Date: Sun, 07 Jan 2018 18:27:32 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: =?UTF-8?B?W0J1ZyAyMjQ5NzVdIHNodXRkb3duKDgpIG5lZWRzIHRvIHdhaXQg?= =?UTF-8?B?bG9uZ2VyIGZvciBzd2Fwb2ZmIHRvIGF2b2lkIGEg4oCcQ2Fubm90IGFsbG9j?= =?UTF-8?B?YXRlIG1lbW9yeeKAnSBlcnJvcg==?= Message-ID: <bug-224975-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224975 Bug ID: 224975 Summary: shutdown(8) needs to wait longer for swapoff to avoid a “Cannot allocate memory” error Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: wosch@FreeBSD.org While analysing the bug #224479 I noticed that `shutdown -r now’ runs to fast and failed to swapoff a swap device or swap file. I see on the console the error message: swapoff: /dev/md99: Cannot allocate memory and soon later a kernel panic. Not good. This happens when more swap space is in use than free memory is available. E.g. you have 2.5GB swap space, 69MB are in use and only 49MB Free memory is available (according to the top(1) command). How to repeat: # start some processes, which need a little bit more RAM than available for i in $(seq 1 20);do perl -e '$a=`man tcsh`; for(0..100) { $b.=$a}; sleep 100' & done top(1) reports: Mem: 611M Active, 51M Inact, 112M Laundry, 142M Wired, 103M Buf, 49M Free Swap: 2500M Total, 69M Used, 2431M Free, 2% Inuse # now reboot with shutdown $ shutdown -r now you will see the “swapoff: /dev/md99: Cannot allocate memory” error message because 49M Free Mem is < than 69M used swap. followed by a kernel swap_pager I/O error message In case of low memory I think that shutdown/reboot needs to wait a little bit (3..10 seconds) after we kill the processes. Then there will be enough free memory available, and the swapoff call will run successfully. -- You are receiving this mail because: You are the assignee for the bug.
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