================================ WARNING: inconsistent lock state 5.5.0-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.2/13728 [HC0[0]:SC1[1]:HE1:SE0] takes: ffffffff8a8c8538 (rxrpc_conn_id_lock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffffffff8a8c8538 (rxrpc_conn_id_lock){+.?.}, at: rxrpc_put_client_connection_id net/rxrpc/conn_client.c:138 [inline] ffffffff8a8c8538 (rxrpc_conn_id_lock){+.?.}, at: rxrpc_put_client_connection_id+0x73/0xe0 net/rxrpc/conn_client.c:135 {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_connection_id net/rxrpc/conn_client.c:109 [inline] rxrpc_alloc_client_connection net/rxrpc/conn_client.c:193 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:340 [inline] rxrpc_connect_call+0x954/0x4e30 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: 12846 hardirqs last enabled at (12846): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (12846): [] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (12845): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (12845): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (12806): [] raw_unhash_sk+0x20a/0x2b0 net/ipv4/raw.c:116 softirqs last disabled at (12815): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (12815): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(rxrpc_conn_id_lock); lock(rxrpc_conn_id_lock); *** DEADLOCK *** 3 locks held by syz-executor.2/13728: #0: ffffffff8a739708 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x27b/0x5a0 net/core/net_namespace.c:464 #1: ffffffff89babb80 (rcu_read_lock){....}, at: mem_cgroup_sk_alloc+0x87/0x210 mm/memcontrol.c:6707 #2: ffffffff89babac0 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #2: ffffffff89babac0 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 0 PID: 13728 Comm: syz-executor.2 Not tainted 5.5.0-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_client_connection_id net/rxrpc/conn_client.c:138 [inline] rxrpc_put_client_connection_id+0x73/0xe0 net/rxrpc/conn_client.c:135 rxrpc_put_one_client_conn net/rxrpc/conn_client.c:955 [inline] rxrpc_put_client_conn+0x243/0xc90 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:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:180 Code: ff cc cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1e 02 00 48 8b 80 98 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 34 c7 8c 7e 81 e2 RSP: 0018:ffffc900059c7900 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff83a3c1aa RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffffc900059c7918 R08: ffff888059758040 R09: ffff8880597588d0 R10: fffffbfff154a148 R11: ffffffff8aa50a47 R12: 0000000000000000 R13: ffff88805ed42bd8 R14: 0000000000000000 R15: ffff88805ed42888 rcu_dynticks_curr_cpu_in_eqs+0x17/0xb0 kernel/rcu/tree.c:299 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:919 rcu_read_unlock+0x35/0x60 include/linux/rcupdate.h:651 mem_cgroup_sk_alloc+0x149/0x210 mm/memcontrol.c:6706 sk_alloc+0x477/0xfd0 net/core/sock.c:1676 inet6_create net/ipv6/af_inet6.c:180 [inline] inet6_create+0x35b/0xf80 net/ipv6/af_inet6.c:107 __sock_create+0x3ce/0x730 net/socket.c:1433 sock_create_kern+0x3b/0x50 net/socket.c:1502 inet_ctl_sock_create+0x9d/0x1f0 net/ipv4/af_inet.c:1629 ndisc_net_init+0x84/0x200 net/ipv6/ndisc.c:1881 ops_init+0xb3/0x420 net/core/net_namespace.c:137 setup_net+0x2d5/0x8b0 net/core/net_namespace.c:327 copy_net_ns+0x29e/0x5a0 net/core/net_namespace.c:468 create_new_namespaces+0x403/0xb50 kernel/nsproxy.c:108 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:229 ksys_unshare+0x444/0x980 kernel/fork.c:2955 __do_sys_unshare kernel/fork.c:3023 [inline] __se_sys_unshare kernel/fork.c:3021 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3021 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:00007f4d0ddb3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f4d0ddb46d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c0b R14: 00000000004cce9d R15: 000000000075bf2c