On 04/13/2015 03:32 AM, Huang Ying wrote:

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile.git master
commit fd036dc79578c6e9490af03eaf87c10e9d158c9c ("watchdog: add watchdog_exclude sysctl to assist nohz")

Thanks. This patch is going to go via a different route eventually, and I've removed
it from the tile tree. (The bug in question has also been fixed.)



+----------------------------------------------------------+------------+------------+
|                                                          | 371532c270 | fd036dc795 |
+----------------------------------------------------------+------------+------------+
| boot_successes                                           | 10         | 0          |
| early-boot-hang                                          | 1          |            |
| boot_failures                                            | 0          | 10         |
| WARNING:at_mm/memblock.c:#memblock_virt_alloc_internal() | 0          | 10         |
| BUG:unable_to_handle_kernel                              | 0          | 10         |
| Oops                                                     | 0          | 10         |
| RIP:__bitmap_empty                                       | 0          | 10         |
| Kernel_panic-not_syncing:Fatal_exception                 | 0          | 10         |
| backtrace:alloc_bootmem_cpumask_var                      | 0          | 10         |
| backtrace:lockup_detector_init                           | 0          | 10         |
| backtrace:kernel_init_freeable                           | 0          | 10         |
+----------------------------------------------------------+------------+------------+


[    0.078023] Performance Events: Broken PMU hardware detected, using software events only.
[    0.080002] Failed to access perfctr msr (MSR c1 is 0)
[    0.082279] ------------[ cut here ]------------
[    0.083005] WARNING: CPU: 0 PID: 1 at mm/memblock.c:1151 memblock_virt_alloc_internal+0x7e/0x142()
[    0.084002] Modules linked in:
[    0.085003] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc6-wl-ath-05581-g50ad550 #1
[    0.086002] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    0.087002]  ffffffff81c7870e ffff88013ab77d78 ffffffff81937e53 0000000000000cfe
[    0.089002]  0000000000000000 ffff88013ab77db8 ffffffff8107281a ffff88013ab77e28
[    0.091002]  0000000000000000 00000000ffffffff 0000000000000000 0000000000000400
[    0.093002] Call Trace:
[    0.094006]  [<ffffffff81937e53>] dump_stack+0x4c/0x65
[    0.095005]  [<ffffffff8107281a>] warn_slowpath_common+0x8a/0xc0
[    0.096003]  [<ffffffff8107290a>] warn_slowpath_null+0x1a/0x20
[    0.097004]  [<ffffffff81fa28d8>] memblock_virt_alloc_internal+0x7e/0x142
[    0.098004]  [<ffffffff81fa2b02>] memblock_virt_alloc_try_nid+0x5f/0x95
[    0.099004]  [<ffffffff81fbb823>] alloc_bootmem_cpumask_var+0x1d/0x24
[    0.100004]  [<ffffffff81f9a5c8>] lockup_detector_init+0x28/0x9a
[    0.101005]  [<ffffffff81f740d1>] kernel_init_freeable+0x128/0x248
[    0.102004]  [<ffffffff8192b2a0>] ? rest_init+0x90/0x90
[    0.103003]  [<ffffffff8192b2ae>] kernel_init+0xe/0xf0
[    0.104004]  [<ffffffff81940958>] ret_from_fork+0x58/0x90
[    0.105003]  [<ffffffff8192b2a0>] ? rest_init+0x90/0x90
[    0.106006] ---[ end trace 1bd7ba7378ad664f ]---
[    0.107006] BUG: unable to handle kernel NULL pointer dereference at           (null)



Thanks,
Ying Huang

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Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com