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 ]--- -- 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/1733662 Title: System hang with Linux kernel 4.13, not with 4.10 Status in linux package in Ubuntu: In Progress Status in linux-hwe package in Ubuntu: New Status in linux source package in Artful: In Progress Status in linux-hwe source package in Artful: New Status in linux source package in Bionic: In Progress Status in linux-hwe source package in Bionic: New Bug description: In doing Ubuntu 17.10 regression testing, we've encountered one computer (boldore, a Cisco UCS C240 M4 [VIC]), that hangs about one in four times when running our cpu_offlining test. This test attempts to take all the CPU cores offline except one, then brings them back online again. This test ran successfully on boldore with previous releases, but with 17.10, the system sometimes (about one in four runs) hangs. Reverting to Ubuntu 16.04.3, I found no problems; but when I upgraded the 16.04.3 installation to linux- image-4.13.0-16-generic, the problem appeared again, so I'm confident this is a problem with the kernel. I'm attaching two files, dmesg- output-4.10.txt and dmesg-output-4.13.txt, which show the dmesg output that appears when running the cpu_offlining test with 4.10.0-38 and 4.13.0-16 kernels, respectively; the system hung on the 4.13 run. (I was running "dmesg -w" in a second SSH login; the files are cut-and- pasted from that.) I initiated this bug report from an Ubuntu 16.04.3 installation running a 4.10 kernel; but as I said, this applies to the 4.13 kernel. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.10.0-38-generic 4.10.0-38.42~16.04.1 ProcVersionSignature: User Name 4.10.0-38.42~16.04.1-generic 4.10.17 Uname: Linux 4.10.0-38-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 Date: Tue Nov 21 17:36:06 2017 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-hwe UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1733662/+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
