rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9617/2:b.el
rcu: 	(detected by 0, t=10502 jiffies, g=33677, q=5987 ncpus=2)
task:syz.5.769       state:R  running task     stack:24528 pid:9617  tgid:9613  ppid:7643   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:ipt_do_table+0x15cb/0x1860 net/ipv4/netfilter/ip_tables.c:362
Code: 08 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 a0 01 00 00 0f 85 87 02 00 00 44 89 f8 48 8d 65 d8 5b 41 5c 41 5d 41 5e <41> 5f 5d e9 68 fe 9f 01 e8 78 41 4f f7 4c 8b 74 24 30 e9 44 ff ff
RSP: 0018:ffffc900105f6e08 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000002 RCX: ffffffff817b378a
RDX: ffff88802ff7da00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900105f6e10 R08: ffffffff8a50424a R09: 1ffffffff2854929
R10: dffffc0000000000 R11: fffffbfff285492a R12: ffff888062233000
R13: 1ffff11004fc21a7 R14: ffffc900105f6f40 R15: 0000000000000001
 ipt_mangle_out net/ipv4/netfilter/iptable_mangle.c:53 [inline]
 iptable_mangle_hook+0x154/0x4b0 net/ipv4/netfilter/iptable_mangle.c:79
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:626
 nf_hook+0x2c4/0x450 include/linux/netfilter.h:269
 __ip_local_out+0x3d9/0x4e0 net/ipv4/ip_output.c:119
 ip_local_out net/ipv4/ip_output.c:128 [inline]
 __ip_queue_xmit+0x12a0/0x1ef0 net/ipv4/ip_output.c:536
 sctp_packet_transmit+0x26d8/0x2cc0 net/sctp/output.c:653
 sctp_packet_singleton+0x22c/0x320 net/sctp/outqueue.c:783
 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
 sctp_outq_flush+0x6d5/0x3e20 net/sctp/outqueue.c:1212
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x59cc/0x60c0 net/sctp/sm_sideeffect.c:1169
 sctp_primitive_ASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0xfa5/0x1800 net/sctp/socket.c:1841
 sctp_sendmsg+0x1bc3/0x3520 net/sctp/socket.c:2031
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:726
 __sys_sendto+0x363/0x4c0 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75cbb85d29
RSP: 002b:00007f75cca1e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f75cbd76080 RCX: 00007f75cbb85d29
RDX: 0000000000000001 RSI: 0000000020000300 RDI: 0000000000000005
RBP: 00007f75cbc01b08 R08: 0000000020000040 R09: 0000000000000010
R10: 0000000000003000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f75cbd76080 R15: 00007ffe9c46ef08
 </TASK>