Date: Mon, 03 Apr 2006 18:57:51 +0900 From: Ganbold <ganbold@micom.mng.net> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-current@freebsd.org Subject: Re: page fault on today's CURRENT (tcp_usr_accept) Message-ID: <4430F19F.9020602@micom.mng.net> In-Reply-To: <20060403105231.D76562@fledge.watson.org> References: <4430DF4E.1060600@micom.mng.net> <20060403105231.D76562@fledge.watson.org>
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Robert Watson wrote: > > On Mon, 3 Apr 2006, Ganbold wrote: > >> I've got page fault on today's CURRENT. > > After looking at tcp_usr_accept(), I certainly see *a* bug, which > might be the one you've run into. I've committed what I believe is > the fix as tcp_usrreq.c:1.134. Could you pull that down and see if > life gets better? > > Basically, there was erroneous handling of a connection that has been > disconnected while sitting in the accept queue before the application > manages to call accept() on it (indeed, a race). I see, I'll try it tomorrow and let you know if there is anything. thanks, Ganbold > > Robert N M Watson > >> >> 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 >> >> Ganbold >> >> >> > > >
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