** Description changed:
+ [Impact]
+
+ * The finalrd hook [1] of openiscsi runs iscsid which wants to
+ check for users [2] of its IPC peers. That fails for issues
+ with nss in that environment.
+
+ * The changes prep nss (libs) and if necesary fake a trivial
+ /etc/passwd so that the code runs as expected
+
+ * This avoids a delay or hang when running that code
+
+ [1]:
https://git.launchpad.net/ubuntu/+source/open-iscsi/tree/debian/open-iscsi.finalrd?h=ubuntu/hirsute-devel
+ [2]:
https://git.launchpad.net/ubuntu/+source/open-iscsi/tree/usr/mgmt_ipc.c?h=ubuntu/hirsute-devel#n371
+
+ [Test Plan]
+
+ * Set up iscsi root and then shut-down the system
+ * Check for errors or delay on the final cleanup which is here
+ this code runs.
+
+ [Where problems could occur]
+
+ * Since the only thin the update touches is the finalrd hook
+ there are two places to look out for
+ a) finalrd generation which means look for finalrd.service
+ b) shutdown of a system (as this is when systemd-shutdown pivots into
+ this environment)
+
+ [Other Info]
+
+ * nss is in use very indirectly here from getpwuid in glibc via nssswicth
+ config into the default value "file" to the lib
+ * if unaware it might be worth to have a look at finalrd itself
+ http://manpages.ubuntu.com/manpages/focal/man1/finalrd.1.html
+
+
+ --- original report ---
+
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)
** Changed in: open-iscsi (Ubuntu Focal)
Status: New => Triaged
** Changed in: open-iscsi (Ubuntu Groovy)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1922976
Title:
iscsid fails to log out from target on shutdown
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