Public bug reported:
When using Gnome-Shell on Ubuntu 16.04, the Internet connection will
suddenly drop off, even though the network connection icon will still
indicate a connection.
Attempting to run `sudo service network-manager restart` will hang
indefinitely.
Attempting to restart Gnome-Shell via alt+F2+r, will cause Gnome-Shell
to hang indefinitely.
Switching to a terminal, I inspecting `dmesg` and found several messages
like:
[178443.199324] INFO: task wpa_supplicant:1708 blocked for more than 120
seconds.
[178443.199332] Tainted: G OE 4.4.0-78-generic #99-Ubuntu
[178443.199335] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[178443.199337] wpa_supplicant D ffff88085849ba38 0 1708 1
0x00000000
[178443.199345] ffff88085849ba38 ffff88087f516e30 ffff88001cd2da00
ffff880853c35a00
[178443.199350] ffff88085849c000 ffffffff81ef8184 ffff880853c35a00
00000000ffffffff
[178443.199354] ffffffff81ef8188 ffff88085849ba50 ffffffff8183c8f5
ffffffff81ef8180
[178443.199358] Call Trace:
[178443.199369] [<ffffffff8183c8f5>] schedule+0x35/0x80
[178443.199374] [<ffffffff8183cb9e>] schedule_preempt_disabled+0xe/0x10
[178443.199378] [<ffffffff8183e7d9>] __mutex_lock_slowpath+0xb9/0x130
[178443.199386] [<ffffffff8183e86f>] mutex_lock+0x1f/0x30
[178443.199393] [<ffffffff817453e5>] rtnl_lock+0x15/0x20
[178443.199422] [<ffffffffc07168eb>] nl80211_pre_doit+0xeb/0x180 [cfg80211]
[178443.199429] [<ffffffff81769f8d>] genl_family_rcv_msg+0x1ad/0x3e0
[178443.199435] [<ffffffff810c3b92>] ? __wake_up_common+0x52/0x90
[178443.199441] [<ffffffff8176a1c0>] ? genl_family_rcv_msg+0x3e0/0x3e0
[178443.199446] [<ffffffff8176a236>] genl_rcv_msg+0x76/0xb0
[178443.199450] [<ffffffff81769734>] netlink_rcv_skb+0xa4/0xc0
[178443.199455] [<ffffffff81769dc8>] genl_rcv+0x28/0x40
[178443.199459] [<ffffffff8176910a>] netlink_unicast+0x18a/0x240
[178443.199464] [<ffffffff817694bb>] netlink_sendmsg+0x2fb/0x3a0
[178443.199470] [<ffffffff8139f671>] ? aa_sock_msg_perm+0x61/0x150
[178443.199477] [<ffffffff81718ae8>] sock_sendmsg+0x38/0x50
[178443.199480] [<ffffffff81719591>] ___sys_sendmsg+0x281/0x290
[178443.199487] [<ffffffff8103ad61>] ? __fpu__restore_sig+0xa1/0x480
[178443.199491] [<ffffffff81719ee1>] __sys_sendmsg+0x51/0x90
[178443.199496] [<ffffffff81719f32>] SyS_sendmsg+0x12/0x20
[178443.199501] [<ffffffff81840a32>] entry_SYSCALL_64_fastpath+0x16/0x71
I see similar errors for other programs other than wpa_supplicant, so it
might not be isolated to it, but I'm not sure where else to submit this
error to.
All other `sudo` commands hung, even after 15 minutes of waiting,
leaving me no choice but to reboot. However, this has happened several
times after a recent update, and the symptoms always manifest exactly
the same. No Internet, then Gnome-Shell hangs, then all sudo commands
hang.
I managed to copy my dmesg log before the reboot, which I have attached.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: wpasupplicant 2.4-0ubuntu6
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
Uname: Linux 4.4.0-78-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue May 30 14:56:58 2017
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-xenial-amd64-20160624-2
InstallationDate: Installed on 2017-03-09 (81 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary
20160624-10:47
SourcePackage: wpa
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: wpa (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
** Attachment added: "dmesg log just after system begun to hang"
https://bugs.launchpad.net/bugs/1694517/+attachment/4886316/+files/dmesg.txt
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https://bugs.launchpad.net/bugs/1694517
Title:
Kernel crashes, task wpa_supplicant blocked for more than 120 seconds
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