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") +----------------------------------------------------------+------------+------------+ | | 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 _______________________________________________ LKP mailing list LKP(a)linux.intel.com