rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2645 jiffies s: 61121 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: 14904 Comm: syz.5.2628 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:check_preemption_disabled+0x1/0x110 lib/smp_processor_id.c:13 Code: c0 a3 bc 8c 4c 89 f6 e8 5d 99 0c fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 40 5f df 8a 48 c7 c6 80 5f df 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 RSP: 0018:ffffc90003ec7398 EFLAGS: 00000082 RAX: 0000000000000001 RBX: ffff8880b8f35800 RCX: b0dfb582355c4600 RDX: ffffc9001c1ab000 RSI: ffffffff8a94e400 RDI: ffffffff8adf5fa0 RBP: ffffc90003ec7468 R08: ffffffff8e2118af R09: 1ffffffff1c42315 R10: dffffc0000000000 R11: fffffbfff1c42316 R12: dffffc0000000000 R13: 0000000000000001 R14: 4000000000000002 R15: 0000000000000000 FS: 00007feda01d56c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff27a6f4ff8 CR3: 000000001dfd1000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ct_dynticks_nmi_nesting include/linux/context_tracking_state.h:92 [inline] ct_nmi_exit+0x89/0x1c0 kernel/context_tracking.c:-1 ct_irq_exit_irqson+0xaf/0x170 kernel/context_tracking.c:422 trace_irq_enable_rcuidle+0xd8/0x140 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:set_pte_at arch/x86/include/asm/jump_label.h:-1 [inline] RIP: 0010:copy_present_pte mm/memory.c:1000 [inline] RIP: 0010:copy_pte_range mm/memory.c:1091 [inline] RIP: 0010:copy_pmd_range mm/memory.c:1177 [inline] RIP: 0010:copy_pud_range mm/memory.c:1214 [inline] RIP: 0010:copy_p4d_range mm/memory.c:1238 [inline] RIP: 0010:copy_page_range+0x197c/0x3a60 mm/memory.c:1332 Code: 00 42 80 3c 38 00 4c 8b b4 24 f0 00 00 00 74 08 4c 89 f7 e8 d6 76 14 00 4d 8b 36 4c 8b 6c 24 58 e9 f2 0b 00 00 e8 74 45 c3 ff <4c> 8b 64 24 28 48 89 5c 24 60 48 8b 5c 24 60 48 8b 84 24 98 00 00 RSP: 0018:ffffc90003ec7560 EFLAGS: 00000246 RAX: b0dfb582355c4600 RBX: 8000000072e19007 RCX: b0dfb582355c4600 RDX: 0000000000000005 RSI: ffffffff8a8c29a0 RDI: ffffffff8adf5fa0 RBP: ffffc90003ec7870 R08: ffffffff8e2118af R09: 1ffffffff1c42315 R10: dffffc0000000000 R11: fffffbfff1c42316 R12: 1ffffd40003970c9 R13: ffff8880772785a8 R14: ffff88807d4a8780 R15: dffffc0000000000 dup_mmap kernel/fork.c:703 [inline] dup_mm kernel/fork.c:1548 [inline] copy_mm+0xeb0/0x1680 kernel/fork.c:1597 copy_process+0x19a6/0x40c0 kernel/fork.c:2358 kernel_clone+0x24b/0x900 kernel/fork.c:2765 __do_sys_clone kernel/fork.c:2906 [inline] __se_sys_clone kernel/fork.c:2890 [inline] __x64_sys_clone+0x1a7/0x220 kernel/fork.c:2890 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: 0033:0x7feda1f9e0d9 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:00007feda01d4fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007feda2226090 RCX: 00007feda1f9e0d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011 RBP: 00007feda2035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007feda2226128 R14: 00007feda2226090 R15: 00007ffd6f957c98