[Bug 1922976] [NEW] iscsid fails to log out from target on shutdown

[Michael Brown]

Public bug reported:

When using an iSCSI root filesystem, the /usr/share/finalrd/open-
iscsi.finalrd script runs an instance of iscsid, waits for iscsid to
find the existing logged-in sessions, and then logs out from the iSCSI
target.

This currently fails because iscsid happens to call getpwuid() on UID 0.
Within the finalrd there are no libnss_*.so libraries and no /etc/passwd
file, so the getpwuid() call returns NULL.  This causes iscsid to report
an error "peeruser_unix: unknown local user with uid 0", and prevents
iscsid from recovering the existent session.  The end result is that the
open-iscsi.finalrd script waits for its maximum 30 seconds and then
fails to log out from the iSCSI target.

The error message is most easily observed by modifying
/usr/share/finalrd/open-iscsi.finalrd to run iscsid as "iscsid -f -d 8".

An example of a minimal workaround may be seen at
https://github.com/ipxe/sanbootable/commit/30bc58ce013a4db6b6d3480e42d4dc42d927fc5f

(Ubuntu 20.04)

** Affects: open-iscsi (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1922976

Title:
  iscsid fails to log out from target on shutdown

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  When using an iSCSI root filesystem, the /usr/share/finalrd/open-
  iscsi.finalrd script runs an instance of iscsid, waits for iscsid to
  find the existing logged-in sessions, and then logs out from the iSCSI
  target.

  This currently fails because iscsid happens to call getpwuid() on UID
  0.  Within the finalrd there are no libnss_*.so libraries and no
  /etc/passwd file, so the getpwuid() call returns NULL.  This causes
  iscsid to report an error "peeruser_unix: unknown local user with uid
  0", and prevents iscsid from recovering the existent session.  The end
  result is that the open-iscsi.finalrd script waits for its maximum 30
  seconds and then fails to log out from the iSCSI target.

  The error message is most easily observed by modifying
  /usr/share/finalrd/open-iscsi.finalrd to run iscsid as "iscsid -f -d
  8".

  An example of a minimal workaround may be seen at
  https://github.com/ipxe/sanbootable/commit/30bc58ce013a4db6b6d3480e42d4dc42d927fc5f

  (Ubuntu 20.04)

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