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=3D224975 Bug ID: 224975 Summary: shutdown(8) needs to wait longer for swapoff to avoid a =E2=80=9CCannot allocate memory=E2=80=9D 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=E2=80=99 ru= ns 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=3D`man tcsh`; for(0..100) { $b.=3D$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 =E2=80=9Cswapoff: /dev/md99: Cannot allocate memory=E2=80= =9D 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 b= it (3..10 seconds) after we kill the processes. Then there will be enough free memory available, and the swapoff call will run successfully. --=20 You are receiving this mail because: You are the assignee for the bug.=
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