freebsd-current

> On May 27, 2009, at 09:31 AM, Kip Macy wrote:
> > Can you try not setting the ARC?
> > I haven't had any problems on my comparably sized VMs.
> >
> > -Kip

(Sorry if the quoting got FUBAR.)
I tried this "once" more, with 1GB VM RAM, no ARC settings and a 4GB  
swap for dumps. (Apparently, when I had 640MB VM RAM, the dump created  
was ~1150 MB. I figured it couldn't exceed RAM size.)
Between the previous tests and this, I had loads of crashes (with  
640MB), even so bad that I couldn't boot because savecore would cause  
a panic. I increased VM RAM and set arc_max in the loader and it  
booted fine. Then, I tried (see below) with 1GB VM RAM and again no  
ARC settings.

The wired count grew and grew and grew, until it crashed in  
lzjb_decompress(), backtrace:
lzjb_decompress()
zio_decompress()
zio_done()
zio_execute()
zio_done()
zio_execute()
taskq_thread()
fork_exit()
fork_trampoline()

On "call doadump" I got "Fatal double fault", no dump, and a reboot.

Here's a LONG output of some vmstat output while running buildworld - 
j4. Note how the wired count keeps increasing and increasing until it  
breaks (in part, I guess this is intended, but it seems to grow a tad  
out of hand):

Regards,
Thomas

------ NO arc settings below! ------

[EMAIL PROTECTED] ~]$ while :; do date; echo; vmstat -s | grep -E 'pages  
(cached|active|wired down|free$)'; echo; sleep 20; done
Wed May 27 13:54:50 CEST 2009

    15716 pages cached
    41358 pages active
    63244 pages wired down
   141368 pages free

Wed May 27 13:55:10 CEST 2009

    15719 pages cached
    65571 pages active
    65515 pages wired down
   113358 pages free

Wed May 27 13:55:30 CEST 2009

    15719 pages cached
    41471 pages active
    70436 pages wired down
   132093 pages free

Wed May 27 13:55:50 CEST 2009

    15809 pages cached
    11660 pages active
    81518 pages wired down
   153294 pages free

Wed May 27 13:56:10 CEST 2009

    16124 pages cached
    11013 pages active
    87862 pages wired down
   147672 pages free

Wed May 27 13:56:30 CEST 2009

    16124 pages cached
    10917 pages active
    93383 pages wired down
   142488 pages free

Wed May 27 13:56:50 CEST 2009

    16144 pages cached
    10920 pages active
    98399 pages wired down
   137634 pages free

Wed May 27 13:57:11 CEST 2009

    16144 pages cached
     8810 pages active
    99766 pages wired down
   138416 pages free

Wed May 27 13:57:31 CEST 2009

    16871 pages cached
    10552 pages active
   101513 pages wired down
   134928 pages free

Wed May 27 13:57:51 CEST 2009

    16883 pages cached
    11496 pages active
   104379 pages wired down
   131244 pages free

Wed May 27 13:58:11 CEST 2009

    16883 pages cached
    12916 pages active
   106040 pages wired down
   128168 pages free

Wed May 27 13:58:31 CEST 2009

    16893 pages cached
    16027 pages active
   106888 pages wired down
   124227 pages free

Wed May 27 13:58:51 CEST 2009

    16896 pages cached
    13662 pages active
   107314 pages wired down
   126197 pages free

Wed May 27 13:59:11 CEST 2009

    16896 pages cached
    14783 pages active
   107870 pages wired down
   124567 pages free

Wed May 27 13:59:31 CEST 2009

    16896 pages cached
    14129 pages active
   108229 pages wired down
   124904 pages free

Wed May 27 13:59:51 CEST 2009

    16896 pages cached
    13691 pages active
   108613 pages wired down
   124973 pages free

Wed May 27 14:00:12 CEST 2009

    16908 pages cached
    21888 pages active
   109317 pages wired down
   116102 pages free

