rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2647 jiffies s: 93405 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: 5891 Comm: syz-executor.0 Not tainted 6.5.0-syzkaller-03968-ge4da8c78973c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:__find_rr_leaf+0x23b/0xe00 net/ipv6/route.c:792 Code: 84 c0 0f 85 a3 0a 00 00 45 88 65 14 e8 5e 23 96 f8 48 8d 7b 08 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 97 09 00 00 48 8b 5b 08 90 ff 46 01 31 ff 41 89 c4 89 c6 e8 a4 1e 96 f8 45 85 e4 0f 85 RSP: 0018:ffffc90000006dc0 EFLAGS: 00000246 RAX: 1ffff1100762e581 RBX: ffff88803c4c3c00 RCX: 0000000000000100 RDX: ffff888045f59dc0 RSI: ffffffff88f06422 RDI: ffff88803b172c08 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000010000000a R12: ffff88803b172c64 R13: ffffc900000070c8 R14: 0000000000000000 R15: ffff88803b172cb8 FS: 00007f73cd7706c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdcc6f77978 CR3: 00000000a4241000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_rr_leaf net/ipv6/route.c:848 [inline] rt6_select net/ipv6/route.c:892 [inline] fib6_table_lookup+0x57e/0xa30 net/ipv6/route.c:2180 ip6_pol_route+0x1c1/0x1220 net/ipv6/route.c:2216 pol_lookup_func include/net/ip6_fib.h:614 [inline] fib6_rule_lookup+0x4ae/0x5f0 net/ipv6/fib6_rules.c:121 ip6_route_output_flags_noref net/ipv6/route.c:2624 [inline] ip6_route_output_flags+0x1d2/0x650 net/ipv6/route.c:2636 ip6_dst_lookup_tail.constprop.0+0x9d7/0x1600 net/ipv6/ip6_output.c:1137 ip6_dst_lookup_flow+0x99/0x1c0 net/ipv6/ip6_output.c:1240 sctp_v6_get_dst+0x149e/0x1fd0 net/sctp/ipv6.c:385 sctp_transport_route+0x12c/0x350 net/sctp/transport.c:455 sctp_packet_config+0xb96/0xe70 net/sctp/output.c:103 sctp_packet_singleton+0x16f/0x370 net/sctp/outqueue.c:777 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x54c/0x3340 net/sctp/outqueue.c:1212 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1818 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline] sctp_do_sm+0x1786/0x5c40 net/sctp/sm_sideeffect.c:1169 sctp_generate_timeout_event+0x1b3/0x3c0 net/sctp/sm_sideeffect.c:295 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:put_cpu_partial+0x12b/0x220 mm/slub.c:2722 Code: 28 75 71 48 c7 43 28 00 00 00 00 48 c7 c6 74 30 db 81 48 89 df e8 55 41 8c ff 4d 85 e4 75 46 9c 58 f6 c4 02 0f 85 b0 00 00 00 <4d> 85 ed 74 21 5b 4c 89 ee 48 89 ef 5d 41 5c 41 5d 41 5e 41 5f e9 RSP: 0018:ffffc900052b7940 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff8880b9846080 RCX: 1ffffffff22f8ade RDX: 0000000000000000 RSI: ffffffff8a6c8960 RDI: ffffffff8ac88640 RBP: ffff888019278500 R08: 0000000000000001 R09: fffffbfff22f63d5 R10: ffffffff917b1eaf R11: 0000000000093717 R12: 0000000000000200 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18b/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] __kmem_cache_alloc_node+0x19b/0x350 mm/slub.c:3509 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1076 kmalloc include/linux/slab.h:582 [inline] kzalloc include/linux/slab.h:703 [inline] task_numa_work+0xc0c/0x1290 kernel/sched/fair.c:3252 task_work_run+0x14d/0x240 kernel/task_work.c:179 get_signal+0x1075/0x2770 kernel/signal.c:2657 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f73cca7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f73cd7700c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: fffffffffffffe00 RBX: 00007f73ccb9c050 RCX: 00007f73cca7cae9 RDX: 000000000000006f RSI: 0000000000000084 RDI: 0000000000000009 RBP: 00007f73ccac847a R08: 0000000020000180 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f73ccb9c050 R15: 00007fffc62ce0d8