================================ WARNING: inconsistent lock state 5.5.0-next-20200207-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/10316 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880979f81c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffff8880979f81c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] ffff8880979f81c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:304 [inline] rxrpc_connect_call+0x358/0x4e30 net/rxrpc/conn_client.c:701 rxrpc_new_client_call+0x9c0/0x1ad0 net/rxrpc/call_object.c:290 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:595 [inline] rxrpc_do_sendmsg+0xffa/0x1d5f net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:586 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x358/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2487 __do_sys_sendmmsg net/socket.c:2516 [inline] __se_sys_sendmmsg net/socket.c:2513 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2513 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 7474 hardirqs last enabled at (7474): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (7474): [] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (7473): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (7473): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (7436): [] lock_sock_nested+0x9a/0x120 net/core/sock.c:2939 softirqs last disabled at (7439): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (7439): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&local->client_conns_lock)->rlock); lock(&(&local->client_conns_lock)->rlock); *** DEADLOCK *** 2 locks held by syz-executor.0/10316: #0: ffff8880600bd4d0 (sk_lock-AF_RXRPC){+.+.}, at: lock_sock include/net/sock.h:1516 [inline] #0: ffff8880600bd4d0 (sk_lock-AF_RXRPC){+.+.}, at: rxrpc_recvmsg+0x239/0x3252 net/rxrpc/recvmsg.c:460 #1: ffffffff89bac640 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #1: ffffffff89bac640 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 1 PID: 10316 Comm: syz-executor.0 Not tainted 5.5.0-next-20200207-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_usage_bug.cold+0x327/0x378 kernel/locking/lockdep.c:3100 valid_state kernel/locking/lockdep.c:3111 [inline] mark_lock_irq kernel/locking/lockdep.c:3308 [inline] mark_lock+0xbb4/0x1220 kernel/locking/lockdep.c:3665 mark_usage kernel/locking/lockdep.c:3565 [inline] __lock_acquire+0x1e8e/0x4a00 kernel/locking/lockdep.c:3908 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 rxrpc_put_connection net/rxrpc/ar-internal.h:965 [inline] rxrpc_rcu_destroy_call+0xbd/0x200 net/rxrpc/call_object.c:572 rcu_do_batch kernel/rcu/tree.c:2186 [inline] rcu_core+0x5e1/0x1390 kernel/rcu/tree.c:2410 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2419 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline] RIP: 0010:__local_bh_enable_ip+0x18e/0x270 kernel/softirq.c:196 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 df 00 00 00 48 83 3d 77 2b 6c 08 00 0f 84 8f 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 63 94 ba 7e 85 c0 74 7f 5b 41 5c 41 5d 5d c3 80 3d b1 a3 RSP: 0018:ffffc900067ef7e0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13676b1 RBX: 0000000000000200 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88806022aa9c RBP: ffffc900067ef7f8 R08: 1ffffffff16a398f R09: fffffbfff16a3990 R10: fffffbfff16a398f R11: ffffffff8b51cc7f R12: ffffffff8631574a R13: ffff88806022a200 R14: ffff8880600bd448 R15: 0000000000000000 local_bh_enable include/linux/bottom_half.h:32 [inline] lock_sock_nested+0xe2/0x120 net/core/sock.c:2945 lock_sock include/net/sock.h:1516 [inline] rxrpc_recvmsg+0x239/0x3252 net/rxrpc/recvmsg.c:460 sock_recvmsg_nosec net/socket.c:886 [inline] ____sys_recvmsg+0x50d/0x5f0 net/socket.c:2564 ___sys_recvmsg+0xe4/0x150 net/socket.c:2608 do_recvmmsg+0x27e/0x7a0 net/socket.c:2706 __sys_recvmmsg+0x259/0x270 net/socket.c:2785 __do_sys_recvmmsg net/socket.c:2808 [inline] __se_sys_recvmmsg net/socket.c:2801 [inline] __x64_sys_recvmmsg+0xe6/0x140 net/socket.c:2801 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b399 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fafb8d8bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fafb8d8c6d4 RCX: 000000000045b399 RDX: 04000000000005cd RSI: 0000000020000800 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000042 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000891 R14: 00000000004c9f8b R15: 000000000075bfd4