watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.2.71:6207] Modules linked in: irq event stamp: 13304497 hardirqs last enabled at (13304496): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (13304497): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (13105220): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13105220): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13105220): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (13105223): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13105223): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13105223): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6207 Comm: syz.2.71 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 ab cc d0 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000a07dd8 EFLAGS: 00000206 RAX: f9d3019bd8ef7b00 RBX: 0000000000000000 RCX: f9d3019bd8ef7b00 RDX: 0000000000000000 RSI: ffffffff8d8f3e0a RDI: ffffffff8bbf0760 RBP: ffffffff81738d25 R08: 0000000000000000 R09: ffffffff81738d25 R10: ffffc90000a07f98 R11: ffffffff81ac2f50 R12: 0000000000000002 R13: ffffffff8df3d4e0 R14: 0000000000000000 R15: 0000000000000246 FS: 00007effe34186c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555583b87808 CR3: 00000000227f6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:332 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3055 [inline] allocate_slab+0x96/0x350 mm/slub.c:3228 new_slab mm/slub.c:3282 [inline] ___slab_alloc+0xe94/0x18a0 mm/slub.c:4651 __slab_alloc+0x65/0x100 mm/slub.c:4770 __slab_alloc_node mm/slub.c:4846 [inline] slab_alloc_node mm/slub.c:5268 [inline] kmem_cache_alloc_noprof+0x3f9/0x6e0 mm/slub.c:5287 dst_alloc+0x105/0x170 net/core/dst.c:89 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x420 net/ipv6/route.c:3322 ndisc_send_skb+0x3f1/0x1510 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__schedule+0x1b9/0x4cc0 kernel/sched/core.c:6791 Code: d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 e4 a2 de f6 48 81 3b 9d 6e ac 57 0f 85 b7 18 00 00 <45> 85 ed 7f 54 49 8d 5e 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 RSP: 0018:ffffc9000be07460 EFLAGS: 00000246 RAX: 1ffff920017c0000 RBX: ffffc9000be00000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8bbf0740 RDI: ffffffff8bbf0700 RBP: ffffc9000be07670 R08: ffffffff8f7cda77 R09: 1ffffffff1ef9b4e R10: dffffc0000000000 R11: fffffbfff1ef9b4f R12: ffff88812623e000 R13: 0000000000000001 R14: ffff88802408bc80 R15: 1ffff11017127568 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7113 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7137 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 on_each_cpu_cond_mask+0x7a/0x80 kernel/smp.c:1044 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline] smp_text_poke_batch_finish+0xb44/0x1130 arch/x86/kernel/alternative.c:2985 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 tracepoint_add_func+0x994/0xa10 kernel/tracepoint.c:315 tracepoint_probe_register_prio kernel/tracepoint.c:464 [inline] tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:484 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:10872 perf_try_init_event+0x17f/0x870 kernel/events/core.c:12605 perf_init_event kernel/events/core.c:12703 [inline] perf_event_alloc+0x133e/0x2be0 kernel/events/core.c:12978 __do_sys_perf_event_open kernel/events/core.c:13496 [inline] __se_sys_perf_event_open+0x772/0x1d70 kernel/events/core.c:13377 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7effe258efc9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007effe3418038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007effe27e5fa0 RCX: 00007effe258efc9 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00002000000002c0 RBP: 00007effe2611f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007effe27e6038 R14: 00007effe27e5fa0 R15: 00007fffae33fc78 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 18 Comm: rcu_exp_gp_kthr Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__lock_acquire+0x2dc/0xd20 kernel/locking/lockdep.c:5175 Code: 65 8b 15 43 04 d1 10 31 f6 85 d2 40 0f 95 c6 31 d2 83 bf 14 0b 00 00 00 0f 95 c2 c1 e2 0d c1 e6 0e 09 d6 8b 54 24 1c c1 e2 0f <0f> b7 d2 09 f2 41 83 e4 03 41 c1 e4 10 41 09 d4 8b 54 24 0c 83 e2 RSP: 0018:ffffc90000007c30 EFLAGS: 00000046 RAX: 0000000000000005 RBX: ffffffff997da3c8 RCX: 0000000000000054 RDX: 0000000000000000 RSI: 0000000000004000 RDI: ffff88801ca89e40 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ae5f17 R10: dffffc0000000000 R11: fffff52000000fb0 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801ca8a970 FS: 0000000000000000(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7821edc040 CR3: 000000003135e000 CR4: 00000000003526f0 Call Trace: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 seqcount_lockdep_reader_access+0xcf/0x1c0 include/linux/seqlock.h:72 ktime_get_update_offsets_now+0x67/0x3d0 kernel/time/timekeeping.c:2556 hrtimer_update_base kernel/time/hrtimer.c:633 [inline] hrtimer_interrupt+0x132/0xaa0 kernel/time/hrtimer.c:1885 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2034 [inline] RIP: 0010:vprintk_emit+0x49d/0x590 kernel/printk/printk.c:2422 Code: 0f 84 34 ff ff ff e8 d2 ed 1f 00 fb eb 44 e8 ca ed 1f 00 e8 45 29 a6 09 4d 85 f6 74 94 e8 bb ed 1f 00 fb 48 c7 c7 c0 14 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 0b 39 RSP: 0018:ffffc900001778c0 EFLAGS: 00000293 RAX: ffffffff81a018d5 RBX: ffffffff81a0172e RCX: ffff88801ca89e40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df314c0 RBP: ffffc900001779d0 R08: ffffffff8f7cda77 R09: 1ffffffff1ef9b4e R10: dffffc0000000000 R11: fffffbfff1ef9b4f R12: 0000000000000000 R13: 0000000000000041 R14: 0000000000000200 R15: 1ffff9200002ef1c _printk+0xcf/0x120 kernel/printk/printk.c:2448 synchronize_rcu_expedited_stall+0x61/0x1170 kernel/rcu/tree_exp.h:570 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:668 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:687 [inline] rcu_exp_sel_wait_wake+0x867/0xe20 kernel/rcu/tree_exp.h:721 kthread_worker_fn+0x507/0xb60 kernel/kthread.c:1010 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245