rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2657 jiffies s: 49841 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: 9027 Comm: syz-executor.1 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:rcu_rnp_online_cpus kernel/rcu/tree.c:4233 [inline]
RIP: 0010:rcu_rdp_cpu_online kernel/rcu/tree.c:4243 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0xbf/0x120 kernel/rcu/tree.c:4284
Code: 18 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 d4 bf 7a 00 48 8b 1b 48 83 c3 70 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 b7 bf 7a 00 4c 23 3b 75 1a 48 c7 c7 00 66 13 8e
RSP: 0018:ffffc90000006990 EFLAGS: 00000246
RAX: 1ffffffff1c26bae RBX: ffffffff8e135d70 RCX: 0000000000000104
RDX: ffff8880481cbb80 RSI: ffffffff8bfe7240 RDI: ffff8880b943d860
RBP: ffffc90000006b38 R08: ffffffff8a1372cc R09: ffffc90000006c70
R10: ffffc90000006c60 R11: fffff52000000d5a R12: ffff8880914c8800
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f216bcd5000 CR3: 000000000df32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
 __find_rr_leaf+0x395/0x8e0 net/ipv6/route.c:795
 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:2192
 ip6_pol_route+0x268/0x1520 net/ipv6/route.c:2228
 pol_lookup_func include/net/ip6_fib.h:614 [inline]
 fib6_rule_lookup+0x3c2/0x790 net/ipv6/fib6_rules.c:121
 ip6_route_output_flags_noref net/ipv6/route.c:2636 [inline]
 ip6_route_output_flags+0x38e/0x610 net/ipv6/route.c:2648
 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_packet_singleton+0x14d/0x320 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
 sctp_outq_flush+0x6f1/0x3e60 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:check_preemption_disabled+0x37/0x120
Code: 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 1d 7c 93 9b 74 65 8b 05 71 93 9b 74 a9 ff ff ff 7f 74 26 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 0f 85 cd 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e
RSP: 0018:ffffc900148d72c8 EFLAGS: 00000206
RAX: dddfbe170ebcb700 RBX: 0000000000000000 RCX: ffff8880481cbb80
RDX: ffff8880481cbb80 RSI: ffffffff8bfe7240 RDI: ffffffff8bfe7200
RBP: 0000000000000001 R08: ffffffff8201aed8 R09: 1ffffffff2592a84
R10: dffffc0000000000 R11: fffffbfff2592a85 R12: dffffc0000000000
R13: 000000000005359f R14: ffffffff8201ad16 R15: ffff88813fff9140
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700
 rcu_read_unlock_sched include/linux/rcupdate.h:861 [inline]
 pfn_valid+0x2c1/0x440 include/linux/mmzone.h:2026
 page_table_check_clear+0x21/0x730 mm/page_table_check.c:68
 zap_pte_range mm/memory.c:1452 [inline]
 zap_pmd_range mm/memory.c:1597 [inline]
 zap_pud_range mm/memory.c:1626 [inline]
 zap_p4d_range mm/memory.c:1647 [inline]
 unmap_page_range+0x1f79/0x3600 mm/memory.c:1668
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1758
 exit_mmap+0x2c6/0xd40 mm/mmap.c:3279
 __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: 0033:0x7f4cc627dda9
Code: Unable to access opcode bytes at 0x7f4cc627dd7f.
RSP: 002b:00007f4cc55ff0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: 0000000000000001 RBX: 00007f4cc63ac050 RCX: 00007f4cc627dda9
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f4cc62ca47a R08: 00000000200000c0 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f4cc63ac050 R15: 00007ffe9bb33058
 </TASK>