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Subjectkvm poweroff deadlock
Hi

While testing latest 2.6.29-rc inside qemu-kvm guest I've got this
deadlock while executing poweroff:

sd 0:0:0:0: [sda] Stopping disk

ACPI: Preparing to enter system sleep state S5

Disabling non-boot CPUs ...

BUG: spinlock lockup on CPU#0, halt/2389, ffff88001dc0c3c0

Pid: 2389, comm: halt Not tainted 2.6.28 #103

Call Trace:

[<ffffffff803aa3f8>] _raw_spin_lock+0x158/0x170

[<ffffffff80538924>] _spin_lock_irqsave+0x64/0x90

[<ffffffff80259268>] ? __queue_work+0x18/0x90

[<ffffffff80259268>] __queue_work+0x18/0x90

[<ffffffff8025936d>] queue_work_on+0x4d/0x60

[<ffffffff80286ca7>] __stop_machine+0xe7/0x140

[<ffffffff80523930>] _cpu_down+0x120/0x2f0

[<ffffffff802469da>] disable_nonboot_cpus+0x8a/0x120

[<ffffffff802571d1>] kernel_power_off+0x21/0x50

[<ffffffff802574b0>] sys_reboot+0x110/0x230

[<ffffffff8023c11f>] ? finish_task_switch+0x5f/0x120

[<ffffffff8023c0c0>] ? finish_task_switch+0x0/0x120

[<ffffffff8053540b>] ? thread_return+0x3d/0x702

[<ffffffff80254509>] ? sys_kill+0xd9/0x200

[<ffffffff802544ad>] ? sys_kill+0x7d/0x200

[<ffffffff805380dc>] ? lockdep_sys_exit_thunk+0x35/0x67

[<ffffffff80538066>] ? trace_hardirqs_on_thunk+0x3a/0x3f

[<ffffffff80231a48>] sysenter_dispatch+0x7/0x2c

[<ffffffff80538066>] ? trace_hardirqs_on_thunk+0x3a/0x3f



Zdenek


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