Hypothesis,
Test (2) - The error is propagated to upper layers after X seconds.
In this case I'm testing:
$ sudo iscsiadm -m node -o show | grep node.session.timeo.replac
node.session.timeo.replacement_timeout = 60
node.session.timeo.replacement_timeout = 60
And same "locking" behavior is observed, but for a certain period of
time. Now, shutdown procedure stayed locked for exact 60 seconds before
allowing the machine to shutdown. This means that the systemd logic
NEEDS either a clear shutdown, for the _netdev filesystems, OR the error
to be propagated so the umount() can go on:
[ 17.612020] connection1:0: ping timeout of 5 secs expired, recv timeout 5,
last rx 4294894197, last ping 4294895448, now 4294896700
[ 17.644128] connection2:0: ping timeout of 5 secs expired, recv timeout 5,
last rx 4294894204, last ping 4294895456, now 4294896708
<60 seconds>
[ 78.044264] sd 2:0:0:1: rejecting I/O to offline device
[ 78.045297] blk_update_request: I/O error, dev sdb, sector 0
[ 78.046315] sd 3:0:0:1: rejecting I/O to offline device
[ 78.046357] sd 2:0:0:1: rejecting I/O to offline device
[ 78.046363] blk_update_request: I/O error, dev sdb, sector 0
[ 78.046487] sd 2:0:0:1: rejecting I/O to offline device
[ 78.050117] blk_update_request: I/O error, dev sda, sector 20481074
[ 78.051219] XFS (sda1): metadata I/O error: block 0x1387c32 ("xlog_iodone")
error 5 numblks 64
[ 78.052727] XFS (sda1): Log I/O Error Detected. Shutting down filesystem
[ 78.053901] XFS (sda1): Please umount the filesystem and rectify the
problem(s)
[ 78.060723] sd 3:0:0:1: rejecting I/O to offline device
[ 78.061759] blk_update_request: I/O error, dev sda, sector 0
<error was propagated>
<filesystems can proceed with umount>
[ OK ] Unmounted /ext4.
[ OK ] Unmounted /xfs.
[ OK ] Stopped File System Check on /dev/disk/by-label/XFS.
[ OK ] Stopped File System Check on /dev/disk/by-label/EXT4.
[ OK ] Removed slice system-systemd\x2dfsck.slice.
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https://bugs.launchpad.net/bugs/1569925
Title:
Shutdown hang on 16.04 with iscsi targets
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