Help with debuging Xserver / Goes in an infinite loop

Joshua C. joshuacov at googlemail.com
Tue Oct 6 08:52:18 UTC 2009 

2009/10/6 "Jóhann B. Guðmundsson" <johannbg at hi.is>:
> On 10/05/2009 09:05 PM, Joshua C. wrote:
>> 2009/10/5 Adam Jackson <ajax at redhat.com>:
>>
>>> On Mon, 2009-10-05 at 19:19 +0200, Joshua C. wrote:
>>>
>>>
>>>> (gdb) bt
>>>> #0  0x0000003cc3cd70b3 in __select_nocancel () from /lib64/libc.so.6
>>>> #1  0x00000000004e615a in WaitForSomething (
>>>>     pClientsReady=<value optimized out>) at WaitFor.c:228
>>>> #2  0x0000000000446ef2 in Dispatch () at dispatch.c:386
>>>> #3  0x000000000042d205 in main (argc=<value optimized out>,
>>>>     argv=0x7fffa2ac9218, envp=<value optimized out>) at main.c:397
>>>>
>>> Okay, this isn't the server actually taking 100% of the CPU (almost
>>> certainly), it's before that.  If you type 'cont' to resume, and then ^C
>>> the gdb process once the CPU goes wild, you should break back to the gdb
>>> prompt; _that_'s the backtrace I need.
>>>
>>> Of course, you might not, in which case debugging this gets a bit
>>> harder.
>>>
>>> - ajax
>>>
>>> --
>>> fedora-devel-list mailing list
>>> fedora-devel-list at redhat.com
>>> https://www.redhat.com/mailman/listinfo/fedora-devel-list
>>>
>>>
>> (gdb) handle SIGUSR1 nostop
>> Signal        Stop      Print   Pass to program Description
>> SIGUSR1       No        Yes     Yes             User defined signal 1
>> (gdb) handle SIGUSR2 nostop
>> Signal        Stop      Print   Pass to program Description
>> SIGUSR2       No        Yes     Yes             User defined signal 2
>> (gdb) handle SIGPIPE nostop
>> Signal        Stop      Print   Pass to program Description
>> SIGPIPE       No        Yes     Yes             Broken pipe
>> (gdb) cont
>> Continuing.
>> ^C
>> Program received signal SIGINT, Interrupt.
>> 0x0000003cc3cd6827 in ioctl () from /lib64/libc.so.6
>> (gdb) bt
>> #0  0x0000003cc3cd6827 in ioctl () from /lib64/libc.so.6
>> #1  0x0000003cd6003113 in drmIoctl (fd=8, request=3221775460,
>> arg=0x7fff78cabbc0) at xf86drm.c:187
>> #2  0x0000003cd600335c in drmCommandWriteRead (fd=8,
>> drmCommandIndex=<value optimized out>, data=0x7fff78cabbc0,
>> size=<value optimized out>)
>>     at xf86drm.c:2363
>> #3  0x00007f6c6a6b3f08 in radeon_bufmgr_gem_wait_rendering (buf=<value
>> optimized out>) at radeon_bufmgr_gem.c:282
>> #4  0x00007f6c6a69a51a in RADEONPrepareAccess (pPix=0x243c2d0,
>> index=0) at radeon_exa.c:279
>> #5  0x00007f6c69be43b4 in ExaDoPrepareAccess (pDrawable=0x243c2d0,
>> index=0) at exa.c:523
>> #6  0x00007f6c69be44b8 in exaPrepareAccessReg (pDrawable=0x243c2d0,
>> index=0, pReg=0x0) at exa.c:543
>> #7  0x00007f6c69beceac in ExaCheckComposite (op=<value optimized out>,
>> pSrc=0x24430a0, pMask=0x2397610, pDst=0x27a04b0, xSrc=<value optimized
>> out>,
>>     ySrc=<value optimized out>, xMask=0, yMask=0, xDst=19, yDst=85,
>> width=55, height=18) at exa_unaccel.c:342
>> #8  0x00007f6c69beb564 in exaComposite (op=<value optimized out>,
>> pSrc=0x24430a0, pMask=0x2397610, pDst=0x27a04b0, xSrc=<value optimized
>> out>,
>>     ySrc=<value optimized out>, xMask=0, yMask=0, xDst=19, yDst=85,
>> width=55, height=18) at exa_render.c:967
>> #9  0x000000000052eb90 in damageComposite (op=8 '\b', pSrc=<value
>> optimized out>, pMask=<value optimized out>, pDst=0x27a04b0, xSrc=1,
>> ySrc=0,
>>     xMask=<value optimized out>, yMask=<value optimized out>, xDst=19,
>> yDst=85, width=55, height=<value optimized out>) at damage.c:643
>> #10 0x000000000052720c in ProcRenderComposite (client=0x2625310) at render.c:720
>> #11 0x00000000004471d4 in Dispatch () at dispatch.c:456
>> #12 0x000000000042d205 in main (argc=<value optimized out>,
>> argv=0x7fff78cac198, envp=<value optimized out>) at main.c:397
>>
>>
>
> Which kernel are you using ?
>
> JBG
>
> --
> fedora-devel-list mailing list
> fedora-devel-list at redhat.com
> https://www.redhat.com/mailman/listinfo/fedora-devel-list
>
 I think the following can be useful:

