How to enable kernel pstore?











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I'm trying to enable the kernel persistent storage (pstore) in order to help debug a module which malfunctions and freezes my laptop on suspend, but I'm having difficulties doing so.
My kernel (4.1.20) config with related parameters is



# gunzip -c /proc/config.gz | grep PSTORE

CONFIG_CHROMEOS_PSTORE=m

CONFIG_PSTORE=y

CONFIG_PSTORE_CONSOLE=y

# CONFIG_PSTORE_PMSG is not set

# CONFIG_PSTORE_FTRACE is not set

CONFIG_PSTORE_RAM=m


I have also tried loading the ramoops module, but when I do



# cat /sys/module/pstore/parameters/backend

(null)


it doesn't seem to have enabled anything. /sys/fs/pstore is empty as well, altough mount says that it is mounted. I have tried to panic my kernel using this but nothing showed up.



What am I doing wrong? Is it even supposed to work on a normal laptop, or am I completely in the dark? I could not find very much while looking for this feature.






kernel-modules debugging







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    up vote
    4
    down vote

    favorite
    3












    I'm trying to enable the kernel persistent storage (pstore) in order to help debug a module which malfunctions and freezes my laptop on suspend, but I'm having difficulties doing so.
    My kernel (4.1.20) config with related parameters is



    # gunzip -c /proc/config.gz | grep PSTORE
    
CONFIG_CHROMEOS_PSTORE=m
    
CONFIG_PSTORE=y
    
CONFIG_PSTORE_CONSOLE=y
    
# CONFIG_PSTORE_PMSG is not set
    
# CONFIG_PSTORE_FTRACE is not set
    
CONFIG_PSTORE_RAM=m


    I have also tried loading the ramoops module, but when I do



    # cat /sys/module/pstore/parameters/backend
    
(null)


    it doesn't seem to have enabled anything. /sys/fs/pstore is empty as well, altough mount says that it is mounted. I have tried to panic my kernel using this but nothing showed up.



    What am I doing wrong? Is it even supposed to work on a normal laptop, or am I completely in the dark? I could not find very much while looking for this feature.






    kernel-modules debugging







    share|improve this question














    bumped to the homepage by Community♦ 2 days ago


    This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

















      up vote
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      down vote

      favorite
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      up vote
      4
      down vote

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      3





      I'm trying to enable the kernel persistent storage (pstore) in order to help debug a module which malfunctions and freezes my laptop on suspend, but I'm having difficulties doing so.
      My kernel (4.1.20) config with related parameters is



      # gunzip -c /proc/config.gz | grep PSTORE
      
CONFIG_CHROMEOS_PSTORE=m
      
CONFIG_PSTORE=y
      
CONFIG_PSTORE_CONSOLE=y
      
# CONFIG_PSTORE_PMSG is not set
      
# CONFIG_PSTORE_FTRACE is not set
      
CONFIG_PSTORE_RAM=m


      I have also tried loading the ramoops module, but when I do



      # cat /sys/module/pstore/parameters/backend
      
(null)


      it doesn't seem to have enabled anything. /sys/fs/pstore is empty as well, altough mount says that it is mounted. I have tried to panic my kernel using this but nothing showed up.



      What am I doing wrong? Is it even supposed to work on a normal laptop, or am I completely in the dark? I could not find very much while looking for this feature.






      kernel-modules debugging







      share|improve this question













      I'm trying to enable the kernel persistent storage (pstore) in order to help debug a module which malfunctions and freezes my laptop on suspend, but I'm having difficulties doing so.
      My kernel (4.1.20) config with related parameters is



      # gunzip -c /proc/config.gz | grep PSTORE
      
CONFIG_CHROMEOS_PSTORE=m
      
CONFIG_PSTORE=y
      
CONFIG_PSTORE_CONSOLE=y
      
# CONFIG_PSTORE_PMSG is not set
      
# CONFIG_PSTORE_FTRACE is not set
      
CONFIG_PSTORE_RAM=m


      I have also tried loading the ramoops module, but when I do



      # cat /sys/module/pstore/parameters/backend
      
(null)


      it doesn't seem to have enabled anything. /sys/fs/pstore is empty as well, altough mount says that it is mounted. I have tried to panic my kernel using this but nothing showed up.



      What am I doing wrong? Is it even supposed to work on a normal laptop, or am I completely in the dark? I could not find very much while looking for this feature.






      kernel-modules debugging




      kernel-modules debugging






      share|improve this question













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      asked Mar 31 '16 at 9:29









      D.S

      40137




      40137





      bumped to the homepage by Community♦ 2 days ago


      This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.







      bumped to the homepage by Community♦ 2 days ago


      This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
























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          You need to determine a piece of memory that survives a reboot. Then it's probably the easiest approach to pass that via kernel parameters, see
          the ramoops Documentation in the kernel tree.






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            You need to determine a piece of memory that survives a reboot. Then it's probably the easiest approach to pass that via kernel parameters, see
            the ramoops Documentation in the kernel tree.






            share|improve this answer

























              up vote
              0
              down vote













              You need to determine a piece of memory that survives a reboot. Then it's probably the easiest approach to pass that via kernel parameters, see
              the ramoops Documentation in the kernel tree.






              share|improve this answer























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                down vote









                You need to determine a piece of memory that survives a reboot. Then it's probably the easiest approach to pass that via kernel parameters, see
                the ramoops Documentation in the kernel tree.






                share|improve this answer












                You need to determine a piece of memory that survives a reboot. Then it's probably the easiest approach to pass that via kernel parameters, see
                the ramoops Documentation in the kernel tree.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Aug 8 at 19:11









                Uwe Kleine-König

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