rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=271c/1/0x4000000000000000 softirq=44636/44636 fqs=5191
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1367563          0            0
rcu: 	cputime:    30870      21628           68   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=40309 q=3028 ncpus=2)
CPU: 0 UID: 0 PID: 12144 Comm: syz.6.1761 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:fib_table_lookup+0x11d/0x16e0
Code: 31 ff 89 c6 e8 d4 0a 9b f7 85 db 0f 84 48 0d 00 00 e8 87 06 9b f7 4d 85 e4 0f 84 2a 03 00 00 41 0f cf 48 8b 44 24 28 65 ff 00 <48> c7 44 24 40 00 00 00 00 44 89 7c 24 0c 4c 89 e0 48 c1 e8 03 0f
RSP: 0018:ffffc90000007190 EFLAGS: 00000206
RAX: 0000607d567d2560 RBX: 0000000000000001 RCX: ffff8881138dba80
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8a0a26e6 R09: ffffffff8e75e5e0
R10: ffffc900000073c0 R11: fffff52000000e7e R12: ffff888108e93020
R13: ffff88810a587b00 R14: ffff88810a587b30 R15: 00000000ac14142a
FS:  00007f02bce556c0(0000) GS:ffff88818de5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000016a080000 CR4: 00000000000006f0
DR0: 00000000000000d4 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 fib_lookup+0x1c5/0x440
 ip_route_output_key_hash_rcu+0x32e/0x25d0
 ip_route_output_key_hash+0x18d/0x2a0
 ip_route_output_flow+0x2a/0x150
 sctp_v4_get_dst+0xc1e/0x12b0
 sctp_transport_route+0x118/0x2f0
 sctp_packet_config+0x46c/0xe30
 sctp_outq_select_transport+0x462/0x570
 sctp_outq_flush+0x31c/0x31b0
 sctp_do_sm+0x54c7/0x5cf0
 sctp_generate_heartbeat_event+0x2f8/0x450
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x20b/0x2e0
Code: e9 30 ff ff ff e8 45 45 0d 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 c1 d2 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d fe 7a 73
RSP: 0018:ffffc900099cfcd8 EFLAGS: 00000286
RAX: 85ba2e264ef17a00 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8e169d5a RDI: ffffffff8c27ca00
RBP: 0000000000000000 R08: ffffffff824b9d6a R09: ffffffff8e75e5e0
R10: dffffc0000000000 R11: ffffed102e6dd701 R12: 0000000000000002
R13: ffffffff8e75e5e0 R14: 0000000000000000 R15: 0000000000000000
 __fget_files+0x47/0x420
 fdget+0x16b/0x1e0
 __x64_sys_sendmsg+0x116/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02bbf9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f02bce55028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f02bc216090 RCX: 00007f02bbf9c799
RDX: 0000000020000801 RSI: 0000200000000740 RDI: 0000000000000006
RBP: 00007f02bc032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f02bc216128 R14: 00007f02bc216090 R15: 00007ffc6cf8c9d8
 </TASK>
sched: DL replenish lagged too much
