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,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 C27C6C11F66 for ; Wed, 30 Jun 2021 22:20:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98AAD61476 for ; Wed, 30 Jun 2021 22:20:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233026AbhF3WWl (ORCPT ); Wed, 30 Jun 2021 18:22:41 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:54962 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232459AbhF3WWk (ORCPT ); Wed, 30 Jun 2021 18:22:40 -0400 Received: by mail-io1-f71.google.com with SMTP id m14-20020a5d898e0000b02904f7957d92b5so2815426iol.21 for ; Wed, 30 Jun 2021 15:20:10 -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:in-reply-to:message-id:subject :from:to; bh=OABFmw0CVWE1q/Eyqu/mp46ORWo/pibHtpFXOujzctg=; b=iMBSSQfTWw/FseA53LqiiqzPgGUSvgHb7YtukTWckSDZ/47ueictfWX3IuMlbPqAzL htG/BP8DxLn9zGmPd/305s0pfI+zdwL3qsn5OgsnubG4OKwUmyGBLSWfjI2Gi7Ip127o iDAtveX3CambxO+4PbpmsSemwvrG6+EaLHW8Yad15ER6zI2iV44niuwzKUxB3qqUnNEt 5NqAsx1Ym+r7+z/E6Llb9oQUwIwdO6rnNJdn6Xw+6qYI5gFrY1nk5Z3lFiSbLFWx6ybT ZsKFvU49GgU3D2Y3zv+V5SqtUqpxL6ciK4gmUK+sAo5bD82d+x+7MDAYk6f3KJ6bUqnt A4/Q== X-Gm-Message-State: AOAM531sW1hWb2uR89OFzsFbfIT9IQgbVtq4GSUs6Na01oo/qyXxgkpa dlwtUtcohedLKx0PLjDquLSVXVfnEj9AR37i2voy0GZsug+N X-Google-Smtp-Source: ABdhPJz4wIMT6pofrTdOopOzuBSDPKTQJSFL3Zyj9vqkaM8AGX+UVH+3rKt/oAT9QzenEYX9oi/XMeGCwYzQGJrvkWitDhXdy283 MIME-Version: 1.0 X-Received: by 2002:a6b:3c01:: with SMTP id k1mr9459738iob.24.1625091610713; Wed, 30 Jun 2021 15:20:10 -0700 (PDT) Date: Wed, 30 Jun 2021 15:20:10 -0700 In-Reply-To: <20210701010032.4046a863@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002f235305c6032007@google.com> Subject: Re: [syzbot] possible deadlock in vmci_qp_broker_detach From: syzbot To: alex.dewar90@gmail.com, arnd@arndb.de, gregkh@linuxfoundation.org, hdanton@sina.com, jhansen@vmware.com, linux-kernel@vger.kernel.org, paskripkin@gmail.com, snovitoll@gmail.com, syzkaller-bugs@googlegroups.com, vdasa@vmware.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in vmci_ctx_destroy INFO: task syz-executor.1:10566 blocked for more than 143 seconds. Not tainted 5.13.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28336 pid:10566 ppid: 8853 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0xb39/0x5980 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 vmci_ctx_destroy+0x2db/0x3b0 drivers/misc/vmw_vmci/vmci_context.c:197 vmci_host_close+0xef/0x170 drivers/misc/vmw_vmci/vmci_host.c:144 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f09abe44188 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000005 RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcea410a5f R14: 00007f09abe44300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1641: #0: ffffffff8b77d7c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/8286: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1641 Comm: khungtaskd Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd4b/0xfb0 kernel/hung_task.c:294 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:write_comp_data kernel/kcov.c:218 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x17/0x70 kernel/kcov.c:284 Code: 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 4c 8b 14 24 89 f1 65 48 8b 34 25 00 f0 01 00 54 f0 ff ff 84 c0 74 4b 48 8b 86 40 15 00 00 8b b6 3c 15 00 00 RSP: 0018:ffffc90000ca7b28 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: ffff88813fec8000 RSI: ffff88813fec8000 RDI: 0000000000000003 RBP: ffff8880109b1e48 R08: 0000000000000000 R09: ffff8880109b1e4b R10: ffffffff817c6c69 R11: 0000000077db5095 R12: 0000000000000002 R13: ffffc90000ca7bb0 R14: 1ffff92000194f72 R15: 0000000000000022 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdc1cf12000 CR3: 0000000036471000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x19/0x1c0 kernel/trace/trace_preemptirq.c:42 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191 crng_backtrack_protect drivers/char/random.c:1053 [inline] _get_random_bytes+0x295/0x670 drivers/char/random.c:1540 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:540 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x740/0xbd0 drivers/net/netdevsim/dev.c:611 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Tested on: commit: 44046219 Merge tag 'for-5.14/drivers-2021-06-29' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17e7bbdc300000 kernel config: https://syzkaller.appspot.com/x/.config?x=efdd5c8b8b556274 dashboard link: https://syzkaller.appspot.com/bug?extid=44e40ac2cfe68e8ce207 compiler: patch: https://syzkaller.appspot.com/x/patch.diff?x=134eb1e8300000