linux-kernel - kvm poweroff deadlock

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Message-ID: <c4e36d110901060713w28a6e3acq47e91ec53b4b6344@mail.gmail.com>
Date:	Tue, 6 Jan 2009 16:13:14 +0100
From:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
To:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Cc:	"Avi Kivity" <avi@...ranet.com>
Subject: kvm 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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