================================
WARNING: inconsistent lock state
5.5.0-next-20200207-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
syz-executor.2/12713 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffff88809bfae1c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline]
ffff88809bfae1c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline]
ffff88809bfae1c8 (&(&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: 19884
hardirqs last  enabled at (19884): [<ffffffff87f01836>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (19884): [<ffffffff87f01836>] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191
hardirqs last disabled at (19883): [<ffffffff87f01baf>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (19883): [<ffffffff87f01baf>] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159
softirqs last  enabled at (18614): [<ffffffff87438c6d>] spin_unlock_bh include/linux/spinlock.h:383 [inline]
softirqs last  enabled at (18614): [<ffffffff87438c6d>] rxrpc_disconnect_call+0x20d/0x3a0 net/rxrpc/conn_object.c:219
softirqs last disabled at (19847): [<ffffffff8147a12b>] invoke_softirq kernel/softirq.c:373 [inline]
softirqs last disabled at (19847): [<ffffffff8147a12b>] 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);
  <Interrupt>
    lock(&(&local->client_conns_lock)->rlock);

 *** DEADLOCK ***

2 locks held by syz-executor.2/12713:
 #0: ffff88809a485f38 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline]
 #0: ffff88809a485f38 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_pte_range mm/memory.c:1038 [inline]
 #0: ffff88809a485f38 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_pmd_range mm/memory.c:1184 [inline]
 #0: ffff88809a485f38 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_pud_range mm/memory.c:1213 [inline]
 #0: ffff88809a485f38 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: zap_p4d_range mm/memory.c:1234 [inline]
 #0: ffff88809a485f38 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: unmap_page_range+0x87a/0x2820 mm/memory.c:1255
 #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: 0 PID: 12713 Comm: syz-executor.2 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:
 <IRQ>
 __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
 </IRQ>
RIP: 0010:lock_release+0x4d9/0x960 kernel/locking/lockdep.c:4492
Code: 08 00 0f 84 7f 01 00 00 48 8b bd 48 ff ff ff 57 9d 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 <c7> 43 08 00 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85
RSP: 0018:ffffc900054ff5d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: fffff52000a9febf RCX: 1ffff11012db2972
RDX: dffffc0000000000 RSI: 1ffff11012db2979 RDI: 0000000000000286
RBP: ffffc900054ff6a0 R08: 0000000000000002 R09: ffff888096d94b98
R10: fffffbfff154baa0 R11: ffffffff8aa5d507 R12: ffff888096d94300
R13: ffffffff81bb3673 R14: ffffc900054ff678 R15: ffff888096d94300
 rcu_lock_release include/linux/rcupdate.h:213 [inline]
 rcu_read_unlock include/linux/rcupdate.h:655 [inline]
 __unlock_page_memcg+0x6b/0x100 mm/memcontrol.c:2019
 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:2028
 page_remove_file_rmap mm/rmap.c:1273 [inline]
 page_remove_rmap+0x60c/0x11d0 mm/rmap.c:1330
 zap_pte_range mm/memory.c:1080 [inline]
 zap_pmd_range mm/memory.c:1184 [inline]
 zap_pud_range mm/memory.c:1213 [inline]
 zap_p4d_range mm/memory.c:1234 [inline]
 unmap_page_range+0xdd5/0x2820 mm/memory.c:1255
 unmap_single_vma+0x19d/0x300 mm/memory.c:1300
 unmap_vmas+0x184/0x2f0 mm/memory.c:1332
 exit_mmap+0x2ba/0x530 mm/mmap.c:3145
 __mmput kernel/fork.c:1082 [inline]
 mmput+0x179/0x4d0 kernel/fork.c:1103
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0xae4/0x3030 kernel/exit.c:788
 do_group_exit+0x135/0x360 kernel/exit.c:899
 get_signal+0x47c/0x24f0 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:813
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 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:00007fc1c2d77c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 00000000000005cd RBX: 00007fc1c2d786d4 RCX: 000000000045b399
RDX: 04000000000005cd RSI: 0000000020000800 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000042 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000891 R14: 00000000004c9f8b R15: 000000000075bf2c
TCP: request_sock_TCP: Possible SYN flooding on port 2. Sending cookies.  Check SNMP counters.