Processes getting wedged in "U" (uninterruptible wait) state after Security Update 2020-003
earle at isolar.DynDNS.ORG
Thu May 28 23:25:23 UTC 2020
Kind of a long shot here, but given the level of Mac expertise on this
At work I have a production Mac mini running macOS Mojave 10.14.6. It
ran perfectly fine - with several MacPorts ports in regular use - until
I made the mistake of installing Security Update 2020-003.
After the reboot I started noticing things going haywire quickly.
- Servers that were running but not listening on their usual ports (or
- Servers that were running normally but could not be killed (not even
- Processes (including MacPorts apps) that get wedged as soon as they
The common thread through all these is that the processes - whether you
tried to kill them or run them from scratch - all get wedged in "U"
(uninterruptible wait) state. (Nothing is NFS or CIFS mounted so I
doubt it's due to disk I/O.)
A COTS product we have uses Postgres as the back-end database; the
Postgres server starts at boot time, but it doesn't bind to its normal
listening port. If I try to kill the process, it wedges - just like
these other ones do.
If I try to run MacPorts' "htop" port ("/opt/local/bin/htop") - it
immediately wedges. I can't even run it under "dtruss" - I get no
output at all, like as if it never even gets off the ground to run.
(Strangely, the normal system "top" runs fine and doesn't wedge - it
also shows these processes as being in "stuck" state, as expected.)
If I try to restart MacPorts' Xymon monitoring port (which has several
persistent processes started at boot time), one of them, "xymonlaunch",
won't quit and it gets wedged in "U" state.
I was able to use "gcore" to get a core dump of one of the wedged
processes, but when I tried to use the MacPorts "gdb"
(/opt/local/bin/ggdb) to examine it, you guessed it ... instantly
In fact, pretty much EVERYTHING in the MacPorts "/opt/local/bin"
directory is wedging on me at startup! I'm completely baffled at this
Tried running the MacPorts "tree" and "openssl" next. Stuck.
The list of wedged processes is getting impressive:
whdmac:~ root# top -l 1 | egrep STATE\|stuck | sed -e
's/stuck.*/stuck/g' -e 's/STATE.*/STATE/g' -e 's/ //g'
Processes: 152 total, 2 running, 5 stuck
PID COMMAND %CPU TIME #TH #WQ #PORTS MEM PURG CMPRS PGRP PPID
993 openssl 0.0 00:00.00 1 0 0 8192B+ 0B 0B 993 1
973 tree 0.0 00:00.00 1 0 0 8192B+ 0B 0B 973 445
956 htop 0.0 00:00.00 1 0 0 8192B+ 0B 0B 956 1
261 xymonlaunch 0.0 00:00.00 1 0 0 8192B+ 0B 0B 246 246
100 dbus-daemon 0.0 00:00.00 1 0 0 8192B+ 0B 0B 100 1
I'm resigned to probably having to boot it into Recovery Mode and
restore the system from a pre-Security Update 2020-003 Time Machine
backup, but I thought I'd run it up the flagpole here first just to see
if I was the only person in the world experiencing this. Maybe this Mac
is possessed ...
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