well, I did made a -dbgsym package... and caught the same symptomatic error, now, "... segfault at 0 ip 00007f5ac1e570f4 sp 00007ffea6a75848 error 4 in libc-2.27.so[7f5ac1d22000+1b1000] ..."
and found it ememnates in "... find_nfs_srvr (mf=0x557ff0586020) at ../../amd/srvr_nfs.c:961 ..." aye, this "... &nfs_srvr_list ... " must have references to stale objects related to the fact my RPC is timing out bad... ? tbc. please note, I could not stop myself modifing the darn am-utils-6.2 master baseline https://salsa.debian.org/debian/am-utils.git, and in the process with a few changes related to the yalm wrapper flex/bison scanners made thread safe, and gave setuid(), getuid() a more POSIX implementations ... but those seem unrelated as the core "should" be identical... anyway this is my prerogative since not being a deb-guy! Program received signal SIGSEGV, Segmentation fault. __strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:572 572 ../sysdeps/x86_64/multiarch/../strcmp.S: No such file or directory. (gdb) bt #0 __strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:572 #1 0x0000557ff02d0ebe in find_nfs_srvr (mf=0x557ff0586020) at ../../amd/srvr_nfs.c:961 #2 0x0000557ff02c70c1 in init_mntfs (remopts=0x557ff0560980 "rw", mopts=0x557ff0560a60 "rw", auto_opts=0x557ff0576220 "fs:=${autodir}/${rhost}/root/${rfs}", info=0x557ff05612a0 "rotan:/", mp=0x557ff0560ca0 "/amd/rotan/root", mo=0x557ff0575ab0, ops=0x557ff04efa00 <amfs_host_ops>, mf=0x557ff0586020) at ../../amd/mntfs.c:98 #3 alloc_mntfs (ops=0x557ff04efa00 <amfs_host_ops>, ops@entry=0x557ff0575ab0, mo=mo@entry=0x557ff0575ab0, mp=0x557ff0560ca0 "/amd/rotan/root", info=0x557ff05612a0 "rotan:/", auto_opts=auto_opts@entry=0x557ff0576220 "fs:=${autodir}/${rhost}/root/${rfs}", mopts=0x557ff0560a60 "rw", remopts=0x557ff0560980 "rw") at ../../amd/mntfs.c:109 #4 0x0000557ff02c7514 in find_mntfs (ops=0x557ff0575ab0, mo=mo@entry=0x557ff0575ab0, mp=<optimized out>, info=<optimized out>, auto_opts=auto_opts@entry=0x557ff0576220 "fs:=${autodir}/${rhost}/root/${rfs}", mopts=<optimized out>, remopts=<optimized out>) at ../../amd/mntfs.c:207 #5 0x0000557ff02bd0aa in amfs_lookup_one_location (new_mp=0x557ff0573c00, new_mp=0x557ff0573c00, mf=0x557ff0576cb0, mf=0x557ff0576cb0, pfname=0x557ff0560d60 "rotan", def_opts=0x557ff0576220 "fs:=${autodir}/${rhost}/root/${rfs}", ivec=0x557ff05763c0 "rhost:=${key};type:=host;rfs:=/") at ../../amd/amfs_generic.c:301 #6 amfs_lookup_loc (new_mp=new_mp@entry=0x557ff0573c00, error_return=error_return@entry=0x7ffd8cc54ee4) at ../../amd/amfs_generic.c:477 #7 0x0000557ff02bd5b1 in amfs_generic_lookup_child (mp=0x557ff056c320, fname=<optimized out>, error_return=0x7ffd8cc54ee4, op=1) at ../../amd/amfs_generic.c:1183 #8 0x0000557ff02c9e0b in nfsproc_lookup_2_svc (argp=argp@entry=0x7ffd8cc54f10, rqstp=rqstp@entry=0x7ffd8cc54fb0) at ../../amd/nfs_subr.c:233 #9 0x0000557ff02c7af8 in nfs_program_2 (rqstp=0x7ffd8cc54fb0, transp=0x557ff0588b90) at ../../amd/nfs_prot_svc.c:293 #10 0x00007f7d23c22a11 in __GI_svc_getreq_common (fd=fd@entry=9) at svc.c:525 #11 0x00007f7d23c22a71 in __GI_svc_getreqset (readfds=readfds@entry=0x7ffd8cc556e0) at svc.c:430 #12 0x0000557ff02c85ec in run_rpc () at ../../amd/nfs_start.c:289 #13 mount_automounter (ppid=<optimized out>) at ../../amd/nfs_start.c:452 #14 0x0000557ff02b7e54 in main (argc=<optimized out>, argv=<optimized out>) at ../../amd/amd.c:561 ( ... 