[Xen-users] BUG: soft lockup detected on CPU#0

[Steven Timm <timm@xxxxxxxx>]

In the past few weeks I have been seeing the following
error message in my Dom0 several times a day.
It does not lead to the crash of anything.  A second server,
same hardware and identically configured, doesn't give this error.

This is Xen 3.1.0 as downloaded from the tarballs of xen.org
and running on top of RHEL 5.1.

BUG: soft lockup detected on CPU#0!

Call Trace:
 <IRQ> [<ffffffff80258269>] softlockup_tick+0xcc/0xde
 [<ffffffff8020e84d>] timer_interrupt+0x3a3/0x401
 [<ffffffff80258898>] handle_IRQ_event+0x4b/0x93
 [<ffffffff8025897e>] __do_IRQ+0x9e/0x100
 [<ffffffff8020cc97>] do_IRQ+0x63/0x71
 [<ffffffff8034b347>] evtchn_do_upcall+0xee/0x165
 [<ffffffff8020abca>] do_hypervisor_callback+0x1e/0x2c
 <EOI> [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff8034b258>] force_evtchn_callback+0xa/0xb
 [<ffffffff803f2272>] thread_return+0xdf/0x119
 [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff80228a25>] __cond_resched+0x1c/0x44
 [<ffffffff803f25df>] cond_resched+0x37/0x42
 [<ffffffff802343c4>] ksoftirqd+0x0/0xbf
 [<ffffffff80234432>] ksoftirqd+0x6e/0xbf
 [<ffffffff802422d7>] kthread+0xc8/0xf1
 [<ffffffff8020ae1c>] child_rip+0xa/0x12
 [<ffffffff8024220f>] kthread+0x0/0xf1
 [<ffffffff8020ae12>] child_rip+0x0/0x12

In addition I am also seeing the following on the serial console of the 
machine (not at the same time):
<Jan/16 05:01 am>(XEN) mm.c:612:d1 Non-privileged (1) attempt to map I/O 
space 0
Any idea where this is coming from and how to fix it, would be helpful.

Steve Timm



--
------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.

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