stopping amd causes a freeze

[Dominic Fandrey]

Occasionally stopping amd freezes my system. It's a rare occurrence,
and I haven't found a reliable way to reproduce it.

It's also a real freeze, so there's no way to get into the debugger
or grab a core dump. I only can perform the 4 seconds hard shutdown to
revive the system.

I run amd through sysutils/automounter, which is a scripting solution
that generates an amd.map file based on encountered devices and devd
events. The SIGHUP it sends to amd to tell it the map file was updated
does not cause problems, only a SIGKILL may cause the freeze.

Nothing was mounted (by amd) during the last freeze.

I don't see any angle to tackle this, but I'm throwing it out here
any way, in the hopes that someone actually has an idea how to approach
the issue.

# uname -a
FreeBSD mobileKamikaze.norad 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #0 r253413: Wed Jul 17 13:12:46 CEST 2013     root at mobileKamikaze.norad:/usr/obj/HP6510b-91/amd64/usr/src/sys/HP6510b-91  amd64

That's amd's starting message:
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  no logfile defined; using stderr
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  AM-UTILS VERSION INFORMATION:
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Copyright (c) 1997-2006 Erez Zadok
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Copyright (c) 1990 Jan-Simon Pendry
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Copyright (c) 1990 Imperial College of Science, Technology & Medicine
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Copyright (c) 1990 The Regents of the University of California.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  am-utils version 6.1.5 (build 901505).
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Report bugs to https://bugzilla.am-utils.org/ or am-utils at am-utils.org.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Configured by David O'Brien <obrien at FreeBSD.org> on date 4-December-2007 PST.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Built by root at mobileKamikaze.norad.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  cpu=amd64 (little-endian), arch=amd64, karch=amd64.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  full_os=freebsd9.2, os=freebsd9, osver=9.2, vendor=undermydesk, distro=The FreeBSD Project.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  domain=norad, host=mobileKamikaze, hostd=mobileKamikaze.norad.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Map support for: root, passwd, union, nis, ndbm, file, exec, error.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  AMFS: nfs, link, nfsx, nfsl, host, linkx, program, union, ufs, cdfs,
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:        pcfs, auto, direct, toplvl, error, inherit.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  FS: cd9660, nfs, nfs3, nullfs, msdosfs, ufs, unionfs.
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Network 1: wire="192.168.1.0" (netnumber=192.168.1).
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  Network 2: wire="192.168.0.0" (netnumber=192.168).
Jul 22 11:32:28 mobileKamikaze amd[8176]/info:  My ip addr is 127.0.0.1

amd is called with the flags -r -p -a -c 4 -w 2

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