================================ WARNING: inconsistent lock state 5.5.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u4:8/668 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880a03071c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffff8880a03071c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] ffff8880a03071c8 (&(&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: 7312364 hardirqs last enabled at (7312364): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (7312364): [] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (7312363): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (7312363): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (7312332): [] spin_unlock_bh include/linux/spinlock.h:383 [inline] softirqs last enabled at (7312332): [] batadv_nc_purge_paths+0x265/0x370 net/batman-adv/network-coding.c:470 softirqs last disabled at (7312343): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (7312343): [] 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 *** 4 locks held by kworker/u4:8/668: #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8882157c0d28 ((wq_completion)bat_events){+.+.}, at: process_one_work+0x8dd/0x17a0 kernel/workqueue.c:2235 #1: ffffc90002bd7dc0 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x917/0x17a0 kernel/workqueue.c:2239 #2: ffffffff89babb80 (rcu_read_lock){....}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:405 [inline] #2: ffffffff89babb80 (rcu_read_lock){....}, at: batadv_nc_worker+0xe3/0x760 net/batman-adv/network-coding.c:718 #3: ffffffff89babac0 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #3: ffffffff89babac0 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 0 PID: 668 Comm: kworker/u4:8 Not tainted 5.5.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:199 Code: c0 08 aa b3 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 12 85 c7 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 87 7f 64 f9 65 8b 05 78 f9 15 78 85 c0 74 06 41 RSP: 0018:ffffc90002bd7a50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1367541 RBX: ffff8880a7b8a600 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffff8880a7b8aee8 RDI: ffff8880a7b8ae94 RBP: ffffc90002bd7a58 R08: 1ffffffff16a1d83 R09: fffffbfff16a1d84 R10: fffffbfff16a1d83 R11: ffffffff8b50ec1f R12: ffff8880ae837540 R13: ffff88806a788600 R14: 0000000000000000 R15: 0000000000000001 finish_lock_switch kernel/sched/core.c:3125 [inline] finish_task_switch+0x147/0x750 kernel/sched/core.c:3225 context_switch kernel/sched/core.c:3389 [inline] __schedule+0x93c/0x1f90 kernel/sched/core.c:4082 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4339 retint_kernel+0x1b/0x2b RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4487 Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d 19 ad 58 08 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b RSP: 0018:ffffc90002bd7c70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff136753f RBX: ffff8880a7b8a600 RCX: ffffffff815aa1f0 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc90002bd7cb8 R08: 1ffffffff16a1d6c R09: fffffbfff16a1d6d R10: ffff8880a7b8aee8 R11: ffff8880a7b8a600 R12: ffffffff89babb80 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:601 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0x117/0x760 net/batman-adv/network-coding.c:718 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352