Fatal double fault while copy to NFS filesystems

[Kostik Belousov]

On Fri, Jul 06, 2007 at 07:07:00PM +0400, Alex Keda wrote:
> When I copy files to NFS on another host kernel crash:
> Fatal double fault:
> eip = 0xc07e9e29
> esp = 0xe31a3000
> ebp = 0xe31a3000
> cpuid = 1; apic id = 01
> panic: double fault
> cpuid = 1
> =======================
> before this, I see on /var/log/messages
> nve0: device timeout
> =======================
> how repeat problem:
> ussr# df -h
> Filesystem     Size    Used   Avail Capacity  Mounted on
> /dev/ad0s1a     72G    6.1G     60G     9%    /
> devfs          1.0K    1.0K      0B   100%    /dev
> ussr# dd if=/dev/zero of=file_20mb bs=1m count=20
> ussr# mount 192.168.254.254:/shares /mnt/
> ussr# df -h
> Filesystem                 Size    Used   Avail Capacity  Mounted on
> /dev/ad0s1a                 72G    6.1G     60G     9%    /
> devfs                      1.0K    1.0K      0B   100%    /dev
> 192.168.254.254:/shares    271G    179G     89G    67%    /mnt
> ussr# cp file_20mb /mnt/
> then, after 3-5 second I see "device timeout", and later, after 5-7 
> seconds - system crash
> =====================
> another information - this problem appearance after I upgrade remote 
> machine (6.2-RELEASE-p5), I change CPU from Celeron 466 to PIII 800.
> interface on remote machine - 3com509b
> if I slow copy to remote machine (~100kb/s - 10% interface usage) - all 
> good. System not crash...
> if I copy from remote machine - all good - system not crash...
> on logs on remote machine - all clean.
> =====================
> 3 days ago I upgrade my system to 6.2-RELEASE-p5, but - problem exists...

Double fault issue might be the problem that is fixed in CURRENT/RELENG_6.
To confirm this, ddb backtrace after the panic will be helpful. You will
need to compile DDB into the kernel, obtain DDB prompt after the panic
and issue "bt" command.
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