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,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 CEFCCC83003 for ; Wed, 29 Apr 2020 09:59:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A483D2074A for ; Wed, 29 Apr 2020 09:59:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726811AbgD2J7P (ORCPT ); Wed, 29 Apr 2020 05:59:15 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:53564 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726493AbgD2J7P (ORCPT ); Wed, 29 Apr 2020 05:59:15 -0400 Received: by mail-io1-f69.google.com with SMTP id i26so1864161ioe.20 for ; Wed, 29 Apr 2020 02:59:13 -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=rBtCDC/1aj7/RN6lVwFtyJy8v88lLptWko+azv2s6gw=; b=JK0jdw1odRaBHpjYuL0C+KGZUAAd84W6d2OQQMKh9DB2Vp6wTRc3jECvfT8aQ3JKpO 9YhxEWaXSTrw90ariO4GJNuTtWSMyIkSImAlqwWCS6UTK2OQQCAml7A3EkZjSy1rp7Zz 5/cNAgo0hWNRxI74bs/YsOvRZ0X7izZAc8ZA6AdyEiISKe0iSiuKbiC4KNwQs0GhIOb7 ii2SXno2mYEWPv1ODi108te/R6/Cu1jE+TpOyQXO8FO6iMEIdEJogLqULzmcDwmJTtmB H8nKvaq4xb2s32hWcccQPu4S+s0sDPB9CkpyOraySJxMaBHeNDEXjs1IOyxDR94qFZ9k mIzA== X-Gm-Message-State: AGi0PuajcOR0Ys2B9mG/LYhIN+9l0Qd6T/GPMeIaKiVFryAJ9M4yOcav +YcSqoaK7+oPjvuWfLs1AEMaVqUQdEoh3HFf/3XlSa4gvTi8 X-Google-Smtp-Source: APiQypKEYyGbpU2BJsquRe8gsjMCxM+f3Dk4ay0KO+A8qe79qhFzzM3dTfIBmL5dFBMGoTGw4Lm8FvifMenIyYz+Z2E831pqQ56E MIME-Version: 1.0 X-Received: by 2002:a92:9a97:: with SMTP id c23mr29948979ill.7.1588154353545; Wed, 29 Apr 2020 02:59:13 -0700 (PDT) Date: Wed, 29 Apr 2020 02:59:13 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001779fd05a46b001f@google.com> Subject: INFO: task hung in linkwatch_event (2) From: syzbot To: allison@lohutok.net, aviad.krawczyk@huawei.com, axboe@kernel.dk, davem@davemloft.net, gregkh@linuxfoundation.org, io-uring@vger.kernel.org, kuba@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linyunsheng@huawei.com, luobin9@huawei.com, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, viro@zeniv.linux.org.uk 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: b4f63322 Merge branch 'for-linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1558936fe00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7a70e992f2f9b68 dashboard link: https://syzkaller.appspot.com/bug?extid=96ff6cfc4551fcc29342 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a57828100000 The bug was bisected to: commit 386d4716fd91869e07c731657f2cde5a33086516 Author: Luo bin Date: Thu Feb 27 06:34:44 2020 +0000 hinic: fix a bug of rss configuration bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16626fcfe00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=15626fcfe00000 console output: https://syzkaller.appspot.com/x/log.txt?x=11626fcfe00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+96ff6cfc4551fcc29342@syzkaller.appspotmail.com Fixes: 386d4716fd91 ("hinic: fix a bug of rss configuration") INFO: task kworker/1:5:2724 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. kworker/1:5 D27416 2724 2 0x80004000 Workqueue: events linkwatch_event Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 linkwatch_event+0xb/0x60 net/core/link_watch.c:242 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task syz-executor.0:7053 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.0 D23512 7053 1 0x80004006 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 flush_all_backlogs net/core/dev.c:5527 [inline] rollback_registered_many+0x562/0xe70 net/core/dev.c:8813 rollback_registered+0xf2/0x1c0 net/core/dev.c:8873 unregister_netdevice_queue net/core/dev.c:9969 [inline] unregister_netdevice_queue+0x1d7/0x2b0 net/core/dev.c:9962 unregister_netdevice include/linux/netdevice.h:2725 [inline] __tun_detach+0xe42/0x1110 drivers/net/tun.c:690 tun_detach drivers/net/tun.c:707 [inline] tun_chr_close+0xd9/0x180 drivers/net/tun.c:3413 __fput+0x33e/0x880 fs/file_table.c:280 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xb34/0x2dd0 kernel/exit.c:795 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x47b/0x24e0 kernel/signal.c:2739 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x4166ca Code: Bad RIP value. RSP: 002b:00007ffd4022d478 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000001d60940 RCX: 00000000004166ca RDX: 0000000040000000 RSI: 00007ffd4022d4b0 RDI: ffffffffffffffff RBP: 0000000000002996 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00007ffd4022d4b0 R14: 0000000001d6099b R15: 00007ffd4022d4c0 Showing all locks held in the system: 1 lock held by khungtaskd/1125: #0: ffffffff899beb00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 3 locks held by kworker/1:5/2724: #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90008367dc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a582268 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:242 1 lock held by in:imklog/6717: #0: ffff888098d271b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by syz-executor.0/7053: #0: ffffffff8a582268 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:704 [inline] #0: ffffffff8a582268 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3413 #1: ffffffff89979ad0 (cpu_hotplug_lock){++++}-{0:0}, at: get_online_cpus include/linux/cpu.h:143 [inline] #1: ffffffff89979ad0 (cpu_hotplug_lock){++++}-{0:0}, at: flush_all_backlogs net/core/dev.c:5520 [inline] #1: ffffffff89979ad0 (cpu_hotplug_lock){++++}-{0:0}, at: rollback_registered_many+0x45b/0xe70 net/core/dev.c:8813 3 locks held by kworker/1:6/14336: #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff88809ace8d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90004637dc0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a582268 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4584 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1125 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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 28894 Comm: syz-executor.0 Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_ring_ctx_wait_and_kill+0x98/0x5e0 fs/io_uring.c:7329 Code: 01 00 00 4d 89 f4 48 b8 00 00 00 00 00 fc ff df 4c 89 ed 49 c1 ec 03 48 c1 ed 03 49 01 c4 48 01 c5 eb 1c e8 6a f2 9d ff f3 90 <41> 80 3c 24 00 0f 85 b0 04 00 00 48 83 bb 10 01 00 00 00 74 21 e8 RSP: 0018:ffffc90004e17a48 EFLAGS: 00000293 RAX: ffff888091758480 RBX: ffff888094860000 RCX: 1ffff920009c2f36 RDX: 0000000000000000 RSI: ffffffff81d53c26 RDI: ffff888094860300 RBP: ffffed101290c02c R08: 0000000000000001 R09: ffffed101290c061 R10: ffff888094860307 R11: ffffed101290c060 R12: ffffed101290c022 R13: ffff888094860160 R14: ffff888094860110 R15: ffffffff81d54170 FS: 00007fac6c1a8700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560ad6a654a7 CR3: 0000000009879000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_uring_release+0x3e/0x50 fs/io_uring.c:7352 __fput+0x33e/0x880 fs/file_table.c:280 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xb34/0x2dd0 kernel/exit.c:795 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x47b/0x24e0 kernel/signal.c:2739 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007fac6c1a7c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: 0000000000000003 RBX: 00000000004e0bc0 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 00000000000000f1 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000204 R14: 00000000004c425f R15: 00007fac6c1a86d4 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches