Date: Sun, 16 Nov 2003 11:53:42 -0800 From: Marcel Moolenaar <marcel@xcllnt.net> To: Daniel Eischen <eischen@vigrid.com> Cc: davidxu@freebsd.org Subject: Re: KSE/ia64 broken Message-ID: <20031116195342.GA60773@dhcp01.pn.xcllnt.net> In-Reply-To: <Pine.GSO.4.10.10311161414290.29933-100000@pcnet5.pcnet.com> References: <20031116182219.GB60377@dhcp01.pn.xcllnt.net> <Pine.GSO.4.10.10311161414290.29933-100000@pcnet5.pcnet.com>
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On Sun, Nov 16, 2003 at 02:30:20PM -0500, Daniel Eischen wrote: > On Sun, 16 Nov 2003, Marcel Moolenaar wrote: > > > On Sun, Nov 16, 2003 at 12:18:33PM -0500, Daniel Eischen wrote: > > > > > > Are you sure there's not an ia64 kernel bug or ia64 context > > > restoring bug? > > > > There's nothing pointing in that direction yet. I keep thinking > > that the case is related to having TP per thread on ia64, while > > it's per KSE on i386. > > If you noop the spinlock/spinunlock, the problem still > occurs. Hmmm, good to know. It tells me that the lock is in reality already a no-op :-) > What should I be looking at, [um]c_flags? mc_flags is very informative. > $ simple > Found completed thread 6000000000014000, uc_flags 0x0, mc_flags 0x8, name initial thread This is a context created by the kernel. It's one created by getcontext(). Only the kernel needs to preserve the return registers (which is what mc_flags indicates) because it needs to be able to resume system calls. > Switching out thread 6000000000014000, state 0 > Threads in waiting queue: > Found completed thread 6000000000014000, uc_flags 0x0, mc_flags 0x3, name initial thread This is an asynchronuous context. Probably the result of a trap, but possibly the result of an interrupt. Does this mean that the thread has run since it was last found (i.e. the previous context) or do we have a case where a context is clobbered (I don't see a switch in)? -- Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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