Package: src:linux Version: 3.16.7-ckt25-2+deb8u3~bpo70+1 Severity: normal The system is running the wheezy release.
After some fibre channel multipathing issues, my system ended up endlessly printing messages like the one below for each of 32 cpus, every 3 sec. However the problem occurs in more common situations than this - it sometimes occurs during boot-up, both from cold start and warm reboot. This seems to be worse in the 3.16 kernels, we never had issues like this with 3.2 but had to move up to 3.16 for other issues related to power management. The BIOS has been adjusted to turn off all C state support, the system runs at maximum performance. Do you have any advice on measures to track this down more precisely? -- Package-specific info: ** Version: Linux version 3.16.0-0.bpo.4-amd64 (debian-ker...@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.16.7-ckt25-2+deb8u3~bpo70+1 (2016-07-07) ** Command line: BOOT_IMAGE=/boot/vmlinuz-3.16.0-0.bpo.4-amd64 root=UUID=084a5068-b421-47bb-8eb3-f62516498242 ro console=ttyS0,9600n8 console=tty0 ** Not tainted [205127.516687] NMI backtrace for cpu 28 [205127.516692] CPU: 28 PID: 0 Comm: swapper/28 Not tainted 3.16.0-0.bpo.4-amd64 #1 Debian 3.16.7-ckt25-2+deb8u3~bpo70+1 [205127.516693] Hardware name: Dell Inc. PowerEdge R820/04K5X5, BIOS 1.5.0 03/08/2013 [205127.516695] task: ffff880c0ea20310 ti: ffff880c0ea2c000 task.ti: ffff880c0ea2c000 [205127.516697] RIP: 0010:[<ffffffff81342c6c>] [<ffffffff81342c6c>] intel_idle+0xcc/0x160 [205127.516702] RSP: 0018:ffff880c0ea2fe18 EFLAGS: 00000046 [205127.516704] RAX: 0000000000000030 RBX: 0000000000000010 RCX: 0000000000000001 [205127.516705] RDX: 0000000000000000 RSI: ffff880c0ea2ffd8 RDI: 000000000000001c [205127.516706] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000005d20 [205127.516707] R10: 0000000000000000 R11: 00000001030e17d1 R12: 0000000000000030 [205127.516708] R13: 0000000000000004 R14: 0000000000000005 R15: ffff880c0ea2c000 [205127.516710] FS: 0000000000000000(0000) GS:ffff880c3fbc0000(0000) knlGS:0000000000000000 [205127.516712] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [205127.516713] CR2: 00007f6452f3de30 CR3: 0000000001811000 CR4: 00000000000407e0 [205127.516714] Stack: [205127.516715] 0000000000000000 0000001c00f38f2d ffffffff8101e085 ffffe8f4003c0308 [205127.516718] 0000babd0c6ce19b ffffffff8189b6f0 ffffffff8189b520 ffffffff8140e8e1 [205127.516720] 0000000000000000 0000000000f38f2d 000000000000d740 ffffffff818e0540 [205127.516723] Call Trace: [205127.516724] [<ffffffff8101e085>] ? read_tsc+0x5/0x20 [205127.516729] [<ffffffff8140e8e1>] ? cpuidle_enter_state+0x51/0xf0 [205127.516732] [<ffffffff810b1e7a>] ? cpu_startup_entry+0x34a/0x4b0 [205127.516736] [<ffffffff81047888>] ? start_secondary+0x218/0x2d0 [205127.516739] Code: 31 d2 65 48 8b 34 25 48 b8 00 00 48 89 d1 48 8d 86 38 c0 ff ff 0f 01 c8 48 8b 86 38 c0 ff ff a8 08 75 08 b1 01 4c 89 e0 0f 01 c9 <65> 48 8b 04 25 48 b8 00 00 f0 80 a0 3a c0 ff ff df 0f ae f0 48 ** Model information sys_vendor: Dell Inc. product_name: PowerEdge R820 product_version: chassis_vendor: Dell Inc. chassis_version: bios_vendor: Dell Inc. bios_version: 1.5.0 board_vendor: Dell Inc. board_name: 04K5X5 board_version: A06 ** Loaded modules: autofs4 nfsd nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss oid_registry nfsv4 dns_resolver nfs lockd sunrpc fscache xfs libcrc32c dm_round_robin loop dm_multipath scsi_dh x86_pkg_temp_thermal intel_powerclamp intel_rapl coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ttm drm_kms_helper aesni_intel drm aes_x86_64 iTCO_wdt mei_me lrw i2c_algo_bit iTCO_vendor_support gf128mul sb_edac glue_helper lpc_ich mei i2c_core ioatdma dcdbas mfd_core edac_core ablk_helper pcspkr evdev joydev processor shpchp acpi_pad ipmi_si tpm_tis button thermal_sys dca cryptd ipmi_msghandler wmi acpi_power_meter tpm ext4 crc16 mbcache jbd2 dm_mod hid_generic usbhid hid sg sr_mod cdrom sd_mod ehci_pci crc_t10dif ehci_hcd crct10dif_common ahci qla2xxx libahci usbcore usb_common scsi_transport_fc tg3 libata megaraid_sas scsi_tgt ptp crc32c_intel scsi_mod pps_core libphy Vince --