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[David Bartley <andareed@xxxxxxxxx>]

In my case this ended up being a bad power supply.

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https://bugs.launchpad.net/bugs/1159065

Title:
  kernel hard freezes unless processor.max_cstates=1 is used

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  My system hard freezes, no response to MagicKeys + REISUB,  no error messages in /var/log/syslog or kern.log.  Cannot ping or ssh.
  This happens consistently after running for 24-48 hours.    When I use process.max_cstates=1 I have no problems with freezes, but I would like my cpus to enter in deeper cstates for power saving.
  I've tried kernel versions 3.2, 3.5, and 3.6.9
  Hardware:
    Intel i7-3930k,  Motherboard: DX79TO

  Partial output of dmesg:

  [    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.6.9-030609-generic root=UUID=61abb01f-8268-421b-a83f-e0fcea737f56 ro crashkernel=384M-2G:64M,2G-:128M quiet splash notsc acpi_enforce_resources=lax clocksource=hpet hpet=force acpi=hpet intel_idle.max_cstate=0 processor.max_cstate=1 idle=mwait
  [    0.000000] tsc: Kernel compiled with CONFIG_X86_TSC, cannot disable TSC completely
  [    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
  [    0.000000] __ex_table already sorted, skipping sort
  [    0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x340
  [    0.000000] Checking aperture...
  [    0.000000] No AGP bridge found
  [    0.000000] Calgary: detecting Calgary via BIOS EBDA area
  [    0.000000] Calgary: Unable to locate Rio Grande table in EBDA - bailing!
  [    0.000000] Memory: 16209188k/17301504k available (6894k kernel code, 601880k absent, 490436k reserved, 6299k data, 956k init)
  [    0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=16, Nodes=1
  [    0.000000] Hierarchical RCU implementation.
  [    0.000000] 	RCU dyntick-idle grace-period acceleration is enabled.
  [    0.000000] 	RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=16.
  [    0.000000] NR_IRQS:16640 nr_irqs:1216 16
  [    0.000000] Extended CMOS year: 2000
  [    0.000000] Console: colour VGA+ 80x25
  [    0.000000] console [tty0] enabled
  [    0.000000] allocated 67108864 bytes of page_cgroup
  [    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups
  [    0.000000] hpet clockevent registered
  [    0.000000] tsc: Fast TSC calibration using PIT
  [    0.004000] tsc: Detected 3199.972 MHz processor
  [    0.004000] Calibrating delay loop... 6361.08 BogoMIPS (lpj=12722176)
  [    0.028000] pid_max: default: 32768 minimum: 301
  [    0.028000] Security Framework initialized
  [    0.028000] AppArmor: AppArmor initialized
  [    0.028000] Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes)
  [    0.028000] Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes)
  [    0.032000] Mount-cache hash table entries: 256
  [    0.032000] Initializing cgroup subsys cpuacct
  [    0.032000] Initializing cgroup subsys memory
  [    0.032000] Initializing cgroup subsys devices
  [    0.032000] Initializing cgroup subsys freezer
  [    0.032000] Initializing cgroup subsys blkio
  [    0.032000] Initializing cgroup subsys perf_event
  [    0.032000] Initializing cgroup subsys hugetlb
  [    0.032000] CPU: Physical Processor ID: 0
  [    0.032000] CPU: Processor Core ID: 0
  [    0.032000] mce: CPU supports 18 MCE banks
  [    0.032000] CPU0: Thermal monitoring enabled (TM1)
  [    0.032000] process: using mwait in idle threads
  [    0.032000] Last level iTLB entries: 4KB 512, 2MB 0, 4MB 0
  [    0.032000] Last level dTLB entries: 4KB 512, 2MB 32, 4MB 32
  [    0.032000] tlb_flushall_shift is 0x5
  [    0.032000] ACPI: Core revision 20120711
  [    0.040000] ftrace: allocating 28053 entries in 110 pages
  [    0.052000] dmar: Host address width 40
  [    0.052000] dmar: DRHD base: 0x000000fe901000 flags: 0x0
  [    0.052000] dmar: IOMMU 0: reg_base_addr fe901000 ver 1:0 cap d2008c10ef0462 ecap f0207a
  [    0.052000] dmar: DRHD base: 0x000000fe900000 flags: 0x1
  [    0.052000] dmar: IOMMU 1: reg_base_addr fe900000 ver 1:0 cap d2078c106f0462 ecap f020fe
  [    0.052000] dmar: RMRR base: 0x000000d8dd9000 end: 0x000000d8dd9fff
  [    0.052000] dmar: RMRR base: 0x000000d8ddb000 end: 0x000000d8ddbfff
  [    0.052000] Switched APIC routing to physical flat.
  [    0.052000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
  [    0.092000] smpboot: CPU0: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz stepping 07
  [    0.092000] Performance Events: PEBS fmt1+, 16-deep LBR, SandyBridge events, Intel PMU driver.
  [    0.092000] ... version:                3
  [    0.092000] ... bit width:              48
  [    0.092000] ... generic registers:      4
  [    0.092000] ... value mask:             0000ffffffffffff
  [    0.092000] ... max period:             000000007fffffff
  [    0.092000] ... fixed-purpose events:   3
  [    0.092000] ... event mask:             000000070000000f
  [    0.092000] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
  [    0.092000] smpboot: Booting Node   0, Processors  #1
  [    0.104000] TSC synchronization [CPU#0 -> CPU#1]:
  [    0.104000] Measured 487730108 cycles TSC warp between CPUs, turning off TSC clock.
  [    0.008000] tsc: Marking TSC unstable due to check_tsc_sync_source failed
  [    0.104006]  #2 #3 #4 #5 #6 #7 #8 #9 #10 #11
  [    0.216013] Brought up 12 CPUs
  [    0.216013] smpboot: Total of 12 processors activated (76333.05 BogoMIPS)
  [    0.220013] devtmpfs: initialized
  [    0.224014] EVM: security.selinux
  [    0.224014] EVM: security.SMACK64
  [    0.224014] EVM: security.capability
  [    0.224014] PM: Registering ACPI NVS region [mem 0xd84a9000-0xd858cfff] (933888 bytes)
  [    0.224014] PM: Registering ACPI NVS region [mem 0xd89c7000-0xd8ac6fff] (1048576 bytes)
  [    0.224014] PM: Registering ACPI NVS region [mem 0xdb704000-0xdb7befff] (765952 bytes)
  [    0.224014] dummy:

  2)
  Description:	Ubuntu 12.04.2 LTS
  Release:	12.04

  3)  Not to crash after 24 hours
  4) Hard freezes
  ---
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  DistroRelease: Ubuntu 12.04
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Tags:  precise running-unity
  Uname: Linux 3.6.9-030609-generic x86_64
  UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers

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