lspci -vvv:
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon
Xpress 200M] (prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] Device 010f
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 66 (2000ns min), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 17
        Region 0: Memory at c8000000 (32-bit, prefetchable)
[size=128M]
        Region 1: I/O ports at 9000 [size=256]
        Region 2: Memory at c0100000 (32-bit, non-prefetchable)
[size=64K]
        [virtual] Expansion ROM at c0120000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: radeon
        Kernel modules: radeon, radeonfb

Installed packages:
kernel-debuginfo-2.6.30.8-64.fc11.x86_64
kernel-debuginfo-common-x86_64-2.6.30.8-64.fc11.x86_64
kernel-2.6.30.8-64.fc11.x86_64

xorg-x11-server-utils-7.4-7.1.fc11.x86_64
xorg-x11-server-common-1.6.4-0.1.fc11.x86_64
xorg-x11-server-Xorg-1.6.4-0.1.fc11.x86_64
xorg-x11-server-debuginfo-1.6.4-0.1.fc11.x86_64

xorg-x11-drv-ati-debuginfo-6.12.2-18.fc11.x86_64
xorg-x11-drv-ati-6.12.2-18.fc11.x86_64

mesa-dri-drivers-7.6-0.2.fc11.x86_64
mesa-libGLU-7.6-0.2.fc11.x86_64
mesa-libGL-7.6-0.2.fc11.x86_64
mesa-debuginfo-7.6-0.1.fc11.x86_64

libdrm-debuginfo-2.4.11-2.fc11.x86_64
libdrm-2.4.11-2.fc11.x86_64

I've also attached my Xorg.0.log.

Usually there are no error messages in dmesg. However once I found
this in there (not sure if it's related):
[drm:drm_buffer_object_validate] *ERROR* Out of aperture space or DRM
memory quota.
[drm:drm_buffer_object_validate] *ERROR* Failed moving buffer.
ffff880142183000 19219 20000a7 10000a7
[drm:drm_buffer_object_validate] *ERROR* Out of aperture space or DRM
memory quota.
[drm:drm_buffer_object_validate] *ERROR* Failed moving buffer.
ffff880142183000 19219 20000a7 10000a7
[drm:drm_buffer_object_validate] *ERROR* Out of aperture space or DRM
memory quota.
[drm:drm_buffer_object_validate] *ERROR* Failed moving buffer.
ffff880142183000 19219 20000a7 10000a7
[drm:drm_buffer_object_validate] *ERROR* Out of aperture space or DRM
memory quota.
[drm:drm_buffer_object_validate] *ERROR* Failed moving buffer.
ffff880142183000 19219 20000a7 10000a7

The same is with the Xorg.0.log - no error messages. But two weeks ago
I saw this (never seen it since then):
(EE) RADEON(0): ADVANCE_RING count != expected (14 vs 16) at
radeon_textured_videofuncs.c:1623
(EE) RADEON(0): ADVANCE_RING count != expected (14 vs 16) at
radeon_textured_videofuncs.c:1623
(EE) RADEON(0): ADVANCE_RING count != expected (14 vs 16) at
radeon_textured_videofuncs.c:1623
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