On 02.04.2018 19:27, Mark Knight wrote: >> What does it show if you press "CTRL-T" to see a status of "hung" process? > > Typically CTRL-T shows [sysctl mem]. In some circumstances I can CTRL-C > (e.g. if su hangs), in others I cannot (e.g. with sudo). > >> Does it help if you comment out the line mentioning /dev/console in the >> /etc/syslog.conf >> and apply the change with killall -1 syslogd ? > > Doing that "killall -HUP syslogd" hangs with (sysctl mem) - as does > "service syslogd restart" but after a fresh reboot, no - removing that > line didn't help at all. Thanks for getting my hopes up :) > > Moving ~/myuser/.bashrc out of the way (it really doesn't contain much > apart from setting a bunch of aliases), allows me to login as myself, > but "sudo -u myuser -s" still hangs. > > I just got a truss output of "sudo -u myuser -s" per the file below, > perhaps that contains a clue? > > # sudo -u myuser -s >& sudo.truss.log > > http://www.knigma.org/scratch/sudo.truss.log > > Flipping back to a 10.3 kernel makes everything happy (just as well, as > the machine in question is my main router/firewall, so it's a right pain > when it's not working). > > Thanks in advance for any fresh ideas; I'm really not sure where to go > with this!
1. Make sure you have kernel dumps enabled. Verify that dump can be properly generated and saved after reboot using "sysctl debug.kdb.panic=1" (this produced a panic). You should have crashdump in /var/crash after reboot. 2. Rebuild kernel using new updated sources but this time add to its config file: options KDB # Enable kernel debugger support. options KDB_UNATTENDED options KDB_TRACE options DDB # Support DDB. options GDB # Support remote GDB. options INVARIANTS # Enable calls of extra sanity checking options INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS options WITNESS # Enable checks to detect deadlocks and cycles options WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed 3. Boot new kernel using nextboot(8) and see if it will crash instead of deadlock and if so, fill the PR to Bugzilla. _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
