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[Xerxes Rånby <xerxes@xxxxxxxxx>]

Hi James, are you able to reproduce this bug from inside a oneiric
chroot while running a Natty kernel?

Do Jenkins need to run any specific task to trigger the bug?

Which ARM hardware + hardware revision and kernel version  are you
using?

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https://bugs.launchpad.net/bugs/845158

Title:
  Frequent java task hang on ARM server

Status in “openjdk-6” package in Ubuntu:
  New

Bug description:
  I'm using an up-to-date oneiric ARM server image running jenkins -
  after a short period of time (< 1 hour) the server locks up - hard
  reboot and I can see these messages in the syslog:

  Sep  8 21:50:51 winehouse kernel: [ 7920.496795] INFO: task java:20973 blocked for more than 120 seconds.
  Sep  8 21:50:51 winehouse kernel: [ 7920.496795] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Sep  8 21:50:51 winehouse kernel: [ 7920.497009] java            D c05ca9e0     0 20973    561 0x00000000
  Sep  8 21:50:51 winehouse kernel: [ 7920.497222] [<c05ca9e0>] (schedule+0x540/0x618) from [<c05cc728>] (__down_read+0xc0/0xd8)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497222] [<c05cc728>] (__down_read+0xc0/0xd8) from [<c05cf5e8>] (do_page_fault.part.2+0x80/0x1e0)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497222] [<c05cf5e8>] (do_page_fault.part.2+0x80/0x1e0) from [<c05cf7e4>] (do_page_fault+0x9c/0xac)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497222] [<c05cf7e4>] (do_page_fault+0x9c/0xac) from [<c004c410>] (do_DataAbort+0x34/0x98)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497406] [<c004c410>] (do_DataAbort+0x34/0x98) from [<c05cd210>] (__dabt_svc+0x70/0xa0)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497436] Exception stack(0xec91dec0 to 0xec91df08)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497467] dec0: 56e0f000 56e12000 00000020 0000001f ef248040 56e110c0 56e0f44c ef248000
  Sep  8 21:50:51 winehouse kernel: [ 7920.497467] dee0: 00000000 ec91c000 00000000 56b4446c 56e11000 ec91df08 c00553d4 c005d198
  Sep  8 21:50:51 winehouse kernel: [ 7920.497497] df00: 800f0013 ffffffff
  Sep  8 21:50:51 winehouse kernel: [ 7920.497497] [<c05cd210>] (__dabt_svc+0x70/0xa0) from [<c005d198>] (v7_coherent_kern_range+0x1c/0x7c)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497497] [<c005d198>] (v7_coherent_kern_range+0x1c/0x7c) from [<c00553d4>] (arm_syscall+0x140/0x294)
  Sep  8 21:50:51 winehouse kernel: [ 7920.497497] [<c00553d4>] (arm_syscall+0x140/0x294) from [<c0051220>] (ret_fast_syscall+0x0/0x30)

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