INFO: task syz-executor.0:21791 blocked for more than 143 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27560 pid:21791 ppid: 6510 flags:0x00024006 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 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+0x174/0x270 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1204 [inline] io_wq_put_and_exit+0x33a/0xb70 fs/io-wq.c:1239 io_uring_clean_tctx fs/io_uring.c:9774 [inline] io_uring_cancel_generic+0x61d/0x690 fs/io_uring.c:9855 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x60c/0x2b40 kernel/exit.c:787 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x21d0 kernel/signal.c:2820 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f4bd25a6ae9 RSP: 002b:00007f4bcfb1c188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000302 RBX: 00007f4bd26b9f60 RCX: 00007f4bd25a6ae9 RDX: 0000000000000000 RSI: 0000000000000302 RDI: 0000000000000006 RBP: 00007f4bd2600f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4bd2bedb2f R14: 00007f4bcfb1c300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:1/10: 1 lock held by khungtaskd/27: #0: ffffffff8b983960 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6174: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 30970 Comm: kworker/u4:6 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:hlock_class kernel/locking/lockdep.c:199 [inline] RIP: 0010:mark_lock+0xf7/0x17b0 kernel/locking/lockdep.c:4571 Code: 66 81 e2 ff 1f 44 0f b7 f2 be 08 00 00 00 4c 89 f0 48 c1 f8 06 48 8d 3c c5 00 ea d3 8f e8 51 e4 61 00 4c 0f a3 35 99 8b 77 0e <0f> 83 03 01 00 00 4b 8d 04 76 48 c1 e0 06 48 05 20 ee d3 8f 48 8d RSP: 0018:ffffc9000521f638 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 1ffff92000a43ece RCX: ffffffff815c5e5f RDX: fffffbfff1fa7d43 RSI: 0000000000000008 RDI: ffffffff8fd3ea10 RBP: 0000000000000004 R08: 0000000000000000 R09: ffffffff8fd3ea17 R10: fffffbfff1fa7d42 R11: 000000000000003f R12: 0000000000000002 R13: ffff88807e660b28 R14: 0000000000000090 R15: ffff88807e660b48 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa1af5ab000 CR3: 000000000b68e000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4502 [inline] __lock_acquire+0x844/0x54a0 kernel/locking/lockdep.c:4969 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] __get_locked_pte+0x2b6/0x4d0 mm/memory.c:1736 get_locked_pte include/linux/mm.h:2180 [inline] __text_poke+0x1ab/0x8c0 arch/x86/kernel/alternative.c:1000 text_poke_bp_batch+0x2eb/0x560 arch/x86/kernel/alternative.c:1310 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline] text_poke_flush arch/x86/kernel/alternative.c:1448 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate mm/kfence/core.c:640 [inline] toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:618 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 66 81 e2 ff 1f and $0x1fff,%dx 5: 44 0f b7 f2 movzwl %dx,%r14d 9: be 08 00 00 00 mov $0x8,%esi e: 4c 89 f0 mov %r14,%rax 11: 48 c1 f8 06 sar $0x6,%rax 15: 48 8d 3c c5 00 ea d3 lea -0x702c1600(,%rax,8),%rdi 1c: 8f 1d: e8 51 e4 61 00 callq 0x61e473 22: 4c 0f a3 35 99 8b 77 bt %r14,0xe778b99(%rip) # 0xe778bc3 29: 0e * 2a: 0f 83 03 01 00 00 jae 0x133 <-- trapping instruction 30: 4b 8d 04 76 lea (%r14,%r14,2),%rax 34: 48 c1 e0 06 shl $0x6,%rax 38: 48 05 20 ee d3 8f add $0xffffffff8fd3ee20,%rax 3e: 48 rex.W 3f: 8d .byte 0x8d