100% CPU usage

[Johan]

I ran bt a couple of times and it returned either

#0 0x00007f09d575e363 in epoll_wait () at ../sysdeps/unix/syscall-template.S:82
#1 0x00007f09d7322042 in comm_select ()
#2 0x00007f09d73e274e in CommSelectEngine::checkEvents(int) ()
#3 0x00007f09d7337ce1 in EventLoop::checkEngine(AsyncEngine*, bool) ()
#4 0x00007f09d7337f6d in EventLoop::runOnce() ()
#5 0x00007f09d7338058 in EventLoop::run() ()
#6 0x00007f09d7385e25 in SquidMain(int, char**) ()
#7 0x00007f09d72e4e6b in main ()

or

#0 0x00007f09d6bddd2d in read () at ../sysdeps/unix/syscall-template.S:82
#1 0x00007f09d733c1cc in default_read_method(int, char*, int) ()
#2 0x00007f09d73dbad5 in CommIO::FlushPipe() ()
#3 0x00007f09d73dbb08 in CommIO::NULLFDHandler(int, void*) ()
#4 0x00007f09d7322106 in comm_select ()
#5 0x00007f09d73e274e in CommSelectEngine::checkEvents(int) ()
#6 0x00007f09d7337ce1 in EventLoop::checkEngine(AsyncEngine*, bool) ()
#7 0x00007f09d7337f6d in EventLoop::runOnce() ()
#8 0x00007f09d7338058 in EventLoop::run() ()
#9 0x00007f09d7385e25 in SquidMain(int, char**) ()
#10 0x00007f09d72e4e6b in main ()

No idea on how to reproduce it other than leaving it running and using it.

1) Description: Ubuntu 12.04.2 LTS
Release: 12.04

2) squid-deb-proxy:
  Installed: 0.6.3.1
  Candidate: 0.6.3.1
  Version table:
 *** 0.6.3.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.6.3 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

3) I expected a working cache system and relatively low CPU usage

4) It used 100% CPU.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brendan_P (brendan-p)]

Seeing the same thing. Did you find a work-around?

[Brendan_P (brendan-p)]

Apologies, just seen this is a duplicate bug. Will ask on original.