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Date:      Sat, 7 Jan 2006 00:58:31 -0500
From:      Anish Mistry <mistry.7@osu.edu>
To:        freebsd-stable@freebsd.org
Subject:   panic: vm_object_backing_scan: object mismatch
Message-ID:  <200601070058.44347.mistry.7@osu.edu>

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I just upgraded to RELENG_6 from 6.0 and after running for about a day=20
I got the following panic:
Jan  6 21:37:47 bigguy kernel: pid 30546 (gaim), uid 1001 inumber=20
10313 on /var:
 filesystem full
panic: vm_object_backing_scan: object mismatch
KDB: enter: panic
[thread pid 22780 tid 100175 ]
Stopped at      kdb_enter+0x32: leave
db> bt
Tracing pid 22780 tid 100175 td 0xc8119300
kdb_enter(c06a50b0,c06f9460,c06b9bcd,e9a30978,c8119300) at=20
kdb_enter+0x32
panic(c06b9bcd,0,c06b99b4,604,0) at panic+0x14c
vm_object_backing_scan(c7d7dad4,0,c06b99b4,63b,0) at=20
vm_object_backing_scan+0x4e
c
vm_object_collapse(c9923630,0,c06b99b4,214,c7d7dad4) at=20
vm_object_collapse+0x1b4

vm_object_deallocate(c7d7dad4,0,c06b906f,89e,0) at=20
vm_object_deallocate+0x351
vm_map_delete(c7d16e10,0,bfc00000,c7d16e10,0) at vm_map_delete+0x29d
vm_map_remove(c7d16e10,0,bfc00000,c8119300,e9a30a9c) at=20
vm_map_remove+0x55
exec_new_vmspace(e9a30bf0,c06eeec0,2ec,0,0) at exec_new_vmspace+0x243
exec_elf32_imgact(e9a30bf0,0,c06a2586,149,43) at=20
exec_elf32_imgact+0x1bd
kern_execve(c8119300,e9a30ca8,0,807b94c,807a000) at kern_execve+0x417
execve(c8119300,e9a30d04,c,41d,3) at execve+0x67
syscall(3b,3b,3b,1,0) at syscall+0x13d
Xint0x80_syscall() at Xint0x80_syscall+0x1f
=2D-- syscall (59, FreeBSD ELF32, execve), eip =3D 0x805571f, esp =3D=20
0xbfbfd9bc, ebp
=3D 0xbfbfd9d8 ---

The trace with ps output is here:
http://am-productions.biz/docs/bigguy-vm-panic.txt


=2D-=20
Anish Mistry

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