Date: Thu, 30 Mar 2017 12:23:49 +0300 From: Andrey Chernov <ache@freebsd.org> To: Bruce Evans <brde@optusnet.com.au> Cc: "Ngie Cooper (yaneurabeya)" <yaneurabeya@gmail.com>, bde@freebsd.org, current@freebsd.org Subject: Re: New syscons bugs: shutdown -r doesn't execute rc.d sequence and others Message-ID: <4085b441-74ee-796f-adc0-713dfc198b03@freebsd.org> In-Reply-To: <20170330183716.W1655@besplex.bde.org> References: <7d5bbbf0-6908-185c-2ee0-29e0a4f60591@freebsd.org> <D9EAB41D-CE19-4225-8868-F4AFE461F903@gmail.com> <5587c798-d36c-9074-1060-30e206db5571@freebsd.org> <69af07a7-ec8f-9b7f-8b93-9ba148f30fec@freebsd.org> <8C24D1BA-1607-4C19-BA38-39256E82C7AF@gmail.com> <51045bee-a626-efb3-4b1e-0c3d36abb1ab@freebsd.org> <20170329132927.U882@besplex.bde.org> <f35b6ae1-c668-0649-e327-f57811b1d71a@freebsd.org> <20170330150449.R1061@besplex.bde.org> <3534bbeb-9f73-4e37-8f89-c05dd9f89f8c@freebsd.org> <20170330183716.W1655@besplex.bde.org>
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> We don't understand the bug yet. It might not even be in sc. Do you only > see problems for shutdown? The shutdown environment is special for > locking. Yes, only for reboot/shutdown. The system does not do anythings wrong even under high load. On reboot or hang those lines are never printed: kernel: Waiting (max 60 seconds) for system process `vnlru' to stop...done kernel: Waiting (max 60 seconds) for system process `bufdaemon' to stop...done kernel: Waiting (max 60 seconds) for system process `syncer' to stop... kernel: Syncing disks, vnodes remaining...5 3 0 1 0 0 done kernel: All buffers synced. (it is from 10-stable sample, old -current samples are lost) Moreover, GELI swap deactivation lines are never printed too (I already mention that I change swap to normal, but nothing is changed). > A hang in sc means that deadlock occurred and sc's new deadlock detection > didn't work. Hangs are rare. Most common are premature reboots. > Check that ddb works before shutdown, or just put a lot of printfs in I can't check it ddb because I can't enter ddb in sc mode, as I already write, nothing happens. Only vt mode allows Ctrl-Alt-ESC, but the bug does not exist in vt mode, so it is pointless. >>> You might have entered ddb in a context which used to race or deadlock. >> >> No. I try about 20 times on machine which does nothing and can't enter >> KDB in sc only mode, but got one dead hang instead, when start to repeat >> it too fast. > > Even earlier than shutdown, and when booting? I mean in normal operation mode after booting, earlier than shutdown. Shutdown with premature reboot is too fast to press anything at the right time. I don't try to enter ddb when booting yet, but tell you results later. > I call this line-drawing characters for cp437, and use them occasionally, > but I don't know the termcap method for using them very well. See ac, as, ae.
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