Date: Fri, 27 Oct 2000 08:59:06 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Michael Bacarella <mbac@mmap.nyct.net> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: vm_page_remove() problem.. Message-ID: <20001027085906.X28123@fw.wintelcom.net> In-Reply-To: <20001027111723.A9057@mmap.nyct.net>; from mbac@mmap.nyct.net on Fri, Oct 27, 2000 at 11:17:23AM -0400 References: <20001027111723.A9057@mmap.nyct.net>
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A crashdump would be a lot more helpful. see: http://www.freebsd.org/handbook/kerneldebug.html -Alfred * Michael Bacarella <mbac@mmap.nyct.net> [001027 08:19] wrote: > This keeps happening to one of our multiprocessor servers. About twice > a day. > > panic: vm_page_remove(): page not found in hash > mp_lock = 01000001; cpuid = 1; lapic.id = 01000000 > boot() called on cpu#1 > > syncing disks... 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 > giving up on 67 buffers > Uptime: 21h28m53s > Automatic reboot in 15 seconds - press a key on the console to abort > Rebooting... > cpu_reset called on cpu#1 > cpu_reset: Stopping other CPUs > cpu_reset: Restarting BSP > cpu_reset_proxy: Grabbed mp lock for BSP > cpu_reset_proxy: Stopped CPU 1 > > FreeBSD bsd10.nyct.net 4.1.1-STABLE FreeBSD 4.1.1-STABLE #0: Fri Oct 20 15:58:40 EDT 2000 myj@bsd6.nyct.net:/usr/obj/usr/src/sys/NYCT i386 > > We've tweaked some variables in response to this (maxusers?) but it > doesn't seem to do the trick. > > It happens most when I do something memory intensive (like stopping and > restarting apache, and all several-hundred children), but it really does > happen quite randomly. > > My wild uneducated guess is that both processors are calling vm_page_remove() > on a page and the one that doesn't happen first ends up panic'ing because > it can't find the page anymore. > > We're in the process of trying it with a non-SMP kernel, but I figure I'd > put this out early in any case as it's obviously a bug of some kind. If > I really find myself at the end of a rope, I'm going to look to see if it's > a hardware problem. > > Thanks > > -- > Michael Bacarella <mbac@mmap.nyct.net> ;finger address for public key > GPG Key Fingerprint: B4E4 82F5 BCAC AB83 E6F7 B5AA 933E 2A75 79A4 A9C1 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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