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Date: Thu, 7 Jul 2016 12:01:17 +0200 From: Alexander Potapenko <glider@...gle.com> To: Sasha Levin <sasha.levin@...cle.com> Cc: Andrey Konovalov <adech.fo@...il.com>, Christoph Lameter <cl@...ux.com>, Dmitriy Vyukov <dvyukov@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Steven Rostedt <rostedt@...dmis.org>, Joonsoo Kim <iamjoonsoo.kim@....com>, Joonsoo Kim <js1304@...il.com>, Kostya Serebryany <kcc@...gle.com>, Andrey Ryabinin <aryabinin@...tuozzo.com>, Kuthonuzo Luruo <kuthonuzo.luruo@....com>, kasan-dev <kasan-dev@...glegroups.com>, Linux Memory Management List <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v5] mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB Any idea which config option triggers this code path? I don't see it with my config, and the config from kbuild doesn't boot for me. (I'm trying to bisect the diff between them now) On Tue, Jul 5, 2016 at 1:42 AM, Sasha Levin <sasha.levin@...cle.com> wrote: > On 06/22/2016 01:43 PM, Alexander Potapenko wrote: >> For KASAN builds: >> - switch SLUB allocator to using stackdepot instead of storing the >> allocation/deallocation stacks in the objects; >> - change the freelist hook so that parts of the freelist can be put >> into the quarantine. > > This commit seems to be causing the following on boot (bisected): > > [ 0.000000] ============================================================================= > > [ 0.000000] BUG radix_tree_node (Not tainted): Object padding overwritten > > [ 0.000000] ----------------------------------------------------------------------------- > > [ 0.000000] > > [ 0.000000] Disabling lock debugging due to kernel taint > > [ 0.000000] INFO: 0xffff88004fc01600-0xffff88004fc01600. First byte 0x58 instead of 0x5a > > [ 0.000000] INFO: Slab 0xffffea00013f0000 objects=34 used=34 fp=0x (null) flags=0x1fffff80004080 > > [ 0.000000] INFO: Object 0xffff88004fc01278 @offset=4728 fp=0xffff88004fc033a8 > > [ 0.000000] > > [ 0.000000] Redzone ffff88004fc01270: bb bb bb bb bb bb bb bb ........ > > [ 0.000000] Object ffff88004fc01278: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01288: 00 00 00 00 00 00 00 00 90 12 c0 4f 00 88 ff ff ...........O.... > > [ 0.000000] Object ffff88004fc01298: 90 12 c0 4f 00 88 ff ff 00 00 00 00 00 00 00 00 ...O............ > > [ 0.000000] Object ffff88004fc012a8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc012b8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc012c8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc012d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc012e8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc012f8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01308: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01318: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01328: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01338: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01348: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01358: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01368: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01378: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01388: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01398: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc013a8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc013b8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc013c8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc013d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc013e8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc013f8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01408: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01418: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01428: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01438: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01448: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01458: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01468: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01478: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01488: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc01498: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Object ffff88004fc014a8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > [ 0.000000] Redzone ffff88004fc014b8: bb bb bb bb bb bb bb bb ........ > > [ 0.000000] Padding ffff88004fc015f8: 5a 5a 5a 5a 5a 5a 5a 5a 58 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZXZZZZZZZ > > [ 0.000000] Padding ffff88004fc01608: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ > > [ 0.000000] Padding ffff88004fc01618: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ > > [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 4.7.0-rc5-next-20160704-sasha-00024-ge77e3f3 #3135 > > [ 0.000000] 1ffffffff4c40f12 9d094fbe896d693a ffffffffa6207918 ffffffff9b06d567 > > [ 0.000000] ffffffff00000000 fffffbfff4cb1f60 0000000041b58ab3 ffffffffa5d082b8 > > [ 0.000000] ffffffff9b06d3f8 9d094fbe896d693a ffffffffa6238040 ffffffffa5d26f04 > > [ 0.000000] Call Trace: > > [ 0.000000] dump_stack (lib/dump_stack.c:53) > [ 0.000000] ? arch_local_irq_restore (./arch/x86/include/asm/paravirt.h:134) > [ 0.000000] ? print_section (./arch/x86/include/asm/current.h:14 include/linux/kasan.h:35 mm/slub.c:481 mm/slub.c:512) > [ 0.000000] print_trailer (mm/slub.c:670) > [ 0.000000] check_bytes_and_report (mm/slub.c:712 mm/slub.c:738) > [ 0.000000] check_object (mm/slub.c:868) > [ 0.000000] ? radix_tree_node_alloc (lib/radix-tree.c:306) > [ 0.000000] alloc_debug_processing (mm/slub.c:1068 mm/slub.c:1079) > [ 0.000000] ___slab_alloc (mm/slub.c:2571 (discriminator 1)) > [ 0.000000] ? radix_tree_node_alloc (lib/radix-tree.c:306) > [ 0.000000] ? radix_tree_node_alloc (lib/radix-tree.c:306) > [ 0.000000] ? check_preemption_disabled (lib/smp_processor_id.c:52) > [ 0.000000] ? radix_tree_node_alloc (lib/radix-tree.c:306) > [ 0.000000] __slab_alloc.isra.23 (./arch/x86/include/asm/paravirt.h:789 mm/slub.c:2602) > [ 0.000000] ? radix_tree_node_alloc (lib/radix-tree.c:306) > [ 0.000000] kmem_cache_alloc (mm/slub.c:2664 mm/slub.c:2706 mm/slub.c:2711) > [ 0.000000] ? deactivate_slab (mm/slub.c:2129) > [ 0.000000] radix_tree_node_alloc (lib/radix-tree.c:306) > [ 0.000000] __radix_tree_create (lib/radix-tree.c:505 lib/radix-tree.c:561) > [ 0.000000] ? radix_tree_maybe_preload_order (lib/radix-tree.c:550) > [ 0.000000] ? alloc_cpumask_var_node (lib/cpumask.c:64) > [ 0.000000] ? kasan_unpoison_shadow (mm/kasan/kasan.c:59) > [ 0.000000] ? kasan_kmalloc (mm/kasan/kasan.c:498 mm/kasan/kasan.c:592) > [ 0.000000] __radix_tree_insert (lib/radix-tree.c:637) > [ 0.000000] ? __radix_tree_create (lib/radix-tree.c:629) > [ 0.000000] ? _find_next_bit (lib/find_bit.c:54) > [ 0.000000] ? alloc_desc (kernel/irq/irqdesc.c:190) > [ 0.000000] early_irq_init (kernel/irq/irqdesc.c:279 (discriminator 1)) > [ 0.000000] start_kernel (init/main.c:563) > [ 0.000000] ? thread_stack_cache_init (??:?) > [ 0.000000] ? memblock_reserve (mm/memblock.c:737) > [ 0.000000] ? early_idt_handler_array (arch/x86/kernel/head_64.S:361) > [ 0.000000] x86_64_start_reservations (arch/x86/kernel/head64.c:196) > [ 0.000000] x86_64_start_kernel (arch/x86/kernel/head64.c:176) > [ 0.000000] FIX radix_tree_node: Restoring 0xffff88004fc01600-0xffff88004fc01600=0x5a > > > Thanks, > Sasha -- Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Straße, 33 80636 München Geschäftsführer: Matthew Scott Sucherman, Paul Terence Manicle Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg
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