/proc/diskstats shows broken values

Solution Verified - Updated -

Issue

  • /proc/diskstats shows broken values.
  • Here is the data of /proc/diskstats when this problem occurred.
    8   19 sdb3 62 32 1991 126 0 0 0 0 4294967295 3375491 4291591854
  • The 3rd value from the right should show the number of executing I/Os which is named in_flight in the kernel source, but it becomes 4294967295 (= -1).

Environment

  • Red Hat Enterprise Linux 5.3
    • Kernel Version: 2.6.18-128.1.1
  • Red Hat Enterprise Linux 6.0
    • kernel-2.6.32-71.14.1.el6

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