Hi, I got this stack trace on an other node running the same 4.1.12 kernel, but this time on a live node (not during shutdown). [1181894.806808] Modules linked in: cbc rbd libceph ipmi_si mpt2sas raid_class scsi_transport_sas ipmi_devintf dell_rbu tun nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc bridge 8021q garp mrp stp llc bonding xfs libcrc32c bcache uhci_hcd ohci_hcd joydev hid_generic usbhid hid iTCO_wdt iTCO_vendor_support x86_pkg_temp_thermal coretemp kvm_intel dcdbas kvm shpchp aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper microcode evdev ehci_pci ehci_hcd sb_edac usbcore edac_core usb_common lpc_ich ipmi_msghandler mfd_core acpi_cpufreq processor wmi thermal_sys acpi_power_meter button ext4 crc16 mbcache jbd2 btrfs xor raid6_pq dm_mod sg sd_mod crc32c_intel igb megaraid_sas i2c_algo_bit i2c_core dca ptp scsi_mod pps_core [last unloaded: ipmi_si] [1181894.806839] CPU: 13 PID: 74 Comm: migration/13 Tainted: G L 4.1.12-ig1 #2 [1181894.806840] Hardware name: Dell Inc. PowerEdge R730xd/0H21J3, BIOS 1.1.4 11/03/2014 [1181894.806841] task: ffff8820786894b0 ti: ffff882078698000 task.ti: ffff882078698000 [1181894.806842] RIP: 0010:[<ffffffff810a72e6>] [<ffffffff810a72e6>] multi_cpu_stop+0x52/0x99 [1181894.806846] RSP: 0000:ffff88207869bdb8 EFLAGS: 00000293 [1181894.806847] RAX: 0000000000000000 RBX: 0000000000000187 RCX: ffff88207eccfd18 [1181894.806848] RDX: 0000000000000001 RSI: 0000000000000282 RDI: ffff88202f1e3bc0 [1181894.806849] RBP: 0000000000000001 R08: ffff882078698000 R09: ffff882078698000 [1181894.806850] R10: 0000000000000000 R11: ffff8820361280d0 R12: 0000000000000000 [1181894.806851] R13: ffff88207ecd4f00 R14: 0000000d00000004 R15: ffff88107f454f00 [1181894.806853] FS: 0000000000000000(0000) GS:ffff88207ecc0000(0000) knlGS:0000000000000000 [1181894.806854] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1181894.806855] CR2: 0000000016053400 CR3: 000000000160b000 CR4: 00000000001406e0 [1181894.806856] Stack: [1181894.806857] ffff8820361280d0 ffff88207eccfd10 ffff88202f1e3be8 ffff88202f1e3bc0 [1181894.806859] ffffffff810a7294 ffffffff810a718a ffff882078689a08 ffff8820786894b0 [1181894.806860] ffff88207ecd4f00 ffffffff8105bae5 ffff88207ecd4f00 ffff8820786894b0 [1181894.806862] Call Trace: [1181894.806865] [<ffffffff810a7294>] ? cpu_stop_should_run+0x3d/0x3d [1181894.806866] [<ffffffff810a718a>] ? cpu_stopper_thread+0x68/0xde [1181894.806868] [<ffffffff8105bae5>] ? finish_task_switch+0x51/0xcb [1181894.806871] [<ffffffff8138ff4f>] ? console_conditional_schedule+0xf/0xf [1181894.806872] [<ffffffff8138e43f>] ? __schedule+0x3f5/0x4e0 [1181894.806875] [<ffffffff81058604>] ? sort_range+0x19/0x19 [1181894.806877] [<ffffffff8105872a>] ? smpboot_thread_fn+0x126/0x13e [1181894.806878] [<ffffffff81056225>] ? kthread+0x99/0xa1 [1181894.806880] [<ffffffff8105618c>] ? __kthread_parkme+0x58/0x58 [1181894.806882] [<ffffffff81390d12>] ? ret_from_fork+0x42/0x70 [1181894.806883] [<ffffffff8105618c>] ? __kthread_parkme+0x58/0x58 [1181894.806884] Code: 02 00 00 e8 51 60 12 00 39 c5 41 0f 94 c4 eb 0e 89 ed 48 0f a3 28 19 ed 85 ed 41 0f 95 c4 31 c0 31 d2 eb 02 89 ea f3 90 8b 6b 20 <39> d5 74 20 83 fd 02 74 07 83 fd 03 75 10 eb 03 fa eb 0b 45 84 dmesg keeps filling with such message and devices are unresponsive. Forced to reboot. Regards, -- Open is better -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html