From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763308Ab3EDAQF (ORCPT ); Fri, 3 May 2013 20:16:05 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:55488 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762322Ab3EDAQD (ORCPT ); Fri, 3 May 2013 20:16:03 -0400 X-Nat-Received: from [202.181.97.72]:60084 [ident-empty] by smtp-proxy.isp with TPROXY id 1367626552.20444 To: cl@linux.com Cc: glommer@parallels.com, penberg@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [linux-next-20130422] Bug in SLAB? From: Tetsuo Handa References: <0000013e6705da99-094923c6-e239-43d2-8f0c-5e661656a27c-000000@email.amazonses.com><201305031726.BJG78631.tQSOVOLHJFMFFO@I-love.SAKURA.ne.jp><0000013e6b90e65e-e0e184d9-7da5-4873-9572-3b40958552e2-000000@email.amazonses.com><201305040348.CIF81716.OStQOHFJMFLOVF@I-love.SAKURA.ne.jp><0000013e6bd7a766-8473586c-7937-4129-bad1-a4198acdddcf-000000@email.amazonses.com> In-Reply-To: <0000013e6bd7a766-8473586c-7937-4129-bad1-a4198acdddcf-000000@email.amazonses.com> Message-Id: <201305040915.AID02071.FHVQJtOFOMOLSF@I-love.SAKURA.ne.jp> X-Mailer: Winbiff [Version 2.51 PL2] X-Accept-Language: ja,en,zh Date: Sat, 4 May 2013 09:15:46 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Anti-Virus: Kaspersky Anti-Virus for Linux Mail Server 5.6.45.2/RELEASE, bases: 03052013 #9880688, status: clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Christoph Lameter wrote: > Ok could I see the kernel logs with the warnings? Sure. ---------- testcase ---------- volatile unsigned int size; for (size = 4 * 1024 * 1024; size <= 32 * 1024 * 1024; size <<= 1) { void *ptr = kmalloc(size, GFP_KERNEL); printk("kmalloc(%u)=%p\n", size, ptr); kfree(ptr); } ---------- testcase ---------- ---------- before applying this patch ---------- kmalloc(4194304)=d9c00000 kmalloc(8388608)= (null) kmalloc(16777216)= (null) ------------[ cut here ]------------ Kernel BUG at c10b9c5b [verbose debug info unavailable] invalid opcode: 0000 [#1] SMP Modules linked in: test(OF+) binfmt_misc CPU: 0 PID: 3881 Comm: insmod Tainted: GF O 3.9.0-rc8-next-20130426 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 08/15/2008 task: df2a3b30 ti: de0a0000 task.ti: de0a0000 EIP: 0060:[] EFLAGS: 00010202 CPU: 0 EIP is at cache_alloc_refill+0x56b/0x590 EAX: 00000040 EBX: df002680 ECX: 00000000 EDX: 00000010 ESI: df000ac0 EDI: 00000000 EBP: 00000001 ESP: de0a1e08 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 CR0: 8005003b CR2: b769f3e0 CR3: 1f0fc000 CR4: 000006d0 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 DR6: ffff0ff0 DR7: 00000400 Stack: 00000000 00000000 00000000 000000d0 00000000 00000010 00000040 00000246 000000d0 00000000 00000000 df000ac0 00000202 000000d0 c10b9d0e ffffffff 00000000 e0838040 00000001 00000000 e083a01c e0838024 01000000 00000000 Call Trace: [] ? __kmalloc+0x8e/0xd0 [] ? test_init+0x1c/0x5c [test] [] ? do_one_initcall+0x32/0x170 [] ? __vunmap+0xa8/0xe0 [] ? 