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=-5.4 required=3.0 tests=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 CB2BEC55186 for ; Fri, 24 Apr 2020 05:15:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1BCD2076C for ; Fri, 24 Apr 2020 05:15:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726298AbgDXFPT (ORCPT ); Fri, 24 Apr 2020 01:15:19 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:47886 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725919AbgDXFPS (ORCPT ); Fri, 24 Apr 2020 01:15:18 -0400 Received: by mail-io1-f71.google.com with SMTP id v23so8946146ioj.14 for ; Thu, 23 Apr 2020 22:15:16 -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=GsHJhhlI69iEbus5Kx/hbxlTWBhT5w75wH6LGF6jvQc=; b=BMfHdBI2jy3CWBvb4Hp1eNs8sgQJC5VehJ359pCEoo+hjw7ZUb0pp0A9QsxX74rhaD KtmffS17LcUN7aihRPC44ZoOY+zCC2fVCW9jV8j9UMvpCIMqY81oP88eVY0MKoqjugMt fwg4BZqw3XaC0pnJVZs77WPWInPTN1B8BN1yeF9SrKIOByJSdob1Nd71YDrzaw+P4mX3 CcF51+Agsn5hxcrEuKj4zgQBcagVzIiiEfXtF6GykcSCnVhfgbxNmGAiDA6AilIyaShR nwDay+Ovc30/+iZvCgjslIJ+x/3Rq/eFxbBpdn/ROgidMuC7BNg/uT1EcaMl4wePOpLP /A/w== X-Gm-Message-State: AGi0PuZzLxJyjvBlb/rEXAjY7BpPoW0APwxLtnZqXp66HnS0kTQ0kRQL Y11d895SjRZdNVhg8F3iLdtCCs96wIaTz2JOw0JHCPAlyThU X-Google-Smtp-Source: APiQypLNZY55mRUY+Mmi87BuLoHzMCupYhECQHvPJ03ziVJyAeMghmlQXeOc49mhYa6x8F7HgguHiEuOLWZwWaxI9wjEe9CNz5k0 MIME-Version: 1.0 X-Received: by 2002:a05:6602:1c6:: with SMTP id w6mr6684396iot.91.1587705315578; Thu, 23 Apr 2020 22:15:15 -0700 (PDT) Date: Thu, 23 Apr 2020 22:15:15 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000057d76f05a4027384@google.com> Subject: INFO: task hung in sock_close From: syzbot To: davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c578ddb3 Merge tag 'linux-kselftest-5.7-rc3' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=176044dfe00000 kernel config: https://syzkaller.appspot.com/x/.config?x=78a7d8adda44b4b dashboard link: https://syzkaller.appspot.com/bug?extid=b42220e45c511c2bf7ad compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) 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+b42220e45c511c2bf7ad@syzkaller.appspotmail.com INFO: task syz-executor.1:20765 blocked for more than 143 seconds. Not tainted 5.7.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26112 20765 7179 0x80004006 Call Trace: context_switch kernel/sched/core.c:3372 [inline] __schedule+0x805/0xc90 kernel/sched/core.c:4088 schedule+0x188/0x220 kernel/sched/core.c:4163 rwsem_down_write_slowpath+0x7d0/0xd60 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x125/0x130 kernel/locking/rwsem.c:1532 unregister_netdevice_notifier+0x30/0x380 net/core/dev.c:1776 inode_lock include/linux/fs.h:797 [inline] __sock_release net/socket.c:604 [inline] sock_close+0x94/0x260 net/socket.c:1283 bcm_release+0x77/0x800 net/can/bcm.c:1474 atomic64_set include/asm-generic/atomic-instrumented.h:854 [inline] atomic_long_set include/asm-generic/atomic-long.h:40 [inline] rwsem_set_owner kernel/locking/rwsem.c:176 [inline] __down_write kernel/locking/rwsem.c:1391 [inline] down_write+0xcd/0x130 kernel/locking/rwsem.c:1532 __sock_release net/socket.c:605 [inline] sock_close+0xd8/0x260 net/socket.c:1283 sock_mmap+0x90/0x90 net/socket.c:1278 __fput+0x2ed/0x750 fs/file_table.c:280 task_work_run+0x147/0x1d0 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x5ef/0x1f80 kernel/exit.c:795 do_group_exit+0x15e/0x2c0 kernel/exit.c:893 get_signal+0x13cf/0x1d60 kernel/signal.c:2735 do_signal+0x33/0x610 arch/x86/kernel/signal.c:784 rcu_read_unlock_sched include/linux/rcupdate.h:732 [inline] __fd_install+0x251/0x490 fs/file.c:613 exit_to_usermode_loop arch/x86/entry/common.c:148 [inline] prepare_exit_to_usermode+0x280/0x600 arch/x86/entry/common.c:196 exit_to_usermode_loop arch/x86/entry/common.c:161 [inline] prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:196 syscall_return_slowpath+0xf9/0x420 arch/x86/entry/common.c:278 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Showing all locks held in the system: 4 locks held by kworker/u4:2/88: 