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how to identify kernel problems from message log file


Kernel Log “TCP: Treason uncloaked!”How to add message that will be read with dmesg?Can only see 2GB of 4GB on 2.6.26-1-xen-amd64 debian 5, Dell PowerEdge 860Kernel config file generatorSYN Flooding kernel messageLinux kernel module file sizeLinux [Hardware Error] message from kernelHow to disable perf subsystem in Linux kernel?Server freezes without kernel panicPrevent kernel messages from appearing in dmesg













0















dear friends and colleges



we notice about unexpected freezed of one of our critical linux machines server linux - version - 7.2



this is VM machines



and now I am working to understand what the root cause that server was freezed



from the messages log I see lines that never seen on other machine ( or maybe I am wrong )



Feb  7 10:32:34 little_indian_boy kernel: Linux version 3.10.0-327.el7.x86_64 (mockbuild@x86-034.build.eng.bos.redhat.com) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Oct 29 17:29:29 EDT 2015

Feb  7 10:32:34 little_indian_boy kernel: Command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.el7.x86_64 root=/dev/mapper/vg00-lv_root ro crashkernel=auto rd.lvm.lv=vg00/lv_root rd.lvm.lv=vg00/lv_swap rhgb quiet LANG=en_US.UTF-8

Feb  7 10:32:34 little_indian_boy kernel: Disabled fast string operations

Feb  7 10:32:34 little_indian_boy kernel: e820: BIOS-provided physical RAM map:

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000bfedffff] usable

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfee0000-0x00000000bfefefff] ACPI data

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfeff000-0x00000000bfefffff] ACPI NVS

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bff00000-0x00000000bfffffff] usable

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec0ffff] reserved

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fffe0000-0x00000000ffffffff] reserved

Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000100000000-0x000000203fffffff] usable

Feb  7 10:32:34 little_indian_boy kernel: NX (Execute Disable) protection: active

Feb  7 10:32:34 little_indian_boy kernel: SMBIOS 2.7 present.

Feb  7 10:32:34 little_indian_boy kernel: Hypervisor detected: VMware

Feb  7 10:32:34 little_indian_boy kernel: AGP: No AGP bridge found

Feb  7 10:32:34 little_indian_boy kernel: e820: last_pfn = 0x2040000 max_arch_pfn = 0x400000000

Feb  7 10:32:34 little_indian_boy kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106

Feb  7 10:32:34 little_indian_boy kernel: total RAM covered: 261120M

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 64K #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 128K #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 256K #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 512K #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 1M #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 2M #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 4M #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 8M #011num_reg: 8  #011lose cover RAM: 0G

Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 16M #011num_reg: 8  #011lose cover RAM: 0G

is this lines are indicate on problem ?



gran_size: 64K #011chunk_size: 16M #011num_reg: 8 #011lose cover RAM: 0G


we also see that



 kernel: mtrr_cleanup: can not find optimal value

 kernel: please specify mtrr_gran_size/mtrr_chunk_size

 e820: last_pfn = 0xc0000 max_arch_pfn = 0x400000000

 found SMP MP-table at [mem 0x000f6a80-0x000f6a8f] mapped at [ffff8800000f6a80]

 kernel: Using GB pages for direct mapping





linux redhat kernel dmesg






share



























    0















    dear friends and colleges



    we notice about unexpected freezed of one of our critical linux machines server linux - version - 7.2



    this is VM machines



    and now I am working to understand what the root cause that server was freezed



    from the messages log I see lines that never seen on other machine ( or maybe I am wrong )



    Feb  7 10:32:34 little_indian_boy kernel: Linux version 3.10.0-327.el7.x86_64 (mockbuild@x86-034.build.eng.bos.redhat.com) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Oct 29 17:29:29 EDT 2015
    
Feb  7 10:32:34 little_indian_boy kernel: Command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.el7.x86_64 root=/dev/mapper/vg00-lv_root ro crashkernel=auto rd.lvm.lv=vg00/lv_root rd.lvm.lv=vg00/lv_swap rhgb quiet LANG=en_US.UTF-8
    
