INFO: task syz-executor.3:15644 blocked for more than 143 seconds. Not tainted 5.10.0-rc7-next-20201208-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28224 pid:15644 ppid: 8551 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 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:7340 [inline] io_sq_thread_park fs/io_uring.c:7334 [inline] io_uring_cancel_task_requests fs/io_uring.c:8813 [inline] __io_uring_files_cancel+0x2c2/0x1550 fs/io_uring.c:8917 io_uring_files_cancel include/linux/io_uring.h:51 [inline] exit_files+0xe4/0x170 fs/file.c:431 do_exit+0xb4f/0x2a00 kernel/exit.c:818 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3e9/0x2160 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 RSP: 002b:00007ff8a143ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 000000000119bf88 RCX: 000000000045e159 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119bf88 RBP: 000000000119bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffcb107f07f R14: 00007ff8a143d9c0 R15: 000000000119bf8c Showing all locks held in the system: 2 locks held by kworker/u4:2/28: #0: ffff8880b9c34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1318 [inline] #0: ffff8880b9c34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x235/0x21b0 kernel/sched/core.c:4993 #1: ffffc90000e2fda8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2250 1 lock held by khungtaskd/1659: #0: ffffffff8b78db60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8211: #0: ffff88801841fc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:923 4 locks held by kworker/1:5/9979: #0: ffff8880b9d34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1318 [inline] #0: ffff8880b9d34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x235/0x21b0 kernel/sched/core.c:4993 #1: ffff8880b9d20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 #2: ffffffff8b78db00 (rcu_read_lock_bh){....}-{1:2}, at: wg_packet_create_data_done drivers/net/wireguard/send.c:258 [inline] #2: ffffffff8b78db00 (rcu_read_lock_bh){....}-{1:2}, at: wg_packet_tx_worker+0x376/0xa20 drivers/net/wireguard/send.c:280 #3: ffffffff8b78db60 (rcu_read_lock){....}-{1:2}, at: ip6_input_finish+0x0/0x1a0 net/ipv6/ip6_input.c:375 1 lock held by syz-executor.3/15644: #0: ffff88801ab62470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7339 [inline] #0: ffff88801ab62470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7334 [inline] #0: ffff88801ab62470 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests fs/io_uring.c:8813 [inline] #0: ffff88801ab62470 (&sqd->lock){+.+.}-{3:3}, at: __io_uring_files_cancel+0x2a4/0x1550 fs/io_uring.c:8917 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.10.0-rc7-next-20201208-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+0x3c/0xef lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xe75/0x1020 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9955 Comm: kworker/u4:5 Not tainted 5.10.0-rc7-next-20201208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: 0x0 (bat_events) RIP: 0010:lockdep_hardirqs_off+0xba/0xd0 kernel/locking/lockdep.c:4201 Code: 65 48 8b 2c 25 00 f0 01 00 8b 85 28 09 00 00 48 89 9d 38 09 00 00 65 c7 05 6b 4a ec 76 00 00 00 00 83 c0 01 89 85 28 09 00 00 <89> 85 44 09 00 00 5b 5d c3 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 RSP: 0018:ffffc9001688fe08 EFLAGS: 00000006 RAX: 0000000000ab34fc RBX: ffffffff89181641 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888070edb600 R08: 0000000000000000 R09: ffff888070edb607 R10: ffffffff81491de8 R11: 0000000000000001 R12: ffff888071e41658 R13: ffff88801af8cc00 R14: 0000000000000000 R15: ffff888010869800 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5fe66ef000 CR3: 0000000011d96000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_off+0x13/0x1b0 kernel/trace/trace_preemptirq.c:76 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_irq+0x41/0x50 kernel/locking/spinlock.c:167 worker_thread+0x159/0x1120 kernel/workqueue.c:2371 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296