================================ WARNING: inconsistent lock state 4.14.171-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. ksoftirqd/1/17 [HC0[0]:SC1[1]:HE1:SE0] takes: (&(&local->client_conns_lock)->rlock){+.?.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (&(&local->client_conns_lock)->rlock){+.?.}, at: [] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:905 [inline] (&(&local->client_conns_lock)->rlock){+.?.}, at: [] rxrpc_put_client_conn+0x538/0xaa0 net/rxrpc/conn_client.c:957 {SOFTIRQ-ON-W} state was registered at: mark_irqflags kernel/locking/lockdep.c:3086 [inline] __lock_acquire+0xc33/0x4620 kernel/locking/lockdep.c:3444 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:306 [inline] rxrpc_connect_call+0x2f5/0x41a0 net/rxrpc/conn_client.c:692 rxrpc_new_client_call+0x8f7/0x1420 net/rxrpc/call_object.c:276 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:525 [inline] rxrpc_do_sendmsg+0x92a/0x1109 net/rxrpc/sendmsg.c:577 rxrpc_sendmsg+0x4d1/0x610 net/rxrpc/af_rxrpc.c:543 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 irq event stamp: 2093464 hardirqs last enabled at (2093464): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (2093464): [] _raw_spin_unlock_irqrestore+0x6b/0xe0 kernel/locking/spinlock.c:192 hardirqs last disabled at (2093463): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2093463): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:160 softirqs last enabled at (2093412): [] __do_softirq+0x645/0x9a0 kernel/softirq.c:314 softirqs last disabled at (2093417): [] run_ksoftirqd kernel/softirq.c:670 [inline] softirqs last disabled at (2093417): [] run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662 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 *** 1 lock held by ksoftirqd/1/17: #0: (rcu_callback){....}, at: [] __rcu_reclaim kernel/rcu/rcu.h:185 [inline] #0: (rcu_callback){....}, at: [] rcu_do_batch kernel/rcu/tree.c:2699 [inline] #0: (rcu_callback){....}, at: [] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] #0: (rcu_callback){....}, at: [] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] #0: (rcu_callback){....}, at: [] rcu_process_callbacks+0x893/0x12b0 kernel/rcu/tree.c:2946 stack backtrace: CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_usage_bug.cold+0x330/0x42a kernel/locking/lockdep.c:2585 valid_state kernel/locking/lockdep.c:2598 [inline] mark_lock_irq kernel/locking/lockdep.c:2792 [inline] mark_lock+0xdbd/0x1240 kernel/locking/lockdep.c:3190 mark_irqflags kernel/locking/lockdep.c:3068 [inline] __lock_acquire+0xb57/0x4620 kernel/locking/lockdep.c:3444 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:905 [inline] rxrpc_put_client_conn+0x538/0xaa0 net/rxrpc/conn_client.c:957 rxrpc_put_connection net/rxrpc/ar-internal.h:862 [inline] rxrpc_rcu_destroy_call+0x88/0x190 net/rxrpc/call_object.c:642 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x7b8/0x12b0 kernel/rcu/tree.c:2946 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 run_ksoftirqd kernel/softirq.c:670 [inline] run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662 smpboot_thread_fn+0x5f4/0x960 kernel/smpboot.c:164 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404