rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=c47/1/0x4000000000000002 softirq=12628/12629 fqs=5172 (detected by 1, t=10502 jiffies, g=16465, q=497) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6559 Comm: syz.1.609 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:hlock_class kernel/locking/lockdep.c:197 [inline] RIP: 0010:mark_lock+0x9c/0x320 kernel/locking/lockdep.c:4569 Code: 89 c7 41 81 e7 ff 1f 00 00 c1 e8 03 25 f8 03 00 00 48 8d b8 c0 30 1d 90 be 08 00 00 00 e8 3c 75 60 00 4c 0f a3 3d 44 76 bf 0e <73> 10 4b 8d 04 7f c1 e0 06 4c 8d b8 80 af b5 8f eb 24 48 c7 c0 80 RSP: 0018:ffffc90000007940 EFLAGS: 00000057 RAX: 0000000000000001 RBX: ffff888021bfd940 RCX: ffffffff815dba74 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d3188 RBP: 0000000000000002 R08: ffffffff901d318f R09: 1ffffffff203a631 R10: dffffc0000000000 R11: fffffbfff203a632 R12: 0000000000000004 R13: dffffc0000000000 R14: ffff888021bfe458 R15: 0000000000000652 FS: 00007fbaa64216c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000016c0 CR3: 0000000062659000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: mark_held_locks kernel/locking/lockdep.c:4193 [inline] __trace_hardirqs_on_caller kernel/locking/lockdep.c:4211 [inline] lockdep_hardirqs_on_prepare+0x249/0x770 kernel/locking/lockdep.c:4278 trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49 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 e2 f0 9c 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:ffffc90000007b00 EFLAGS: 00000206 RAX: b975a2c8d56c0500 RBX: 1ffff92000000f64 RCX: b975a2c8d56c0500 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f800 RBP: ffffc90000007bd8 R08: ffffffff901d318f R09: 1ffffffff203a631 R10: dffffc0000000000 R11: fffffbfff203a632 R12: ffffffff8c322f00 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] ieee80211_iterate_active_interfaces_atomic+0x132/0x140 net/mac80211/util.c:831 mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4eb/0xb70 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766 handle_softirqs+0x339/0x830 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:unwind_next_frame+0xa3d/0x1d90 arch/x86/kernel/unwind_orc.c:-1 Code: 48 8b 44 24 68 42 0f b6 04 28 84 c0 4c 8b 74 24 28 0f 85 40 10 00 00 41 c6 07 00 ba 10 00 00 00 4c 89 f7 31 f6 e8 13 19 89 00 <48> 8b 3c 24 e9 ec 04 00 00 48 89 54 24 50 48 8d 7b 08 48 89 f8 48 RSP: 0018:ffffc9000332ef68 EFLAGS: 00000202 RAX: ffffc9000332f078 RBX: ffffc9000332f028 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000332f088 RBP: ffffc9000332f070 R08: ffffc9000332f087 R09: ffffc9000332f078 R10: dffffc0000000000 R11: fffff52000665e11 R12: 1ffffffff1d2d1eb R13: dffffc0000000000 R14: ffffc9000332f078 R15: ffffc9000332f05d arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 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_array include/linux/slab.h:647 [inline] genl_family_rcv_msg_attrs_parse+0xa3/0x290 net/netlink/genetlink.c:535 genl_start+0x2b2/0x4a0 net/netlink/genetlink.c:576 __netlink_dump_start+0x3e8/0x700 net/netlink/af_netlink.c:2378 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:678 [inline] genl_family_rcv_msg net/netlink/genetlink.c:772 [inline] genl_rcv_msg+0xa1d/0xf90 net/netlink/genetlink.c:792 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 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: 0033:0x7fbaa81c7799 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:00007fbaa6421028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fbaa8440fa0 RCX: 00007fbaa81c7799 RDX: 000000002000c884 RSI: 00002000000016c0 RDI: 000000000000000a RBP: 00007fbaa825dbd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbaa8441038 R14: 00007fbaa8440fa0 R15: 00007ffe36fb6b88