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Date: Tue, 26 Feb 2008 08:33:54 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Dave Young <hidave.darkstar@gmail.com>
Cc: linux-kernel@vger.kernel.org, "Paul E. McKenney" <paulmck@us.ibm.com>,
       Ingo Molnar <mingo@elte.hu>
Subject: Re: [BUG] using smp_processor_id() in preemptible as suspending
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On Tue, 26 Feb 2008 16:24:11 +0800 Dave Young <hidave.darkstar@gmail.com> wrote:

> I don't know whom I should mail to, could you cc the proper guy? Thanks.
> 
> [  118.331674] acpi LNXSYSTM:00: suspend
> [  118.331674] Disabling non-boot CPUs ...
> [  118.331674] CPU0 attaching NULL sched-domain.
> [  118.331674] CPU1 attaching NULL sched-domain.
> [  118.438750] CPU 1 is now offline
> [  118.438750] lockdep: fixing up alternatives.
> [  118.438750] SMP alternatives: switching to UP code
> [  118.438750] BUG: using smp_processor_id() in preemptible [00000000] code: s2ram/2818
> [  118.438750] caller is rcu_offline_cpu+0x15a/0x1c0
> [  118.438750] Pid: 2818, comm: s2ram Not tainted 2.6.25-rc3-test #2
> [  118.438750]  [<c0129738>] ? printk+0x18/0x20
> [  118.438750]  [<c025c551>] debug_smp_processor_id+0xb1/0xc0
> [  118.438750]  [<c0161f8a>] rcu_offline_cpu+0x15a/0x1c0
> [  118.438750]  [<c03d408f>] rcu_cpu_notify+0x3f/0x60
> [  118.438750]  [<c0141b0d>] notifier_call_chain+0x3d/0x80
> [  118.438750]  [<c0141db9>] __raw_notifier_call_chain+0x19/0x20
> [  118.438750]  [<c0141dda>] raw_notifier_call_chain+0x1a/0x20
> [  118.438750]  [<c015262b>] _cpu_down+0x13b/0x230
> [  118.438750]  [<c01527c9>] disable_nonboot_cpus+0x49/0xd0
> [  118.438750]  [<c0157492>] suspend_devices_and_enter+0x72/0x130
> [  118.438750]  [<c0129738>] ? printk+0x18/0x20
> [  118.438750]  [<c0157623>] enter_state+0xb3/0xe0
> [  118.438750]  [<c015777d>] state_store+0x7d/0xc0
> [  118.438750]  [<c0157700>] ? state_store+0x0/0xc0
> [  118.438750]  [<c0249e4e>] kobj_attr_store+0x2e/0x40
> [  118.438750]  [<c01ca957>] flush_write_buffer+0x47/0x70
> [  118.438750]  [<c01ca9c9>] sysfs_write_file+0x49/0x70
> [  118.438750]  [<c0188d41>] vfs_write+0x91/0x140
> [  118.438750]  [<c0188e9d>] sys_write+0x3d/0x70
> [  118.438750]  [<c0104fca>] syscall_call+0x7/0xb
> [  118.438750]  =======================
> [  118.438750] CPU0 attaching NULL sched-domain.
> [  118.440335] CPU1 is down

Paul & Ingo I guess

> My .config 

Doesn't tell us whether you'r eusing CONFIG_CLASSIC_RCU or
CONFIG_PREEMPT_RCU.  I assume CONFIG_CLASSIC_RCU, if you ran `make
oldconfig'.

Which kernel are you running here?