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Date:      Mon, 05 Mar 2007 00:05:32 -0800
From:      Peter Losher <plosher@plosh.net>
To:        freebsd-stable@freebsd.org
Subject:   'panic: bad pte' error on 6.2-RELEASE (amd64)
Message-ID:  <45EBCF4C.9000901@plosh.net>

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We recently updated one of our dual Opteron systems (w/ 4GB RAM) from
5.5 to 6.2 (amd64 wipe and reinstalled) and about once a week, it panics
with the below message:

-=3D-
TPTE at 0xffff8000040028a0  IS ZERO @ VA 800514000
panic: bad pte
cpuid =3D 2
KDB: stack backtrace:
panic() at 0xffffffff803fdd03 =3D panic+0x253
pmap_remove_pages() at 0xffffffff806072a3 =3D pmap_remove_pages+0x283
exec_new_vmspace() at 0xffffffff803e18e6 =3D exec_new_vmspace+0x216
exec_elf64_imgact() at 0xffffffff803cbb73 =3D exec_elf64_imgact+0x273
kern_execve() at 0xffffffff803e2107 =3D kern_execve+0x457
execve() at 0xffffffff803e2bed =3D execve+0x5d
syscall() at 0xffffffff8060d141 =3D syscall+0x4d1
Xfast_syscall() at 0xffffffff805f8128 =3D Xfast_syscall+0xa8
--- syscall (59, FreeBSD ELF64, execve), rip =3D 0x80069838c, rsp =3D
0x7fffffffe7c8, rbp =3D 0x7fffffffecd0 ---
Uptime: 4d16h55m46s
-=3D-

I do have a dump, and can make that available if need be.  Has anyone
encountered this recently and can shed any light on what might be
causing this?

Best Wishes - Peter


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