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Date:      Wed, 11 Dec 2002 05:12:41 +0900 (JST)
From:      Mitsuru IWASAKI <iwasaki@jp.FreeBSD.org>
To:        des@ofug.org
Cc:        current@FreeBSD.ORG
Subject:   Re: panic in ithread_loop()
Message-ID:  <20021211.051241.00452135.iwasaki@jp.FreeBSD.org>
In-Reply-To: <xzpsmx81so6.fsf@flood.ping.uio.no>
References:  <xzpsmx81so6.fsf@flood.ping.uio.no>

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> This is 100% reproducible with a top-of-tree kernel, but didn't happen
> with Wednesday's sources:
> 
> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0xc01e8d
> fault code              = supervisor write, page not present
> instruction pointer     = 0x8:0xc045dc80
> stack pointer           = 0x10:0xd536dce4
> frame pointer           = 0x10:0xd536dd00
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 12 (swi6: tty:sio clock)
> kernel: type 12 trap, code=0
> Stopped at      0xc045dc80:     movb    %al,0xc01e8d

I saw this panics many times recently.  After totally fresh
buildworld and buildkernel (i.e. rm -rf /usr/obj/* and w/o -DNOCLEAN),
problem was gone.

Please note that recently we had gcc changes.

I've noticed -freg-struct-return brakages, some important ports which
using ndbm library (such as qpopper) is broken right now...

Thanks

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