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Date: Tue, 17 May 2005 15:41:42 -0700
From: Kris Kennaway <kris@obsecurity.org>
To: othermark <atkin901@yahoo.com>
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cc: freebsd-current@freebsd.org
Subject: Re: SMP hard lock with libpthread (thread X holds Y but isn't
	blocked on a lock)
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On Tue, May 17, 2005 at 08:26:11AM -0700, othermark wrote:
> Kris Kennaway wrote:
>=20
> > On Mon, May 16, 2005 at 08:33:14AM -0700, othermark wrote:
> >> I have an application that uses shared memory/threads and is linked wi=
th
> >> libpthread, running on May 10 -current.  Every time I run it, after a =
few
> >> minutes *poof* hard lock on a SMP box.  All debug options are enabled =
in
> >> the kernel, but it won't break to debugger.  Here's what appears on the
> >> console, and addr2line output follows:
> >=20
> > Try the NMI debugger patches, which might be sufficient to get it into
> > DDB.
> >=20
> > Kris
>=20
> Jonathan's report on this issue, does have the stack trace, but seems to
> be triggered by nfs.
>=20
> http://article.gmane.org/gmane.os.freebsd.current/69268

The 'turnstile' panic may be secondary, and the real panic was in some
other thread.  That's why you'd need to get into DDB.

> However, simply recompiling my application with libthr instead of libpthr=
ead
> completely avoids the panic.

Obviously not a real solution..

Kris

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