Issue #2952 has been updated by tuxillo.


If vkernel 4.6 hangs there you have to cherry-pick the commits I mentioned.

Let me know how it works for you.

Antonio Huete

Bug #2952: vkernel crashes during boot

* Author: zhtw
* Status: Feedback
* Priority: Normal
* Assignee: tuxillo
* Category: vkernel
* Target version: 
Can't start vkernel no my 4.6 machine:

a@kl:~$ uname -a
DragonFly 4.6-RELEASE DragonFly v4.6.0.10.g16fba-RELEASE #10: Wed Aug 
17 14:26:31 CEST 2016  
@kl:~$ sudo /var/vkernel/4.6/boot/kernel/kernel -m 2g -r /vhost/dev/root.img -I 
auto:bridge0 -d -p /var/run/vkernel.
Using memory file: /var/vkernel/memimg.000003
KVM mapped at 0x8000000000-0x10000000000
Copyright (c) 2003-2016 The DragonFly Project.
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
DragonFly v4.6.0.20.ged336-RELEASE #16: Wed Sep 21 14:46:27 CEST 2016
real memory = 2147483648 (2097152K bytes)
avail memory = 2027917312 (1980388K bytes)

Fatal trap 12: page fault while in kernel mode
cpuid = 0
fault virtual address   = 0x9
fault code              = supervisor read, page not present
instruction pointer     = 0x2b:0x6ef9b9
stack pointer           = 0x10:0x7fffffffe6f0
frame pointer           = 0x10:0x1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 ()
current thread          = pri 12
 <- SMP: XXX
kernel: type 12 trap, code=0

CPU0 stopping CPUs: 0x0000000000000000
Stopped at      0x6ef9b9:       movq    0x8(%rbp),%rdi

Interestingly, I was able to start the 4.4 vkernel some time ago, but I 
recently recompiled it and it started to crash the same way 4.6 does. I still 
have access to my working 4.4 vkernel, but don't know what to compare to see 
the difference.

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