At the moment on my dual-core laptop I see

top - 09:25:11 up 17:59,  6 users,  load average: 1.18, 1.16, 1.30
Tasks: 140 total,   4 running, 136 sleeping,   0 stopped,   0 zombie
Cpu(s): 33.7%us, 18.2%sy,  0.0%ni, 48.2%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2056952k total,  1962684k used,    94268k free,   122800k buffers
Swap:  3951952k total,    12612k used,  3939340k free,  1389820k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
 4592 klog      20   0  5532  488  428 R  100  0.0  94:43.82 klogd         


strace -p 4592
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
read(0, "", 4095)                       = 0
...


dpkg -l klogd
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  klogd          1.5-6.1        Kernel Logging Daemon

Kernel version 2.6.39-rc7+ (i.e., yesterday's snapshot, but I've seen
the problem on-and-off over a number of kernel versions)

FD 0 is /run/klogd/kmsg and fuser reports no other processes have it
open.

Restarting the dd to fill the pipe fixes the problem.

Peter C




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