linux-kernel - 2.6.25.3 WARNING swapper Not tainted at kernel/lockdep.c

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Date:	Sun, 11 May 2008 11:30:20 +0200
From:	Pidoux <f6bvp@...e.fr>
To:	linux-kernel@...r.kernel.org, bpidoux@...e.fr
Subject: 2.6.25.3 WARNING swapper Not tainted at kernel/lockdep.c

I still observe the following warning when booting kernel 2.6.25.3 SMP.

Booting processor 1/2 APIC 0x1
Initializing CPU#1
Calibrating delay using timer specific routine.. 4388.98 BogoMIPS 
(lpj=8777969)
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 2048K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 1
CPU1: Thermal monitoring enabled (TM2)
Intel(R) Core(TM)2 Duo CPU     E4500  @ 2.20GHz stepping 0d
checking TSC synchronization [CPU#0 -> CPU#1]: passed.
Brought up 2 CPUs
------------[ cut here ]------------
WARNING: at kernel/lockdep.c:2662 check_flags+0x18d/0x190()
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.25.3-patched-ax25 #4

Call Trace:
  [<ffffffff8022fccf>] warn_on_slowpath+0x5f/0x80
  [<ffffffff80213a77>] ? native_sched_clock+0x57/0x80
  [<ffffffff8022acea>] ? hrtick_set+0x3a/0x120
  [<ffffffff80254eb5>] ? __lock_acquire+0x245/0x1070
  [<ffffffff8022ad6d>] ? hrtick_set+0xbd/0x120
  [<ffffffff80213a77>] ? native_sched_clock+0x57/0x80
  [<ffffffff8024b1c0>] ? __atomic_notifier_call_chain+0x0/0xa0
  [<ffffffff8025191d>] check_flags+0x18d/0x190
  [<ffffffff80255d43>] lock_acquire+0x63/0xd0
  [<ffffffff8024b211>] __atomic_notifier_call_chain+0x51/0xa0
  [<ffffffff8020b210>] ? mwait_idle+0x0/0x50
  [<ffffffff8020b0a0>] ? default_idle+0x0/0x80
  [<ffffffff8024b271>] atomic_notifier_call_chain+0x11/0x20
  [<ffffffff8020a849>] __exit_idle+0x29/0x30
  [<ffffffff8020b178>] cpu_idle+0x58/0xa0
  [<ffffffff80450d0e>] start_secondary+0x2fe/0x430

---[ end trace ca143223eefdc828 ]---
possible reason: unannotated irqs-on.
irq event stamp: 12
hardirqs last  enabled at (11): [<ffffffff80456a75>] 
_spin_unlock_irqrestore+0x55/0x60
hardirqs last disabled at (12): [<ffffffff8020b16c>] cpu_idle+0x4c/0xa0
softirqs last  enabled at (0): [<ffffffff8022db52>] 
copy_process+0x2d2/0x16a0
softirqs last disabled at (0): [<0000000000000000>] 0x0
khelper used greatest stack depth: 5920 bytes left
net_namespace: 1144 bytes



Bernard Pidoux
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