My main machine suddenly hung last night and then rebooted. There was no big load on it at that time. dmesg contains:
uvm_fault(0xffffffff810157c0, 0xffff8003393c8000, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff80264fc5 cs 8 rflags 10202 cr2 ffff8003393c8000 ilevel 4 rsp fffffe813d81d720 curlwp 0xfffffe813dc10aa0 pid 0.143 lowest kstack 0xfffffe813d81a2c0 panic: trap cpu7: Begin traceback... vpanic() at netbsd:vpanic+0x13c snprintf() at netbsd:snprintf startlwp() at netbsd:startlwp cpu7: End traceback... dumping to dev 168,3 (offset=8, size=8373576): dump Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, (new kernel booting messages follow) I did get a core dump, and I do have a kernel with symbols. # gdb netbsd GNU gdb (GDB) 7.7.1 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64--netbsd". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from netbsd...done. (gdb) target kvm netbsd.core 0xffffffff805b6ac5 in cpu_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at /archive/foreign/src/sys/arch/amd64/amd64/machdep.c:671 671 dumpsys(); (gdb) bt #0 0xffffffff805b6ac5 in cpu_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at /archive/foreign/src/sys/arch/amd64/amd64/machdep.c:671 #1 0xffffffff807b0ae4 in vpanic (fmt=fmt@entry=0xffffffff80c51a95 "trap", ap=ap@entry=0xfffffe813d81d510) at /archive/foreign/src/sys/kern/subr_prf.c:340 #2 0xffffffff807b0b9f in panic (fmt=fmt@entry=0xffffffff80c51a95 "trap") at /archive/foreign/src/sys/kern/subr_prf.c:256 #3 0xffffffff807fc037 in trap (frame=0xfffffe813d81d630) at /archive/foreign/src/sys/arch/amd64/amd64/trap.c:298 #4 0xffffffff8010108e in alltraps () #5 0xffffffff80264fc5 in .Mmbuf_inner_loop () #6 0xfffffe8692e23400 in ?? () #7 0xfffffe813d81d750 in ?? () #8 0xffffffff804c3b5e in in_delayed_cksum (m=0xffff8003393c8000) at /archive/foreign/src/sys/netinet/ip_output.c:791 Backtrace stopped: previous frame inner to this frame (corrupt stack?) This does not really look like useful information, does it? Thomas