0xe0839fff [] ? load_module+0x1196/0x1560 [] ? SyS_init_module+0xb0/0xd0 [] ? sysenter_do_call+0x12/0x22 Code: 85 c0 0f 84 05 ff ff ff 31 c9 89 ea 89 f0 e8 8d f9 ff ff e9 f5 fe ff ff 0f 0b eb fe 8b 6e 20 f7 c5 01 00 00 00 0f 84 95 fd ff ff <0f> 0b eb fe 0f 0b eb fe 0f b6 44 24 1f 89 da 8b 4c 24 20 89 04 EIP: [] cache_alloc_refill+0x56b/0x590 SS:ESP 0068:de0a1e08 ---[ end trace f0be5ebb0e2c1371 ]--- ---------- before applying this patch ---------- ---------- after applying this patch ---------- kmalloc(4194304)=d7000000 ------------[ cut here ]------------ WARNING: at mm/slab_common.c:377 kmalloc_slab+0x57/0x70() Modules linked in: test(OF+) binfmt_misc CPU: 1 PID: 4337 Comm: insmod Tainted: GF W O 3.9.0-rc8-next-20130426-dirty #2 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 08/15/2008 c142f6a1 c102fbcb c1538e8c c153f938 00000179 c10a5197 c10a5197 d7000000 e1584040 00000001 000000d0 c102fc1b 00000009 00000000 c10a5197 d7000000 c10ba3da 00000286 d7000000 e1584040 00000001 00000000 e158601c e1584024 Call Trace: [] ? dump_stack+0xa/0x19 [] ? warn_slowpath_common+0x6b/0xa0 [] ? kmalloc_slab+0x57/0x70 [] ? kmalloc_slab+0x57/0x70 [] ? warn_slowpath_null+0x1b/0x20 [] ? kmalloc_slab+0x57/0x70 [] ? __kmalloc+0x1a/0xd0 [] ? test_init+0x1c/0x5c [test] [] ? do_one_initcall+0x32/0x170 [] ? __vunmap+0xa8/0xe0 [] ? 0xe1585fff [] ? load_module+0x1196/0x1560 [] ? SyS_init_module+0xb0/0xd0 [] ? sysenter_do_call+0x12/0x22 ---[ end trace b6ab930b322ad480 ]--- kmalloc(8388608)= (null) ------------[ cut here ]------------ WARNING: at mm/slab_common.c:377 kmalloc_slab+0x57/0x70() Modules linked in: test(OF+) binfmt_misc CPU: 1 PID: 4337 Comm: insmod Tainted: GF W O 3.9.0-rc8-next-20130426-dirty #2 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 08/15/2008 c142f6a1 c102fbcb c1538e8c c153f938 00000179 c10a5197 c10a5197 00000000 e1584040 00000001 000000d0 c102fc1b 00000009 00000000 c10a5197 00000000 c10ba3da ffffffff 00000000 e1584040 00000001 00000000 e158601c e1584024 Call Trace: [] ? dump_stack+0xa/0x19 [] ? warn_slowpath_common+0x6b/0xa0 [] ? kmalloc_slab+0x57/0x70 [] ? kmalloc_slab+0x57/0x70 [] ? warn_slowpath_null+0x1b/0x20 [] ? kmalloc_slab+0x57/0x70 [] ? __kmalloc+0x1a/0xd0 [] ? test_init+0x1c/0x5c [test] [] ? do_one_initcall+0x32/0x170 [] ? __vunmap+0xa8/0xe0 [] ? 0xe1585fff [] ? load_module+0x1196/0x1560 [] ? SyS_init_module+0xb0/0xd0 [] ? sysenter_do_call+0x12/0x22 ---[ end trace b6ab930b322ad481 ]--- kmalloc(16777216)= (null) ------------[ cut here ]------------ WARNING: at mm/slab_common.c:377 kmalloc_slab+0x57/0x70() Modules linked in: test(OF+) binfmt_misc CPU: 1 PID: 4337 Comm: insmod Tainted: GF W O 3.9.0-rc8-next-20130426-dirty #2 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 08/15/2008 c142f6a1 c102fbcb c1538e8c c153f938 00000179 c10a5197 c10a5197 00000000 e1584040 00000001 000000d0 c102fc1b 00000009 00000000 c10a5197 00000000 c10ba3da ffffffff 00000000 e1584040 00000001 00000000 e158601c e1584024 Call Trace: [] ? dump_stack+0xa/0x19 [] ? warn_slowpath_common+0x6b/0xa0 [] ? kmalloc_slab+0x57/0x70 [] ? kmalloc_slab+0x57/0x70 [] ? warn_slowpath_null+0x1b/0x20 [] ? kmalloc_slab+0x57/0x70 [] ? __kmalloc+0x1a/0xd0 [] ? test_init+0x1c/0x5c [test] [] ? do_one_initcall+0x32/0x170 [] ? __vunmap+0xa8/0xe0 [] ? 0xe1585fff [] ? load_module+0x1196/0x1560 [] ? SyS_init_module+0xb0/0xd0 [] ? sysenter_do_call+0x12/0x22 ---[ end trace b6ab930b322ad482 ]--- kmalloc(33554432)= (null) ---------- after applying this patch ----------