Interestingly I just tried to zsync today's amd64 ubuntu iso yet again and it happened a third time. So maybe I can temporarily reproduce it. This time I also had a kernel dump for chrome-sandbox which I tried to start to add a comment to this bug, before realizing how foolish that was.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1301558 Title: [ath9k_htc] 14.04 NetworkManager hangs after 'ath: phy0: Unable to remove station entry for...' Status in “linux” package in Ubuntu: Incomplete Bug description: This problem has been happening randomly since I installed 14.04. Today it happened twice while trying to zsync the latest iso. I use a TP-Link TL-WN821N wireless adapter to connect to the internet, which uses the ath9k_htc module. NetworkManager occasionally locks up to the point where any commands I try to kill it or restart it hang as well, and my only way out is REISUB. Right before it happens I have noticed twice in my dmesg: [ 494.896048] ath: phy0: Unable to remove station entry for: f4:ec:38:ec:42:02 For reference that mac address is the default router I connect to daily. and then shortly after we get a kernel dump for NetworkManager: [ 720.752078] INFO: task NetworkManager:850 blocked for more than 120 seconds. [ 720.752090] Not tainted 3.13.0-21-generic #43-Ubuntu [ 720.752095] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 720.752100] NetworkManager D ffff88011fd14440 0 850 1 0x00000000 [ 720.752110] ffff8800cd3bd8d0 0000000000000002 ffff8800df0a5fc0 ffff8800cd3bdfd8 [ 720.752119] 0000000000014440 0000000000014440 ffff8800df0a5fc0 ffff8800cedfe8d8 [ 720.752127] ffff8800cedfe8dc ffff8800df0a5fc0 00000000ffffffff ffff8800cedfe8e0 [ 720.752135] Call Trace: [ 720.752150] [<ffffffff81719259>] schedule_preempt_disabled+0x29/0x70 [ 720.752159] [<ffffffff8171b0c5>] __mutex_lock_slowpath+0x135/0x1b0 [ 720.752167] [<ffffffff8171b15f>] mutex_lock+0x1f/0x2f [ 720.752224] [<ffffffffa0355e5d>] nl80211_dump_scan+0x5d/0x630 [cfg80211] [ 720.752233] [<ffffffff8160a4a1>] ? __kmalloc_reserve.isra.25+0x31/0x90 [ 720.752243] [<ffffffff816476fe>] genl_lock_dumpit+0x2e/0x50 [ 720.752249] [<ffffffff81644954>] netlink_dump+0x84/0x240 [ 720.752256] [<ffffffff8164523b>] __netlink_dump_start+0x1ab/0x220 [ 720.752264] [<ffffffff81649166>] genl_family_rcv_msg+0x276/0x370 [ 720.752271] [<ffffffff8160b0be>] ? __alloc_skb+0x4e/0x2b0 [ 720.752278] [<ffffffff816476d0>] ? genl_lock_done+0x50/0x50 [ 720.752284] [<ffffffff81647680>] ? genl_unlock+0x20/0x20 [ 720.752295] [<ffffffff811a2608>] ? __kmalloc_node_track_caller+0x58/0x1e0 [ 720.752302] [<ffffffff81649260>] ? genl_family_rcv_msg+0x370/0x370 [ 720.752309] [<ffffffff816492f1>] genl_rcv_msg+0x91/0xd0 [ 720.752316] [<ffffffff81647379>] netlink_rcv_skb+0xa9/0xc0 [ 720.752322] [<ffffffff81647878>] genl_rcv+0x28/0x40 [ 720.752329] [<ffffffff816469a5>] netlink_unicast+0xd5/0x1b0 [ 720.752336] [<ffffffff81646d7f>] netlink_sendmsg+0x2ff/0x740 [ 720.752343] [<ffffffff81644cb2>] ? netlink_recvmsg+0x1a2/0x3a0 [ 720.752351] [<ffffffff81601f3b>] sock_sendmsg+0x8b/0xc0 [ 720.752359] [<ffffffff81601c2e>] ? move_addr_to_kernel.part.16+0x1e/0x60 [ 720.752366] [<ffffffff816027e1>] ? move_addr_to_kernel+0x21/0x30 [ 720.752373] [<ffffffff816027a9>] ___sys_sendmsg+0x3a9/0x3c0 [ 720.752382] [<ffffffff811cd000>] ? poll_select_copy_remaining+0x130/0x130 [ 720.752390] [<ffffffff811cd000>] ? poll_select_copy_remaining+0x130/0x130 [ 720.752399] [<ffffffff8101b763>] ? native_sched_clock+0x13/0x80 [ 720.752406] [<ffffffff8101b763>] ? native_sched_clock+0x13/0x80 [ 720.752413] [<ffffffff8109d12d>] ? sched_clock_local+0x1d/0x80 [ 720.752423] [<ffffffff811112cc>] ? acct_account_cputime+0x1c/0x20 [ 720.752429] [<ffffffff8109d75b>] ? account_user_time+0x8b/0xa0 [ 720.752437] [<ffffffff81602eb2>] __sys_sendmsg+0x42/0x80 [ 720.752444] [<ffffffff81602f02>] SyS_sendmsg+0x12/0x20 [ 720.752452] [<ffffffff817254ff>] tracesys+0xe1/0xe6 I don't know how to reproduce it, but it has happened at least five times since the install last week. I will attach the dmesg I took before the last REISUB to the bug. Please let me know if any more information is useful, I'll try to get it next time it happens. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-21-generic 3.13.0-21.43 ProcVersionSignature: Ubuntu 3.13.0-21.43-generic 3.13.8 Uname: Linux 3.13.0-21-generic x86_64 ApportVersion: 2.14-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC3: jconti 2024 F.... pulseaudio /dev/snd/controlC0: jconti 2024 F.... pulseaudio /dev/snd/controlC2: jconti 2024 F.... pulseaudio /dev/snd/controlC1: jconti 2024 F.... pulseaudio CurrentDesktop: Unity Date: Wed Apr 2 14:53:42 2014 HibernationDevice: RESUME=UUID=f62b1259-1f84-4a06-9c97-90a5eb41cfd4 InstallationDate: Installed on 2014-03-28 (5 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140328) MachineType: HP Pavilion 061 RC658AA-ABA a1630n ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-21-generic root=UUID=863ed135-24c6-4cf5-b1b8-b4e76181f621 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-21-generic N/A linux-backports-modules-3.13.0-21-generic N/A linux-firmware 1.127 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/02/2006 dmi.bios.vendor: Phoenix Technologies, LTD dmi.bios.version: 3.07 dmi.board.name: NODUSM3 dmi.board.vendor: ASUSTek Computer INC. dmi.board.version: 1.05 dmi.chassis.type: 3 dmi.chassis.version: 1111 dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr3.07:bd08/02/2006:svnHPPavilion061:pnRC658AA-ABAa1630n:pvr0nx1114RE101NODM300:rvnASUSTekComputerINC.:rnNODUSM3:rvr1.05:cvn:ct3:cvr1111: dmi.product.name: RC658AA-ABA a1630n dmi.product.version: 0nx1114RE101NODM300 dmi.sys.vendor: HP Pavilion 061 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301558/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp