lockdep BUG: warning (2.6.18-rc1, TP T60)

[Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>]

I'm trying 2.6.18-rc1 on a Thinkpad T60 (dual-core T2400, SATA hard
drive) running Ubuntu 6.06.  The kernel is SMP and PREEMPT and has
many lock validation options turned on.  During boot the lockdep
checker reports good news:

[   20.936404] Good, all 218 testcases passed! |

When I pressed Fn-F4 (for suspend-to-ram), it began to suspend,
blanked the screen, and then came back right away to the X session.  I
don't think it ever made it into suspend mode (I've reported the
suspend problem to linux-acpi).  And this lockdep warning showed up:

[  459.756000] BUG: warning at kernel/lockdep.c:1799/trace_hardirqs_on()
[  459.756000]  [<c0105aeb>] show_trace+0x1b/0x20
[  459.756000]  [<c0105b14>] dump_stack+0x24/0x30
[  459.756000]  [<c013c186>] trace_hardirqs_on+0x166/0x180
[  459.756000]  [<c010522d>] do_general_protection+0xcd/0x220
[  459.756000]  [<c0103e01>] error_code+0x39/0x40

-Sanjoy

`Never underestimate the evil of which men of power are capable.'
         --Bertrand Russell, _War Crimes in Vietnam_, chapter 1.
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