INFO: task syz-executor791:20377 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor791 state:D stack:28152 pid:20377 ppid: 8418 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 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+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1162 [inline] io_wq_put_and_exit+0x40c/0xc70 fs/io-wq.c:1197 io_uring_clean_tctx fs/io_uring.c:9607 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9687 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 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:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445ef9 RSP: 002b:00007f6a9bec7218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000004cb448 RCX: 0000000000445ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cb448 RBP: 00000000004cb440 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cb44c R13: 00007fffc2b7a79f R14: 00007f6a9bec7300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1608: #0: ffffffff8b97cf20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by in:imklog/8149: #0: ffff888020ba3af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffffffff8b97cf20 (rcu_read_lock){....}-{1:2}, at: syslog_print+0x105/0x580 kernel/printk/printk.c:1493 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1608 Comm: khungtaskd Not tainted 5.14.0-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:105 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+0x3e5/0x4d0 kernel/kthread.c:319 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: 58 Comm: kworker/u4:3 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:preempt_count_add+0x7/0x140 kernel/sched/core.c:5390 Code: e9 3f ff ff ff e8 b9 35 6d 00 e9 cf fe ff ff e8 1f 36 6d 00 e9 f9 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c0 a0 78 25 90 <55> 48 ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 89 fb 48 c1 RSP: 0018:ffffc900011b7a08 EFLAGS: 00000246 RAX: ffffffff902578a0 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 1ffffffff170912c RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffffff8b848900 R08: ffffffff812a0f68 R09: ffffffff90277b83 R10: ffffffff8198c6f0 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6dc62b000 CR3: 000000000b68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock_common kernel/locking/mutex.c:595 [inline] __mutex_lock+0x10c/0x12f0 kernel/locking/mutex.c:729 arch_jump_label_transform_queue+0x58/0x100 arch/x86/kernel/jump_label.c:136 __jump_label_update+0x12e/0x400 kernel/jump_label.c:451 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:637 [inline] toggle_allocation_gate+0x185/0x390 mm/kfence/core.c:615 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: e9 3f ff ff ff jmpq 0xffffff44 5: e8 b9 35 6d 00 callq 0x6d35c3 a: e9 cf fe ff ff jmpq 0xfffffede f: e8 1f 36 6d 00 callq 0x6d3633 14: e9 f9 fe ff ff jmpq 0xffffff12 19: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 20: 00 00 00 23: 48 c7 c0 a0 78 25 90 mov $0xffffffff902578a0,%rax * 2a: 55 push %rbp <-- trapping instruction 2b: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 32: fc ff df 35: 48 89 c1 mov %rax,%rcx 38: 53 push %rbx 39: 83 e0 07 and $0x7,%eax 3c: 89 fb mov %edi,%ebx 3e: 48 rex.W 3f: c1 .byte 0xc1