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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3ECECC433EF for ; Sun, 24 Jul 2022 08:28:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230111AbiGXI2Z (ORCPT ); Sun, 24 Jul 2022 04:28:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229770AbiGXI2Y (ORCPT ); Sun, 24 Jul 2022 04:28:24 -0400 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C23A3B1E8 for ; Sun, 24 Jul 2022 01:28:22 -0700 (PDT) Received: by mail-il1-f200.google.com with SMTP id b15-20020a92c56f000000b002dd2870c587so2367456ilj.20 for ; Sun, 24 Jul 2022 01:28:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=siNdMcmVC1qeTk+B4F5oiCxVfKOp5O/Vi1z/Kzj7dHM=; b=3r/eOGBOF0eKrlxYyetdOWRtCErDutE3O/mOc+u0wI7KESdIltA06Z2RBXJO4SU7Zh X4stwWImLid5sBrU1dm1XNZK+C2n1nQTsgBHA+bmlopuXynS68cdR69+yrGWuuL1C6VT wRCWq8/nuoHwZFT0fCf0nkzvP/UINWwNEVGaM6AjJZI76KaniiBg0/dL7nQWb5GIAU6l lwzutujuF6HJbKbXG161sc4xhcw+dy6UvmFA/4IJmJTayMqNJGr+wwR7WJWwuUfgIlWz ILqgLByaKDeravBERdaTu6w0pjWivceDiRPNH4x/l9WIfisfQzKU0TBX1h+Qj+9A11qg 4oXQ== X-Gm-Message-State: AJIora/iDC7U+XAkzgrtr2wsTgpbW57AChdvX48LYtldBYAV+c80JeC3 fmt7GgwItvTRCsbCqB04EcFkd0z5MdyUAIpBEHeGh5Us99SM X-Google-Smtp-Source: AGRyM1uGd9OBXtc0p0/1RqGf8T8rg3nLMfi8PXAhc6xK5yfQmQ85b1uF9FpNl81Z6HQczKkJ1DqoA4VoOjTpCjCT1HxtwbABIo6x MIME-Version: 1.0 X-Received: by 2002:a6b:2a42:0:b0:67c:5ab8:a34e with SMTP id q63-20020a6b2a42000000b0067c5ab8a34emr2408381ioq.143.1658651302109; Sun, 24 Jul 2022 01:28:22 -0700 (PDT) Date: Sun, 24 Jul 2022 01:28:22 -0700 In-Reply-To: <00000000000011f0c905d9097a62@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ab295405e488d921@google.com> Subject: Re: [syzbot] WARNING in p9_client_destroy From: syzbot To: asmadeus@codewreck.org, davem@davemloft.net, edumazet@google.com, ericvh@gmail.com, k.kahurani@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux_oss@crudebyte.com, lucho@ionkov.net, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, v9fs-developer@lists.sourceforge.net Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: cb71b93c2dc3 Add linux-next specific files for 20220628 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=106a4022080000 kernel config: https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb dashboard link: https://syzkaller.appspot.com/bug?extid=5e28cdb7ebd0f2389ca4 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=156f74ee080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5e28cdb7ebd0f2389ca4@syzkaller.appspotmail.com ------------[ cut here ]------------ kmem_cache_destroy 9p-fcall-cache: Slab cache still has objects when called from p9_client_destroy+0x213/0x370 net/9p/client.c:1100 WARNING: CPU: 0 PID: 3687 at mm/slab_common.c:505 kmem_cache_destroy mm/slab_common.c:505 [inline] WARNING: CPU: 0 PID: 3687 at mm/slab_common.c:505 kmem_cache_destroy+0x138/0x140 mm/slab_common.c:493 Modules linked in: CPU: 1 PID: 3687 Comm: syz-executor.0 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 RIP: 0010:kmem_cache_destroy mm/slab_common.c:505 [inline] RIP: 0010:kmem_cache_destroy+0x138/0x140 mm/slab_common.c:493 Code: 95 18 00 48 89 ef e8 07 96 18 00 eb cc c3 48 8b 55 60 48 c7 c6 80 da d7 89 48 c7 c7 88 e8 61 8b 48 8b 4c 24 18 e8 f2 3a 86 07 <0f> 0b eb ab 0f 1f 40 00 41 56 41 89 d6 41 55 49 89 f5 41 54 49 89 RSP: 0018:ffffc900034efcf0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 1ffff9200069dfa5 RCX: 0000000000000000 RDX: ffff88807513ba80 RSI: ffffffff81610608 RDI: fffff5200069df90 RBP: ffff88801f0cc8c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffffc900034efd68 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000555556019400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe57b1fe718 CR3: 00000000728bc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: p9_client_destroy+0x213/0x370 net/9p/client.c:1100 v9fs_session_close+0x45/0x2d0 fs/9p/v9fs.c:504 v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:226 deactivate_locked_super+0x94/0x160 fs/super.c:332 deactivate_super+0xad/0xd0 fs/super.c:363 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1186 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7fe57ba8a677 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff19aa4578 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe57ba8a677 RDX: 00007fff19aa464c RSI: 000000000000000a RDI: 00007fff19aa4640 RBP: 00007fff19aa4640 R08: 00000000ffffffff R09: 00007fff19aa4410 R10: 000055555601a8b3 R11: 0000000000000246 R12: 00007fe57bae22a6 R13: 00007fff19aa5700 R14: 000055555601a810 R15: 00007fff19aa5740