Date: Wed, 29 May 2002 21:52:32 +0100 From: Ian Dowse <iedowse@maths.tcd.ie> To: Mark Ibell <marki@econz.co.nz> Cc: freebsd-stable@freebsd.org Subject: Re: Daily kernel panics on 4.6-RC system Message-ID: <200205292152.aa04624@salmon.maths.tcd.ie> In-Reply-To: Your message of "Wed, 29 May 2002 14:29:00 %2B1200." <008b01c206b8$981dbcb0$166e10ac@MARKI>
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In message <008b01c206b8$981dbcb0$166e10ac@MARKI>, Mark Ibell writes: >We have had trouble with our Dell PowerEdge 1400 server since day one and it >has now got to the point where it kernel panics once or twice a day. The >1400 currently runs 4.6-RC but we have had a similar problem with >4.3-RELEASE & 4.5-RELEASE, although the problem has definitely got a lot >worse since upgrading to 4.6-RC. Perhaps someone can make sense of the >following crash dump info. >Fatal trap 12: page fault while in kernel mode >fault virtual address = 0x50 >fault code = supervisor read, page not present >#6 0xc024100b in tcp_output (tp=0xde1ef7c0) at >/usr/src/sys/netinet/tcp_output.c:942 This crash "shouldn't happen"; the code is trying to read tp->rcv_nxt in the line if (win > 0 && SEQ_GT(tp->rcv_nxt+win, tp->rcv_adv)) but somehow the non-NULL `tp' argument has become NULL during the execution of the function. In the assembly output here, `tp' is kept in one register throughout the whole tcp_output() function, so it must be getting corrupted by one of the functions called by tcp_output(). Are you using any unusual compiler optimisations in /etc/make.conf? There are known issues with using -O2 or greater that would certainly explain these crashes. It would also be worth trying different hardware to determine if this is a software or hardware issue. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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