Date: Mon, 11 Nov 2002 12:23:08 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: "Joel M. Baldwin" <qumqats@outel.org> Cc: current@freebsd.org Subject: RE: Panics instead of Hard Locks Message-ID: <XFMail.20021111122308.jhb@FreeBSD.org> In-Reply-To: <40095464.1036852016@[192.168.1.20]>
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On 09-Nov-2002 Joel M. Baldwin wrote:
>
> Since going from a SMP to nonSMP kernel the Hard Locks don't
> seem to be happening. However I'm getting panics.
>
> I've gotten 4 'sleeping thread owns a mutex' panics and one each
> of 'Assertion i != 0 failed at ../../../kern/subr_witness.c:669'
> and 'Duplicate free of item 0xc3895cc0 from zone 0xc0ea63c0(VMSPACE)'
>
> More info follows. I finally got a debugger kernel built so I'll
> have even more info after the next panic. Let me know what I can
> do to help.
>
> --------------------------------------------------------------
>
>
> panic: Assertion i != 0 failed at ../../../kern/subr_witness.c:669
> Debugger("panic")
> Stopped at Debugger+0x54: xchgl %ebx,in_Debugger.0
> db> bt
> No such command
> db> x
> Debugger+0x54: 29401d87
> db> t
> Debugger(c038693f,c03f6020,c0389a7b,cd2e2b00,1) at Debugger+0x54
> panic(c0389a7b,c0389cee,c038993f,29d,cd2e2b64) at panic+0xab
> witness_lock(c03c29a0,8,c0386f4e,134,c0385a95) at witness_lock+0x513
> _mtx_lock_flags(c03c29a0,0,c0386f4e,134,cd2e2b90) at
> _mtx_lock_flags+0xb1
> msleep(c265d504,c03f4974,44,c039acd9,0) at msleep+0x644
> acquire(c265d504,1000000,600,e3,5) at acquire+0xa7
> lockmgr(c265d504,2,0,c0eadea0,cd2e2c2c) at lockmgr+0x378
> _vm_map_lock_read(c265d4c8,c039ad3c,153,c0385a95,c265c700) at
> _vm_map_lock_read+0x5b
> vmspace_swap_count(c265d4c8,0,c039c4d2,493,0) at vmspace_swap_count+0x29
> vm_pageout_scan(0,0,44,c039c590,1f4) at vm_pageout_scan+0xa48
> vm_pageout(0,cd2e2d48,c0384133,354,0) at vm_pageout+0x262
> fork_exit(c03163b0,0,cd2e2d48) at fork_exit+0xa5
> fork_trampoline() at fork_trampoline+0x1a
> --- trap 0x1, eip = 0, esp = 0xcd2e2d7c, ebp = 0 ---
*sigh*, This is a bogus assertion and my fault. I'll fix it. Thanks!
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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