Wed May 27 14:00:32 CEST 2009

    16908 pages cached
    16624 pages active
   109980 pages wired down
   120739 pages free

Wed May 27 14:00:52 CEST 2009

    16908 pages cached
    15138 pages active
   110250 pages wired down
   121978 pages free

Wed May 27 14:01:12 CEST 2009

    17916 pages cached
    15184 pages active
   117746 pages wired down
   114193 pages free

Wed May 27 14:01:32 CEST 2009

    17916 pages cached
    15698 pages active
   118926 pages wired down
   112573 pages free

Wed May 27 14:01:52 CEST 2009

    17916 pages cached
    25922 pages active
   119319 pages wired down
   101966 pages free

Wed May 27 14:02:12 CEST 2009

    17916 pages cached
    20539 pages active
   120071 pages wired down
   106607 pages free

Wed May 27 14:02:32 CEST 2009

    17937 pages cached
    25740 pages active
   120564 pages wired down
   100913 pages free

Wed May 27 14:02:52 CEST 2009

    18074 pages cached
    25516 pages active
   121315 pages wired down
   100338 pages free

Wed May 27 14:03:12 CEST 2009

    18094 pages cached
    19031 pages active
   122122 pages wired down
   106028 pages free

Wed May 27 14:03:33 CEST 2009

    18103 pages cached
    23648 pages active
   122723 pages wired down
   100812 pages free

Wed May 27 14:03:53 CEST 2009

    18103 pages cached
    29860 pages active
   122962 pages wired down
    94362 pages free

Wed May 27 14:04:13 CEST 2009

    18217 pages cached
    38628 pages active
   123589 pages wired down
    84918 pages free

Wed May 27 14:04:33 CEST 2009

    18248 pages cached
    18009 pages active
   124198 pages wired down
   104942 pages free

Wed May 27 14:04:53 CEST 2009

    18483 pages cached
    19225 pages active
   125757 pages wired down
   102082 pages free

Wed May 27 14:05:13 CEST 2009

    18505 pages cached
    18979 pages active
   127236 pages wired down
   100840 pages free

Wed May 27 14:05:33 CEST 2009

    18505 pages cached
    19717 pages active
   127714 pages wired down
    99636 pages free

Wed May 27 14:05:53 CEST 2009

    18521 pages cached
    21331 pages active
   127996 pages wired down
    97737 pages free

Wed May 27 14:06:13 CEST 2009

    18543 pages cached
    23642 pages active
   128571 pages wired down
    94845 pages free

Wed May 27 14:06:33 CEST 2009

    18543 pages cached
    20029 pages active
   128781 pages wired down
    98252 pages free

Wed May 27 14:06:54 CEST 2009

    18603 pages cached
    18498 pages active
   129496 pages wired down
    99034 pages free

Wed May 27 14:07:14 CEST 2009

    18603 pages cached
    24398 pages active
   130137 pages wired down
    92504 pages free

Wed May 27 14:07:34 CEST 2009

    18603 pages cached
    21363 pages active
   130230 pages wired down
    95456 pages free

Wed May 27 14:07:54 CEST 2009

    18603 pages cached
    23774 pages active
   130705 pages wired down
    92540 pages free

Wed May 27 14:08:14 CEST 2009

    18765 pages cached
    21217 pages active
   131884 pages wired down
    93881 pages free

Wed May 27 14:08:34 CEST 2009

    19064 pages cached
    17613 pages active
   133762 pages wired down
    95531 pages free

Wed May 27 14:08:54 CEST 2009

    19098 pages cached
    15597 pages active
   135458 pages wired down
    95850 pages free

Wed May 27 14:09:14 CEST 2009

    19103 pages cached
    16082 pages active
   136499 pages wired down
    94357 pages free

Wed May 27 14:09:34 CEST 2009

    19107 pages cached
    15857 pages active
   137281 pages wired down
    93802 pages free

Wed May 27 14:09:55 CEST 2009

    19107 pages cached
    19354 pages active
   137997 pages wired down
    89561 pages free

