Comment 65 for bug 1569925
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| Rafael David Tinoco (rafaeldtinoco) wrote | #65 |
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1b1ed1a
(Get the code!)
Hypothesis,
Test (1) - The error is NEVER propagated to upper layers:
# xfs and ext4 mounted automatically
inaddy@iscsihang:~$ mount | grep _netde
/dev/sda1 on /ext4 type ext4 (rw,relatime,
/dev/sdb1 on /xfs type xfs (rw,relatime,
# no error propagation
inaddy@iscsihang:~$ sudo iscsiadm -m node -o show | grep timeo.replace
node.session.
node.session.
# target server can't give any more packets to guest:
inaddy@machete:~$ sudo iptables -A INPUT -s 192.168.49.8 -p tcp --destination-port 3260 -j DROP
# reboot can't succeed
inaddy@iscsihang:~$ sudo reboot
[ 27.596135] connection2:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4294896692, last ping 4294897944, now 4294899196
[ 27.628109] connection1:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4294896700, last ping 4294897952, now 4294899204
Systemd hangs forever:
[ OK ] Stopped target Remote File Systems.
Unmounting /ext4...
Unmounting /xfs...
OBS: There is a tight relationship in between connection disappearing before the umount service runs and the capability of systemd to shutdown the machine entirely. I would say that, in case of no error propagation, is even worse since kernel would be locked up forever:
[ 240.132208] INFO: task systemd:1094 blocked for more than 120 seconds.
[ 240.133499] Not tainted 4.4.0-93-generic #116-Ubuntu
[ 240.134544] "echo 0 > /proc/sys/
[ 240.136092] INFO: task umount:1199 blocked for more than 120 seconds.
[ 240.137262] Not tainted 4.4.0-93-generic #116-Ubuntu
[ 240.138302] "echo 0 > /proc/sys/
[ 240.139742] INFO: task umount:1201 blocked for more than 120 seconds.
[ 240.140898] Not tainted 4.4.0-93-generic #116-Ubuntu
[ 240.141953] "echo 0 > /proc/sys/
Systemd is still trying...
[ OK ] Unmounted /ext4.
[ OK ] Unmounted /xfs.
[ OK ] Stopped File System Check on /dev/disk/
[ OK ] Stopped File System Check on /dev/disk/
[ OK ] Removed slice system-
[ OK ] Stopped target Remote File Systems (Pre).
Stopping Login to default iSCSI targets...
[ 360.140109] INFO: task systemd:1094 blocked for more than 120 seconds.
[ 360.141219] Not tainted 4.4.0-93-generic #116-Ubuntu
[ 360.142100] "echo 0 > /proc/sys/
[ 360.143377] INFO: task umount:1199 blocked for more than 120 seconds.
[ 360.144451] Not tainted 4.4.0-93-generic #116-Ubuntu
[ 360.145333] "echo 0 > /proc/sys/
[ 360.146576] INFO: task umount:1201 blocked for more than 120 seconds.
[ 360.147586] Not tainted 4.4.0-93-generic #116-Ubuntu
[ 360.148472] "echo 0 > /proc/sys/
This will happen forever. I still have to find a way of causing systemd to shutdown network and cause this hang because error, likely, is propagated after the umount service gives up its logic (or something like it) <-- theory.