Re: install/50554: panic on install with qemu 2.4.0 (amd64 install)

[christos%zoulas.com@localhost (Christos Zoulas)]

The following reply was made to PR install/50554; it has been noted by GNATS.

From: christos%zoulas.com@localhost (Christos Zoulas)
To: gnats-bugs%NetBSD.org@localhost, install-manager%netbsd.org@localhost, 
	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Cc: 
Subject: Re: install/50554: panic on install with qemu 2.4.0  (amd64 install)
Date: Mon, 14 Dec 2015 21:35:07 -0500

 On Dec 15,  1:40am, jpb%jimby.name@localhost (jpb%jimby.name@localhost) wrote:
 -- Subject: install/50554: panic on install with qemu 2.4.0  (amd64 install)
 
 | qemu-img command line:
 |  
 | qemu-img create -f raw -o size=15G,preallocation=full  nbsd_QA_hda.img
 | -------------
 |  
 |  
 | QEMU command line  (run under sudo)
 |  
 | #!/bin/sh
 | /usr/local/bin/qemu-system-x86_64 -monitor none \
 |   -cpu Broadwell \
 |   -vga cirrus \
 |   -m 4096      \
 |   -localtime \
 |   -cdrom /usr/home/jpb/ISO/NBSD/7.0/NetBSD-7.0-amd64.iso \
 |   -boot order=cd,menu=on \
 |   -drive if=none,id=drive0,cache=none,aio=native,format=raw,file=/usr/home/jpb/VM.OFF/nbsd_QA_hda.img \
 |   -device virtio-blk,drive=drive0  \
 |   -net nic,vlan=0,macaddr=00:d4:3b:55:00:32 \
 |   -net tap,script=no,ifname=tap8,downscript=no -name "nbsd_QA"
 |  
 | ----------
 |  
 | hardware is a Lenovo T530 with 16G ram
 | >How-To-Repeat:
 | 
 | install from .iso as shown above
 | >Fix:
 | A workaround was noted on #netbsd - use less memory.  Apprently the panic happens on a buffer copy.
 | 
 | By changing my qemu memory parameter to 
 | 
 |   -m 1024
 
 Yes, this has to do with bounce buffer handling which is broken in -7.
 It is supposed to be fixed with this pullup:
 
 https://releng.netbsd.org/cgi-bin/req-7.cgi?show=1011
 
 What does: "ident /netbsd | grep bus_dma" say? Do you have the updated
 version?
 
 christos