Date: Mon, 4 Nov 2024 08:05:13 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: FreeBSD Current <current@FreeBSD.org> Subject: userland is active during late shutdown or even panic? Message-ID: <297bdeca-ef39-4382-9e20-3ee1d0880bd8@FreeBSD.org>
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Has anyone here noticed weird behavior where userland on can be alive and well during quite late shutdown phases? First, I noticed this report on FreeBSD forums. Initially, I didn't find it believable, but the poster provided quite strong evidence and details. https://forums.freebsd.org/threads/zombie-kernel-reporting-its-own-crash-via-network.95217/ Then recently, I first hand experienced a similar thing during a normal reboot of a system. Here is console output from an ssh session connected to a host name 'ryth': ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 29759/usr/home/avg pts/1:[0]:ryth#18:28>poweroff ; exit Shutdown NOW! poweroff: [pid 14930] *** FINAL System shutdown message from root@ryth *** System going down IMMEDIATELY System shutdown time has arrived [root shell exited, but user shell is still active on ryth] 28923/usr/home/avg pts/1:[0]:ryth-18:28>tail -30 /var/log/messages [snip] Nov 3 18:28:25 ryth shutdown[14930]: power-down by root: Nov 3 18:28:25 ryth ntpd[2088]: ntpd exiting on signal 15 (Terminated) Nov 3 18:28:25 ryth upsmon[1989]: upsmon parent: read Nov 3 18:28:25 ryth kernel: . Nov 3 18:28:26 ryth kernel: , 1739. Nov 3 18:28:26 ryth kernel: Waiting (max 60 seconds) for system process `vnlru' to stop... done Nov 3 18:28:26 ryth kernel: Waiting (max 60 seconds) for system process `syncer' to stop... Nov 3 18:28:26 ryth kernel: Syncing disks, vnodes remaining... 0 Nov 3 18:28:27 ryth kernel: 0 28924/usr/home/avg pts/1:[0]:ryth-18:28> [finally ssh (slogin) gets disconnected] Connection to 192.168.0.77 closed by remote host. Connection to 192.168.0.77 closed. zsh: exit 255 slogin ryth ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ It was a weird feeling seeing "Syncing disks, vnodes remaining..." in messages. -- Andriy Gapon
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