[Xen-users] Bunch of dump_stack()s for no apparent reason

[Phillip Susi <psusi@xxxxxxxxxx>]

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I found the following odd messages in a domU.  It looks like it isn't a BUG or 
OOPS, but
xen just called dump_stack for no apparent reason.  The message repeated a 
number of times.
Any ideas why?  At the time I think someone inadvertently rebooted the host so 
it tried to
save the domU to disk to be restored later.  I thought that was done without 
the knowledge
of the domU, so why was it freezing devices?

[333098.453847] PM: freeze of devices complete after 0.130 msecs
[333098.453851] suspending xenstore...
[333098.453913] PM: late freeze of devices complete after 0.058 msecs
[333098.453978] PM: noirq freeze of devices complete after 0.063 msecs
[333098.454089] ------------[ cut here ]------------
[333098.454103] WARNING: CPU: 0 PID: 9 at 
/build/buildd/linux-3.13.0/arch/x86/xen/enlighten.c:967 
xen_apic_write+0x17/0x20()
[333098.454106] Modules linked in: dm_snapshot ufs qnx4 hfsplus hfs minix ntfs 
msdos jfs xfs target_core_mod configfs ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad 
ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi intel_rapl 
x86_pkg_temp_thermal coretemp crc32_pclmul aesni_intel aes_i586 xts lrw 
gf128mul ablk_helper cryptd hwmon_vid lp parport dm_multipath scsi_dh btrfs 
libcrc32c raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor 
async_tx xor raid6_pq raid1 raid0 multipath linear nbd dm_mirror dm_region_hash 
dm_log
[333098.454172] CPU: 0 PID: 9 Comm: migration/0 Not tainted 3.13.0-29-generic 
#53-Ubuntu
[333098.454175]  00000000 00000000 eb8dfdc0 c164f613 00000000 eb8dfdf0 c10567ee 
c182ba80
[333098.454185]  00000000 00000009 c18204f4 000003c7 c1003077 c1003077 00000002 
00000000
[333098.454195]  ebab02cc eb8dfe00 c10568b2 00000009 00000000 eb8dfe08 c1003077 
eb8dfe14
[333098.454204] Call Trace:
[333098.454214]  [<c164f613>] dump_stack+0x41/0x52
[333098.454223]  [<c10567ee>] warn_slowpath_common+0x7e/0xa0
[333098.454229]  [<c1003077>] ? xen_apic_write+0x17/0x20
[333098.454234]  [<c1003077>] ? xen_apic_write+0x17/0x20
[333098.454240]  [<c10568b2>] warn_slowpath_null+0x22/0x30
[333098.454245]  [<c1003077>] xen_apic_write+0x17/0x20
[333098.454252]  [<c103a9a7>] clear_local_APIC+0x67/0x2d0
[333098.454258]  [<c103ac35>] disable_local_APIC+0x25/0x80
[333098.454264]  [<c103add9>] lapic_suspend+0x149/0x1a0
[333098.454271]  [<c140ad7a>] syscore_suspend+0x5a/0x160
[333098.454278]  [<c13b2235>] xen_suspend+0x25/0xb0
[333098.454285]  [<c10852ef>] ? sched_clock_cpu+0xdf/0x150
[333098.454292]  [<c10d2785>] multi_cpu_stop+0x95/0xb0
[333098.454298]  [<c10d26f0>] ? cpu_stop_should_run+0x40/0x40
[333098.454304]  [<c10d28db>] cpu_stopper_thread+0x6b/0x140
[333098.454311]  [<c100ed0a>] ? __switch_to+0x10a/0x340
[333098.454316]  [<c1080129>] ? finish_task_switch+0x49/0xe0
[333098.454323]  [<c1652d98>] ? __schedule+0x358/0x770
[333098.454330]  [<c165de47>] ? xen_do_upcall+0x7/0xc
[333098.454336]  [<c1001227>] ? xen_hypercall_xen_version+0x7/0x20
[333098.454343]  [<c10083cf>] ? xen_force_evtchn_callback+0xf/0x20
[333098.454348]  [<c1008c50>] ? check_events+0x8/0xc
[333098.454354]  [<c165637b>] ? _raw_spin_lock_irqsave+0x1b/0x60
[333098.454360]  [<c165617c>] ? _raw_spin_unlock_irqrestore+0x1c/0x40
[333098.454367]  [<c107bf1a>] smpboot_thread_fn+0xca/0x150
[333098.454373]  [<c107be50>] ? SyS_setgroups+0x130/0x130
[333098.454380]  [<c1074f41>] kthread+0xa1/0xc0
[333098.454385]  [<c1080606>] ? wake_up_nohz_cpu+0x56/0x60
[333098.454391]  [<c165d877>] ret_from_kernel_thread+0x1b/0x28
[333098.454397]  [<c1074ea0>] ? kthread_create_on_node+0x150/0x150
[333098.454402] ---[ end trace 758207473cd2b193 ]---
[333098.454405] ------------[ cut here ]------------
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