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kern/45718: processes sometimes get stuck and spin in vm_map
>Synopsis: processes sometimes get stuck and spin in vm_map
>Arrival-Date: Sat Dec 17 05:25:00 +0000 2011
>Originator: Taylor R Campbell <campbell+netbsd%mumble.net@localhost>
>Release: NetBSD 5.99.58
System: NetBSD oberon.local 5.99.58 NetBSD 5.99.58 (RIAMONOHACK) #4: Sat Dec 10
23:18:29 UTC 2011
Over the past six to eight months (maybe longer), I've
occasionally noticed that after a lot of heavy file system
activity, some processes seem to get stuck. They occupy some
CPU time, but spend most of their time in vm_map.
Tonight I tried to create a null mount, and mount_null got
stuck like this; ^C did nothing, and umount wedged too. A
little while later, mount_null seemed to get unstuck, but when
I tried again, it got stuck again. Now several processes,
including mount_null, zsh, and xargs, are stuck like this.
21204 root 117 0 2904K 728K vm_map/0 2:05 16.41% 16.41% mount_null
In the past, the only way I have recovered from this situation
is by rebooting.
Memory is not scarce; I have a good half a gigabyte of RAM
free, out of two gigabytes total, and plenty of swap handy.
I haven't observed a pattern to what processes get stuck like
this, although if there are file system mounts involved (which
there often are because I use null mounts all the time), and
any process is stuck trying to do something like `df -h /mnt',
then any other process will get stuck if it tries to handle
Not sure. Try a few concurrent rsyncs, cvs updates, finds,
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