------------[ cut here ]------------
WARNING: CPU: 0 PID: 16472 at kernel/rcu/tree_stall.h:894 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:886
Modules linked in:
CPU: 0 PID: 16472 Comm: syz-executor.5 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:894
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 60 15 22 90 e8 ee 1d 5a 00 b8 01 00 00 00 87 05 13 86 c0 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 00 48 98 8b 48 c7 c3 ac 8b 6c 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000007e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000010004d192 RCX: ffffffff81618f42
RDX: fffffbfff20442ac RSI: 0000000000000004 RDI: ffffffff90221560
RBP: ffffffff8b984800 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff20442ac R11: 1ffff1101738a53e R12: 1ffffffff16c1e30
R13: 0000000000000246 R14: ffff8880b9c52912 R15: 0000000000000001
FS:  00007f189290e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2cb25000 CR3: 0000000045331000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:857 [inline]
 rcu_core+0x4df/0x1380 kernel/rcu/tree.c:2780
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6328
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 62 f8 23 f8 e8 bd 3f 50 f8 fb bf 01 00 00 00 <e8> d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 70 e7 23
RSP: 0018:ffffc900016aefb8 EFLAGS: 00000202
RAX: 000000000000329b RBX: ffff88801bac1c40 RCX: 1ffffffff1ad85a1
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1003758388 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817bac98 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x31/0x80 kernel/entry/common.c:427
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__find_rr_leaf+0x2d4/0xd20 net/ipv6/route.c:794
Code: 08 0f 84 58 01 00 00 e8 aa 75 a0 f9 48 83 3c 24 00 74 43 e8 9e 75 a0 f9 48 8d bb 80 00 00 00 48 89 f8 48 c1 e8 03 0f b6 04 28 <84> c0 74 08 3c 03 0f 8e 49 08 00 00 44 8b a3 80 00 00 00 44 8b 74
RSP: 0018:ffffc900016af080 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff88807d3f5200 RCX: ffffc900037d9000
RDX: 0000000000040000 RSI: ffffffff87d513a2 RDI: ffff88807d3f5280
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87d5136a R11: 0000000000000000 R12: 0000000000000001
R13: ffffc900016af368 R14: 0000000000000000 R15: ffff8880879292a0
 find_rr_leaf net/ipv6/route.c:846 [inline]
 rt6_select net/ipv6/route.c:890 [inline]
 fib6_table_lookup+0x649/0xa20 net/ipv6/route.c:2174
 ip6_pol_route+0x1c5/0x11d0 net/ipv6/route.c:2210
 pol_lookup_func include/net/ip6_fib.h:579 [inline]
 fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115
 ip6_route_output_flags_noref+0x2e2/0x380 net/ipv6/route.c:2618
 ip6_route_output_flags+0x72/0x320 net/ipv6/route.c:2631
 ip6_route_output include/net/ip6_route.h:98 [inline]
 ip6_dst_lookup_tail+0x5ab/0x1620 net/ipv6/ip6_output.c:1093
 ip6_dst_lookup_flow+0x8c/0x1d0 net/ipv6/ip6_output.c:1223
 ip6_sk_dst_lookup_flow+0x598/0x9d0 net/ipv6/ip6_output.c:1261
 udpv6_sendmsg+0x18be/0x2c40 net/ipv6/udp.c:1521
 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:642
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:723
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f189290e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd0511734f R14: 00007f189290e300 R15: 0000000000022000