rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2676 jiffies s: 462125 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: 23185 Comm: syz.6.14605 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:debug_smp_processor_id+0x0/0x10 lib/smp_processor_id.c:60 Code: 8c 4c 89 f6 e8 81 bc 0b fa e9 64 ff ff ff 48 c7 c7 60 9e bc 8c 4c 89 f6 e8 6d bc 0b fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc <48> c7 c7 00 0f df 8a 48 c7 c6 40 0f df 8a eb 00 55 41 57 41 56 53 RSP: 0018:ffffc9000c7d71c0 EFLAGS: 00000046 RAX: ffffffff81a599fe RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9001039a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: 0000000000000014 R08: ffffffff8e1fd76f R09: 1ffffffff1c3faed R10: dffffc0000000000 R11: fffffbfff1c3faee R12: ffffe8ffffdd7000 R13: ffffffff8cb7fc20 R14: ffff8880b8f354b0 R15: dffffc0000000000 FS: 00007f6c1f5d46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31119ff8 CR3: 0000000053b46000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000000000008d24 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_swevent_put_recursion_context kernel/events/core.c:9731 [inline] perf_trace_run_bpf_submit+0x10a/0x1c0 kernel/events/core.c:9998 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0xd3/0x140 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:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685 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 e2 33 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc9000c7d73e0 EFLAGS: 00000206 RAX: a4b02b527878ad00 RBX: 1ffff920018fae84 RCX: a4b02b527878ad00 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0f60 RBP: ffffc9000c7d74d8 R08: ffffffff90af6247 R09: 1ffffffff215ec48 R10: dffffc0000000000 R11: fffffbfff215ec49 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] __folio_memcg_unlock+0xea/0x110 mm/memcontrol.c:2151 page_remove_rmap+0x7e3/0xea0 mm/rmap.c:1462 zap_pte_range mm/memory.c:1451 [inline] zap_pmd_range mm/memory.c:1572 [inline] zap_pud_range mm/memory.c:1601 [inline] zap_p4d_range mm/memory.c:1622 [inline] unmap_page_range+0x114a/0x2500 mm/memory.c:1643 unmap_vmas+0x260/0x390 mm/memory.c:1728 exit_mmap+0x20d/0x960 mm/mmap.c:3250 __mmput+0x118/0x3c0 kernel/fork.c:1205 copy_process+0x2c31/0x4030 kernel/fork.c:2614 kernel_clone+0x24b/0x900 kernel/fork.c:2762 __do_sys_clone kernel/fork.c:2903 [inline] __se_sys_clone kernel/fork.c:2887 [inline] __x64_sys_clone+0x1a7/0x220 kernel/fork.c:2887 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: 0033:0x7f6c1e79c799 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:00007f6c1f5d3fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f6c1ea16180 RCX: 00007f6c1e79c799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000001000 RBP: 00007f6c1e832bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f6c1ea16218 R14: 00007f6c1ea16180 R15: 00007ffe51c3aaa8