Wed May 27 14:10:15 CEST 2009

    19136 pages cached
    21803 pages active
   138690 pages wired down
    86447 pages free

Wed May 27 14:10:35 CEST 2009

    19136 pages cached
    19315 pages active
   138979 pages wired down
    88638 pages free

Wed May 27 14:10:55 CEST 2009

    19136 pages cached
    18570 pages active
   139205 pages wired down
    89174 pages free

Wed May 27 14:11:15 CEST 2009

    19136 pages cached
    19063 pages active
   139547 pages wired down
    88260 pages free

Wed May 27 14:11:35 CEST 2009

    19136 pages cached
    26933 pages active
   140081 pages wired down
    79856 pages free

Wed May 27 14:11:55 CEST 2009

    19136 pages cached
    18519 pages active
   140270 pages wired down
    88076 pages free

Wed May 27 14:12:15 CEST 2009

    19136 pages cached
    21957 pages active
   140658 pages wired down
    84248 pages free

Wed May 27 14:12:35 CEST 2009

    19136 pages cached
    23497 pages active
   140910 pages wired down
    82457 pages free

Wed May 27 14:12:55 CEST 2009

    19815 pages cached
    19513 pages active
   144502 pages wired down
    82584 pages free

Wed May 27 14:13:16 CEST 2009

    19815 pages cached
    21738 pages active
   144881 pages wired down
    79980 pages free

Wed May 27 14:13:36 CEST 2009

    19815 pages cached
    24656 pages active
   145071 pages wired down
    76873 pages free

Wed May 27 14:13:56 CEST 2009

    19986 pages cached
    21395 pages active
   145581 pages wired down
    79589 pages free

Wed May 27 14:14:16 CEST 2009

    20022 pages cached
    22892 pages active
   146716 pages wired down
    76952 pages free

Wed May 27 14:14:36 CEST 2009

    20171 pages cached
    17546 pages active
   147771 pages wired down
    81149 pages free

Wed May 27 14:14:56 CEST 2009

    20171 pages cached
    17878 pages active
   150482 pages wired down
    78143 pages free

Wed May 27 14:15:16 CEST 2009

    20260 pages cached
    23596 pages active
   152448 pages wired down
    70429 pages free

Wed May 27 14:15:36 CEST 2009

    20332 pages cached
    21442 pages active
   153011 pages wired down
    72026 pages free

Wed May 27 14:15:56 CEST 2009

    20374 pages cached
    23005 pages active
   153651 pages wired down
    69810 pages free

Wed May 27 14:16:17 CEST 2009

    20374 pages cached
    20770 pages active
   154539 pages wired down
    71153 pages free

Wed May 27 14:16:37 CEST 2009

    20463 pages cached
    25142 pages active
   155789 pages wired down
    65500 pages free

Wed May 27 14:16:57 CEST 2009

    20477 pages cached
    32484 pages active
   156992 pages wired down
    56957 pages free

Wed May 27 14:17:17 CEST 2009

    20526 pages cached
    26033 pages active
   157863 pages wired down
    62507 pages free

Wed May 27 14:17:37 CEST 2009

    20867 pages cached
    20120 pages active
   158864 pages wired down
    67325 pages free

Wed May 27 14:17:57 CEST 2009

    20880 pages cached
    19925 pages active
   160153 pages wired down
    66229 pages free

Wed May 27 14:18:17 CEST 2009

    21075 pages cached
    27658 pages active
   162581 pages wired down
    56027 pages free

Wed May 27 14:18:37 CEST 2009

    21803 pages cached
    39186 pages active
   163758 pages wired down
    43310 pages free

Wed May 27 14:18:58 CEST 2009

    21810 pages cached
    32754 pages active
   163908 pages wired down
    49593 pages free

Wed May 27 14:19:18 CEST 2009

    21875 pages cached
    40620 pages active
   164575 pages wired down
    41036 pages free

