Date: Mon, 3 Apr 2006 10:07:36 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Ganbold <ganbold@micom.mng.net> Cc: freebsd-current@freebsd.org Subject: Re: page fault on today's CURRENT (tcp_usr_accept) Message-ID: <20060403100516.C76562@fledge.watson.org> In-Reply-To: <4430DF4E.1060600@micom.mng.net> References: <4430DF4E.1060600@micom.mng.net>
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On Mon, 3 Apr 2006, Ganbold wrote: > I've got page fault on today's CURRENT. > > Fatal trap 12: page fault while in kernel mode > fault virtual address = 0xa0 > fault code = supervisor write, page not > present > instructon pointer = 0x20: 0xc062bbde > stack pointer = 0x28: 0xcc8efc10 > frame pointer = 0x28: 0xcc8efc2c > 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 = 435 (smbd) > [thread pid 435 tid 100039] > stopped at tcp_usr_accept+0xd6: cmpxchgl %ecx, 0xa0(%ebx) > > I'm running samba (samba-3.0.21b,1) on this test machine and there is no > load. > > FreeBSD gw.micom.mng.net 7.0-CURRENT FreeBSD 7.0-CURRENT #16: Mon Apr 3 > 14:15:48 ULAST 2006 tsgan@gw.micom.mng.net:/usr/obj/usr/src/sys/GW i386 Is there any chance you can extract a stack trace, as well as file names and line numbers for the trace? If you have a core, could I get you to dump the state from the relevant frames? The above looks like a NULL pointer derefernece in tcp_usr_accept(). Since I've moderately exercised the accept() path on TCP, it's presumably a race condition of some sort. Thanks! Robert N M Watson
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