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Re: port-amd64/43236: Removing a file while it is accessed through NFS crashes the server
The following reply was made to PR kern/43236; it has been noted by GNATS.
From: Peter Kerwien <peter%kerwien.homeip.net@localhost>
Subject: Re: port-amd64/43236: Removing a file while it is accessed through NFS
crashes the server
Date: Mon, 03 May 2010 21:35:57 +0200
On Mon, 3 May 2010 05:40:03 +0000 (UTC), David Holland
> You can also turn on the built-in debugger by doing
> sysctl -w ddb.onpanic=1
OK, here it comes. This time it was reproduced on a NetBSD-5.0.2
installation without any modifications.
uvm_fault(0xffff80004e9ab2e0, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff803b4172 cs 8 rflags 10246 cr2 c0 cpl 0 rsp
kernel: page fault trap, code=0
Stopped in pid 208.2 (nfsd) at netbsd:ufs_fhtovp+0x42: cmpw $0,0xc0(%rax)
ufs_hvtovp() at netbsd:ufs_hvtovp+0x42
ufs_hvtovp() at netbsd:ufs_hvtovp+0x58
VFS_HVTOVP() at netbsd:VFS_HVTOVP+0x33
nfsrv_hvtovp() at netbsd:nfsrv_hvtovp+0xa8
nfsrv_read() at netbsd:nfsrv_read+0x273
nfssvc_nfsd() at netbsd:nfssvc_nfsd+0x1c5
sys_nfssvc() at netbsd:sys_nfssvc+0x28f
syscall() at netbsd:syscall+0xb6
There might be typos. I took some pictures of the screen when it crashed.
Are there any easier way to dump the information from the kernel debugger?
I hope you can extract some useful information from this. Let me know if
you need more. I seems to easily reproduce this even on my lab-computer.
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