Public bug reported:

Probably freeze during access to folder caused by 
kernel BUG at /build/linux-BvkamA/linux-4.4.0/fs/namei.c:2562!

Also segfault during collecting information with 'ubuntu-bug linux', but not 
sure it is related:
[80059.937844] apport-kde[22602]: segfault at 7fdb0f1d4b00 ip 00007fdb44cd40f5 
sp 00007ffd35400828 error 4 in 
QtCore.cpython-35m-x86_64-linux-gnu.so[7fdb44ae4000+268000]
[80099.437691] Qt bearer threa[23986]: segfault at 7f23b89942e9 ip 
00007f23b3d41ccb sp 00007f239fffce50 error 4 in 
libgcc_s.so.1[7f23b3d33000+16000]
It is looks like separate issue.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-28-generic 4.4.0-28.47
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  vadim      4045 F.... pulseaudio
 /dev/snd/controlC0:  vadim      4045 F.... pulseaudio
Date: Thu Sep 22 13:52:19 2016
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=4ff5857a-eca8-4968-9e7d-16cb2b146f60
InstallationDate: Installed on 2015-04-28 (512 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: ASUS All Series
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-28-generic 
root=UUID=f0d3e2ee-9f79-431c-9d8a-1079d7638279 ro quiet splash vt.handoff=7
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-28-generic N/A
 linux-backports-modules-4.4.0-28-generic  N/A
 linux-firmware                            1.157.3
RfKill:
 
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-04-22 (152 days ago)
dmi.bios.date: 08/12/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1002
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H81M-K
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1002:bd08/12/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH81M-K:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1626517

Title:
  Access to some folders hangs and in dmesg see kernel BUG report

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