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Port amd64 - kernel crashing

Sources are updated as of 2008-11-15 12:56:51 UTC...

I was in the middle of running a "pkg_rolling-replace -n" when the panic happened. I've got about 235 packages installed on this system, and my $PKGSRC is located on a _remote_ NFS-mounted filesystem. After reboot, I ran the same command again. pkg_rolling_replace gets lots of weird errors (such as reporting missing operators in and then it panics again. I've repeated this three times, and it panics every time, although at different points in the pkg_rolling-replace process.

I'm suspecting this might be yet another NFS issue, but I have no clue for debugging it further.

Console output transcribed manually, as I have no serial console.

panic: pmap_removes_ptes: unmanaged page marked PG_VLIST, va=0x7f7ffd996000, 
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff8015ba55 cs 8 rflags 246 cr2 7f7ffd62c36e cpl 0 
rsp ffff80004edf98e0
Stopped in pid 18966.1 (make) at netbsd:breakpoint+0x5: leave
uvm_fault(0xffffffff8062bdc0, 0xffff80004cd15000, 1) -> e
fatal page failt in supervisor mode
trap type 6 code 0 rip ffffffff80399fa5 cs 8 rflags 10297 cr2 ffff80004cd1552c 
cpl 8 rsp ffff80004edf92c0
Faulted in DDB; continuing...
breakpoint() at netbsd: breakpoint+0x5
panic() at netbsd:panic+0x260
pmap_do_remove() at netbsd:pmap_do_remove+0x561
uvm_unmap_remove() at netbsd:uvm_unmap_remove+0x217
uvm_space_free() at netbsd:uvm_space_free+0x10b
exit1() at netbsd:exit1+0x1b1
sys_exit() at netbsd:sys_exit+0x53
syscall() at netbsd:syscall+0xb6

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