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Date:      Sat, 13 Dec 2025 15:41:54 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 291616] bhyve: crashes with slirp open networking
Message-ID:  <bug-291616-27103-GjJFn0vVBQ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-291616-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-291616-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291616

Roman Bogorodskiy <novel@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|16.0-CURRENT                |CURRENT

--- Comment #1 from Roman Bogorodskiy <novel@FreeBSD.org> ---
Additional node: commenting out this assert appears to "fix" the issue. At
least the wget loop runs for a few hours without issues.

With iperf run I get the following result:

client$ iperf -c <server> -u -i 1 -P 8 -t 600 -b 100M

server:

[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total
Datagrams
[ 46] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.048 ms 2727/5347621
(0.051%)
[ 46] 0.00-600.02 sec  7 datagrams received out-of-order
[ 47] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.047 ms 2867/5347593
(0.054%)
[ 42] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.048 ms 3005/5349831
(0.056%)
[ 42] 0.00-600.02 sec  4 datagrams received out-of-order
[ 44] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.047 ms 2673/5349876
(0.05%)
[ 44] 0.00-600.02 sec  12 datagrams received out-of-order
[ 45] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.048 ms 2777/5349872
(0.052%)
[ 45] 0.00-600.02 sec  16 datagrams received out-of-order
[ 49] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.048 ms 3017/5347630
(0.056%)
[ 48] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.048 ms 2795/5347580
(0.052%)
[ 48] 0.00-600.02 sec  2 datagrams received out-of-order
[ 43] 0.00-600.02 sec  7.32 GBytes   105 Mbits/sec   0.048 ms 2775/5349856
(0.052%)
[ 43] 0.00-600.02 sec  4 datagrams received out-of-order
[ ID] Interval       Transfer     Bandwidth
[SUM] 0.00-600.02 sec  58.6 GBytes   838 Mbits/sec   22636/42789859 (0.053%)
[SUM] 0.00-600.02 sec  45 datagrams received out-of-order

On server I also see warnings like: WARN: recvmsg MSG_CTRUNC occured.

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