rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=8a3/1/0x4000000000000000 softirq=10020/10021 fqs=5206 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5844 (detected by 1, t=10502 jiffies, g=12109, q=1581) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5844 Comm: syz.1.469 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:native_apic_msr_eoi_write+0xb/0x10 arch/x86/include/asm/apic.h:214 Code: 8b 06 bf f0 03 00 00 89 de 5b 41 5e 41 5f ff e0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b9 0b 08 00 00 31 c0 31 d2 0f 30 0f 1f 40 00 81 ff cf 00 00 00 7f 0c 83 ff 20 74 2a 83 ff 30 74 RSP: 0018:ffffc90000007d40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff8be339c8 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: 0000000000000000 R08: ffffffff8f0ea008 R09: ffffffff8f0ea018 R10: ffffffff8f0ea010 R11: ffffffff8f0ea003 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fe6465726c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000cf3d CR3: 0000000023c8b000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_eoi arch/x86/include/asm/apic.h:400 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:446 [inline] __sysvec_irq_work+0x51/0x240 arch/x86/kernel/irq_work.c:19 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x4a/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline] RIP: 0010:handle_softirqs+0x1a9/0x830 kernel/softirq.c:564 Code: 24 78 44 89 64 24 28 0f b7 db 48 c7 c7 00 10 2a 8a e8 2b 89 73 08 65 66 c7 05 51 47 ba 7e 00 00 e8 9c 0e 36 00 fb 89 5c 24 34 ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 85 d2 00 00 00 RSP: 0018:ffffc90000007e20 EFLAGS: 00000282 RAX: 3c4b6833ca16ab00 RBX: 0000000000000200 RCX: 3c4b6833ca16ab00 RDX: dffffc0000000000 RSI: ffffffff8a2b2800 RDI: ffffffff8a79fe00 RBP: ffffc90000007f30 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 000000000000000a R13: 0000000000000000 R14: ffff888021250000 R15: dffffc0000000000 __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:__rcu_read_unlock+0x73/0xd0 kernel/rcu/tree_plugin.h:422 Code: 84 c0 75 5f 41 83 3e 00 75 20 43 0f b6 04 3c 84 c0 75 3a 8b 03 3d 00 00 00 40 73 0a 5b 41 5c 41 5d 41 5e 41 5f c3 0f 0b eb f2 58 00 00 00 eb d9 89 d9 80 e1 07 80 c1 03 38 c1 7c ac 49 89 fe RSP: 0018:ffffc9000325ee98 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff88802125043c RCX: 0000000000080000 RDX: ffffc9000ee4b000 RSI: 0000000000005579 RDI: ffff888021250000 RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff203aa18 R10: dffffc0000000000 R11: fffffbfff203aa19 R12: 1ffff1100424a087 R13: 0000000000000001 R14: ffff888021250440 R15: dffffc0000000000 rcu_read_unlock include/linux/rcupdate.h:772 [inline] pfn_valid include/linux/mmzone.h:-1 [inline] __virt_addr_valid+0x3b8/0x470 arch/x86/mm/physaddr.c:65 check_heap_object mm/usercopy.c:228 [inline] __check_object_size+0xa8/0x410 mm/usercopy.c:286 check_object_size include/linux/thread_info.h:199 [inline] check_copy_size include/linux/thread_info.h:232 [inline] copy_to_user include/linux/uaccess.h:199 [inline] bpf_verifier_vlog+0x1a7/0x350 kernel/bpf/verifier.c:303 verbose+0x1f2/0x2b0 kernel/bpf/verifier.c:348 print_verifier_state+0xde8/0x2110 kernel/bpf/verifier.c:715 do_check+0x476e/0xeb00 kernel/bpf/verifier.c:11260 do_check_common+0xe82/0x16e0 kernel/bpf/verifier.c:13512 do_check_main kernel/bpf/verifier.c:13575 [inline] bpf_check+0x9c84/0xf270 kernel/bpf/verifier.c:14146 bpf_prog_load+0xfec/0x1510 kernel/bpf/syscall.c:2354 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 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: 0033:0x7fe648339dd9 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:00007fe646572028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fe6485b3090 RCX: 00007fe648339dd9 RDX: 0000000000000048 RSI: 000020000000e000 RDI: 0000000000000005 RBP: 00007fe6483cfd69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe6485b3128 R14: 00007fe6485b3090 R15: 00007ffc918025d8 task:syz.1.469 state:R running task stack:24240 pid: 5844 ppid: 4188 flags:0x0000400c Call Trace: