Yes, it still exists. To confirm the kernel version:

$ uname -a
Linux oil-boldore 4.15.0-041500rc7-generic #201801072330 SMP Sun Jan 7 23:31:29 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

The system hung bringing CPU 11 back online, with the following dmesg output:

[  101.179624] smpboot: Booting Node 1 Processor 11 APIC 0x16
[  101.727507] general protection fault: 0000 [#1] SMP PTI
[  101.727812] Modules linked in: nls_iso8859_1 intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm joydev input_leds irqbypass ipmi_ssif intel_cstate intel_rapl_perf ipmi_si acpi_power_meter mei_me shpchp ipmi_devintf ipmi_msghandler mei lpc_ich mac_hid acpi_pad ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul mgag200 crc32_pclmul ttm ghash_clmulni_intel pcbc usbhid ses igb drm_kms_helper enclosure dca syscopyarea sysfillrect aesni_intel scsi_transport_sas hid fnic aes_x86_64 sysimgblt ptp crypto_simd libfcoe fb_sys_fops glue_helper ahci pps_core mxm_wmi
[  101.730450]  cryptd libfc libahci i2c_algo_bit drm scsi_transport_fc enic megaraid_sas wmi
[  101.730883] CPU: 6 PID: 3205 Comm: python3 Not tainted 4.15.0-041500rc7-generic #201801072330
[  101.731319] Hardware name: Cisco Systems Inc UCSC-C240-M4L/UCSC-C240-M4L, BIOS C240M4.2.0.10c.0.032320160820 03/23/2016
[  101.731773] RIP: 0010:__kmalloc_node+0x16a/0x2c0
[  101.732224] RSP: 0018:ffffa7d0cf86bbe0 EFLAGS: 00010206
[  101.732682] RAX: 0000000000000000 RBX: 3b37355eb8b32f18 RCX: 0000000000000349
[  101.733146] RDX: 0000000000000348 RSI: 0000000000000000 RDI: 0000000000027040
[  101.733609] RBP: ffffa7d0cf86bc20 R08: ffff94818ede9cdc R09: ffff9461bf807c00
[  101.734075] R10: ffffffffaaa16cc0 R11: c4c8a1df366db3c4 R12: 00000000014080c0
[  101.734547] R13: 0000000000000008 R14: ffff94818ede9cdc R15: ffff9461bf807c00
[  101.735023] FS:  00007f8b0a2c2700(0000) GS:ffff9461bfd80000(0000) knlGS:0000000000000000
[  101.735510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  101.735997] CR2: 000056075d0c11a8 CR3: 0000001fe0b32003 CR4: 00000000001606e0
[  101.736491] Call Trace:
[  101.736988]  ? alloc_cpumask_var_node+0x1f/0x30
[  101.737488]  ? on_each_cpu_cond+0x140/0x140
[  101.737986]  alloc_cpumask_var_node+0x1f/0x30
[  101.738489]  zalloc_cpumask_var_node+0xf/0x20
[  101.738988]  smpcfd_prepare_cpu+0x46/0xc0
[  101.739493]  cpuhp_invoke_callback+0x9b/0x550
[  101.740012]  ? init_idle+0x179/0x190
[  101.740515]  _cpu_up+0xb1/0x180
[  101.741017]  do_cpu_up+0x8b/0xb0
[  101.741515]  cpu_up+0x13/0x20
[  101.742012]  cpu_subsys_online+0x3d/0x90
[  101.742510]  device_online+0x4a/0x90
[  101.743010]  online_store+0x89/0xa0
[  101.743506]  dev_attr_store+0x18/0x30
[  101.744003]  sysfs_kf_write+0x37/0x40
[  101.744501]  kernfs_fop_write+0x11c/0x1a0
[  101.744998]  __vfs_write+0x37/0x170
[  101.745494]  ? common_file_perm+0x50/0x140
[  101.745994]  ? apparmor_file_permission+0x1a/0x20
[  101.746495]  ? security_file_permission+0x3b/0xc0
[  101.746993]  ? _cond_resched+0x19/0x40
[  101.747490]  vfs_write+0xb1/0x1a0
[  101.747988]  SyS_write+0x55/0xc0
[  101.748481]  entry_SYSCALL_64_fastpath+0x1e/0x81
[  101.748977] RIP: 0033:0x7f8b09ea24a0
[  101.749474] RSP: 002b:00007ffd5e22ba78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  101.749996] RAX: ffffffffffffffda RBX: 0000000001671410 RCX: 00007f8b09ea24a0
[  101.750490] RDX: 0000000000000002 RSI: 0000000001789410 RDI: 0000000000000003
[  101.750971] RBP: 0000000000a3e020 R08: 0000000000000000 R09: 0000000000000001
[  101.751436] R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000003
[  101.751885] R13: 0000000000501520 R14: 00007ffd5e22bee0 R15: 00007f8b08dbb240
[  101.752318] Code: 8b 18 4d 33 9f 40 01 00 00 4c 89 c3 4c 31 db 65 48 0f c7 0f 0f 94 c0 84 c0 0f 84 0e ff ff ff 4d 39 d8 74 14 49 63 47 20 48 01 c3 <48> 33 1b 49 33 9f 40 01 00 00 0f 18 0b 41 f7 c4 00 80 00 00 0f 
[  101.753201] RIP: __kmalloc_node+0x16a/0x2c0 RSP: ffffa7d0cf86bbe0
[  101.753642] ---[ end trace ef4dea51947a8216 ]---