25/04/2018 07:44 kaolo amd[27726] find_nfs_srvr: force NFS version to 3 25/04/2018 07:44 kaolo amd[27726] check_pmap_up: failed to contact portmapper on host "rotan.ptizoom.co.uk": RPC: Timed out 25/04/2018 07:44 kaolo amd[27726] portmapper service not running on rotan.ptizoom.co.uk 25/04/2018 07:44 kaolo amd[27726] NFS service not running on rotan.ptizoom.co.uk 25/04/2018 07:44 kaolo amd[27726] rotan:/homes/roland restarted fstype nfs on /homes/roland, flags 0x9 25/04/2018 07:44 kaolo amd[27726] /usr/share/am-utils/amd.net referenced fstype toplvl on /net 25/04/2018 07:44 kaolo amd[27726] /net set to never timeout 25/04/2018 07:44 kaolo amd[27726] amd.home referenced fstype toplvl on /home 25/04/2018 07:44 kaolo amd[27726] /home set to never timeout 25/04/2018 07:44 kaolo amd[27726] file server rotan.ptizoom.co.uk, type nfs, state starts down 25/04/2018 07:44 kaolo amd[27726] No fs type specified (key = "/defaults", map = ""root"") 25/04/2018 07:44 kaolo amd[27726] find_nfs_srvr: force NFS version to 3 25/04/2018 07:44 kaolo amd[27726] fileserver rotan.ptizoom.co.uk is already hung - not running NFS proto/version discovery 25/04/2018 07:44 kaolo amd[27726] /etc/am-utils/amd.homes referenced fstype toplvl on /homes/kaolo 25/04/2018 07:44 kaolo amd[27726] /homes/kaolo set to never timeout 25/04/2018 07:44 kaolo amd[27726] file server rotan.ptizoom.co.uk, type nfs, state is up 25/04/2018 07:44 kaolo amd[27726] recompute_portmap: NFS version 3 on rotan.ptizoom.co.uk 25/04/2018 07:44 kaolo amd[27726] Using MOUNT version: 3 25/04/2018 07:44 kaolo amd[27726] nis_isup: NIS came back up for map amd.home 25/04/2018 07:44 kaolo amd[27726] amfs_nfsl: "rotan" is not the local host "kaolo", or "kaolo.unknown.domain" using type:=nfs 25/04/2018 07:44 kaolo amd[27726] amfs_nfsl: "/homes/christian" exists, using type:=link 25/04/2018 07:44 kaolo amd[27726] ./homes/christian mounted fstype nfsl on ./homes/christian 25/04/2018 07:44 kaolo amd[27726] /home/christian set to timeout in 300 seconds 25/04/2018 07:44 kaolo amd[27726] "/net/rotan" on //nil// timed out (flags 0x20) 25/04/2018 07:44 kaolo amd[27726] recompute_portmap: NFS version 3 on rotan.ptizoom.co.uk 25/04/2018 07:44 kaolo amd[27726] Using MOUNT version: 3 25/04/2018 07:45 kaolo amd[27726] recompute_portmap: NFS version 3 on rotan.ptizoom.co.uk 25/04/2018 07:45 kaolo amd[27726] Using MOUNT version: 3 25/04/2018 07:45 kaolo amd[27726] No fs type specified (key = "/defaults", map = ""root"") 25/04/2018 07:45 kaolo amd[27726] find_nfs_srvr: force NFS version to 3 25/04/2018 07:45 kaolo amd[27726] check_pmap_up: failed to contact portmapper on host "rotan.ptizoom.co.uk": RPC: Timed out 25/04/2018 07:45 kaolo amd[27726] portmapper service not running on rotan.ptizoom.co.uk 25/04/2018 07:45 kaolo amd[27726] NFS service not running on rotan.ptizoom.co.uk XXX 25/04/2018 07:45 nfs server kaolo not responding, still trying 25/04/2018 07:52 nfs server kaolo OK 25/04/2018 07:52 nfs server kaolo OK 25/04/2018 07:52 amd[30377] segfault at 0 ip 00007f5ac1e570f4 sp 00007ffea6a75848 error 4 in libc-2.27.so[7f5ac1d22000+1b1000] 25/04/2018 07:53 nfs server kaolo not responding, still trying 25/04/2018 07:54 nfs server kaolo OK 25/04/2018 07:54 nfs server kaolo OK xxx ( those were my build package settings: all:DEB_BUILD_OPTIONS=debug all:DEB_BUILD_MAINT_OPTIONS=qa=+bug,+canary all:; cd /usr/src/am-utils; dpkg-buildpackage -b -uc ) -- -------------------------------------------------------