3 locks held by kworker/u4:3/128: 1 lock held by khungtaskd/1129: #0: ffffffff892e8550 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 net/mptcp/pm_netlink.c:858 1 lock held by in:imklog/6713: #0: ffff888095212bb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 fs/file.c:826 2 locks held by agetty/6722: #0: ffff888093fd9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc90000f802e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x260/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/20765: #0: ffff8880245bf750 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:797 [inline] #0: ffff8880245bf750 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: __sock_release net/socket.c:604 [inline] #0: ffff8880245bf750 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: sock_close+0x94/0x260 net/socket.c:1283 #1: ffffffff895ac1b0 (pernet_ops_rwsem){++++}-{3:3}, at: unregister_netdevice_notifier+0x30/0x380 net/core/dev.c:1776 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1129 Comm: khungtaskd Not tainted 5.7.0-rc2-syzkaller #0 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+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 arch_trigger_cpumask_backtrace+0x10/0x10 arch/x86/kernel/apic/hw_nmi.c:38 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd2a/0xd40 kernel/hung_task.c:289 kthread+0x353/0x380 kernel/kthread.c:268 hungtask_pm_notify+0x50/0x50 kernel/hung_task.c:265 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 20942 Comm: (md-udevd) Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_memory_region+0x2/0x2f0 mm/kasan/generic.c:192 Code: d1 e8 88 eb 0c 31 db 48 c7 c7 82 d1 e8 88 4c 89 fe 31 c0 e8 bd 61 ab ff eb d3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 41 57 <41> 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 0d 02 00 00 48 89 fb 48 RSP: 0018:ffffc90016bb7a70 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 00000000000000b2 RCX: ffffffff81596a64 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8b149500 RBP: ffffc90016bb7c70 R08: dffffc0000000000 R09: fffffbfff16292a1 R10: fffffbfff16292a1 R11: 0000000000000000 R12: 1ffff11005f0d1d7 R13: ffff88802f868ee8 R14: e91b78abf4a04936 R15: dffffc0000000000 FS: 00007fd711208500(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb179f01000 CR3: 000000004e7fd000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:3146 [inline] validate_chain+0x94/0x8920 kernel/locking/lockdep.c:3202 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] mark_lock+0x102/0x1b00 kernel/locking/lockdep.c:3912 __lock_acquire+0x116c/0x2c30 kernel/locking/lockdep.c:4355 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] mark_lock+0x102/0x1b00 kernel/locking/lockdep.c:3912 __lock_acquire+0x116c/0x2c30 kernel/locking/lockdep.c:4355 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline] do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 lock_acquire+0x169/0x480 kernel/locking/lockdep.c:4934 spin_lock include/linux/spinlock.h:353 [inline] __close_fd+0x2f/0x1f0 fs/file.c:631 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline] do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:353 [inline] __close_fd+0x2f/0x1f0 fs/file.c:631 spin_lock include/linux/spinlock.h:353 [inline] __close_fd+0x2f/0x1f0 fs/file.c:631 __do_sys_close fs/open.c:1270 [inline] __se_sys_close fs/open.c:1268 [inline] __x64_sys_close+0x62/0xb0 fs/open.c:1268 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fd70faa628d Code: c1 20 00 00 75 10 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 37 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd283f1d70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00000000000874f5 RCX: 00007fd70faa628d RDX: 00007ffd283f1dfc RSI: 00007ffd283f1df0 RDI: 00000000000874f5 RBP: 0000000000100000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000293 R12: 0000000000000003 R13: 00007ffd283f1df0 R14: 0000000000000000 R15: 00007ffd283f2070 --- This bug is generated by a bot. 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