================================ WARNING: inconsistent lock state 6.1.0-rc5-syzkaller-01350-ga66d79ee0bd5 #0 Not tainted -------------------------------- inconsistent {IN-SOFTIRQ-R} -> {SOFTIRQ-ON-W} usage. syz-executor.1/7679 [HC0[0]:SC0[0]:HE1:SE1] takes: ffff8880458e4bb8 (clock-AF_INET6){+++-}-{2:2}, at: l2tp_tunnel_register+0x126/0x1210 net/l2tp/l2tp_core.c:1477 {IN-SOFTIRQ-R} state was registered at: lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline] _raw_read_lock_bh+0x3f/0x70 kernel/locking/spinlock.c:252 rds_tcp_write_space+0x29/0x690 net/rds/tcp_send.c:184 tcp_new_space net/ipv4/tcp_input.c:5482 [inline] tcp_check_space+0x11b/0x810 net/ipv4/tcp_input.c:5501 tcp_data_snd_check net/ipv4/tcp_input.c:5510 [inline] tcp_rcv_established+0x93e/0x2230 net/ipv4/tcp_input.c:6018 tcp_v6_do_rcv+0x814/0x13c0 net/ipv6/tcp_ipv6.c:1502 tcp_v6_rcv+0x2e9e/0x3840 net/ipv6/tcp_ipv6.c:1761 ip6_protocol_deliver_rcu+0x2df/0x1950 net/ipv6/ip6_input.c:439 ip6_input_finish+0x150/0x2c0 net/ipv6/ip6_input.c:484 NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:493 dst_input include/net/dst.h:454 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5482 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5596 process_backlog+0x3e4/0x810 net/core/dev.c:5924 __napi_poll+0xb8/0x770 net/core/dev.c:6485 napi_poll net/core/dev.c:6552 [inline] net_rx_action+0xa00/0xde0 net/core/dev.c:6663 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472 do_softirq kernel/softirq.c:464 [inline] __local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:820 [inline] ip6_finish_output2+0x5be/0x1530 net/ipv6/ip6_output.c:135 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip6_xmit+0x11f7/0x1c60 net/ipv6/ip6_output.c:343 inet6_csk_xmit+0x3b5/0x6d0 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x1967/0x3800 net/ipv4/tcp_output.c:1399 __tcp_send_ack.part.0+0x3a7/0x760 net/ipv4/tcp_output.c:3983 __tcp_send_ack net/ipv4/tcp_output.c:3989 [inline] tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5535 tcp_ack_snd_check net/ipv4/tcp_input.c:5581 [inline] tcp_rcv_established+0x992/0x2230 net/ipv4/tcp_input.c:6019 tcp_v6_do_rcv+0x814/0x13c0 net/ipv6/tcp_ipv6.c:1502 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2920 release_sock+0x58/0x1b0 net/core/sock.c:3476 inet_wait_for_connect net/ipv4/af_inet.c:598 [inline] __inet_stream_connect+0x757/0xed0 net/ipv4/af_inet.c:690 inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:729 mptcp_connect+0x4b2/0x8c0 net/mptcp/protocol.c:3567 __inet_stream_connect+0x69e/0xed0 net/ipv4/af_inet.c:665 mptcp_stream_connect+0xb0/0x110 net/mptcp/protocol.c:3651 __sys_connect_file+0x153/0x1a0 net/socket.c:1976 __sys_connect+0x165/0x1a0 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2000 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: 143 hardirqs last enabled at (143): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (143): [] _raw_spin_unlock_irqrestore+0x54/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (142): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (142): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (138): [] rcu_read_unlock_bh include/linux/rcupdate.h:816 [inline] softirqs last enabled at (138): [] l2tp_tunnel_get+0x3fb/0x750 net/l2tp/l2tp_core.c:219 softirqs last disabled at (136): [] rcu_read_unlock include/linux/rcupdate.h:779 [inline] softirqs last disabled at (136): [] net_generic include/net/netns/generic.h:48 [inline] softirqs last disabled at (136): [] l2tp_pernet net/l2tp/l2tp_core.c:125 [inline] softirqs last disabled at (136): [] l2tp_tunnel_get+0x14d/0x750 net/l2tp/l2tp_core.c:207 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(clock-AF_INET6); lock(clock-AF_INET6); *** DEADLOCK *** 1 lock held by syz-executor.1/7679: #0: ffff88804cf8e130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1721 [inline] #0: ffff88804cf8e130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: pppol2tp_connect+0xadc/0x1a10 net/l2tp/l2tp_ppp.c:675 stack backtrace: CPU: 1 PID: 7679 Comm: syz-executor.1 Not tainted 6.1.0-rc5-syzkaller-01350-ga66d79ee0bd5 #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:222 [inline] valid_state kernel/locking/lockdep.c:3975 [inline] mark_lock_irq kernel/locking/lockdep.c:4184 [inline] mark_lock.part.0.cold+0x3a/0xd8 kernel/locking/lockdep.c:4634 mark_lock kernel/locking/lockdep.c:4598 [inline] mark_usage kernel/locking/lockdep.c:4547 [inline] __lock_acquire+0x893/0x56d0 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 include/linux/rwlock_api_smp.h:209 [inline] _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300 l2tp_tunnel_register+0x126/0x1210 net/l2tp/l2tp_core.c:1477 pppol2tp_connect+0xcdc/0x1a10 net/l2tp/l2tp_ppp.c:723 __sys_connect_file+0x153/0x1a0 net/socket.c:1976 __sys_connect+0x165/0x1a0 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2000 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 RIP: 0033:0x7f465648c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f46571c0168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f46565abf80 RCX: 00007f465648c0d9 RDX: 000000000000002e RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f46564e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf5bb450f R14: 00007f46571c0300 R15: 0000000000022000 BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 7679, name: syz-executor.1 preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 1 PID: 7679 Comm: syz-executor.1 Not tainted 6.1.0-rc5-syzkaller-01350-ga66d79ee0bd5 #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 __might_resched.cold+0x222/0x26b kernel/sched/core.c:9890 percpu_down_read include/linux/percpu-rwsem.h:49 [inline] cpus_read_lock+0x1b/0x140 kernel/cpu.c:310 static_key_slow_inc+0x12/0x20 kernel/jump_label.c:158 udp_tunnel_encap_enable include/net/udp_tunnel.h:187 [inline] setup_udp_tunnel_sock+0x43d/0x550 net/ipv4/udp_tunnel_core.c:81 l2tp_tunnel_register+0xc51/0x1210 net/l2tp/l2tp_core.c:1509 pppol2tp_connect+0xcdc/0x1a10 net/l2tp/l2tp_ppp.c:723 __sys_connect_file+0x153/0x1a0 net/socket.c:1976 __sys_connect+0x165/0x1a0 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2000 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 RIP: 0033:0x7f465648c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f46571c0168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f46565abf80 RCX: 00007f465648c0d9 RDX: 000000000000002e RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f46564e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf5bb450f R14: 00007f46571c0300 R15: 0000000000022000