rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (5 ticks this GP) idle=581/1/0x4000000000000000 softirq=36757/36757 fqs=5248 (detected by 1, t=10502 jiffies, g=54029, q=1680) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 13880 Comm: syz.2.2581 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:127 [inline] RIP: 0010:lockdep_hardirqs_off+0x48/0x100 kernel/locking/lockdep.c:4370 Code: 90 00 00 00 48 89 fb 65 8b 05 ec 86 60 76 a9 00 00 f0 00 74 68 83 3d 96 26 69 0c 00 75 15 48 c7 04 24 00 00 00 00 9c 8f 04 24 04 24 00 02 00 00 75 79 65 8b 05 68 8d 60 76 85 c0 74 56 65 4c RSP: 0018:ffffc90000007908 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff89a1ce1a RCX: e8ea16ac22ef7000 RDX: 0000000000000000 RSI: ffffffff8a0b1c00 RDI: ffffffff8a59e800 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f5ce28476c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4258a8bf98 CR3: 0000000062c70000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: irqentry_enter+0x27/0x50 kernel/entry/common.c:-1 sysvec_irq_work+0xa/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000007a00 EFLAGS: 00000206 RAX: e8ea16ac22ef7000 RBX: 1ffff92000000f44 RCX: e8ea16ac22ef7000 RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800 RBP: ffffc90000007ae0 R08: dffffc0000000000 R09: ffffed1017207662 R10: ffffed1017207662 R11: 1ffff11017207661 R12: ffffffff8c120c00 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] process_backlog+0x3e3/0x780 net/core/dev.c:6517 __napi_poll+0xc0/0x430 net/core/dev.c:7075 napi_poll net/core/dev.c:7142 [inline] net_rx_action+0x4a8/0x9c0 net/core/dev.c:7232 handle_softirqs+0x328/0x820 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x12f/0x220 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:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1339 Code: c0 48 8b 3c 24 e8 7d bf 68 00 eb b5 66 2e 0f 1f 84 00 00 00 00 00 90 41 57 41 56 53 66 90 e8 34 d9 57 08 e8 af 74 2a 00 fb 5b <41> 5e 41 5f c3 49 be 00 00 00 00 00 fc ff df 49 89 ff 48 8d 9f 58 RSP: 0018:ffffc9000314f568 EFLAGS: 00000286 RAX: e8ea16ac22ef7000 RBX: ffff8880b903a340 RCX: e8ea16ac22ef7000 RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800 RBP: ffffc9000314f750 R08: dffffc0000000000 R09: ffffed1017207662 R10: ffffed1017207662 R11: 1ffff11017207661 R12: 1ffff110172075ab R13: dffffc0000000000 R14: ffff888021641dc0 R15: ffff888021641dc0 __schedule+0x1464/0x4390 kernel/sched/core.c:6401 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6596 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 unwind_next_frame+0x12ac/0x1d90 arch/x86/kernel/unwind_orc.c:616 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] apparmor_sk_alloc_security+0x74/0x100 security/apparmor/lsm.c:785 security_sk_alloc+0x6a/0xa0 security/security.c:2308 sk_prot_alloc+0x101/0x210 net/core/sock.c:1869 sk_alloc+0x2f/0x310 net/core/sock.c:1922 __netlink_create+0x6b/0x2d0 net/netlink/af_netlink.c:629 netlink_create+0x3a7/0x510 net/netlink/af_netlink.c:692 __sock_create+0x47b/0x900 net/socket.c:1496 sock_create net/socket.c:1552 [inline] __sys_socket+0xe2/0x170 net/socket.c:1594 __do_sys_socket net/socket.c:1603 [inline] __se_sys_socket net/socket.c:1601 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1601 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: 0033:0x7f5ce45e0749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5ce2847038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f5ce4836fa0 RCX: 00007f5ce45e0749 RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f5ce4664f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5ce4837038 R14: 00007f5ce4836fa0 R15: 00007fffe5eafc38