rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10502 ticks this GP) idle=943/1/0x4000000000000000 softirq=377276/377279 fqs=5182 (t=10502 jiffies g=647753 q=73118) NMI backtrace for cpu 1 CPU: 1 PID: 6704 Comm: syz-executor.0 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_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3878 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 9e 6d 22 f8 48 89 ef e8 e6 e3 22 f8 e8 b1 7f 43 f8 fb bf 01 00 00 00 96 ab 15 f8 65 8b 05 6f 42 c8 76 85 c0 74 02 5d c3 0f 1f 44 00 RSP: 0018:ffffc90000dc0e08 EFLAGS: 00000206 RAX: 00000000010cede4 RBX: ffffffff87514c40 RCX: 1ffffffff1fa7f96 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001 RBP: ffff8880b9d28280 R08: 0000000000000001 R09: ffffffff8fd38a17 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90000dc0e98 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9d28280 expire_timers kernel/time/timer.c:1465 [inline] __run_timers.part.0+0x665/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:finish_task_switch.isra.0+0x323/0xb80 kernel/sched/core.c:4849 Code: 63 cc e6 07 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 27 29 2d 00 fb 65 48 8b 1c 25 40 70 02 00 <48> 8d bb 80 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc90002bff488 EFLAGS: 00000202 RAX: 00000000000f65e9 RBX: ffff88801da30000 RCX: 1ffffffff1fa7f96 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002bff4d0 R08: 0000000000000001 R09: ffffffff8fd38a17 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b9d3a7d8 R13: ffff888032758000 R14: ffff8880b9d39a80 R15: ffff8880b9d3a4b8 context_switch kernel/sched/core.c:4972 [inline] __schedule+0xaa2/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 synchronize_rcu_expedited+0x471/0x620 kernel/rcu/tree_exp.h:852 synchronize_rcu+0x132/0x190 kernel/rcu/tree.c:3744 hci_conn_hash_del include/net/bluetooth/hci_core.h:932 [inline] hci_conn_cleanup+0x177/0x6c0 net/bluetooth/hci_conn.c:123 hci_conn_del+0x2a0/0x790 net/bluetooth/hci_conn.c:806 hci_conn_hash_flush+0x19c/0x260 net/bluetooth/hci_conn.c:1743 hci_dev_do_close+0x57d/0x1150 net/bluetooth/hci_core.c:1672 hci_unregister_dev+0x1c8/0x5b0 net/bluetooth/hci_core.c:3915 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:462 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xbaa/0x2a20 kernel/exit.c:826 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47d/0x21d0 kernel/signal.c:2855 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: 0033:0x7ff3ecd2cae9 Code: Unable to access opcode bytes at RIP 0x7ff3ecd2cabf. RSP: 002b:00007ff3ea281218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007ff3ece40028 RCX: 00007ff3ecd2cae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff3ece40028 RBP: 00007ff3ece40020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff3ece4002c R13: 00007ffd738ef45f R14: 00007ff3ea281300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 55 push %rbp 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fd mov %rdi,%rbp e: 48 83 c7 18 add $0x18,%rdi 12: e8 9e 6d 22 f8 callq 0xf8226db5 17: 48 89 ef mov %rbp,%rdi 1a: e8 e6 e3 22 f8 callq 0xf822e405 1f: e8 b1 7f 43 f8 callq 0xf8437fd5 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 96 ab 15 f8 callq 0xf815abc5 <-- trapping instruction 2f: 65 8b 05 6f 42 c8 76 mov %gs:0x76c8426f(%rip),%eax # 0x76c842a5 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5d pop %rbp 3b: c3 retq 3c: 0f .byte 0xf 3d: 1f (bad) 3e: 44 rex.R