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Re: Help with debuging Xserver / Goes in an infinite loop



On 10/05/2009 09:05 PM, Joshua C. wrote:
> 2009/10/5 Adam Jackson <ajax 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 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
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