================================ WARNING: inconsistent lock state 6.1.0-rc4-syzkaller-00212-g064bc7312bd0-dirty #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. swapper/0/0 [HC0[0]:SC1[3]:HE1:SE0] takes: ffff888145ea44f8 (k-clock-AF_INET){++?.}-{2:2}, at: l2tp_tunnel_destruct+0xe6/0x2d0 net/l2tp/l2tp_core.c:1153 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_write_lock include/linux/rwlock_api_smp.h:209 [inline] _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300 l2tp_tunnel_register+0xc61/0x1200 net/l2tp/l2tp_core.c:1509 l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 net/l2tp/l2tp_netlink.c:245 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x445/0x780 net/netlink/genetlink.c:850 netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540 genl_rcv+0x28/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd irq event stamp: 5256464 hardirqs last enabled at (5256464): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (5256464): [] _raw_spin_unlock_irqrestore+0x54/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (5256463): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (5256463): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (5256370): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (5256370): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (5256383): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (5256383): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(k-clock-AF_INET); lock(k-clock-AF_INET); *** DEADLOCK *** 1 lock held by swapper/0/0: #0: ffffffff8c58fc60 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2239 [inline] #0: ffffffff8c58fc60 (rcu_callback){....}-{0:0}, at: rcu_core+0x7ab/0x1980 kernel/rcu/tree.c:2510 stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.0-rc4-syzkaller-00212-g064bc7312bd0-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3963 [inline] valid_state kernel/locking/lockdep.c:3975 [inline] mark_lock_irq kernel/locking/lockdep.c:4178 [inline] mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4634 mark_lock kernel/locking/lockdep.c:4598 [inline] mark_usage kernel/locking/lockdep.c:4529 [inline] __lock_acquire+0x11d9/0x56d0 kernel/locking/lockdep.c:5009 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x33/0x40 kernel/locking/spinlock.c:334 l2tp_tunnel_destruct+0xe6/0x2d0 net/l2tp/l2tp_core.c:1153 __sk_destruct+0x51/0x710 net/core/sock.c:2122 rcu_do_batch kernel/rcu/tree.c:2250 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2510 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:113 [inline] RIP: 0010:acpi_idle_do_entry+0x1fd/0x2a0 drivers/acpi/processor_idle.c:572 Code: 89 de e8 66 ac 8b f7 84 db 75 ac e8 ed af 8b f7 e8 78 30 92 f7 eb 0c e8 e1 af 8b f7 0f 00 2d 7a 63 be 00 e8 d5 af 8b f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 90 ac 8b f7 48 85 db RSP: 0018:ffffffff8c207d28 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff8c2bc9c0 RSI: ffffffff89f469ab RDI: 0000000000000000 RBP: ffff888145cc0064 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888145cc0000 R14: ffff888145cc0064 R15: ffff888145ebe804 acpi_idle_enter+0x368/0x510 drivers/acpi/processor_idle.c:709 cpuidle_enter_state+0x1af/0xd40 drivers/cpuidle/cpuidle.c:239 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:356 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x3f7/0x590 kernel/sched/idle.c:303 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:400 rest_init+0x16d/0x270 init/main.c:729 arch_call_rest_init+0x13/0x1c init/main.c:890 start_kernel+0x477/0x498 init/main.c:1145 secondary_startup_64_no_verify+0xce/0xdb ---------------- Code disassembly (best guess): 0: 89 de mov %ebx,%esi 2: e8 66 ac 8b f7 callq 0xf78bac6d 7: 84 db test %bl,%bl 9: 75 ac jne 0xffffffb7 b: e8 ed af 8b f7 callq 0xf78baffd 10: e8 78 30 92 f7 callq 0xf792308d 15: eb 0c jmp 0x23 17: e8 e1 af 8b f7 callq 0xf78baffd 1c: 0f 00 2d 7a 63 be 00 verw 0xbe637a(%rip) # 0xbe639d 23: e8 d5 af 8b f7 callq 0xf78baffd 28: fb sti 29: f4 hlt * 2a: 9c pushfq <-- trapping instruction 2b: 5b pop %rbx 2c: 81 e3 00 02 00 00 and $0x200,%ebx 32: fa cli 33: 31 ff xor %edi,%edi 35: 48 89 de mov %rbx,%rsi 38: e8 90 ac 8b f7 callq 0xf78baccd 3d: 48 85 db test %rbx,%rbx