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[Xen-devel] Soft lockup/Time went backwards in latest unstable



I'm running Xen on a Lenovo Thinkpad T60p, based on an Intel Core Duo T2500 processor. Since upgrading to the latest unstable, the console is filled with "Time went backwards" messages. An example:

Timer ISR/1: Time went backwards: delta=-52249969 delta_cpu=67750031 shadow=197099583154 off=168169166 processed=197320000000 cpu_processed=197200000000
0: 197310000000
1: 197200000000
Timer ISR/1: Time went backwards: delta=-76271442 delta_cpu=73728558 shadow=197099583154 off=224147323 processed=197400000000 cpu_processed=197250000000
0: 197390000000
1: 197250000000
Timer ISR/1: Time went backwards: delta=-90285138 delta_cpu=69714862 shadow=197099583154 off=280133627 processed=197470000000 cpu_processed=197310000000
0: 197460000000
1: 197310000000

In addition, I noticed a soft lockup, with the following stack trace:

BUG: soft lockup detected on CPU#0!
[<c014ef57>] softlockup_tick+0x97/0xd0
[<c01097ea>] timer_interrupt+0x2fa/0x6b0
[<ee06a875>] sd_rw_intr+0x75/0x2e0 [sd_mod]
[<c014f2c3>] handle_IRQ_event+0x33/0xa0
[<c014f3d8>] __do_IRQ+0xa8/0x120
[<c010733f>] do_IRQ+0x3f/0xa0
[<c0244b4e>] evtchn_do_upcall+0xbe/0x100
[<c010580d>] hypervisor_callback+0x3d/0x48
[<c020007b>] cfb_imageblit+0x10b/0x530
[<c0243f5a>] force_evtchn_callback+0xa/0x10
[<ee07c63f>] acpi_processor_idle+0x26d/0x422 [processor]
[<ee07c3d2>] acpi_processor_idle+0x0/0x422 [processor]
[<c01035a1>] cpu_idle+0x71/0xd0
[<c03b482d>] start_kernel+0x39d/0x480
[<c03b4220>] unknown_bootoption+0x0/0x270

and

BUG: soft lockup detected on CPU#1!
[<c014ef57>] softlockup_tick+0x97/0xd0
[<c01097ea>] timer_interrupt+0x2fa/0x6b0
[<c014f2c3>] handle_IRQ_event+0x33/0xa0
[<c014f3d8>] __do_IRQ+0xa8/0x120
[<c010733f>] do_IRQ+0x3f/0xa0
[<c0107344>] do_IRQ+0x44/0xa0
[<c0244b4e>] evtchn_do_upcall+0xbe/0x100
[<c010580d>] hypervisor_callback+0x3d/0x48
[<c0243f5a>] force_evtchn_callback+0xa/0x10
[<ee07c63f>] acpi_processor_idle+0x26d/0x422 [processor]
[<ee07c3d2>] acpi_processor_idle+0x0/0x422 [processor]
[<c01035a1>] cpu_idle+0x71/0xd0

It appears that this issue was introduced in Xen 3.0.4, as this exhibits the same issue. 3.0.3 works fine. The version of unstable that I was using previously (which did not have this issue) worked with kernel version 2.6.16.29; 3.0.4 comes with 2.6.16.33. Could the problem have been introduced in the move from 2.6.16.29 to 2.6.16.33 (or somewhere in between)?

I'm not sure how to go about handling this apparent bug, though I am prepared to offer any assistance necessary in fixing it. I've attached my xm dmesg, in case that's any help.

Thanks in advance.

Regards,

Derek Murray.

Attachment: xen_dmesg
Description: Binary data

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