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List:       freebsd-hackers
Subject:    double fault panic while using gdb amd64 (remote debugging)
From:       vasanth raonaik <vasanth.raonaik () gmail ! com>
Date:       2011-05-27 23:16:49
Message-ID: BANLkTimi_qKQOdjh_WrQ-yQ3ZpJ9QTfnTQ () mail ! gmail ! com
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Hello hackers,

I see a "double fault" error on the console while remote debugging a freebsd
kernel 6.1 on amd64 the moment I press continue on a break point.

I googled and found similar query but couldn't find a solution to this
issue. Is this a known issue? Has there been any fix made for this issue in
the latest freebsd?

here is the email that I found while searching.

http://forum.nginx.org/read.php?23,183241

=================

Hi,

I have looked at archives but with no output.

I am running freebsd7.2 amd64 as a virtual machine(VM) in vmware ESX
server. I have configured remote gdb to debug the kernel modules. My
problem is that whenever the breakpoint is hit and the I issue next or
step kernel panics with "double fault" error. This configuration was
working for 32-bit machine very well. I am trying to debug the tmpfs
module.

Panic message on console is:

Fatal double fault

rip = 0xffffffff80552be1

rsp = 0xffffffff006f5000

rbp = 0xffffffff006f5000

cpuid = 0; apic id = 00

panic: double fault

cpuid = 0

Uptime: 1h16m8s

Physical memory: 4555 MB

Dumping 207 MB: 192 176 160 144 128 112 96 80 64 48 32 16

Dump complete


I tried searching this problem on google also but with no help.

Any help will be appreciated.

Thanks,

Mayank
=================
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