bin/51505: amd in 7.0_STABLE can segfault

[mark%ecs.vuw.ac.nz@localhost]

>Number:         51505
>Category:       bin
>Synopsis:       amd in 7.0_STABLE can segfault
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 25 05:20:00 +0000 2016
>Originator:     Mark Davies
>Release:        NetBSD 7.0_STABLE
>Organization:
ECS, Victoria Uni. of Wellington, New Zealand.
>Environment:
	
	
System: NetBSD turakirae.ecs.vuw.ac.nz 7.0_STABLE NetBSD 7.0_STABLE (GENERIC) #6: Tue Mar 15 21:15:42 NZDT 2016 mark%turakirae.ecs.vuw.ac.nz@localhost:/local/SAVE/7_64.obj/src/work/7/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	amd will occasionally segfault on various of our machines.
	The backtrace on the core file is always:
	
	#0  0x00007f7ff6900610 in strcmp () from /usr/lib/libc.so.12
	#1  0x0000000000416387 in find_nfs_srvr ()
	#2  0x0000000000407fd0 in amfs_nfsl_ffserver ()
	#3  0x000000000040ff7c in locate_mntfs ()
	#4  0x000000000040fff9 in find_mntfs ()
	#5  0x0000000000406b50 in amfs_lookup_mntfs ()
	#6  0x0000000000406e52 in amfs_generic_lookup_child ()
	#7  0x0000000000411479 in nfsproc_lookup_2_svc ()
	#8  0x000000000041062b in nfs_program_2 ()
	#9  0x00007f7ff68c9401 in svc_getreq_common () from /usr/lib/libc.so.12
	#10 0x00007f7ff68c9444 in svc_getreqset () from /usr/lib/libc.so.12
	#11 0x0000000000410b59 in mount_automounter ()
	#12 0x000000000041ba85 in main ()

	The last thing amd syslogs prior to core dumping is something
	like:

Sep 24 23:44:27 paramount amd[282]: check_pmap_up: failed to contact portmapper on host "XXX": RPC: Timed out

    or:

Sep 25 06:17:24 homepages amd[282]: check_pmap_up: failed to contact portmapper on host "XXX": RPC: Timed out
Sep 25 06:17:24 homepages amd[282]: portmapper service not running on XXX
Sep 25 06:17:24 homepages amd[282]: NFS service not running on XXX

>How-To-Repeat:
	run amd, automount some nfs filesesytems, wait for some
	anomolous condition to occur :-(

>Fix:
	Don't know, clearly its not handling some error case.
	Some patch already in am-utils 6.2 may fix it.

>Unformatted: