Continuous "BUG: soft lockup" messages with RHEL5 Xen kernel

Solution Unverified - Updated -

Issue

  • Every 5-10 minutes, the following message is logged: "kernel: BUG: soft lockup - CPU#XX stuck for YYs! [oracle:12345]" with Xen kernel.
BUG: soft lockup - CPU#13 stuck for 10s! [oracle:23852]
CPU 13:
Modules linked in: [...]
Pid: 23852, comm: oracle Not tainted 2.6.18-92.el5xen #1
RIP: e030:[<ffffffff80207905>]  [<ffffffff80207905>] unmap_vmas+0x714/0xbb8
[...]
Call Trace:
  [<ffffffff80207865>] unmap_vmas+0x674/0xbb8
  [<ffffffff8021304d>] unmap_region+0xb5/0x128
  [<ffffffff802121ff>] do_munmap+0x1fd/0x27a
  [<ffffffff80264347>] __down_write_nested+0x35/0x9a
  [<ffffffff803095c5>] sys_shmdt+0x5b/0x127
  [<ffffffff802602f1>] tracesys+0xa7/0xb2

Environment

  • Red Hat Enterprise Linux 5.2
  • kernel-2.6.18-92.el5xen

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