[2.6.28.1] INFO: task cron:4841 blocked for more than 120 seconds

[Folkert van Heusden]

Hi,

Since 2.6.26 my system (quadcore intel core 2 system) and definately
also with 2.6.28.1 crashes after a few days of uptime. Well, crashes:
it becomes unresponsive (can't log in with ssh and creating new imap
sessions etc also fails) but still forwards network traffic.
The netconsole gets filled with these messages:

[42265.700129] INFO: task cron:4841 blocked for more than 120 seconds.
[42265.700139] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[42265.700142] cron          D ffff88002802e700     0  4841   5367
[42265.700148]  ffff880065101dd8 0000000000000082 ffff880065101e8c
0000000000000292
[42265.700159]  ffff88009a990ab0 ffffffff80550340 ffff88009a990d28
0000000000000000
[42265.700168]  0000000000000296 ffff88012bc059c0 00000000000000d0
0000000000004111
[42265.700176] Call Trace:
[42265.700184]  [<ffffffff80464cb0>] schedule_timeout+0x1e/0xad
[42265.700188]  [<ffffffff8046427f>] wait_for_common+0xc4/0x13d
[42265.700194]  [<ffffffff8023a6fc>] default_wake_function+0x0/0xe
[42265.700199]  [<ffffffff80241632>] do_fork+0x21e/0x285
[42265.700202]  [<ffffffff80210dba>] system_call_fastpath+0x16/0x1b
[42265.700206]  [<ffffffff80211247>] ptregscall_common+0x67/0xb0

[42265.700331] INFO: task cron:4845 blocked for more than 120 seconds.
[42265.700333] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[42265.700335] cron          D ffff88002802e700     0  4845   5367
[42265.700340]  ffff88008c407dd8 0000000000000082 ffff88008c407e8c
0000000000000292
[42265.700349]  ffff88009e14a100 ffffffff80550340 ffff88009e14a378
0000000000000000
[42265.700357]  ffffffff80465fb7 ffffffff802c073f 0000000800000001
ffff88009e14a100
[42265.700365] Call Trace:
[42265.700368]  [<ffffffff80465fb7>] _spin_lock+0x5/0x7
[42265.700373]  [<ffffffff802c073f>] dup_fd+0x216/0x2bf
[42265.700378]  [<ffffffff80464cb0>] schedule_timeout+0x1e/0xad
[42265.700381]  [<ffffffff8046427f>] wait_for_common+0xc4/0x13d
[42265.700384]  [<ffffffff8023a6fc>] default_wake_function+0x0/0xe
[42265.700388]  [<ffffffff80241632>] do_fork+0x21e/0x285
[42265.700391]  [<ffffffff80210dba>] system_call_fastpath+0x16/0x1b
[42265.700395]  [<ffffffff80211247>] ptregscall_common+0x67/0xb0

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