INFO: task syz-executor.0:13358 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-next-20210120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28944 pid:13358 ppid: 8455 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4373 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5124 schedule+0xcf/0x270 kernel/sched/core.c:5203 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 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:7448 [inline] io_sq_thread_park fs/io_uring.c:7442 [inline] io_uring_cancel_task_requests fs/io_uring.c:8971 [inline] __io_uring_files_cancel+0x2d5/0xfe0 fs/io_uring.c:9066 io_uring_files_cancel include/linux/io_uring.h:51 [inline] do_exit+0x2fe/0x2ae0 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x3e9/0x20a0 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:150 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:301 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:312 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f7944d47cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000119bf88 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119bf88 RBP: 000000000119bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffe27fe621f R14: 00007f7944d489c0 R15: 000000000119bf8c Showing all locks held in the system: 3 locks held by kworker/u4:0/9: #0: ffff8880b9e34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1322 [inline] #0: ffff8880b9e34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:5041 #1: ffffc90000ce7da8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 #2: ffff8880b9e24918 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:944 1 lock held by khungtaskd/1664: #0: ffffffff8b370ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6326 1 lock held by in:imklog/8139: #0: ffff88801164d270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by systemd-journal/9012: 1 lock held by syz-executor.0/13358: #0: ffff8880123e8c70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7447 [inline] #0: ffff8880123e8c70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7442 [inline] #0: ffff8880123e8c70 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests fs/io_uring.c:8971 [inline] #0: ffff8880123e8c70 (&sqd->lock){+.+.}-{3:3}, at: __io_uring_files_cancel+0x2b8/0xfe0 fs/io_uring.c:9066 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1664 Comm: khungtaskd Not tainted 5.11.0-rc4-next-20210120-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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9012 Comm: systemd-journal Not tainted 5.11.0-rc4-next-20210120-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7fdf46ac8d80 Code: 00 48 8d 35 ca e8 0e 00 48 8d 3d de 22 0e 00 ba 11 02 00 00 e8 c1 62 fe ff e8 bc 61 fe ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <48> 85 ff 74 0b 8b 07 85 c0 74 15 83 c0 01 89 07 48 89 f8 c3 66 90 RSP: 002b:00007ffd6b9ec2e8 EFLAGS: 00000202 RAX: 000055b5d42b1780 RBX: 000055b5d42b11e0 RCX: 00007fdf46141f17 RDX: 0000000000000000 RSI: 000000006b56e783 RDI: 000055b5d42b11e0 RBP: 000055b5d42b1780 R08: 000055b5d42b32e8 R09: 000055b5d42b17b8 R10: 000055b5d42b1780 R11: 0000000000000202 R12: ffffffffffffffff R13: 00007ffd6b9ec398 R14: 000055b5d306e958 R15: 0005b957cfc322da FS: 00007fdf46ea88c0 GS: 0000000000000000