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Date: Mon, 09 Mar 2009 19:29:59 -0700
From: Tim Kientzle <kientzle@freebsd.org>
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To: Pegasus Mc Cleaft <ken@mthelicon.com>
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Cc: current@freebsd.org
Subject: Re: bsdtar lockup on Current-03/10/2009
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Pegasus Mc Cleaft wrote:
> 
> 	I was wondering if anyone else is seeing this problem: Any use of bsdtar to 
> create a new archive causes the process to be unresponsive to all signals and 
> consumes 100% cpu time. The machine I am testing on is a Core 2 quad running 
> in AMD64 (8 gigs ram, zfs boot, root, et al.)

I just merged a lot of changes into FreeBSD-CURRENT.
Any of the following would help me diagnose this:

  * libarchive and bsdtar have test suites:
      $ cd /usr/src/lib/libarchive && make check
      $ cd /usr/src/usr.bin/tar && make check
    Any errors are suspect.

  * A stack trace from gdb is most useful if both
    libarchive and bsdtar are built with debugging symbols:
      $ cd /usr/src/lib/libarchive
      $ make DEBUG_FLAGS=-g clean all install
      $ cd /usr/src/usr.bin/tar
      $ make DEBUG_FLAGS=-g clean all install
      $ gdb tar
      > run -cvf /dev/null /
      Control-C
      > bt

  * A system call trace is also very helpful:
      $ ktrace tar -cvf /dev/null *
    Email me <kientzle@freebsd.org> the ktrace.out file.

Any of the above would help me to narrow the
problem down quite a bit.  I'll also try to
reproduce it here.

Cheers,

Tim