Feb  7 10:32:34 little_indian_boy kernel: Disabled fast string operations
    
Feb  7 10:32:34 little_indian_boy kernel: e820: BIOS-provided physical RAM map:
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000bfedffff] usable
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfee0000-0x00000000bfefefff] ACPI data
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfeff000-0x00000000bfefffff] ACPI NVS
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bff00000-0x00000000bfffffff] usable
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec0ffff] reserved
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fffe0000-0x00000000ffffffff] reserved
    
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000100000000-0x000000203fffffff] usable
    
Feb  7 10:32:34 little_indian_boy kernel: NX (Execute Disable) protection: active
    
Feb  7 10:32:34 little_indian_boy kernel: SMBIOS 2.7 present.
    
Feb  7 10:32:34 little_indian_boy kernel: Hypervisor detected: VMware
    
Feb  7 10:32:34 little_indian_boy kernel: AGP: No AGP bridge found
    
Feb  7 10:32:34 little_indian_boy kernel: e820: last_pfn = 0x2040000 max_arch_pfn = 0x400000000
    
Feb  7 10:32:34 little_indian_boy kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
    
Feb  7 10:32:34 little_indian_boy kernel: total RAM covered: 261120M
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 64K #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 128K #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 256K #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 512K #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 1M #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 2M #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 4M #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 8M #011num_reg: 8  #011lose cover RAM: 0G
    
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 16M #011num_reg: 8  #011lose cover RAM: 0G
    
is this lines are indicate on problem ?
    

    
gran_size: 64K #011chunk_size: 16M #011num_reg: 8 #011lose cover RAM: 0G


    we also see that



     kernel: mtrr_cleanup: can not find optimal value
    
 kernel: please specify mtrr_gran_size/mtrr_chunk_size
    
 e820: last_pfn = 0xc0000 max_arch_pfn = 0x400000000
    
 found SMP MP-table at [mem 0x000f6a80-0x000f6a8f] mapped at [ffff8800000f6a80]
    
 kernel: Using GB pages for direct mapping





    linux redhat kernel dmesg






    share

























      0












      0








      0








      dear friends and colleges



      we notice about unexpected freezed of one of our critical linux machines server linux - version - 7.2



      this is VM machines



      and now I am working to understand what the root cause that server was freezed



      from the messages log I see lines that never seen on other machine ( or maybe I am wrong )



      Feb  7 10:32:34 little_indian_boy kernel: Linux version 3.10.0-327.el7.x86_64 (mockbuild@x86-034.build.eng.bos.redhat.com) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Oct 29 17:29:29 EDT 2015
      
Feb  7 10:32:34 little_indian_boy kernel: Command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.el7.x86_64 root=/dev/mapper/vg00-lv_root ro crashkernel=auto rd.lvm.lv=vg00/lv_root rd.lvm.lv=vg00/lv_swap rhgb quiet LANG=en_US.UTF-8
      
Feb  7 10:32:34 little_indian_boy kernel: Disabled fast string operations
      
Feb  7 10:32:34 little_indian_boy kernel: e820: BIOS-provided physical RAM map:
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000bfedffff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfee0000-0x00000000bfefefff] ACPI data
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfeff000-0x00000000bfefffff] ACPI NVS
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bff00000-0x00000000bfffffff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec0ffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fffe0000-0x00000000ffffffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000100000000-0x000000203fffffff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: NX (Execute Disable) protection: active
      
Feb  7 10:32:34 little_indian_boy kernel: SMBIOS 2.7 present.
      
