linux-kernel - Lockdep warning with init_espfix

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Date:	Thu, 09 Oct 2014 11:35:38 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-kernel@...r.kernel.org
CC:	x86@...nel.org
Subject: Lockdep warning with init_espfix_ap()


Non-fatal warning seen with latest kernel tree during kernel boot.

 WARNING: CPU: 64 PID: 0 at kernel/locking/lockdep.c:2744
lockdep_trace_alloc+0xdd/0xe0()
 DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))
 Modules linked in:

 CPU: 64 PID: 0 Comm: swapper/64 Not tainted 3.17.0+ #10
 Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS
BIVTSDP1.86B.0049.R00.1403081207 03/08/2014
  0000000000000000 d27b9ea0e3821f35 ffff88084edc3ce0 ffffffff8171cbd8
  ffff88084edc3d28 ffff88084edc3d18 ffffffff8108424d 0000000000000046
  0000000000000000 00000000000000d0 0000000000000002 0000000000000000
 Call Trace:
  [<ffffffff8171cbd8>] dump_stack+0x4d/0x66
  [<ffffffff8108424d>] warn_slowpath_common+0x7d/0xa0
  [<ffffffff810842cc>] warn_slowpath_fmt+0x5c/0x80
  [<ffffffff810e3e2d>] lockdep_trace_alloc+0xdd/0xe0
  [<ffffffff811c0aaf>] __alloc_pages_nodemask+0x9f/0x4b0
  [<ffffffff81025365>] ? native_sched_clock+0x35/0xa0
  [<ffffffff810253d9>] ? sched_clock+0x9/0x10
  [<ffffffff8120981a>] alloc_page_interleave+0x3a/0x90
  [<ffffffff8120ae8d>] alloc_pages_current+0x17d/0x1f0
  [<ffffffff811bab24>] ? __get_free_pages+0x14/0x50
  [<ffffffff811bab24>] __get_free_pages+0x14/0x50
  [<ffffffff8102225d>] init_espfix_ap+0x17d/0x320
  [<ffffffff8105254e>] start_secondary+0x19e/0x350
 ---[ end trace 2b62d796aa7ae001 ]---

 Debugging ... but sorta hoping someone else may have already seen it ;)

 P.
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