Panic at shutdown in x86-64 3.7 kernel under qemu 1.3.0?

[Rob Landley]

Reasonably vanilla versions of both just did this. No idea why. Just  
did it the once, haven't gotten it to reproduce...

Rob

Restarting system.
reboot: machine restart
general protection fault: fff2 [#1]
CPU 0
Pid: 8542, comm: oneit Not tainted 3.7.0 #1 Bochs Bochs
RIP: 0010:[<ffffffff81013bec>]  [<ffffffff81013bec>]  
lapic_shutdown+0x29/0x2b
RSP: 0018:ffff88000fb57e28  EFLAGS: 00000202
RAX: ffffffff8130e2d0 RBX: 0000000000000202 RCX: 0000000000000000
RDX: ffffffff81322a40 RSI: 00000000000000ff RDI: 00000000000000f0
RBP: 0000000028121969 R08: ffff88000fb57fd8 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81015721 R12: 00000000fee1dead
R13: 0000000000000000 R14: 0000000000000004 R15: 0000000000425e02
FS:  0000000000000000(0000) GS:ffffffff81304000(0000)  
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000440f11 CR3: 000000000fb53000 CR4: 00000000000006b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000
Process oneit (pid: 8542, threadinfo ffff88000fb56000, task  
ffff88000e848f90)
Stack:
 0000000001234567 ffffffff810136cb 0000000028121969 ffffffff810136a8
 0000000001234567 ffffffff8102b451 0000000000000011 0000000000040001
 0000000000000023 0000000000000000 0000000000000006 00000001802a0027
Call Trace:
 [<ffffffff810136cb>] ? native_machine_shutdown+0x9/0x1e
 [<ffffffff810136a8>] ? native_machine_restart+0x20/0x29
 [<ffffffff8102b451>] ? sys_reboot+0x11f/0x14a
 [<ffffffff81029368>] ? __kill_pgrp_info+0x37/0x5f
 [<ffffffff81022622>] ? do_exit+0x61f/0x623
 [<ffffffff81037ce5>] ? schedule_tail+0x20/0x46
 [<ffffffff8122233f>] ? ret_from_fork+0xf/0xb0
 [<ffffffff81222450>] ? system_call_fastpath+0x16/0x1b
Code: c8 c3 48 8b 05 8a cc 31 00 53 f6 c4 02 75 12 83 3d c9 da 38 00 00  
74 13 83 3d d8 ea 38 00 00 75 0a 9c 5b fa e8 3a ff ff ff 53 9d <5b> c3  
48 83 ec 08 eb 02 f3 90 48 8b 05 eb db 31 00 bf 00 03 00
RIP  [<ffffffff81013bec>] lapic_shutdown+0x29/0x2b
 RSP <ffff88000fb57e28>
---[ end trace 0c69c9c16377bd9d ]-----
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