rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=4c24/1/0x4000000000000000 softirq=51318/51318 fqs=0
rcu: 	(t=10500 jiffies g=38021 q=15 ncpus=1)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g38021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=19075
rcu: rcu_preempt kthread starved for 10500 jiffies! g38021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27752 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
CPU: 0 UID: 0 PID: 9509 Comm: syz.0.1512 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 db 3e ad 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000fcbe380 EFLAGS: 00000206
RAX: 7a106aa630100900 RBX: 0000000000000000 RCX: 7a106aa630100900
RDX: 0000000000000000 RSI: ffffffff8d6f2b50 RDI: ffffffff8b9ed4e0
RBP: ffffffff8ade4d28 R08: 0000000000000000 R09: ffffffff8ade4d28
R10: dffffc0000000000 R11: fffffbfff1eb7627 R12: 0000000000000002
R13: ffffffff8dd3b160 R14: 0000000000000000 R15: 0000000000000246
FS:  00007f5c7aee86c0(0000) GS:ffff88808d98a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffacb17800 CR3: 0000000059fab000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 tipc_sk_lookup+0xd9/0x920 net/tipc/socket.c:2997
 tipc_sk_rcv+0x3f9/0x2c30 net/tipc/socket.c:2490
 tipc_node_xmit+0x1c9/0xe90 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x2a0/0x3b0 net/tipc/node.c:1781
 tipc_sk_rcv+0x2633/0x2c30 net/tipc/socket.c:2499
 tipc_node_xmit+0x1c9/0xe90 net/tipc/node.c:1701
 tipc_sk_push_backlog net/tipc/socket.c:1312 [inline]
 tipc_sk_filter_connect net/tipc/socket.c:2253 [inline]
 tipc_sk_filter_rcv+0x1cc6/0x31f0 net/tipc/socket.c:2362
 tipc_sk_enqueue net/tipc/socket.c:2443 [inline]
 tipc_sk_rcv+0x8a2/0x2c30 net/tipc/socket.c:2495
 tipc_node_xmit+0x1c9/0xe90 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x2a0/0x3b0 net/tipc/node.c:1781
 tipc_sk_backlog_rcv+0x1a1/0x230 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1158 [inline]
 __release_sock+0x294/0x3a0 net/core/sock.c:3180
 release_sock+0x5f/0x1f0 net/core/sock.c:3735
 sockopt_release_sock net/core/sock.c:1155 [inline]
 sk_setsockopt+0x2076/0x2dc0 net/core/sock.c:1668
 do_sock_setsockopt+0x201/0x3e0 net/socket.c:2356
 __sys_setsockopt net/socket.c:2385 [inline]
 __do_sys_setsockopt net/socket.c:2391 [inline]
 __se_sys_setsockopt net/socket.c:2388 [inline]
 __x64_sys_setsockopt+0x18b/0x220 net/socket.c:2388
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c79f8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5c7aee8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f5c7a1e6090 RCX: 00007f5c79f8eec9
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f5c7a011f91 R08: 0000000000000004 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5c7a1e6128 R14: 00007f5c7a1e6090 R15: 00007ffca3265798
 </TASK>