Just today I noticed that PostgreSQL was no longer responding to
requests (although it was marked as listening on its port), so I
killed it off.
Immediately, these errors were logged, at a sufficiently high log
level to hit the console as well as the kernel log:
Aug 7 21:35:24 loki kernel: space map null (entry 00005800)
Aug 7 21:35:24 loki kernel: space map null (entry 00005800)
Aug 7 21:35:24 loki kernel: swap_free: swap-space map null (entry 00005900)
Aug 7 21:35:24 loki kernel: swap_free: swap-space map null (entry 00005900)
Aug 7 21:35:24 loki kernel: swap_free: swap-space map null (entry 00005a00)
Aug 7 21:35:24 loki kernel: swap_free: swap-space map null (entry 00005a00)
Aug 7 21:35:24 loki kernel: swap_free: swap-space map null (entry 00005b00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005b00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005c00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005c00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005d00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005d00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005e00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005e00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005f00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00005f00)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00006000)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00006000)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00006100)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00006100)
Aug 7 21:35:25 loki kernel: swap_free: swap-space map null (entry 00006200)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006200)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006300)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006300)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006400)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006400)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006500)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006500)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006600)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006600)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006700)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006700)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006800)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006800)
Aug 7 21:35:26 loki kernel: swap_free: swap-space map null (entry 00006900)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006900)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006a00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006a00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006b00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006b00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006c00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006c00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006d00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006d00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006e00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006e00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006f00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00006f00)
Aug 7 21:35:27 loki kernel: swap_free: swap-space map null (entry 00007000)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007000)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007100)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007100)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007200)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007200)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007300)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007300)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007400)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007400)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007500)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007500)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007600)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007600)
Aug 7 21:35:28 loki kernel: swap_free: swap-space map null (entry 00007700)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007700)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007800)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007800)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007900)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007900)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007a00)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007a00)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007b00)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007b00)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007c00)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007c00)
Aug 7 21:35:29 loki kernel: swap_free: swap-space map null (entry 00007d00)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00007d00)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00007e00)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00007e00)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00007f00)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00007f00)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008000)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008000)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008100)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008100)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008200)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008200)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008300)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008300)
Aug 7 21:35:30 loki kernel: swap_free: swap-space map null (entry 00008400)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008400)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008500)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008500)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008600)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008600)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008700)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008700)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008800)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008800)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008900)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008900)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008a00)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008a00)
Aug 7 21:35:31 loki kernel: swap_free: swap-space map null (entry 00008b00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008b00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008c00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008c00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008d00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008d00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008e00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008e00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008f00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00008f00)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00009000)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00009000)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00009100)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00009100)
Aug 7 21:35:32 loki kernel: swap_free: swap-space map null (entry 00009200)
Aug 7 21:35:33 loki kernel: swap_free: swap-space map null (entry 00009200)
Oddly, it appears that the first two entries here were corrupted in
some way, as the only occurrence of the string `space map null' in the
kernel is in the swap_free() error reported below.
loki has 128Mb of RAM, and before PostgreSQL crashed, 128Kb was
reported as being swapped out by /proc/meminfo. Afterwards, none was.
I've never seen anything like this error before; does anyone know what
may be going on? I fear there isn't anything like enough info
available to allow replication, but this could be useful; I've not
seen it reported to linux-kernel before now.
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