On Sun, 31 May 2009, Randy Bush wrote: > and one more, this from serial console > > Fatal trap 12: page fault while in kernel mode > cpuid = 0; apic id = 00 > fault virtual address = 0x0 > fault code = supervisor write data, page not present > instruction pointer = 0x20:0xffffffff8047c1da > stack pointer = 0x28:0xffffff807a156630 > frame pointer = 0x28:0xffffff807a1566f0 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 1385 (nfcapd) > trap number = 12 > panic: page fault > cpuid = 0 > > due to when it happens, about 01:50 when there are no cron jobs or anything > obvious, i am suspecting this is not the same as kern/134011 > > it did not leave a dump. and i could not force one as it required a power > cycle to get the box's attention. > > nfcapd is a flow data capture from a couple of lighly loaded (10-20Mbps) > routers. Is it possible to use options KDB_TRACE and KDB_PANIC to dump a stack trace to the serial console to use as a starting point for debugging? And/or DDB scripting to run various debugging commands which log to serial console or a textdump? Robert N M Watson Computer Laboratory University of CambridgeReceived on Sun May 31 2009 - 15:09:23 UTC
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