Hi,

This bug should have been fixed by "[PATCH -next] cpuset: initialize
cpuset a bit early":

http://www.spinics.net/lists/cgroups/msg12599.html

Thanks,
Vladimir

On Fri, Mar 06, 2015 at 01:57:58PM +0800, Fengguang Wu wrote:

[    0.021989] ------------[ cut here ]------------
[    0.021989] ------------[ cut here ]------------
[    0.022816] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1439 warn_pre_alternatives+0x25/0x2e()
[    0.022816] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1439 warn_pre_alternatives+0x25/0x2e()
[    0.024000] You're using static_cpu_has before alternatives have run!
[    0.024000] You're using static_cpu_has before alternatives have run!
[    0.024000] Modules linked in:
[    0.024000] Modules linked in:

[    0.024000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.0.0-rc1-00004-g295458e #455
[    0.024000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.0.0-rc1-00004-g295458e #455
[    0.024000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    0.024000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    0.024000]  0000000000000009
[    0.024000]  0000000000000009 ffffffff81e03cc8 ffffffff81e03cc8 ffffffff81674d02 ffffffff81674d02 ffffffff810ca88e ffffffff810ca88e

[    0.024000]  ffffffff81e03d18
[    0.024000]  ffffffff81e03d18 ffffffff81e03d08 ffffffff81e03d08 ffffffff81073d6f ffffffff81073d6f 0000000000000000 0000000000000000

[    0.024000]  ffffffff81018f79
[    0.024000]  ffffffff81018f79 ffffffff81e03e38 ffffffff81e03e38 0000000000000000 0000000000000000 0000000000000002 0000000000000002

[    0.024000] Call Trace:
[    0.024000] Call Trace:
[    0.024000]  [<ffffffff81674d02>] dump_stack+0xa0/0xd5
[    0.024000]  [<ffffffff81674d02>] dump_stack+0xa0/0xd5
[    0.024000]  [<ffffffff810ca88e>] ? console_unlock+0x496/0x4ef
[    0.024000]  [<ffffffff810ca88e>] ? console_unlock+0x496/0x4ef
[    0.024000]  [<ffffffff81073d6f>] warn_slowpath_common+0xc8/0xf7
[    0.024000]  [<ffffffff81073d6f>] warn_slowpath_common+0xc8/0xf7
[    0.024000]  [<ffffffff81018f79>] ? warn_pre_alternatives+0x25/0x2e
[    0.024000]  [<ffffffff81018f79>] ? warn_pre_alternatives+0x25/0x2e
[    0.024000]  [<ffffffff81073e6a>] warn_slowpath_fmt+0x4f/0x58
[    0.024000]  [<ffffffff81073e6a>] warn_slowpath_fmt+0x4f/0x58
[    0.024000]  [<ffffffff81680f47>] ? native_iret+0x7/0x7
[    0.024000]  [<ffffffff81680f47>] ? native_iret+0x7/0x7
[    0.024000]  [<ffffffff81018f79>] warn_pre_alternatives+0x25/0x2e
[    0.024000]  [<ffffffff81018f79>] warn_pre_alternatives+0x25/0x2e
[    0.024000]  [<ffffffff81039306>] __do_page_fault+0x2b4/0x7c2
[    0.024000]  [<ffffffff81039306>] __do_page_fault+0x2b4/0x7c2
[    0.024000]  [<ffffffff81039852>] do_page_fault+0x3e/0x4a
[    0.024000]  [<ffffffff81039852>] do_page_fault+0x3e/0x4a
[    0.024000]  [<ffffffff81034109>] do_async_page_fault+0x3a/0xb9
[    0.024000]  [<ffffffff81034109>] do_async_page_fault+0x3a/0xb9
[    0.024000]  [<ffffffff81681a28>] async_page_fault+0x28/0x30
[    0.024000]  [<ffffffff81681a28>] async_page_fault+0x28/0x30
[    0.024000]  [<ffffffff8110d870>] ? cpumask_copy+0x2c/0x2f
[    0.024000]  [<ffffffff8110d870>] ? cpumask_copy+0x2c/0x2f
[    0.024000]  [<ffffffff8110e174>] ? cpuset_bind+0x5b/0xc4
[    0.024000]  [<ffffffff8110e174>] ? cpuset_bind+0x5b/0xc4
[    0.024000]  [<ffffffff8234d780>] cgroup_init+0x2fa/0x3d3
[    0.024000]  [<ffffffff8234d780>] cgroup_init+0x2fa/0x3d3
[    0.024000]  [<ffffffff8232f5fe>] start_kernel+0x6ed/0x755
[    0.024000]  [<ffffffff8232f5fe>] start_kernel+0x6ed/0x755
[    0.024000]  [<ffffffff8232e120>] ? early_idt_handlers+0x120/0x120
[    0.024000]  [<ffffffff8232e120>] ? early_idt_handlers+0x120/0x120
[    0.024000]  [<ffffffff8232e585>] x86_64_start_reservations+0x46/0x4f
[    0.024000]  [<ffffffff8232e585>] x86_64_start_reservations+0x46/0x4f
[    0.024000]  [<ffffffff8232e73e>] x86_64_start_kernel+0x1b0/0x1c6
[    0.024000]  [<ffffffff8232e73e>] x86_64_start_kernel+0x1b0/0x1c6
[    0.024000] ---[ end trace 37d9a871c47a31bc ]---
[    0.024000] ---[ end trace 37d9a871c47a31bc ]---