From owner-freebsd-threads@FreeBSD.ORG  Wed Jun 25 05:08:13 2003
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Date: Wed, 25 Jun 2003 15:15:28 +0300
From: Alexey Zelkin <phantom@FreeBSD.org.ua>
To: threads@freebsd.org
Message-ID: <20030625151528.A13514@phantom.cris.net>
References: <20030625141446.A13215@phantom.cris.net>
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	from phantom@FreeBSD.org.ua on Wed, Jun 25, 2003 at 02:14:46PM +0300
X-Operating-System: FreeBSD 4.7-STABLE i386
Subject: more details (was: Re: libthr & jdk14: cv problems ?)
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hi,

More details on libthr issue:

First, there's no schema in lockups, i.e. while doing few clean rebuilds
of jdk14 tree I have expirienced lockups in random places.

Second, after I switched to debug version of java compiler (with lots of
additional asserts and checks) I have hit into assert "suspend thread
failed".  Unfortunatelly I was unable to find exact place where this
assert is trigerred because of 'third detail' (below).  Quick source
analyzis shown that most _probably_ this assert was trigerred because
of pthread_resume_np() or pthread_cond_wait() functions returned
non-successful value.

Third, it is not possible to run application in gdb while libthr is default
threading library.  gdb always fails with:

: Program received signal ?, Unknown signal.
: 0x2811ca64 in _ctx_start () from /usr/lib/libc.so.5
: (gdb) bt
: #0  0x2811ca64 in _ctx_start () from /usr/lib/libc.so.5
: #1  0x28077150 in _thread_start ()
:     at /home/phantom/src5/lib/libthr/thread/thr_create.c:213
: (gdb) bt full
: #0  0x2811ca64 in _ctx_start () from /usr/lib/libc.so.5
: No symbol table info available.
: #1  0x28077150 in _thread_start ()
:     at /home/phantom/src5/lib/libthr/thread/thr_create.c:213
:         next_uniqueid = 3
:         _thread_next_offset = 56
:         _thread_uniqueid_offset = 8
:         _thread_state_offset = 836
:         _thread_name_offset = 4
:         _thread_ctx_offset = 128
:         _thread_PS_RUNNING_value = 0
:         _thread_PS_DEAD_value = 6
: (gdb)