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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Fri, 9 Jul 2004 08:56:55 -0400 (EDT)
To: Robert Watson <rwatson@FreeBSD.org>
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Subject: Re: panic: Assertion td->td_turnstile != NULL failed at
	../../../kern/subr_turnstile.c:478
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Robert Watson writes:
 > panic(c07ccf34,c07d2fd8,c07d2dc0,1de,c089a9c0) at panic+0x11e
 > turnstile_wait(c24ade80,c088f4a0,c22d6b00,c088f4a0,2,c07cf595,20d) at
 > turnstile_wait+0x23a
 > _mtx_lock_sleep(c088f4a0,0,c07d873a,208) at _mtx_lock_sleep+0x103
 > _mtx_lock_flags(c088f4a0,0,c07d873a,208) at _mtx_lock_flags+0x80
 > vn_read(c291c330,e6ff8c88,c2a54400,1,c2ba4840) at vn_read+0x22
 > dofileread(c2ba4840,c291c330,20,ac3e528,3b) at dofileread+0xb0
 > pread(c2ba4840,e6ff8d14,6,a3,202) at pread+0x6d
 > syscall(ac0002f,ac1002f,bf82002f,3b,0) at syscall+0x217
 > Xint0x80_syscall() at Xint0x80_syscall+0x1f
 > --- syscall (198), eip = 0x28472477, esp = 0xbf82a360, ebp = 0xbf82a38c ---

Any chance at all this could be related to the _mtx_assert() in
vrele()  described in "Alpha problems (though maybe not just Alpha...)"

Drew