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Subject: [Bug 199189] SWAP on ZFS can crash server
Date: Sun, 05 Apr 2015 22:32:38 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.1-STABLE
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Many People
X-Bugzilla-Who: vermaden@interia.pl
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199189

            Bug ID: 199189
           Summary: SWAP on ZFS can crash server
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: vermaden@interia.pl

Running swap on zvol is a bad idea, because it will eventually crash the server
when trashing happens.

You can simulate the trashing by running the following Perl script, it will
eventually fill up all your available memory.

===============================================================================
#!/usr/bin/perl
my $count=0;
my @data;
my $temp_data;
for(my $i=0;$i<10000000;$i++) {
        $temp_data.="1234567890abcdefghijklmnopqrstuvwxyz";
}

while(1) {
        $data[$count++]=$temp_data;
}
===============================================================================

Tested on FreeBSD 10.1 stable

With zvol swap - 8 GB RAM FreeBSD server will stall within 1 minutes.

without swap or dedicated swap disk/partition - server will automatically kill
that Perl process.

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