Feb  7 10:32:34 little_indian_boy kernel: Hypervisor detected: VMware
      
Feb  7 10:32:34 little_indian_boy kernel: AGP: No AGP bridge found
      
Feb  7 10:32:34 little_indian_boy kernel: e820: last_pfn = 0x2040000 max_arch_pfn = 0x400000000
      
Feb  7 10:32:34 little_indian_boy kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
      
Feb  7 10:32:34 little_indian_boy kernel: total RAM covered: 261120M
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 64K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 128K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 256K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 512K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 1M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 2M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 4M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 8M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 16M #011num_reg: 8  #011lose cover RAM: 0G
      
is this lines are indicate on problem ?
      

      
gran_size: 64K #011chunk_size: 16M #011num_reg: 8 #011lose cover RAM: 0G


      we also see that



       kernel: mtrr_cleanup: can not find optimal value
      
 kernel: please specify mtrr_gran_size/mtrr_chunk_size
      
 e820: last_pfn = 0xc0000 max_arch_pfn = 0x400000000
      
 found SMP MP-table at [mem 0x000f6a80-0x000f6a8f] mapped at [ffff8800000f6a80]
      
 kernel: Using GB pages for direct mapping





      linux redhat kernel dmesg






      share














      dear friends and colleges



      we notice about unexpected freezed of one of our critical linux machines server linux - version - 7.2



      this is VM machines



      and now I am working to understand what the root cause that server was freezed



      from the messages log I see lines that never seen on other machine ( or maybe I am wrong )



      Feb  7 10:32:34 little_indian_boy kernel: Linux version 3.10.0-327.el7.x86_64 (mockbuild@x86-034.build.eng.bos.redhat.com) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Oct 29 17:29:29 EDT 2015
      
Feb  7 10:32:34 little_indian_boy kernel: Command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.el7.x86_64 root=/dev/mapper/vg00-lv_root ro crashkernel=auto rd.lvm.lv=vg00/lv_root rd.lvm.lv=vg00/lv_swap rhgb quiet LANG=en_US.UTF-8
      
Feb  7 10:32:34 little_indian_boy kernel: Disabled fast string operations
      
Feb  7 10:32:34 little_indian_boy kernel: e820: BIOS-provided physical RAM map:
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000bfedffff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfee0000-0x00000000bfefefff] ACPI data
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bfeff000-0x00000000bfefffff] ACPI NVS
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000bff00000-0x00000000bfffffff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec0ffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x00000000fffe0000-0x00000000ffffffff] reserved
      
Feb  7 10:32:34 little_indian_boy kernel: BIOS-e820: [mem 0x0000000100000000-0x000000203fffffff] usable
      
Feb  7 10:32:34 little_indian_boy kernel: NX (Execute Disable) protection: active
      
Feb  7 10:32:34 little_indian_boy kernel: SMBIOS 2.7 present.
      
Feb  7 10:32:34 little_indian_boy kernel: Hypervisor detected: VMware
      
Feb  7 10:32:34 little_indian_boy kernel: AGP: No AGP bridge found
      
Feb  7 10:32:34 little_indian_boy kernel: e820: last_pfn = 0x2040000 max_arch_pfn = 0x400000000
      
Feb  7 10:32:34 little_indian_boy kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
      
Feb  7 10:32:34 little_indian_boy kernel: total RAM covered: 261120M
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 64K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 128K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 256K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 512K #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 1M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 2M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 4M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 8M #011num_reg: 8  #011lose cover RAM: 0G
      
Feb  7 10:32:34 little_indian_boy kernel: gran_size: 64K #011chunk_size: 16M #011num_reg: 8  #011lose cover RAM: 0G
      
is this lines are indicate on problem ?
      

      
gran_size: 64K #011chunk_size: 16M #011num_reg: 8 #011lose cover RAM: 0G


      we also see that



       kernel: mtrr_cleanup: can not find optimal value
      
 kernel: please specify mtrr_gran_size/mtrr_chunk_size
      
 e820: last_pfn = 0xc0000 max_arch_pfn = 0x400000000
      
 found SMP MP-table at [mem 0x000f6a80-0x000f6a8f] mapped at [ffff8800000f6a80]
      
 kernel: Using GB pages for direct mapping





      linux redhat kernel dmesg




      linux redhat kernel dmesg





      share












      share










      share



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      shalomshalom

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