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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 05C72C5CFEB for ; Mon, 9 Jul 2018 17:07:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B15F220840 for ; Mon, 9 Jul 2018 17:07:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B15F220840 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933705AbeGIRHF (ORCPT ); Mon, 9 Jul 2018 13:07:05 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:39192 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933495AbeGIRHC (ORCPT ); Mon, 9 Jul 2018 13:07:02 -0400 Received: by mail-io0-f200.google.com with SMTP id x14-v6so16798022ioa.6 for ; Mon, 09 Jul 2018 10:07:02 -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=n3pkiplEhnCEqQYLZmvPd1xZf6hM9YN/70vQEOyd1ec=; b=aSWZHWZWoQCxbaUs1ohW5POJHdjhpLwLPZUI/r5co8MHhLhIcbPu0sgkDQlqP2y0OS Wg9zxrxk01mEcqk2qocIhixqskb7BZsHJ8NkH2PO06/o8kOnltV80yumSy2xHJO5GtzR pniVr5dqxG6wCFRdSz28tboxihYGa/i16U1pGLfOUAIw2SV1uGk4U7yQ5diHHnvf6SBN Pn+0GZBPVgLxeVxXE/IvjMV2SXYXxb02oL1RxObHXlQAnVqQrkzDKW/4iwuqkOcdh8o2 STsTcTPQQwKyQ2/7tgy+UtFu9lD2UKCixgCdLfkOMKSYlWazbg00y/ZSyvy5L0r4Rlwu IPoA== X-Gm-Message-State: APt69E2dkRtA58fcgsqWdB8Qks0P/7Tf+AcdvRr7JVNscY8IB/2Yro6M 5/i/Q+MaDIFUvMDQeviGuAjU42gPS9z4GovjCwSsgAv5TuvG X-Google-Smtp-Source: AAOMgpdqkFadjhX+qK8wD1hIpK8hy3IqAVLTjHqNCUxQDmMUKZPmIwLZOMe5XwSo047b1Vn3HAMB0dSbWHMpbmTrotWT/cGI37sK MIME-Version: 1.0 X-Received: by 2002:a02:b705:: with SMTP id g5-v6mr9703198jam.10.1531156022344; Mon, 09 Jul 2018 10:07:02 -0700 (PDT) Date: Mon, 09 Jul 2018 10:07:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000cec1940570940acf@google.com> Subject: INFO: task hung in vfs_removexattr From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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: 1e4b044d2251 Linux 4.18-rc4 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14dc81b2400000 kernel config: https://syzkaller.appspot.com/x/.config?x=25856fac4e580aa7 dashboard link: https://syzkaller.appspot.com/bug?extid=9d0373cdac2be4979750 compiler: gcc (GCC) 8.0.1 20180413 (experimental) 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+9d0373cdac2be4979750@syzkaller.appspotmail.com netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor0'. INFO: task syz-executor5:14548 blocked for more than 140 seconds. Not tainted 4.18.0-rc4+ #138 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D24752 14548 4547 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 __rwsem_down_write_failed_common+0x95d/0x1630 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:715 [inline] vfs_removexattr+0x82/0x1c0 fs/xattr.c:391 removexattr+0xd3/0x130 fs/xattr.c:691 path_removexattr+0x1b9/0x210 fs/xattr.c:705 __do_sys_removexattr fs/xattr.c:719 [inline] __se_sys_removexattr fs/xattr.c:716 [inline] __x64_sys_removexattr+0x59/0x80 fs/xattr.c:716 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455e29 Code: cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 ab 04 00 00 48 83 ec 58 48 89 6c 24 50 48 8d 6c 24 50 48 8b 44 24 60 c6 00 00 <48> 8b 4c 24 68 48 89 ca 48 89 50 08 48 8b 59 20 48 01 da 31 db 31 RSP: 002b:00007f4465180c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5 RAX: ffffffffffffffda RBX: 00007f44651816d4 RCX: 0000000000455e29 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000020000380 RBP: 000000000072bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bbfeb R14: 00000000004d1108 R15: 0000000000000001 Showing all locks held in the system: 1 lock held by khungtaskd/901: #0: 00000000ebf24c36 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4405: 2 locks held by getty/4495: #0: 00000000692a9d2f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000072fe5412 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4496: #0: 000000002b623882 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000056c15f7c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4497: #0: 000000002c1f858b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000048aba06b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4498: #0: 00000000da02f89a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000004a06c40f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4499: #0: 0000000017508207 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a4b24877 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4500: #0: 0000000079a247d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000009bcfd45d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4501: #0: 00000000e73958a9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000007d96a629 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor5/14500: #0: 00000000ba1ef7f9 (sb_writers#19){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 00000000ba1ef7f9 (sb_writers#19){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000e4cbde96 (&sb->s_type->i_mutex_key#25){++++}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000e4cbde96 (&sb->s_type->i_mutex_key#25){++++}, at: vfs_removexattr+0x82/0x1c0 fs/xattr.c:391 2 locks held by syz-executor5/14548: #0: 00000000ba1ef7f9 (sb_writers#19){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 00000000ba1ef7f9 (sb_writers#19){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000e4cbde96 (&sb->s_type->i_mutex_key#25){++++}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000e4cbde96 (&sb->s_type->i_mutex_key#25){++++}, at: vfs_removexattr+0x82/0x1c0 fs/xattr.c:391 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc4+ #138 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 --- 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#bug-status-tracking for how to communicate with syzbot.