" with, if any, subtle differences in backtrace, so I'd point the same root cause. Same tests with 2.6.99.903 trying as well: "NoAccel", "ExaNoComposite", "NoDRI" and some combinations of them. Same scenario, with the exception of NoDRI, where I had a situation resembling #20956, once I applied Jesse's patch to libdrm I end up with the situation I'm describing in this bug. I've also tried UXA, login won't work as well but apparently for a different reason, if you are curious I can provide further information. This was for 2.6.3. UXA on 2.6.99.903 also failed for yet a different reason, but I'd like to focus here for EXA. I've been running this hardware using 2.6.1 and 2.4.5 libdrm so far acceptably well, but unfortunately I've been unable to go back to that situation. To conclude this is some info I got from core dump frame 7: (gdb) p pI830->gen4_render_state->composite_op $1 = {op = 3, source_picture = 0x3e93f50, mask_picture = 0x0, dest_picture = 0x3f02e00, source = 0x4efe2a0, mask = 0x0, dest = 0x4b16250, binding_table_bo = 0x437ac30, src_filter = SAMPLER_STATE_FILTER_NEAREST, mask_filter = SAMPLER_STATE_FILTER_NEAREST, src_extend = SAMPLER_STATE_EXTEND_NONE, mask_extend = SAMPLER_STATE_EXTEND_NONE, is_affine = 1, wm_kernel = WM_KERNEL_NOMASK_AFFINE} (gdb) p *pI830->gen4_render_state->composite_op->binding_table_bo $3 = {size = 4096, align = 0, offset = 34037760, virtual = 0x0, bufmgr = 0x143b420, handle = 745} (gdb) p *pI830->gen4_render_state->composite_op->binding_table_bo->bufmgr $5 = {bo_alloc = 0, bo_alloc_for_render = 0x2175640, bo_reference = 0x2185610, bo_unreference = 0x2, bo_map = 0x7f541555b000, bo_unmap = 0, bo_subdata = 0, bo_get_subdata = 0, bo_wait_rendering = 0x500000000000, destroy = 0, bo_emit_reloc = 0, bo_exec = 0xb1, bo_pin = 0x1000, bo_unpin = 0, bo_set_tiling = 0, bo_get_tiling = 0, bo_flink = 0x41b0d70, check_aperture_space = 0xf3, debug = 1} Looks like bufmgr is corrupted. Regards,
Created attachment 24803 [details] Xorg log.
Created attachment 24804 [details] Xorg configuration.
I think the patch from 20956 is wrong... But I guess you run into this problem even without it.
Update on this which made me relax a bit. I tried Debian Lenny versions, this is libdrm2.3.1, mesa 7.0.3, intel 2.3.2 and xserver 1.4.2. This time I booted with Lenny's Linux kernel 2.6.26. Suprisingly I reproduced the issue, and I pay attention that I was trying to login on kde4 failsafe mode, this is just konsole running and nothing more on the session. I then tried starting xfce with that configuration, it worked. Then real kde4, it worked as well. I upgraded back to sid, which is the configuration I starting describing, just that I went to intel 2.6.3. It worked again, I enabled desktop effects and so for it looks quite usable, just some regular, minor, glitches. What I don't have tried yet is starting the sid configuration having desktop effects from the begginning. My conclusion is that the kde4 failsafe mode is doing some operation that makes all crash, possibly corrupting memory or who knows what. At this point I'd be glad performing valgrind on this layout since the problem is quite reproducible. Is there any howto or tips to follow on that? I've never run valgrind on X. HTH,
The log shows a server regen occurring, and the bufmgr corruption looks roughly like the symptoms from the main server regen bug. *** This bug has been marked as a duplicate of bug 20516 ***
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