Date: Fri, 14 Jan 2011 14:37:55 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-net@freebsd.org Cc: Przemyslaw Frasunek <przemyslaw@frasunek.com>, Eugene Grosbein <egrosbein@rdtc.ru>, Mike Tancsa <mike@sentex.net> Subject: Re: panic: bufwrite: buffer is not busy??? Message-ID: <201101141437.55421.jhb@freebsd.org> In-Reply-To: <4D309983.70709@rdtc.ru> References: <4D3011DB.9050900@frasunek.com> <4D30458D.30007@sentex.net> <4D309983.70709@rdtc.ru>
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On Friday, January 14, 2011 1:44:19 pm Eugene Grosbein wrote: > On 14.01.2011 18:46, Mike Tancsa wrote: > > >> I'm using mpd 5.5 on three PPPoE routers, each servicing about 300 PPPoE > >> concurrent sessions. Routers are based on Intel SR1630GP hardware platforms and > >> runs FreeBSD 7.3-RELEASE. > >> > >> I'm experiencing stability issues related to Netgraph. None of above routers can > >> survive more than 20-30 days of uptime under typical load. There are different > >> flavors of kernel panics, but all are somehow related to netgraph. Typical > >> backtraces follow > > > > I also have stability issues on RELENG_8. > > > > http://www.freebsd.org/cgi/query-pr.cgi?pr=153497 > > And for one of my servers (8.2-PRERELEASE/amd64 with 4GB RAM) I just cannot obtain crashdump, > it cannot finish to write it. For example, it happened an hour ago: > > Fatal trap 12: page fault while in kernel mode > cpuid = 2; apic id = 04 > fault virtual address = 0x200000040 > fault code = supervisor read data, page not present > instruction pointer = 0x20:0xffffffff803cc979 Assuming your kernel is built with debug symbols (which is the default), one thing you can do to aid in debugging is this: gdb /boot/kernel/kernel (gdb) l *0xffffffff803cc979 Where the 0xfff<blah> bit is the part of the 'instruction pointer' value above after the colon (:) and then send the output of that in your e-mail to the list. This allows us to the source line at which the fault occurred. -- John Baldwin
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