rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 6367 jiffies s: 977 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: 4377 Comm: syz.2.3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__hrtimer_get_next_event kernel/time/hrtimer.c:608 [inline] RIP: 0010:hrtimer_update_next_event kernel/time/hrtimer.c:633 [inline] RIP: 0010:hrtimer_interrupt+0x4a8/0x980 kernel/time/hrtimer.c:1880 Code: 74 0a 48 8b 7c 24 58 e8 b6 39 61 00 41 83 e7 0f 48 c7 43 68 00 00 00 00 48 89 df 31 f6 44 89 fa 48 b9 ff ff ff ff ff ff ff 7f f3 f5 ff ff 49 89 c7 48 89 c7 4c 89 ee e8 25 13 10 00 4d 39 ef RSP: 0018:ffffc90000007098 EFLAGS: 00000046 RAX: 1ffff110171c54c5 RBX: ffff8880b8e2a5c0 RCX: 7fffffffffffffff RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8880b8e2a5c0 RBP: dffffc0000000000 R08: ffff888017746177 R09: ffff888017746168 R10: dffffc0000000000 R11: ffffed1002ee8c2f R12: ffff8880b8e2a614 R13: 7fffffffffffffff R14: ffff8880b8e2a728 R15: 0000000000000001 FS: 00007fe46ff336c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003ff6 CR3: 0000000028579000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:stack_trace_consume_entry+0x62/0x270 kernel/stacktrace.c:89 Code: 4d 89 f5 49 c1 ed 03 41 0f b6 44 15 00 84 c0 0f 85 1d 01 00 00 45 3b 0e 73 3a 48 8d 5f 0c 49 89 df 49 c1 ef 03 41 0f b6 04 17 <84> c0 0f 85 42 01 00 00 44 8b 23 45 85 e4 74 21 41 ff cc 41 0f b6 RSP: 0018:ffffc90000007298 EFLAGS: 00000a03 RAX: 0000000000000000 RBX: ffffc900000073ac RCX: 0000000000000100 RDX: dffffc0000000000 RSI: ffffffff8171c4ac RDI: ffffc900000073a0 RBP: 1ffff92000000e76 R08: ffffc900000073b0 R09: 0000000000000009 R10: dffffc0000000000 R11: fffff52000000e69 R12: ffff888079db0000 R13: 1ffff92000000e75 R14: ffffc900000073a8 R15: 1ffff92000000e75 arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ref_tracker_alloc+0x14f/0x490 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:4049 [inline] netdev_hold include/linux/netdevice.h:4078 [inline] dst_init+0xb1/0x400 net/core/dst.c:52 dst_alloc+0x12a/0x160 net/core/dst.c:92 ip6_dst_alloc net/ipv6/route.c:345 [inline] icmp6_dst_alloc+0x7c/0x490 net/ipv6/route.c:3312 ndisc_send_skb+0x41b/0x1520 net/ipv6/ndisc.c:493 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3979 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:finish_task_switch+0x267/0x8e0 kernel/sched/core.c:5124 Code: d1 08 85 c0 0f 84 38 01 00 00 48 85 db 0f 85 57 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 33 6f db 08 e8 ae 05 2f 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900042b7900 EFLAGS: 00000286 RAX: 365bb25b2abe5100 RBX: 0000000000000000 RCX: 365bb25b2abe5100 RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adee1a0 RBP: ffffc900042b7950 R08: ffff8880b8e3ad03 R09: 1ffff110171c75a0 R10: dffffc0000000000 R11: ffffed10171c75a1 R12: ffff888079db0000 R13: 1ffff110171c76fa R14: dffffc0000000000 R15: ffff8880b8e3b7d0 context_switch kernel/sched/core.c:5248 [inline] __schedule+0x1087/0x4030 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 futex_wait_queue+0x134/0x1b0 kernel/futex/waitwake.c:355 futex_wait+0x1e5/0x5c0 kernel/futex/waitwake.c:656 do_futex+0x310/0x320 kernel/futex/syscalls.c:134 __do_sys_futex kernel/futex/syscalls.c:211 [inline] __se_sys_futex+0x381/0x410 kernel/futex/syscalls.c:192 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe46ef9ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe46ff330e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fe46f215fa8 RCX: 00007fe46ef9ce59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe46f215fa8 RBP: 00007fe46f215fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe46f216038 R14: 00007ffc48f05a90 R15: 00007ffc48f05b78