[omniORB] Servant do nothing, but get about 100% CPU

[Sergey Kholodilov]

Michael,

thank you for answer, your version looks very probably. It's unbelivable,
but right tonight our system administrators upgraded servers to FreeBSD 7.2
:)  I will watch servants work, may be problem will gone.

-- 
Sergey

On Mon, Sep 14, 2009 at 6:27 PM, Michael <omniorb at bindone.de> wrote:

> Hello Sergey,
>
> most probably this is related to a bug in FreeBSD 7.0 which was fixed in
> 7.1 and 7.2, so please upgrade (it is an exception related multi
> threading race condition - something goes wrong when unwinding the
> stack). You can trigger this easily (I have some example code around
> here, but basically just throwing an exception in some parallel remote
> upcalls is enough).
>
> Ever since we upgraded these problems disappeared (forgot which kernel
> file has been patched for this though), but this problem was exclusive
> to 7.0 (neither 6.x nor 7.1ff are affected)
>
> cheers
> Michael
>
> Sergey Kholodilov wrote:
> > Hello,
> >
> > No clients, no connections, servant just waiting and do nothing. But
> > sometimes, may be after some days or weeks it starts eating a lot of CPU.
> >
> > FreeBSD 7.0-STABLE
> > omniORB 4.1.3 (it beter than 4.1.2. 4.1.2 have this problem too, and in
> > 4.1.2 it happens more frequently)
> > gcc 4.2.1
> > Amd64 (I hope, it is not matter, but may be...)
> >
> > ktrace looks like:
> >
> >  94319 WMCDispatch CALL
>  _umtx_op(0xb125a0,0x8,0x1,0xb12580,0x7fffff9fdd90)
> >  94319 WMCDispatch CSW   stop kernel
> >  94319 WMCDispatch CSW   resume kernel
> >  94319 WMCDispatch RET   _umtx_op -1 errno 60 Operation timed out
> >  94319 WMCDispatch CALL  clock_gettime(0,0x7fffff9fddf0)
> >  94319 WMCDispatch RET   clock_gettime 0
> >  94319 WMCDispatch CALL  clock_gettime(0,0x7fffff9fdda0)
> >  94319 WMCDispatch RET   clock_gettime 0
> >  94319 WMCDispatch CALL
>  _umtx_op(0xb125a0,0x8,0x1,0xb12580,0x7fffff9fdd90)
> >  94319 WMCDispatch CSW   stop kernel
> >  94319 WMCDispatch CSW   resume kernel
> >  94319 WMCDispatch RET   _umtx_op -1 errno 60 Operation timed out
> >  94319 WMCDispatch CALL  clock_gettime(0,0x7fffff9fddf0)
> >  94319 WMCDispatch RET   clock_gettime 0
> >  94319 WMCDispatch CALL  clock_gettime(0,0x7fffff9fdda0)
> >  94319 WMCDispatch RET   clock_gettime 0
> >  94319 WMCDispatch CALL
>  _umtx_op(0xb125a0,0x8,0x1,0xb12580,0x7fffff9fdd90)
> > ....
> >
> > There are no FreeBSD port for omniORB 4.1.4, so I don't try new version
> yet.
> >
> >
> >
> > ------------------------------------------------------------------------
> >
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>
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