INFO: task syz-executor.1:14965 blocked for more than 143 seconds. Not tainted 5.11.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28944 pid:14965 ppid: 8479 flags:0x00004004 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:7375 [inline] io_sq_thread_park fs/io_uring.c:7369 [inline] io_uring_cancel_task_requests fs/io_uring.c:8855 [inline] __io_uring_files_cancel+0x2c2/0x14f0 fs/io_uring.c:8963 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+0x3ec/0x2010 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+0x148/0x250 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: 0033:0x45e219 RSP: 002b:00007fb08846ccf8 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: 00007ffdf896679f R14: 00007fb08846d9c0 R15: 000000000119bf8c Showing all locks held in the system: 1 lock held by khungtaskd/1648: #0: ffffffff8b363820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8151: #0: ffff888013d27df0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 1 lock held by syz-executor.1/14965: #0: ffff88801e7f0070 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7374 [inline] #0: ffff88801e7f0070 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7369 [inline] #0: ffff88801e7f0070 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests fs/io_uring.c:8855 [inline] #0: ffff88801e7f0070 (&sqd->lock){+.+.}-{3:3}, at: __io_uring_files_cancel+0x2a4/0x14f0 fs/io_uring.c:8963 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-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: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: 4882 Comm: systemd-journal Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__seccomp_filter+0x76/0x1610 kernel/seccomp.c:1157 Code: 24 38 50 f1 72 81 c7 00 f1 f1 f1 f1 c7 40 04 f1 f1 00 00 c7 40 0c f2 f2 f2 f2 c7 40 18 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 <48> 89 84 24 20 01 00 00 31 c0 e8 2b 86 ff ff 0f ae e8 4d 85 ff 0f RSP: 0018:ffffc90001617d90 EFLAGS: 00000286 RAX: 0b4a5c1b068c0400 RBX: ffffc90001617f58 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000027 RBP: dffffc0000000000 R08: ffffffff894fff00 R09: ffffffff817332ca R10: 0000000000000002 R11: 0000000000000002 R12: 0000000000000027 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f10e17ed8c0(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f10decf0028 CR3: 0000000014cb6000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __secure_computing+0xfc/0x360 kernel/seccomp.c:1307 syscall_trace_enter.constprop.0+0x94/0x260 kernel/entry/common.c:67 do_syscall_64+0xf/0x70 arch/x86/entry/common.c:41 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f10e0a86f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007fff41963b28 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 000056107de39200 RCX: 00007f10e0a86f17 RDX: 00007fff41963be0 RSI: 0000000000000000 RDI: 000056107de39200 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007fff41963be0 R13: 0000000000001312 R14: 00007fff419669d0 R15: 00007fff41963fe0