rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=fc5/1/0x4000000000000002 softirq=128346/128347 fqs=2101 (detected by 1, t=10502 jiffies, g=184665, q=1311) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9861 Comm: syz.6.8111 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:check_preemption_disabled+0x26/0x110 lib/smp_processor_id.c:16 Code: 7a 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05 f9 90 41 76 65 8b 0d 62 eb 41 76 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 RSP: 0018:ffffc90000006f98 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000103 RDX: 0000000000000100 RSI: ffffffff8a7a4520 RDI: ffffffff8a7a44e0 RBP: ffffc90000007130 R08: ffffc900000070b7 R09: ffffc900000070a0 R10: dffffc0000000000 R11: fffff52000000e17 R12: 1ffff92000000e10 R13: ffffc90000007180 R14: 0000000000000130 R15: ffff88804ea7df80 FS: 00007f78ad6a56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000005ed8a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:331 [inline] rcu_is_watching+0x11/0xa0 kernel/rcu/tree.c:1123 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline] rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309 __perf_output_begin kernel/events/ring_buffer.c:170 [inline] perf_output_begin_forward+0x1af/0xa30 kernel/events/ring_buffer.c:271 __perf_event_output kernel/events/core.c:7814 [inline] perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7832 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9525 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10057 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 f2 0f 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc90000007780 EFLAGS: 00000206 RAX: 79fd616ef74e3700 RBX: 1ffff92000000ef4 RCX: 79fd616ef74e3700 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4540 RBP: ffffc90000007860 R08: ffffffff901ef1c7 R09: 1ffffffff203de38 R10: dffffc0000000000 R11: fffffbfff203de39 R12: ffffffff8c323400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] ndisc_send_skb+0xd3b/0x1410 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3966 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x336/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__tlb_adjust_range include/asm-generic/tlb.h:330 [inline] RIP: 0010:tlb_flush_pte_range include/asm-generic/tlb.h:543 [inline] RIP: 0010:zap_pte_range mm/memory.c:1370 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1505 [inline] RIP: 0010:zap_pud_range mm/memory.c:1534 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1555 [inline] RIP: 0010:unmap_page_range+0xb71/0x2410 mm/memory.c:1576 Code: 43 80 3c 26 00 74 0a 48 8b 7c 24 10 e8 28 c3 10 00 48 8b 44 24 18 4c 89 38 48 8b 7c 24 48 49 89 fe 49 c1 ee 03 43 80 3c 26 00 <74> 0a e8 88 c2 10 00 48 8b 7c 24 48 4c 8b 3f 48 8b 44 24 50 49 39 RSP: 0018:ffffc900032af6a0 EFLAGS: 00000246 RAX: ffff888023cb8678 RBX: 1ffff92000655f30 RCX: 0000000000080000 RDX: ffffc90015992000 RSI: 000000000003bb40 RDI: ffffc900032af970 RBP: ffffc900032af810 R08: ffff88803a958007 R09: 1ffff1100752b000 R10: dffffc0000000000 R11: ffffed100752b001 R12: dffffc0000000000 R13: ffffea00007ece40 R14: 1ffff92000655f2e R15: 0000000000000000 unmap_vmas+0x131/0x250 mm/memory.c:1653 exit_mmap+0x3b9/0x640 mm/mmap.c:3216 __mmput+0x115/0x390 kernel/fork.c:1133 copy_process+0x2f76/0x3e70 kernel/fork.c:2545 kernel_clone+0x23f/0x990 kernel/fork.c:2682 __do_sys_clone kernel/fork.c:2799 [inline] __se_sys_clone kernel/fork.c:2783 [inline] __x64_sys_clone+0x19a/0x210 kernel/fork.c:2783 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f78af46e159 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:00007f78ad6a4fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f78af6f6090 RCX: 00007f78af46e159 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000022023400 RBP: 00007f78af50503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f78af6f6128 R14: 00007f78af6f6090 R15: 00007fff6ea65268