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

Linux vshalts_da.vshalts.com 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>] may_delete+0x154/0x170
[276405.098742] RSP: 0018:ffff94a9fd41fdf0  EFLAGS: 00010216
[276405.098757] RAX: ffff94ab9015dc00 RBX: ffff94aa28be2000 RCX: 0000000e00000000
[276405.098775] RDX: 0000000000000000 RSI: ffff94aa28be2000 RDI: ffff94aa06ec3bf8
[276405.098793] RBP: ffff94ab6a7e8520 R08: ffff94ab91a4a800 R09: ffff94aadbc6308b
[276405.098811] R10: ffff94aabf9206f8 R11: 18c23f265c15f699 R12: ffff94aa06ec3bf8
[276405.098830] R13: ffff94a9e0e7a6e0 R14: ffff94a9afe5e800 R15: 0000000000000000
[276405.098848] FS:  00007fa4589ce700(0000) GS:ffff94ab9fa00000(0000) knlGS:0000000000000000
[276405.098868] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[276405.098883] CR2: 0000000000f721c8 CR3: 0000000207fc6000 CR4: 00000000001406f0
[276405.098900] Stack:
[276405.098908]  ffff94aa28be2000 ffff94a9fd41fe90 ffff94aa06ec3bf8 ffff94a9e0e7a6e0
[276405.098932]  ffff94a9afe5e800 ffffffff92c21de3 ffff94aa28be2000 ffff94a9fd41fe90
[276405.098955]  ffff94ab9015dc00 ffff94a9acc05c00 ffff94a9afe5e800 ffff94aa06ec3bf8
[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 ]---