From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74618C433E0 for ; Fri, 10 Jul 2020 16:44:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 59C3B20767 for ; Fri, 10 Jul 2020 16:44:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728097AbgGJQoW (ORCPT ); Fri, 10 Jul 2020 12:44:22 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:47824 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727839AbgGJQoW (ORCPT ); Fri, 10 Jul 2020 12:44:22 -0400 Received: by mail-io1-f70.google.com with SMTP id s15so3951844iow.14 for ; Fri, 10 Jul 2020 09:44:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=VkWBimuMW8LfXvxvxg1C7asVbWSZFSw1leNLTE9Azsc=; b=lRYkasLnNJPMI/aHeJBjILl0Q02Ic7jGukr40BFYjc0SJ+DxyDw2ZV/73M4aQculNq 2yaOVxJfxiJK4Q8yQHLy3LUdaaeYUI9xWVuNuIr5gGUZjqI3cnDvRnr1ry4VJylW9M22 1KiIdef25Zn+E0gI/PndNUA285fjmtTApEfD3eY7nfleJZtMWdzjO0JNDlgFYC9WYL1t D5/JlVZ4nK3FdAc7F9IYipz8amht0Vk25I1H79vWSWNdXyL2cIj38hcCDDjkv2Niy3Gl VtIGox0OQ6Dc9I7h4nBK0WMSV9pxHHKVyDGO7UWgD+q3kfHkz17NyVDIhehSDnb1EQMM TvzA== X-Gm-Message-State: AOAM530HGxZ9qXX24xtWkmrJE4X5hf1TpAmin2a/W76IjnUFaVBsQaJM xybugjT2i5/3n2fSF9oeSFj+vreoq0cJIrv0Zy1qWPP5J8O8 X-Google-Smtp-Source: ABdhPJzhNR4HR3NlOZEonl9yrFEnPo5OVu2MPdxbLp7PueG9CU6JgVvE1paTy8ZQFK/E4zcgJcgi6nFRPPJH5m8gEQo6a7iRiQ4h MIME-Version: 1.0 X-Received: by 2002:a6b:bc41:: with SMTP id m62mr45978156iof.95.1594399461367; Fri, 10 Jul 2020 09:44:21 -0700 (PDT) Date: Fri, 10 Jul 2020 09:44:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008668d305aa190d58@google.com> Subject: WARNING in kmem_cache_free_bulk From: syzbot To: akpm@linux-foundation.org, cl@linux.com, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, penberg@kernel.org, rientjes@google.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14258fe3100000 kernel config: https://syzkaller.appspot.com/x/.config?x=7be693511b29b338 dashboard link: https://syzkaller.appspot.com/bug?extid=c07ac923fbf6351f6063 compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c07ac923fbf6351f6063@syzkaller.appspotmail.com ------------[ cut here ]------------ virt_to_cache: Object is not a Slab page! WARNING: CPU: 1 PID: 8538 at mm/slab.h:475 virt_to_cache mm/slab.h:475 [inline] WARNING: CPU: 1 PID: 8538 at mm/slab.h:475 cache_from_obj mm/slab.h:522 [inline] WARNING: CPU: 1 PID: 8538 at mm/slab.h:475 cache_from_obj mm/slab.h:506 [inline] WARNING: CPU: 1 PID: 8538 at mm/slab.h:475 kmem_cache_free_bulk+0x23e/0x290 mm/slab.c:3713 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 8538 Comm: kworker/1:2 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events kfree_rcu_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563 RIP: 0010:virt_to_cache mm/slab.h:475 [inline] RIP: 0010:cache_from_obj mm/slab.h:522 [inline] RIP: 0010:cache_from_obj mm/slab.h:506 [inline] RIP: 0010:kmem_cache_free_bulk+0x23e/0x290 mm/slab.c:3713 Code: fe ff ff 80 3d 96 a0 f6 08 00 0f 85 6d fe ff ff 48 c7 c6 e0 f1 55 88 48 c7 c7 08 18 69 89 c6 05 7b a0 f6 08 01 e8 d4 1d 92 ff <0f> 0b e9 4c fe ff ff 48 8b 47 08 48 c7 c6 d0 17 69 89 48 8d 50 ff RSP: 0018:ffffc90004617c78 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888092772580 RSI: ffffffff815d4f87 RDI: fffff520008c2f81 RBP: ffff888000000000 R08: 0000000000000001 R09: ffff8880ae720fcb R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880ae7253b0 R14: ffff888000152008 R15: 0000000000000000 kfree_bulk include/linux/slab.h:412 [inline] kfree_rcu_work+0x1a1/0x470 kernel/rcu/tree.c:3069 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.