rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4463/1:b..l
	(detected by 1, t=10502 jiffies, g=8301, q=100)
task:syz.0.54        state:R  running task     stack:25664 pid: 4463 ppid:  4181 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__sanitizer_cov_trace_pc+0x3e/0x60 kernel/kcov.c:211
Code: e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00 00 74 2c 8b 91 10 16 00 00 83 fa 02 75 21 48 8b 91 18 16 00 00 <48> 8b 32 48 8d 7e 01 8b 89 14 16 00 00 48 39 cf 73 08 48 89 44 f2
RSP: 0018:ffffc9000421f428 EFLAGS: 00000246
RAX: ffffffff87d9e312 RBX: ffffffff8d2ebef8 RCX: ffff8880251a0000
RDX: ffffc90005819000 RSI: ffffffff8d2ebe80 RDI: ffff88807a49d800
RBP: 0000000000000006 R08: 00000000ffffffff R09: 0000000000000006
R10: 000000000217693e R11: 0000000039e30332 R12: dffffc0000000000
R13: ffffffff8d2ebe80 R14: ffff88807a49d800 R15: ffff888079132000
 dst_init+0x32/0x3f0 net/core/dst.c:50
 dst_alloc+0x12a/0x160 net/core/dst.c:92
 rt_dst_alloc net/ipv4/route.c:1653 [inline]
 __mkroute_output net/ipv4/route.c:2626 [inline]
 ip_route_output_key_hash_rcu+0x15ee/0x24d0 net/ipv4/route.c:2849
 ip_route_output_key_hash+0x1b1/0x2e0 net/ipv4/route.c:2678
 __ip_route_output_key include/net/route.h:126 [inline]
 ip_route_output_flow+0x26/0x150 net/ipv4/route.c:2908
 raw_sendmsg+0xf7e/0x1890 net/ipv4/raw.c:647
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2500
 __sys_sendmmsg+0x27c/0x4a0 net/socket.c:2586
 __do_sys_sendmmsg net/socket.c:2615 [inline]
 __se_sys_sendmmsg net/socket.c:2612 [inline]
 __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2612
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5dc85836c9
RSP: 002b:00007f5dc67ea038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f5dc87d9fa0 RCX: 00007f5dc85836c9
RDX: 0000000004000095 RSI: 0000200000005240 RDI: 0000000000000006
RBP: 00007f5dc8605f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5dc87da038 R14: 00007f5dc87d9fa0 R15: 00007ffe16ccbde8
 </TASK>
rcu: rcu_preempt kthread starved for 10538 jiffies! g8301 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27584 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:729