We have too big problems with this scheduler bug.
It occurs on several Lenny Machines running as VM on ESX3.5U4
Installed Kernel Package is 2.6.26-19
The Machines are not crashing, but they tend to consume lots of cpu
resources until they are nearly unusable or affect other VMs running on
the ESX Host.
This is a "normal" log message from one Vm running a lot of cron jobs:
At the time of writing two cron processes each take 49,9% of cpu
regards,
Matthias
[1391701.476841] INFO: task cron:15861 blocked for more than 120 seconds.
[1391701.477846] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[1391701.479429] cron D 464a1a72 0 15861 2938
[1391701.479432] f2167a80 00000286 00000000 464a1a72 000434f2
f2167c0c c180bfa0 00000000
[1391701.479436] 00000000 c01dd0aa 0000084f 00000000 00002400
c01719a0 c011494a c0136114
[1391701.479440] 7fffffff 7fffffff d1d13f68 00000002 c02b89d1
c013458a 00000000 00000000
[1391701.479443] Call Trace:
[1391701.479463] [<c01dd0aa>] __next_cpu+0x12/0x21
[1391701.479520] [<c01719a0>] kmem_cache_alloc+0x50/0x84
[1391701.479525] [<c011494a>] read_real_cycles+0x8/0x9
[1391701.479529] [<c0136114>] getnstimeofday+0x37/0xbc
[1391701.479538] [<c02b89d1>] schedule_timeout+0x13/0x86
[1391701.479542] [<c013458a>] ktime_get_ts+0x22/0x49
[1391701.479547] [<c01345be>] ktime_get+0xd/0x21
[1391701.479552] [<c0119160>] hrtick_start_fair+0xeb/0x12c
[1391701.479561] [<c02b80f5>] wait_for_common+0xaf/0x10f
[1391701.479566] [<c011b6fc>] default_wake_function+0x0/0x8
[1391701.479572] [<c0121c0d>] do_fork+0x17f/0x1dc
[1391701.479581] [<c0102173>] sys_vfork+0x18/0x1c
[1391701.479587] [<c01038ce>] syscall_call+0x7/0xb
[1391701.479599] =======================
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