[Xen-devel] restoring domU: BUG: recent printk recursion!

[Andreas Florath <xen@xxxxxxxxxxxx>]

Hello!

In CS 20100:280fff79f737 the 01_restore_basic_pos does not work any more.
(Updated from CS 20070:8b0f1f37e145 where it worked - but IMHO it might
be a problem with the kernel.)
The test case does a 'save' and then a 'restore' of a minimal system.
After restoring the guest system, the attached output is printed over and
over to the console.

Environment:
o i686 xen-unstable CS 20100:280fff79f737
o linux-2.6-pvops.git commit 52535f45a5b1c9ee813cef76931cc68885088cbe
  Merge: 384a55c... f47b70c...
  Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
  Date:   Thu Jun 25 17:11:50 2009 -0700
o Debian 5.0

Any ideas? Any info missing?

Kind regards

Andreas

------
[   52.514441]  [<c170db8a>] xen_start_kernel+0x57a/0x582
[   52.514441] BUG: recent printk recursion!
[   52.514441] ---[ end trace b1d6a2897b1f9605 ]---
[   52.750023] BUG: recent printk recursion!
[   52.750023] ------------[ cut here ]------------
[   52.750023] BUG: recent printk recursion!
[   52.750023] WARNING: at  
/data/xu-xm-test-restore-01/linux-2.6-pvops.git/arch/x86/xen/time.c:180  
xen_sched_clock+0x31/0x62()
[   52.750023] BUG: recent printk recursion!
[   52.750023] Modules linked in:<2>BUG: recent printk recursion!
[   52.750023]
[   52.750023] BUG: recent printk recursion!
[   52.750023] Pid: 0, comm: swapper Tainted: G        W  2.6.30-rc3-tip #1
[   52.750023] BUG: recent printk recursion!
[   52.750023] Call Trace:
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1050e2d>] warn_slowpath+0x71/0xa0
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1003236>] ? init_post+0x11c/0x142
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1050e52>] ? warn_slowpath+0x96/0xa0
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1023627>] ? xen_clocksource_read+0x1a/0x1c
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c10236c8>] ? xen_vcpuop_set_next_event+0x55/0x6a
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c103d4d2>] ? pvclock_clocksource_read+0x48/0xa3
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c103d4d2>] ? pvclock_clocksource_read+0x48/0xa3
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c103d4d2>] ? pvclock_clocksource_read+0x48/0xa3
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1023718>] xen_sched_clock+0x31/0x62
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c102a505>] sched_clock+0x15/0x18
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1066028>] sched_clock_cpu+0x96/0x312
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1068fa8>] ? getnstimeofday+0x54/0xd7
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1064d9f>] ? ktime_get_ts+0x40/0x44
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1064db6>] ? ktime_get+0x13/0x2f
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c10662e0>] sched_clock_idle_sleep_event+0xe/0x10
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c106cd78>] tick_nohz_stop_sched_tick+0x89/0x302
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c11d78f2>] ? unmask_evtchn+0x1d/0xa1
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c10237b4>] ? check_events+0x8/0xc
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c10555d1>] irq_exit+0x5a/0x5c
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c11d7e2d>] xen_evtchn_do_upcall+0x123/0x134
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c1026767>] xen_do_upcall+0x7/0xc
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c10600d8>] ? rcu_migrate_callback+0x3/0x2a
[   52.750023] BUG: recent printk recursion!
[   52.750023] BUG: recent printk recursion!
[   52.750023]  [<c10023a7>] ? _stext+0x3a7/0x1005
[   52.7500[   52.791633] BUG: recent printk recursion!
[   52.791633] ------------[ cut here ]------------
[   52.791633] BUG: recent printk recursion!
[   52.791633] WARNING: at  
/data/xu-xm-test-restore-01/linux-2.6-pvops.git/arch/x86/xen/time.c:180  
xen_sched_clock+0x31/0x62()
[   52.791633] BUG: recent printk recursion!
[   52.791633] Modules linked in:<2>BUG: recent printk recursion!
[   52.791633]
[   52.791633] BUG: recent printk recursion!
[   52.791633] Pid: 0, comm: swapper Tainted: G        W  2.6.30-rc3-tip #1
[   52.791633] BUG: recent printk recursion!
[   52.791633] Call Trace:
[   52.791633] BUG: recent printk recursion!
[   52.791633] BUG: recent printk recursion!
[   52.791633]  [<c1050e2d>] warn_slowpath+0x71/0xa0
[   52.791633] BUG: recent printk recursion!
[   52.791633] BUG: recent printk recursion!
[   52.791633]  [<c1003236>] ? init_post+0x11c/0x142
[   52.791633] BUG: recent printk recursion!
[   52.791633] BUG: recent printk recursion!
[   52.791633]  [<c10285fd>] ? show_trace+0x10/0x14


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