rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2670 jiffies s: 849 root: 0x2/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4364 Comm: syz.0.1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x7e/0x80 kernel/kcov.c:301 Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 01 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 90 48 8b 04 24 65 48 8b 15 b4 4a 80 7e 65 8b 0d b5 4a 80 7e 81 RSP: 0018:ffffc900001e05d8 EFLAGS: 00000006 RAX: ffffffff81721886 RBX: 0000000000000001 RCX: 0000000000010100 RDX: ffff8880250a0000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900001e0738 R08: ffffffff96e61c73 R09: 1ffffffff2dcc38e R10: dffffc0000000000 R11: fffffbfff2dcc38f R12: ffff8880b8f2a5c0 R13: ffff888077640d60 R14: 0000001ba597f02f R15: dffffc0000000000 FS: 00007fe2164ba6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000001 CR3: 000000007df26000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __remove_hrtimer kernel/time/hrtimer.c:1127 [inline] __run_hrtimer kernel/time/hrtimer.c:1731 [inline] __hrtimer_run_queues+0x366/0xc90 kernel/time/hrtimer.c:1815 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 4f 57 1e f7 65 8b 05 50 08 c8 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc900001e0940 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 7502b9cb62561000 RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000000001 RBP: ffffc900001e09d0 R08: ffffffff90b102cf R09: 1ffffffff2162059 R10: dffffc0000000000 R11: fffffbfff216205a R12: dffffc0000000000 R13: ffff8880b8f28440 R14: ffff8880b8f28440 R15: 1ffff9200003c128 __mod_timer+0x925/0xd20 kernel/time/timer.c:1134 addrconf_mod_rs_timer+0x51/0xe0 net/ipv6/addrconf.c:323 addrconf_rs_timer+0x463/0x640 net/ipv6/addrconf.c:3988 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:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5680 Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04 RSP: 0018:ffffc90004607720 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 7502b9cb62561000 RDX: 0000000000000000 RSI: ffffffff8a8c2920 RDI: ffffffff8adf42e0 RBP: ffffc90004607838 R08: dffffc0000000000 R09: 1ffffffff2162048 R10: dffffc0000000000 R11: fffffbfff2162049 R12: 0000000000000001 R13: 1ffff920008c0ef0 R14: 0000000000000246 R15: dffffc0000000000 rcu_lock_acquire include/linux/rcupdate.h:350 [inline] rcu_read_lock include/linux/rcupdate.h:791 [inline] is_bpf_text_address+0x43/0x2a0 kernel/bpf/core.c:735 kernel_text_address+0x9c/0xd0 kernel/extable.c:125 __kernel_text_address+0x9/0x30 kernel/extable.c:79 unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323 arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 __kfence_alloc+0x2d3/0x3d0 mm/kfence/core.c:1066 kfence_alloc include/linux/kfence.h:128 [inline] slab_alloc_node mm/slub.c:3283 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc_lru+0x279/0x2e0 mm/slub.c:3390 __d_alloc+0x2e/0x6e0 fs/dcache.c:1774 d_alloc+0x46/0x250 fs/dcache.c:1854 lookup_one_qstr_excl+0xc6/0x240 fs/namei.c:1609 do_unlinkat+0x199/0x580 fs/namei.c:4382 __do_sys_unlink fs/namei.c:4446 [inline] __se_sys_unlink fs/namei.c:4444 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4444 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: 0033:0x7fe21559de99 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:00007fe2164ba028 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007fe215826090 RCX: 00007fe21559de99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000000c0 RBP: 00007fe215633eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe215826128 R14: 00007fe215826090 R15: 00007ffc8e19dd88