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Date:      Mon, 01 Feb 2021 22:10:06 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 253172] Intel e1000 - Interface Stalls After Media Type is Changed
Message-ID:  <bug-253172-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253172

            Bug ID: 253172
           Summary: Intel e1000 - Interface Stalls After Media Type is
                    Changed
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jcaplan@blackberry.com

# Overview

The e1000 interface stalls occasionally after the media type is changed. The
only way of recovering it is to flap the interface (ifconfig down then up).

# Steps to Reproduce

1. Bring up an e1000 interface on a QNX target.

2. Run a continuous ping to the target e1000 interface from a directly
connected neighbor.

3. Change the media type "ifconfig em0 media 100baseTX mediaopt full-duplex".

4. Sometimes you need to change the media type more than once e.g. "ifconfig
em0 media 1000baseT mediaopt full-duplex"

# Actual Results

Ping stops reaching target.

64 bytes from 10.242.241.213: icmp_seq=1 ttl=64 time=0.707 ms
64 bytes from 10.242.241.213: icmp_seq=2 ttl=64 time=0.721 ms
64 bytes from 10.242.241.213: icmp_seq=3 ttl=64 time=0.649 ms
64 bytes from 10.242.241.213: icmp_seq=4 ttl=64 time=0.768 ms
64 bytes from 10.242.241.213: icmp_seq=1 ttl=64 time=8268 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=3 ttl=64 time=6219 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=9 ttl=64 time=76.1 ms
64 bytes from 10.242.241.213: icmp_seq=10 ttl=64 time=0.541 ms
64 bytes from 10.242.241.213: icmp_seq=11 ttl=64 time=0.604 ms
64 bytes from 10.242.241.213: icmp_seq=12 ttl=64 time=0.754 ms
64 bytes from 10.242.241.213: icmp_seq=13 ttl=64 time=1.02 ms
64 bytes from 10.242.241.213: icmp_seq=14 ttl=64 time=0.676 ms
64 bytes from 10.242.241.213: icmp_seq=15 ttl=64 time=0.609 ms
64 bytes from 10.242.241.213: icmp_seq=16 ttl=64 time=0.591 ms
64 bytes from 10.242.241.213: icmp_seq=1 ttl=64 time=20397 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=3 ttl=64 time=18349 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=10 ttl=64 time=11204 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=12 ttl=64 time=9165 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=13 ttl=64 time=8141 ms (DUP!)
64 bytes from 10.242.241.213: icmp_seq=16 ttl=64 time=5101 ms (DUP!)
>From 10.242.241.212 icmp_seq=50 Destination Host Unreachable
>From 10.242.241.212 icmp_seq=51 Destination Host Unreachable
>From 10.242.241.212 icmp_seq=52 Destination Host Unreachable
>From 10.242.241.212 icmp_seq=53 Destination Host Unreachable
>From 10.242.241.212 icmp_seq=54 Destination Host Unreachable


# Expected Results

Ping continues to reach target (possibly some packets dropped). For instance,
in the above log, the first 2 DUPs happen when the interface media is changed
but service resumes, then I changed it a second time and there are a lot more
DUPs and never starts working again.


# Build Date
FreeBSD bsd-vbox 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r368820: Tue Jan  5
17:30:19 EST 2021    
jcaplan@bsd-vbox:/usr/obj/usr/src-head/amd64.amd64/sys/GENERIC  amd64

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