On Jul 19,  1:26am, wiz@NetBSD.org (Thomas Klausner) wrote:
-- Subject: Re: 3.99.7 system crashed while shutting down

We did not use to turn off swap with swapctl and this may have exposed
bugs. Can you try to either comment this out, or put something before
and after swapctl is invoked?

christos

| On Mon, Jul 11, 2005 at 07:48:20PM +0300, Christos Zoulas wrote:
| > It is dying on this line:
| > 
| > 	dev_t dev = ap->a_vp->v_rdev;
| > 
| > When it de-references ap->a_vp. Is the vnode pointer corrupted? It will
| > be hard to tell without a register dump...
| 
| I had the problem again.  Different backtrace, but with
| a register dump. Hope this helps.
| 
| finger-copied:
| uvm_fault (0xcb5c4e04, 0, 0, 1) -> 0xe
| kernel page fault trap, code = 0
| Stopped in pid 336.1 (mencoder)
| 
| bt:
| uvm_rb_remove
| uvm_unmap_remove
| uvm_pagermapout
| genfs_getpages
| VOP_GETPAGES
| ufs_balloc_rage
| ffs_write
| VOP_WRITE
| vn_write
| dofilewrite
| sys_write
| syscall_plain
| 
| show reg:
| ds 0x10
| es 0x10
| fs 0x30
| gs 0x10
| ed 0
| es 0xc0db7e34
| ebp 0xcb113a40
| ebx 0xc0db7e00
| ecx 0xc0db7e00
| eax 0x150
| eip 0xc0304c8b
| cs 0x8
| eflags 0x10297
| esp 0xcb113a58
| ss 0x10
| netbsd:uvm_rb_remove+0x2f: movl 0x20(%eax),%eax
| 
| The crashdump in /var/crash seems broken:
| # gdb netbsd
| GNU gdb 5.3nb1
| Copyright 2002 Free Software Foundation, Inc.
| GDB is free software, covered by the GNU General Public License, and you are
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| Type "show copying" to see the conditions.
| There is absolutely no warranty for GDB.  Type "show warranty" for details.
| This GDB was configured as "i386--netbsdelf"...(no debugging symbols found)...
| (gdb) target kcore core
| can not access 0xcb857834, invalid translation (invalid PTE)
| can not access 0xcb857834, invalid translation (invalid PTE)
| warning: cannot read switchframe registers
| #0  0x00000008 in ?? ()
| (gdb) bt
| #0  0x00000008 in ?? ()
| can not access 0xcb85787c, invalid translation (invalid PTE)
| can not access 0xcb85787c, invalid translation (invalid PTE)
| Cannot access memory at address 0xcb85787c
| (gdb)  
| 
|  Thomas
-- End of excerpt from Thomas Klausner