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X-Received: by 2002:a5d:4d4c:: with SMTP id a12mr2906503wru.154.1612177666912; Mon, 01 Feb 2021 03:07:46 -0800 (PST) Received: from [192.168.8.166] ([185.69.145.241]) by smtp.gmail.com with ESMTPSA id a27sm26243131wrc.94.2021.02.01.03.07.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Feb 2021 03:07:46 -0800 (PST) Subject: Re: WARNING in io_disable_sqo_submit To: syzbot , axboe@kernel.dk, hdanton@sina.com, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk References: <00000000000042c22b05b92c1b44@google.com> From: Pavel Begunkov Autocrypt: addr=asml.silence@gmail.com; prefer-encrypt=mutual; keydata= mQINBFmKBOQBEAC76ZFxLAKpDw0bKQ8CEiYJRGn8MHTUhURL02/7n1t0HkKQx2K1fCXClbps bdwSHrhOWdW61pmfMbDYbTj6ZvGRvhoLWfGkzujB2wjNcbNTXIoOzJEGISHaPf6E2IQx1ik9 6uqVkK1OMb7qRvKH0i7HYP4WJzYbEWVyLiAxUj611mC9tgd73oqZ2pLYzGTqF2j6a/obaqha 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<39ebb181-6760-cdfd-88f8-5578ad4d7c85@gmail.com> Date: Mon, 1 Feb 2021 11:04:04 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <00000000000042c22b05b92c1b44@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 18/01/2021 12:46, syzbot wrote: > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > INFO: task hung in io_sq_thread_stop #syz test: git://git.kernel.dk/linux-block for-5.12/io_uring > INFO: task kworker/u4:0:8 blocked for more than 143 seconds. > Not tainted 5.11.0-rc1-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:kworker/u4:0 state:D stack:24056 pid: 8 ppid: 2 flags:0x00004000 > Workqueue: events_unbound io_ring_exit_work > Call Trace: > context_switch kernel/sched/core.c:4313 [inline] > __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 > schedule+0xcf/0x270 kernel/sched/core.c:5143 > schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1854 > 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+0x163/0x260 kernel/sched/completion.c:138 > kthread_park+0x122/0x1b0 kernel/kthread.c:557 > io_sq_thread_park fs/io_uring.c:7445 [inline] > io_sq_thread_park fs/io_uring.c:7439 [inline] > io_sq_thread_stop+0xfe/0x570 fs/io_uring.c:7463 > io_finish_async fs/io_uring.c:7481 [inline] > io_ring_ctx_free fs/io_uring.c:8646 [inline] > io_ring_exit_work+0x62/0x6d0 fs/io_uring.c:8739 > process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 > worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 > kthread+0x3b1/0x4a0 kernel/kthread.c:292 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 > > Showing all locks held in the system: > 3 locks held by kworker/u4:0/8: > #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] > #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] > #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] > #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] > #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246 > #1: ffffc90000cd7da8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 > #2: ffff88801bfd4870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7444 [inline] > #2: ffff88801bfd4870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7439 [inline] > #2: ffff88801bfd4870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_stop+0xd6/0x570 fs/io_uring.c:7463 > 1 lock held by khungtaskd/1647: > #0: ffffffff8b373aa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 > 1 lock held by in:imklog/8164: > #0: ffff8880151b8870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 > 2 locks held by kworker/u4:6/8415: > 2 locks held by kworker/0:4/8690: > #0: ffff88801007c538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff88801007c538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] > #0: ffff88801007c538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] > #0: ffff88801007c538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] > #0: ffff88801007c538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] > #0: ffff88801007c538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246 > #1: ffffc9000288fda8 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 > 1 lock held by syz-executor.3/8865: > #0: ffff888146ddcd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 > 1 lock held by syz-executor.2/8867: > #0: ffff888146ddcd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 > 2 locks held by syz-executor.5/8869: > #0: ffff888146ddcd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 > #1: ffffffff8b37c368 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] > #1: ffffffff8b37c368 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f2/0x610 kernel/rcu/tree_exp.h:836 > 1 lock held by syz-executor.4/8870: > #0: ffff888146ddcd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 > 1 lock held by syz-executor.0/8872: > #0: ffff888146ddcd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 > 1 lock held by syz-executor.1/8873: > #0: ffff888146ddcd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 > > ============================================= > > NMI backtrace for cpu 1 > CPU: 1 PID: 1647 Comm: khungtaskd Not tainted 5.11.0-rc1-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+0x107/0x163 lib/dump_stack.c:120 > 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+0xd43/0xfa0 kernel/hung_task.c:294 > kthread+0x3b1/0x4a0 kernel/kthread.c:292 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 PID: 8415 Comm: kworker/u4:6 Not tainted 5.11.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Workqueue: bat_events batadv_nc_worker > RIP: 0010:__this_cpu_preempt_check+0xd/0x20 lib/smp_processor_id.c:70 > Code: 00 00 48 c7 c6 00 d9 9e 89 48 c7 c7 40 d9 9e 89 e9 98 fe ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 0f 1f 44 00 00 48 89 ee 5d <48> c7 c7 80 d9 9e 89 e9 77 fe ff ff cc cc cc cc cc cc cc 0f 1f 44 > RSP: 0018:ffffc9000c507af0 EFLAGS: 00000046 > RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff1a077ab > RDX: 0000000000000000 RSI: ffffffff894bac40 RDI: ffffffff894bac40 > RBP: ffffffff8b3739e0 R08: 0000000000000000 R09: ffffffff8d038b8f > R10: fffffbfff1a07171 R11: 0000000000000000 R12: 0000000000000001 > R13: ffff88802f858bc0 R14: 00000000ffffffff R15: ffffffff889a5430 > FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fbcc03ca000 CR3: 0000000011523000 CR4: 0000000000350ef0 > Call Trace: > lockdep_recursion_inc kernel/locking/lockdep.c:432 [inline] > lock_is_held_type+0x34/0x100 kernel/locking/lockdep.c:5475 > lock_is_held include/linux/lockdep.h:271 [inline] > rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:123 > trace_lock_release include/trace/events/lock.h:58 [inline] > lock_release+0x5b7/0x710 kernel/locking/lockdep.c:5448 > __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] > _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:207 > spin_unlock_bh include/linux/spinlock.h:399 [inline] > batadv_nc_purge_paths+0x2a5/0x3a0 net/batman-adv/network-coding.c:467 > batadv_nc_worker+0x831/0xe50 net/batman-adv/network-coding.c:716 > process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 > worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 > kthread+0x3b1/0x4a0 kernel/kthread.c:292 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 > > > Tested on: > > commit: a1235e44 io_uring: cancel all requests on task exit > git tree: git://git.kernel.dk/linux-block io_uring-5.11 > console output: https://syzkaller.appspot.com/x/log.txt?x=10c53584d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c6b6b5cccb0f38f2 > dashboard link: https://syzkaller.appspot.com/bug?extid=2f5d1785dc624932da78 > compiler: gcc (GCC) 10.1.0-syz 20200507 > -- Pavel Begunkov