rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (6271 ticks this GP) idle=bd6/1/0x4000000000000000 softirq=25846/25847 fqs=5145 
	(t=10500 jiffies g=37809 q=776)
NMI backtrace for cpu 0
CPU: 0 PID: 15549 Comm: syz-executor.5 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:ipv4_dst_check+0x2/0x190 net/ipv4/route.c:1191
Code: e4 28 67 fc e9 2c ff ff ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e9 6b 75 08 fa 90 66 2e 0f 1f 84 00 00 00 00 00 41 55 <41> 54 55 53 48 89 fb e8 52 75 08 fa 48 8d 7b 3a 48 b8 00 00 00 00
RSP: 0018:ffffc900000076e0 EFLAGS: 00000246
RAX: ffffffff8ca31080 RBX: ffff88802fa7bab0 RCX: ffffffff8820d855
RDX: 1ffffffff1946212 RSI: 0000000000000000 RDI: ffff888014a16c00
RBP: ffff88802fa7b800 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888060790000
R13: 0000000000000001 R14: ffff888061ed3b80 R15: ffff888014a16c00
 dst_check include/net/dst.h:455 [inline]
 sctp_transport_dst_check include/net/sctp/sctp.h:565 [inline]
 sctp_packet_config+0x33e/0xd60 net/sctp/output.c:102
 sctp_outq_select_transport+0x1e4/0x740 net/sctp/outqueue.c:859
 sctp_outq_flush_ctrl.constprop.0+0x291/0xc40 net/sctp/outqueue.c:893
 sctp_outq_flush+0xf3/0x2580 net/sctp/outqueue.c:1186
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1801 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline]
 sctp_do_sm+0x745/0x5120 net/sctp/sm_sideeffect.c:1156
 sctp_generate_heartbeat_event+0x2b5/0x490 net/sctp/sm_sideeffect.c:391
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
 expire_timers kernel/time/timer.c:1455 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:4789
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 82 3a 64 f8 e8 ad a0 8e f8 fb bf 01 00 00 00 <e8> 82 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 f0 22 64
RSP: 0018:ffffc9000b61f698 EFLAGS: 00000206
RAX: 0000000000035de7 RBX: ffff888019a33480 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1003346690 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:___might_sleep+0x20/0x2b0 kernel/sched/core.c:7270
Code: 66 2e 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55 48 89 fd 53 89 d3 e8 5b 4c 9a 07 85 c0 74 0d 80 3d f2 29 8d 0b 00 <0f> 84 c2 01 00 00 e8 45 4c 9a 07 85 c0 74 0d 80 3d db 29 8d 0b 00
RSP: 0018:ffffc9000b61f768 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81a140f3
RDX: 0000000000000000 RSI: 000000000000054f RDI: ffffffff89556720
RBP: ffffffff89556720 R08: 0000000000000000 R09: ffff88804c70bc03
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000054f
R13: 0000000020ffefff R14: dffffc0000000000 R15: 0000000020fff000
 zap_pmd_range mm/memory.c:1359 [inline]
 zap_pud_range mm/memory.c:1386 [inline]
 zap_p4d_range mm/memory.c:1407 [inline]
 unmap_page_range+0x171d/0x2640 mm/memory.c:1428
 unmap_single_vma+0x198/0x300 mm/memory.c:1473
 unmap_vmas+0x168/0x2e0 mm/memory.c:1505
 exit_mmap+0x2b1/0x530 mm/mmap.c:3220
 __mmput+0x122/0x470 kernel/fork.c:1079
 mmput+0x53/0x60 kernel/fork.c:1100
 exit_mm kernel/exit.c:486 [inline]
 do_exit+0xa72/0x29b0 kernel/exit.c:796
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x42a/0x1f10 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e159
Code: Unable to access opcode bytes at RIP 0x45e12f.
RSP: 002b:00007f6035227c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: 0000000000000009 RBX: 0000000000000004 RCX: 000000000045e159
RDX: 0000000000000042 RSI: 0000000020002080 RDI: ffffffffffffff9c
RBP: 000000000119c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc
R13: 00007ffd880839ef R14: 00007f60352289c0 R15: 000000000119c0dc