INFO: task syz-executor.1:12428 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28280 pid:12428 ppid: 8502 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:7408 [inline] io_sq_thread_park fs/io_uring.c:7402 [inline] io_uring_cancel_task_requests fs/io_uring.c:8909 [inline] __io_uring_files_cancel+0x2d5/0xfe0 fs/io_uring.c:9004 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: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:00007f2966f4fcf8 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: 00007fff528167af R14: 00007f2966f509c0 R15: 000000000119bf8c Showing all locks held in the system: 1 lock held by khungtaskd/1644: #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by systemd-journal/4881: 1 lock held by in:imklog/8173: #0: ffff88801b230370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 1 lock held by syz-executor.1/12428: #0: ffff8880319c9070 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7407 [inline] #0: ffff8880319c9070 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7402 [inline] #0: ffff8880319c9070 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests fs/io_uring.c:8909 [inline] #0: ffff8880319c9070 (&sqd->lock){+.+.}-{3:3}, at: __io_uring_files_cancel+0x2b8/0xfe0 fs/io_uring.c:9004 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1644 Comm: khungtaskd Not tainted 5.11.0-rc3-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4881 Comm: systemd-journal Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:164 [inline] RIP: 0010:check_preemption_disabled+0x4d/0x150 lib/smp_processor_id.c:19 Code: e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44 00 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 44 00 00 9c 5b <81> e3 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 74 d3 0f RSP: 0018:ffffc900016a7f00 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000046 RCX: 1ffffffff1a06d01 RDX: 1ffff110029f659c RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff899e8020 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff817898be R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff894bab40 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1d79db18c0(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd164bbf000 CR3: 0000000014611000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_inc kernel/locking/lockdep.c:432 [inline] lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4097 [inline] lockdep_hardirqs_on_prepare+0x118/0x400 kernel/locking/lockdep.c:4050 __exit_to_user_mode kernel/entry/common.c:126 [inline] syscall_exit_to_user_mode+0x28/0x50 kernel/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f1d7904af17 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:00007fff4667b128 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 RAX: 0000000000001311 RBX: 0000564231dfb200 RCX: 00007f1d7904af17 RDX: 00000000ffffffff RSI: 00007fff4667b1b0 RDI: 0000564231dfb200 RBP: 0000000000001311 R08: 0000564231e04b70 R09: 00007fff467b8080 R10: 0000000000012e18 R11: 0000000000000206 R12: 00007fff4667b1b0 R13: 00007fff4667b1a8 R14: 0000564230734958 R15: 0005b8de352f7251