lsof on CoreOS does not support -M

[fahlmant]

While using Mayday, I noticed the lsof output was empty. I tried the command listed in mayday_commands for myself, and it looks like -M is not supported for the lsof on CoreOS machines. Output from lsof -b -M -n -l on the CoreOS machine, which is what mayday runs:

core@ip-10-0-14-207 /tmp/201707051651.319096864 $ sudo lsof -b -M -n -l 
lsof: illegal option character: M

Output from lsof -h on a CoreOS machine that's part of my kubernetes cluster, where -M is not listed:

core@ip-10-0-14-207 /tmp/201707051651.319096864/mayday_commands $ lsof -h          
lsof 4.89
 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
 latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
 latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
 usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-E] [+|-e s] [+|-f[gG]]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [-o [o]] [-p s]
 [+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]
Defaults in parentheses; comma-separated set (s) items; dash-separated ranges.
  -?|-h list help          -a AND selections (OR)     -b avoid kernel blocks
  -c c  cmd c ^c /c/[bix]  +c w  COMMAND width (9)    +d s  dir s files
  -d s  select by FD set   +D D  dir D tree *SLOW?*   +|-e s  exempt s *RISKY*
  -i select IPv[46] files  -K list tasKs (threads)    -l list UID numbers
  -n no host names         -N select NFS files        -o list file offset
  -O no overhead *RISKY*   -P no port names           -R list paRent PID
  -s list file size        -t terse listing           -T disable TCP/TPI info
  -U select Unix socket    -v list version info       -V verbose search
  +|-w  Warnings (+)       -X skip TCP&UDP* files     -- end option scan
  -E display endpoint info              +E display endpoint info and files
  +f|-f  +filesystem or -file names     +|-f[gG] flaGs 
  -F [f] select fields; -F? for help  
  +|-L [l] list (+) suppress (-) link counts < l (0 = all; default = 0)
                                        +m [m] use|create mount supplement
                                        -o o   o 0t offset digits (8)
  -p s   exclude(^)|select PIDs         -S [t] t second stat timeout (15)
  -T qs TCP/TPI Q,St (s) info
  -g [s] exclude(^)|select and print process group IDs
  -i i   select by IPv[46] address: [46][proto][@host|addr][:svc_list|port_list]
  +|-r [t[m<fmt>]] repeat every t seconds (15);  + until no files, - forever.
       An optional suffix to t is m<fmt>; m must separate t from <fmt> and
      <fmt> is an strftime(3) format for the marker line.
  -s p:s  exclude(^)|select protocol (p = TCP|UDP) states by name(s).
  -u s   exclude(^)|select login|UID set s
  -x [fl] cross over +d|+D File systems or symbolic Links
  names  select named files or files on named file systems
Anyone can list all files; /dev warnings disabled; kernel ID check disabled.

And here is the output from my local laptop running Fedora 25, which does list -M:

$ lsof -h
lsof 4.89
 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
 latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
 latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
 usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-E] [+|-e s] [+|-f[gG]]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s]
 [+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [-Z [Z]] [--] [names]
Defaults in parentheses; comma-separated set (s) items; dash-separated ranges.
  -?|-h list help          -a AND selections (OR)     -b avoid kernel blocks
  -c c  cmd c ^c /c/[bix]  +c w  COMMAND width (9)    +d s  dir s files
  -d s  select by FD set   +D D  dir D tree *SLOW?*   +|-e s  exempt s *RISKY*
  -i select IPv[46] files  -K list tasKs (threads)    -l list UID numbers
  -n no host names         -N select NFS files        -o list file offset
  -O no overhead *RISKY*   -P no port names           -R list paRent PID
  -s list file size        -t terse listing           -T disable TCP/TPI info
  -U select Unix socket    -v list version info       -V verbose search
  +|-w  Warnings (+)       -X skip TCP&UDP* files     -Z Z  context [Z]
  -- end option scan     
  -E display endpoint info              +E display endpoint info and files
  +f|-f  +filesystem or -file names     +|-f[gG] flaGs 
  -F [f] select fields; -F? for help  
  +|-L [l] list (+) suppress (-) link counts < l (0 = all; default = 0)
                                        +m [m] use|create mount supplement
  +|-M   portMap registration (-)       -o o   o 0t offset digits (8)
  -p s   exclude(^)|select PIDs         -S [t] t second stat timeout (15)
  -T qs TCP/TPI Q,St (s) info
  -g [s] exclude(^)|select and print process group IDs
  -i i   select by IPv[46] address: [46][proto][@host|addr][:svc_list|port_list]
  +|-r [t[m<fmt>]] repeat every t seconds (15);  + until no files, - forever.
       An optional suffix to t is m<fmt>; m must separate t from <fmt> and
      <fmt> is an strftime(3) format for the marker line.
  -s p:s  exclude(^)|select protocol (p = TCP|UDP) states by name(s).
  -u s   exclude(^)|select login|UID set s
  -x [fl] cross over +d|+D File systems or symbolic Links
  names  select named files or files on named file systems
Anyone can list all files; /dev warnings disabled; kernel ID check disabled.

[bgilbert]

What version of Container Linux are you using? lsof -M should be enabled starting in 1451.2.0.

[fahlmant]

@bgilbert Ah there's the issue.

$ cat /etc/*-release
DISTRIB_ID="Container Linux by CoreOS"
DISTRIB_RELEASE=1409.5.0

This is the version that was installed by tectonic since it's stable.

[bgilbert]

That fix should be in the next major Container Linux stable release.

lsof defaults to -M, so in principle that flag could be dropped from Mayday, but it seems safer to leave it in place.