[Bug 206112] [rtwn] Under heavy load, "can't map mbuf (error 12)" arises

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206112

            Bug ID: 206112
           Summary: [rtwn] Under heavy load, "can't map mbuf (error 12)"
                    arises
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: evil.lombo at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hi,

I'm testing the rtwn module and under heavy usage (e.g. video streaming) or a
high number of active connections (e.g. multiple browser tabs or P2P), the
interface stops responding in a few minutes and the following message spams
multiple times on the system message buffer.

rtwn0: can't map mbuf (error: 12) 

where 12 I assume it's the error number of ENOMEM.

ifconfig wlan0 down and ifconfig wlan0 up does not reset the interface and the
card still not respond. A full reboot of the machine fixes it.

When those messages appear, trying to resume the stream from the application
issues a kernel panic while trying to unload the module results in a machine
freeze.

I'll take the crash dump, if it's necessary.

With light usage, I can't get the issue.

(I don't know if this relates to the performance issue I have with the module.
The speed seems capped to around 1/3 rather than the full 54mbps rate I got
using the ndis wrapper. I'm opening a separate bug report for that.)

Which information are needed?

Thanks,

Simone

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