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Linux kernel oops

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Linux kernel oops

Linux kernel oops
Linux kernel oops on SPARC.
Linux kernel oops on PA-RISC with a dead ASCII cow

In computing, an oops is a deviation from correct behavior of the Linux kernel, one that produces a certain error log. The better-known kernel panic condition results from many kinds of oops, but other instances of an oops event may allow continued operation with compromised reliability. The term does not stand for anything, other than that it is a simple mistake.

When the kernel detects a problem, it kills any offending processes and prints an oops message, which Linux kernel engineers can use in debugging the condition that created the oops and fixing the underlying programming error. After a system has experienced an oops, some internal resources may no longer be operational. Thus, even if the system appears to work correctly, undesirable side effects may have resulted from the active task being killed. A kernel oops often leads to a kernel panic when the system attempts to use resources that have been lost.

The official Linux kernel documentation regarding oops messages resides in the file Documentation/oops-tracing.txt[1] of the kernel sources. Some logger configurations may affect the ability to collect oops messages.[2] The kerneloops software can collect and submit kernel oopses to a repository such as the www.kerneloops.org website,[3] which provides statistics and public access to reported oopses.

For a person not familiar with technical details of computers and operating systems, an oops message might look confusing. Unlike other operating systems such as Windows or OS X, Linux chooses to present details explaining the crash of the kernel rather than display a simplified, user-friendly message.

See also

  • kdump (Linux) – Linux kernel's crash dump mechanism, which internally uses kexec
  • System.map – contains mappings between symbol names and their addresses in memory, used to interpret oopses

References

  1. ^ http://www.kernel.org/doc/Documentation/oops-tracing.txt
  2. ^ "DevDocs/KernelOops". madwifi-project.org. 
  3. ^ "kerneloops(8) - Linux man page". 

Further reading

  • , 3rd edition, Chapter 4.Linux Device Drivers
  • John Bradford (2003-03-08). "Re: what's an OOPS".  
  • Szakacsits Szabolcs (2003-03-08). "Re: what's an OOPS". LKML (Mailing list). Retrieved 2006-05-22. 
  • Al Viro (2008-01-14). "OOPS report analysis". LKML (Mailing list). Retrieved 2008-01-14. 
  • Kernel Oops Howto (the madwifi project) Useful information on configuration files and tools to help display oops messages. Also lots of other links.

External links

  • oops.kernel.org, a public service collecting kernel oops reports
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