Wed May 27 14:19:38 CEST 2009

    21895 pages cached
    43913 pages active
   165186 pages wired down
    37131 pages free

Wed May 27 14:19:58 CEST 2009

    21913 pages cached
    47805 pages active
   165486 pages wired down
    32943 pages free

Wed May 27 14:20:18 CEST 2009

    21916 pages cached
    80399 pages active
   140567 pages wired down
    23307 pages free

Wed May 27 14:20:38 CEST 2009

    21916 pages cached
    47934 pages active
   131067 pages wired down
    67480 pages free

Wed May 27 14:20:58 CEST 2009

    21916 pages cached
    48128 pages active
   131054 pages wired down
    67298 pages free

Wed May 27 14:21:18 CEST 2009

    21938 pages cached
    98297 pages active
   131522 pages wired down
    14753 pages free

Wed May 27 14:21:38 CEST 2009

    22570 pages cached
    17971 pages active
   124963 pages wired down
   102939 pages free

Wed May 27 14:21:58 CEST 2009

    22592 pages cached
    24054 pages active
   125193 pages wired down
    96565 pages free

Wed May 27 14:22:19 CEST 2009

    24154 pages cached
    26256 pages active
   125192 pages wired down
    93946 pages free

Wed May 27 14:22:39 CEST 2009

    24319 pages cached
    20557 pages active
   128251 pages wired down
    96539 pages free

Wed May 27 14:22:59 CEST 2009

    24493 pages cached
    31001 pages active
   129876 pages wired down
    84428 pages free

Wed May 27 14:23:19 CEST 2009

    24626 pages cached
    23256 pages active
   131449 pages wired down
    90535 pages free

Wed May 27 14:23:39 CEST 2009

    24676 pages cached
    44725 pages active
   132090 pages wired down
    68476 pages free

Wed May 27 14:23:59 CEST 2009

    24933 pages cached
    17247 pages active
   132609 pages wired down
    95307 pages free

Wed May 27 14:24:19 CEST 2009

    25180 pages cached
    19572 pages active
   133921 pages wired down
    91582 pages free

Wed May 27 14:24:39 CEST 2009

    25250 pages cached
    25916 pages active
   134800 pages wired down
    84329 pages free

Wed May 27 14:24:59 CEST 2009

    25346 pages cached
    23643 pages active
   135585 pages wired down
    85789 pages free

Wed May 27 14:25:19 CEST 2009

    25492 pages cached
    28457 pages active
   136531 pages wired down
    79961 pages free

Wed May 27 14:25:40 CEST 2009

    25492 pages cached
    46320 pages active
   137234 pages wired down
    61413 pages free

Wed May 27 14:26:00 CEST 2009

    25492 pages cached
    65175 pages active
   137752 pages wired down
    42052 pages free

Wed May 27 14:26:20 CEST 2009

    26698 pages cached
    26348 pages active
   139321 pages wired down
    78720 pages free

Wed May 27 14:26:40 CEST 2009

    26728 pages cached
    17654 pages active
   149770 pages wired down
    76992 pages free

Wed May 27 14:27:00 CEST 2009

    26728 pages cached
    19290 pages active
   151873 pages wired down
    73244 pages free

Wed May 27 14:27:20 CEST 2009

    26749 pages cached
    21063 pages active
   154681 pages wired down
    68635 pages free

Wed May 27 14:27:40 CEST 2009

    26750 pages cached
    20613 pages active
   157053 pages wired down
    66722 pages free

Wed May 27 14:28:00 CEST 2009

    26771 pages cached
    21762 pages active
   160131 pages wired down
    62504 pages free

Wed May 27 14:28:20 CEST 2009

    26777 pages cached
    21401 pages active
   165438 pages wired down
    57435 pages free

Wed May 27 14:28:41 CEST 2009

    26777 pages cached
    23093 pages active
   170737 pages wired down
    50589 pages free

******* CRASH *********

Sorry about the length.

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