On 05/02/2014 09:41 AM, Catalin Marinas wrote: > Currently, kmemleak_early_log is disabled at the beginning of the > kmemleak_init() function, before the full kmemleak tracing is actually > enabled. In this small window, kmem_cache_create() is called by kmemleak > which triggers additional memory allocation that are not traced. This > patch moves the kmemleak_early_log disabling further down and at the > same time with full kmemleak enabling. > > Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> This patch makes the kernel die during the boot process: [ 24.471801] BUG: unable to handle kernel paging request at ffffffff922f2b93 [ 24.472496] IP: [<ffffffff922f2b93>] log_early+0x0/0xcd [ 24.473021] PGD 10e30067 PUD 10e31063 PMD 12200062 [ 24.473544] Oops: 0010 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 24.474129] Dumping ftrace buffer: [ 24.474535] (ftrace buffer empty) [ 24.474901] Modules linked in: [ 24.475220] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.15.0-rc4-sasha-00193-g315d7bf #442 [ 24.476094] task: ffff88025c540000 ti: ffff880036210000 task.ti: ffff880036210000 [ 24.476807] RIP: 0010:[<ffffffff922f2b93>] [<ffffffff922f2b93>] log_early+0x0/0xcd [ 24.477561] RSP: 0000:ffff880036211c20 EFLAGS: 00010246 [ 24.478075] RAX: 0000000000000000 RBX: ffff880034e26458 RCX: 0000000000000001 [ 24.478727] RDX: 0000000000000400 RSI: ffff880034e26458 RDI: 0000000000000000 [ 24.479400] RBP: ffff880036211c48 R08: 0000000000000000 R09: 0000000000000000 [ 24.480064] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000400 [ 24.480171] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88003680e600 [ 24.480171] FS: 0000000000000000(0000) GS:ffff880036c00000(0000) knlGS:0000000000000000 [ 24.480171] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 24.480171] CR2: ffffffff922f2b93 CR3: 0000000010e2d000 CR4: 00000000000006b0 [ 24.480171] Stack: [ 24.480171] ffffffff8f4fb6ac ffff880036ddb210 ffff880034e26458 0000000000000020 [ 24.480171] ffff88003680e600 ffff880036211cc8 ffffffff8c2e0bf1 0000000000000002 [ 24.480171] 000000008c19b731 ffffffff8cb07a03 0000000000000000 0000000000000400 [ 24.480171] Call Trace: [ 24.480171] [<ffffffff8f4fb6ac>] ? kmemleak_alloc+0xac/0xd0 [ 24.480171] [<ffffffff8c2e0bf1>] kmem_cache_alloc_node_trace+0x201/0x3d0 [ 24.480171] [<ffffffff8cb07a03>] ? alloc_cpumask_var_node+0x23/0x90 [ 24.480171] [<ffffffff8f566358>] ? preempt_count_sub+0xd8/0x130 [ 24.480171] [<ffffffff8c0c16e0>] ? alloc_pte_page+0x80/0x80 [ 24.480171] [<ffffffff8cb07a03>] alloc_cpumask_var_node+0x23/0x90 [ 24.480171] [<ffffffff8cb07a7e>] alloc_cpumask_var+0xe/0x10 [ 24.480171] [<ffffffff8c0a8a0a>] native_send_call_func_ipi+0x2a/0x130 [ 24.480171] [<ffffffff8cb07bee>] ? cpumask_next_and+0xae/0xd0 [ 24.480171] [<ffffffff8c0c16e0>] ? alloc_pte_page+0x80/0x80 [ 24.480171] [<ffffffff8c0c16e0>] ? alloc_pte_page+0x80/0x80 [ 24.480171] [<ffffffff8c20121b>] smp_call_function_many+0x29b/0x390 [ 24.480171] [<ffffffff8c0c16e0>] ? alloc_pte_page+0x80/0x80 [ 24.480171] [<ffffffff8c201726>] smp_call_function+0x46/0x80 [ 24.480171] [<ffffffff8c0c16e0>] ? alloc_pte_page+0x80/0x80 [ 24.480171] [<ffffffff8c2017ce>] on_each_cpu+0x3e/0x110 [ 24.480171] [<ffffffff8c0c3adb>] change_page_attr_set_clr+0x40b/0x4f0 [ 24.480171] [<ffffffff8c19b731>] ? get_parent_ip+0x11/0x50 [ 24.480171] [<ffffffff8c0c49ef>] set_memory_np+0x2f/0x40 [ 24.480171] [<ffffffff8c0bf32d>] free_init_pages+0x8d/0xb0 [ 24.480171] [<ffffffff8f4f7d60>] ? rest_init+0x140/0x140 [ 24.480171] [<ffffffff8c0bf373>] free_initmem+0x23/0x30 [ 24.480171] [<ffffffff8f4f7d78>] kernel_init+0x18/0x100 [ 24.480171] [<ffffffff8f56b0fc>] ret_from_fork+0x7c/0xb0 [ 24.480171] [<ffffffff8f4f7d60>] ? rest_init+0x140/0x140 [ 24.480171] Code: Bad RIP value. [ 24.480171] RIP [<ffffffff922f2b93>] log_early+0x0/0xcd [ 24.480171] RSP <ffff880036211c20> [ 24.480171] CR2: ffffffff922f2b93 Thanks, Sasha -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>