Does system freeze while scanning Wifi APs should not happen?

[e1-531g]

Hello
Since few days I have supported by OpenBSD's drivers Wifi card. CPU is dual core. System:

# sysctl kern.version                                                                                                      
kern.version=OpenBSD 6.0-current (GENERIC.MP) #85: Wed Dec 28 23:42:44 MST 2016
    build@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
# dmesg | grep iwn                                                                                                         
iwn0 at pci3 dev 0 function 0 "Intel Centrino Advanced-N 6200" rev 0x35: msi, MIMO 2T2R, MoW, address <censored>

I have also checked bsd.sp kernel.

When I am scanning for Access Points using command:

ifconfig iwn0 scan

system freezes. I can not move cursor in Xorg. Music playback stops until ifconfig command ends. I have used time command to measure elapsed time and it is usually around 3 seconds.
After Wifi scanning ends everything seems ok.

[jggimi]

Try a newer -current, as there have been recent developments on network lock controls. If the problem is not resolved, submit a bug report to the Project.

[e1-531g]

Thanks for reply.
I tried older kernel

# sysctl kern.version      
kern.version=OpenBSD 6.0-current (GENERIC.MP) #8: Sat Dec  3 22:18:48 MST 2016
    build@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

and system does not freeze during scan. Scan takes similar amount of time (around 3 seconds).
Of course older kernel was only to test and I am going to use kernel from December 28. I will probably update system in week or two and check if it is fixed. I will report if it will not get fixed.

[jggimi]

Your kernel with the problem was dated 28 December. The most recent revisions to net_block() were dated 29 December, the day after your kernel was built.

The most recent amd64 snapshot available, as I write this, is dated 01 January.

[e1-531g]

I have"

$ sysctl kern.version                                                          
kern.version=OpenBSD 6.0-current (GENERIC.MP) #96: Mon Jan  2 14:19:30 MST 2017
    build@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

and Wifi scanning does not freeze my system.

I was not updating immediately, because:
1. It takes time
2. I try to update base system when both recent base & packages rebuild is done.
3. I didn't take that as major problem. It was just minor inconvenience.

Thanks for help.

[jggimi]

A brief test of a newer kernel requires a reboot, but does not require significant time or effort. For example:

1. $ ftp http://<mirror>/pub/OpenBSD/snapshots/amd64/bsd.mp
2. $ ftp http://<mirror>/pub/OpenBSD/snapshots/amd64/SHA256.sig
3. $ signify -C -p /etc/signify/openbsd-61-base.pub -x SHA256.sig bsd.mp
4. # mv bsd.mp /test.kernel
5. # reboot
6. boot> test.kernel