Nope, was wrong. It is broken in upstream too. My system:

Linux 4.8.0-040800-generic #201610022031 SMP Mon
Oct 3 00:32:57 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Fresh dmesg error:

[276405.098149] ------------[ cut here ]------------
[276405.098172] kernel BUG at /home/kernel/COD/linux/fs/namei.c:2777!
[276405.098188] invalid opcode: 0000 [#1] SMP
[276405.098199] Modules linked in: cpuid ppp_async ppp_generic slhc fuse 
ipt_REJECT nf_reject_ipv4 nf_log_ipv4 xt_recent nf_conntrack_ipv6 
nf_defrag_ipv6 xt_conntrack ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 
nf_log_common xt_LOG xt_limit xt_hashlimit ip6table_filter ip6_tables 
xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp 
pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bridge stp llc 
iptable_filter ip_tables x_tables binfmt_misc dm_crypt dm_mod ecb intel_rapl 
x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek 
snd_hda_codec_generic uvcvideo snd_hda_intel videobuf2_vmalloc videobuf2_memops 
videobuf2_v4l2 snd_hda_codec videobuf2_core snd_usb_audio snd_hda_core videodev
[276405.098426]  snd_usbmidi_lib media snd_hwdep snd_pcm snd_seq_midi 
snd_seq_midi_event snd_rawmidi joydev eeepc_wmi kvm_intel asus_wmi 
sparse_keymap rfkill kvm irqbypass crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel snd_seq snd_seq_device snd_timer aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd intel_cstate intel_rapl_perf snd 
serio_raw mei_me sg lpc_ich mei shpchp soundcore battery evdev tpm_infineon 
ecryptfs parport_pc ppdev lp parport autofs4 ext4 crc16 jbd2 fscrypto mbcache 
hid_generic usbhid hid btrfs xor raid6_pq i915 i2c_algo_bit drm_kms_helper 
syscopyarea crc32c_intel sysfillrect psmouse sysimgblt fb_sys_fops drm ahci 
r8169 libahci mii wmi thermal fan button fjes video
[276405.098660] CPU: 0 PID: 24246 Comm: rm Tainted: G        W  OE   
4.8.0-040800-generic #201610022031
[276405.098684] Hardware name: ASUS All Series/H81M-K, BIOS 1002 08/12/2014
[276405.098701] task: ffff94ab72632a80 task.stack: ffff94a9fd41c000
[276405.098717] RIP: 0010:[<ffffffff92c20db4>]  [<ffffffff92c20db4>] 
[276405.098742] RSP: 0018:ffff94a9fd41fdf0  EFLAGS: 00010216
[276405.098757] RAX: ffff94ab9015dc00 RBX: ffff94aa28be2000 RCX: 
[276405.098775] RDX: 0000000000000000 RSI: ffff94aa28be2000 RDI: 
[276405.098793] RBP: ffff94ab6a7e8520 R08: ffff94ab91a4a800 R09: 
[276405.098811] R10: ffff94aabf9206f8 R11: 18c23f265c15f699 R12: 
[276405.098830] R13: ffff94a9e0e7a6e0 R14: ffff94a9afe5e800 R15: 
[276405.098848] FS:  00007fa4589ce700(0000) GS:ffff94ab9fa00000(0000) 
[276405.098868] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[276405.098883] CR2: 0000000000f721c8 CR3: 0000000207fc6000 CR4: 
[276405.098900] Stack:
[276405.098908]  ffff94aa28be2000 ffff94a9fd41fe90 ffff94aa06ec3bf8 
[276405.098932]  ffff94a9afe5e800 ffffffff92c21de3 ffff94aa28be2000 
[276405.098955]  ffff94ab9015dc00 ffff94a9acc05c00 ffff94a9afe5e800 
[276405.098978] Call Trace:
[276405.098989]  [<ffffffff92c21de3>] ? vfs_unlink+0x23/0x180
[276405.099009]  [<ffffffffc0567f35>] ? ecryptfs_do_unlink+0x65/0x120 [ecryptfs]
[276405.099028]  [<ffffffff92c21ea8>] ? vfs_unlink+0xe8/0x180
[276405.099043]  [<ffffffff92c259fe>] ? do_unlinkat+0x2ae/0x330
[276405.099062]  [<ffffffff931401f6>] ? entry_SYSCALL_64_fastpath+0x1e/0xa8
[276405.099080] Code: 60 00 3d 00 00 20 00 74 12 41 bc ec ff ff ff 5b 44 89 e0 
5d 41 5c 41 5d 41 5e c3 48 3b 5b 18 75 96 41 bc f0 ff ff ff eb a2 0f 0b <0f> 0b 
41 bc fe ff ff ff eb 96 41 bc eb ff ff ff eb 8e 66 2e 0f
[276405.099192] RIP  [<ffffffff92c20db4>] may_delete+0x154/0x170
[276405.099209]  RSP <ffff94a9fd41fdf0>
[276405.105223] ---[ end trace c5fcde2a70cfe731 ]---

** Tags added: kernel-bug-exists-upstream

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Packages, which is subscribed to linux in Ubuntu.

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

Status in linux package in Ubuntu:

Bug description:
  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[7fdb44ae4000+268000]
  [80099.437691] Qt bearer threa[23986]: segfault at 7f23b89942e9 ip 
00007f23b3d41ccb sp 00007f239fffce50 error 4 in[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
   /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
   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.
   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
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (152 days ago) 08/12/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1002
  dmi.board.asset.tag: To be filled by O.E.M. 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:bvnAmericanMegatrendsInc.:bvr1002:bd08/12/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH81M-K:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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