rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P17970/3:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=59873, q=2276 ncpus=2)
task:syz.0.3288      state:R  running task     stack:25440 pid:17970 tgid:17968 ppid:15622  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5260 [inline]
 __schedule+0x14ea/0x5050 kernel/sched/core.c:6867
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7194
 irqentry_exit+0x597/0x620 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:235
Code: 48 16 00 00 83 fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 48 8d 7e 01 8b 89 4c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> cc cc cc cc cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90003f3ea70 EFLAGS: 00000246
RAX: ffffffff8a427e9a RBX: ffff888031391000 RCX: 0000000000080000
RDX: ffffc9001c5a5000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffffc90003f3eda0 R09: ffffc90003f3edb0
R10: ffffc90003f3ec00 R11: fffff520007e7d82 R12: 0000000000000003
R13: ffff888054be74c8 R14: dffffc0000000000 R15: 0000000000000001
 __in6_dev_get include/net/addrconf.h:347 [inline]
 ip6_ignore_linkdown+0x7a/0x140 include/net/addrconf.h:448
 find_match+0x9c/0xb40 net/ipv6/route.c:780
 __find_rr_leaf+0x248/0x760 net/ipv6/route.c:868
 find_rr_leaf net/ipv6/route.c:889 [inline]
 rt6_select net/ipv6/route.c:933 [inline]
 fib6_table_lookup+0x3b4/0xa80 net/ipv6/route.c:2244
 ip6_pol_route+0x228/0x13d0 net/ipv6/route.c:2280
 pol_lookup_func include/net/ip6_fib.h:617 [inline]
 fib6_rule_lookup+0x36b/0x730 net/ipv6/fib6_rules.c:125
 ip6_route_output_flags_noref net/ipv6/route.c:2695 [inline]
 ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2707
 ip6_dst_lookup_tail+0x2ae/0x15a0 net/ipv6/ip6_output.c:1169
 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1272
 sctp_v6_get_dst+0xf34/0x1ce0 net/sctp/ipv6.c:385
 sctp_transport_route+0x118/0x2f0 net/sctp/transport.c:448
 sctp_packet_config+0x46c/0xe30 net/sctp/output.c:103
 sctp_packet_singleton+0x16f/0x340 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
 sctp_outq_flush+0x50d/0x31b0 net/sctp/outqueue.c:1212
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline]
 sctp_do_sm+0x54c7/0x5cf0 net/sctp/sm_sideeffect.c:1175
 sctp_primitive_ASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73
 __sctp_connect+0x911/0xdc0 net/sctp/socket.c:1235
 sctp_getsockopt_connectx3+0x227/0x360 net/sctp/socket.c:1422
 sctp_getsockopt+0x984/0xb90 net/sctp/socket.c:8174
 do_sock_getsockopt+0x2d3/0x3f0 net/socket.c:2383
 __sys_getsockopt net/socket.c:2412 [inline]
 __do_sys_getsockopt net/socket.c:2419 [inline]
 __se_sys_getsockopt net/socket.c:2416 [inline]
 __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2416
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b9679bf79
RSP: 002b:00007f5b949f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f5b96a15fa0 RCX: 00007f5b9679bf79
RDX: 000000000000006f RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00007f5b968327e0 R08: 0000200000002100 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5b96a16038 R14: 00007f5b96a15fa0 R15: 00007ffd184d6208
 </TASK>