rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2643 jiffies s: 121305 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3669 Comm: syz-executor.4 Not tainted 6.8.0-rc4-syzkaller-00188-g166c2c8a6a4d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:__find_rr_leaf+0x37c/0x8e0 net/ipv6/route.c:795
Code: ff df 4c 8b 74 24 48 4c 8b 6c 24 40 49 83 c4 08 4c 89 e0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 e7 e8 18 4a e3 f7 4d 8b 24 24 <e8> 0f 75 54 01 89 c3 31 ff 89 c6 e8 e4 30 81 f7 85 db 74 1b e8 9b
RSP: 0018:ffffc90000006a80 EFLAGS: 00000246
RAX: 1ffff11010ab5401 RBX: ffff8880855aa0a8 RCX: ffff888023658000
RDX: 0000000000000101 RSI: 00000000fffffffd RDI: 00000000fffffffd
RBP: ffffc90000006bf8 R08: ffffffff8a124838 R09: ffffc90000006d30
R10: ffffc90000006d20 R11: fffff52000000d6a R12: ffff888031f71400
R13: 0000000000000000 R14: ffffc90000006d00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000065fc0 CR3: 000000000df32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 find_rr_leaf net/ipv6/route.c:851 [inline]
 rt6_select net/ipv6/route.c:895 [inline]
 fib6_table_lookup+0x413/0xbb0 net/ipv6/route.c:2183
 ip6_pol_route+0x268/0x14b0 net/ipv6/route.c:2219
 pol_lookup_func include/net/ip6_fib.h:576 [inline]
 fib6_rule_lookup+0x3c2/0x790 net/ipv6/fib6_rules.c:121
 ip6_route_output_flags_noref net/ipv6/route.c:2627 [inline]
 ip6_route_output_flags+0x38e/0x610 net/ipv6/route.c:2639
 ip6_dst_lookup_tail+0x26b/0x11a0 net/ipv6/ip6_output.c:1147
 ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1250
 sctp_v6_get_dst+0x1054/0x1e20 net/sctp/ipv6.c:384
 sctp_transport_route+0x12c/0x2e0 net/sctp/transport.c:455
 sctp_packet_config+0x460/0xdb0 net/sctp/output.c:103
 sctp_outq_select_transport+0x474/0x580 net/sctp/outqueue.c:869
 sctp_outq_flush_ctrl net/sctp/outqueue.c:903 [inline]
 sctp_outq_flush+0x4db/0x3e60 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_generate_timeout_event+0x22e/0x360 net/sctp/sm_sideeffect.c:295
 call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x621/0x830 kernel/time/timer.c:2038
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
 __do_softirq+0x2bb/0x942 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:236 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x10/0x90 kernel/kcov.c:304
Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 65 48 8b 15 70 4e 70 7e <65> 8b 05 71 4e 70 7e a9 00 01 ff 00 74 10 a9 00 01 00 00 74 5b 83
RSP: 0018:ffffc90008af7190 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90008af71c0 RCX: ffff888023658000
RDX: ffff888023658000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff81404bc7 R09: ffffffff814066c0
R10: 0000000000000003 R11: ffff888023658000 R12: ffff888023658000
R13: ffffffff818043b0 R14: dffffc0000000000 R15: ffffc90008af71c0
 unwind_done arch/x86/include/asm/unwind.h:50 [inline]
 unwind_get_return_address+0x37/0xc0 arch/x86/kernel/unwind_orc.c:366
 arch_stack_walk+0x124/0x1b0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x117/0x1d0 kernel/stacktrace.c:122
 save_stack+0xfa/0x1f0 mm/page_owner.c:129
 __reset_page_owner+0x44/0x2d0 mm/page_owner.c:150
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
 free_unref_page_list+0x5a3/0x850 mm/page_alloc.c:2532
 release_pages+0x2744/0x2a80 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu+0x34c/0x4e0 mm/mmu_gather.c:300
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:392
 exit_mmap+0x4b6/0xd40 mm/mmap.c:3292
 __mmput+0x115/0x3c0 kernel/fork.c:1343
 exit_mm+0x21f/0x310 kernel/exit.c:569
 do_exit+0x9af/0x2740 kernel/exit.c:858
 do_group_exit+0x206/0x2c0 kernel/exit.c:1020
 get_signal+0x176d/0x1850 kernel/signal.c:2893
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xc8/0x370 kernel/entry/common.c:212
 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f3b3247dda9
Code: Unable to access opcode bytes at 0x7f3b3247dd7f.
RSP: 002b:00007f3b331830c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: 0000000000000001 RBX: 00007f3b325abf80 RCX: 00007f3b3247dda9
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007f3b324ca47a R08: 00000000200000c0 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f3b325abf80 R15: 00007ffeb0b106c8
 </TASK>