NM 1.1.93 in xenial silently loses wifi connection (no GUI feedback)

[Steve Langasek]

Twice today, NM 1.1.93 has dropped my wifi connection. I don't know why and haven't looked; the connection is usually stable since the AP is in the room with my laptop, but perhaps there's something up with the kernel I'm currently running.

However, the serious bug that I'm reporting is that when the wifi connection dropped, nothing told me that this had happened. nm-applet's display did not update; there was no automatic reconnect attempt; even the VPN process, which was no longer operational because it had lost its route to the VPN endpoint, was still running (and the lock icon still shown on nm-applet).

Only when I looked at my routing table to see what was going on did the problem become apparent.

Since this has already happened twice today, I can probably get more debugging information "soon" if needed - just ask.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.1.93-0ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
Uname: Linux 4.4.0-18-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 18 15:39:18 2016
InstallationDate: Installed on 2010-09-24 (2033 days ago)
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WWanEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to xenial on 2016-04-15 (3 days ago)
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

[Steve Langasek (vorlon)]

The syslog entries starting at Apr 18 15:31:28 are from my manual disconnection/reconnection through nm-applet.

[Steve (cheeto-crunch)]

Confirmed. This is also happening to me.

[ 4831.459396] show_signal_msg: 54 callbacks suppressed
[ 4831.459461] nm-applet[2185]: segfault at 7f287f4885a4 ip 00007f287f1a2070 sp 00007ffd911bbe60 error 7 in libglib-2.0.so.0.4800.0[7f287f169000+10e000]

[Steve Langasek (vorlon)]

On Sat, Apr 23, 2016 at 06:18:30AM -0000, Steve wrote:
> Confirmed. This is also happening to me.

> [ 4831.459396] show_signal_msg: 54 callbacks suppressed
> [ 4831.459461] nm-applet[2185]: segfault at 7f287f4885a4 ip 00007f287f1a2070 sp 00007ffd911bbe60 error 7 in libglib-2.0.so.0.4800.0[7f287f169000+10e000]

That is not this bug.

[Steve (cheeto-crunch)]

@Steve Langsek

It may not be the same output, however the upgrade from 14.04 to 16.04 is causing me the exact same problem you're experiencing. That is the only error output that I am able to locate when it occurs. The possibility that they are related due to similarity may be pertinent to its resolution.

Thank you.

[Steve Langasek (vorlon)]

On Sat, Apr 23, 2016 at 08:10:21PM -0000, Steve wrote:
> It may not be the same output, however the upgrade from 14.04 to 16.04
> is causing me the exact same problem you're experiencing.

No, it is not. Please file a separate bug for your unrelated issue.

[Aron Xu (happyaron)]

Should be fixed in 1.2.2 SRU.