watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.2.39:6079] Modules linked in: irq event stamp: 11606607 hardirqs last enabled at (11606606): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11606607): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (22666): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (22666): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (22666): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (22669): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (22669): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (22669): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6079 Comm: syz.2.39 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:ieee80211_rx_h_data net/mac80211/rx.c:3264 [inline] RIP: 0010:ieee80211_rx_handlers+0x2c5d/0xc7d0 net/mac80211/rx.c:4237 Code: c4 0f 85 a5 01 00 00 e8 31 30 ad f6 4c 8b 64 24 10 48 8b 5c 24 40 48 8b 44 24 50 42 80 3c 28 00 74 08 48 89 df e8 53 ac 16 f7 <4c> 8b 3b 48 8b 84 24 b8 00 00 00 42 80 3c 28 00 48 8b 9c 24 90 00 RSP: 0018:ffffc90000007660 EFLAGS: 00000246 RAX: 1ffff92000000f8f RBX: ffffc90000007c78 RCX: ffff888027810000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000008 RBP: ffffc90000007910 R08: ffff888059afadf7 R09: 1ffff1100b35f5be R10: dffffc0000000000 R11: ffffed100b35f5bf R12: ffffc90000007c68 R13: dffffc0000000000 R14: 0000000000000080 R15: 0000000000000000 FS: 00007f30dbff66c0(0000) GS:ffff888125496000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c32e696 CR3: 000000007ae82000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ieee80211_invoke_rx_handlers net/mac80211/rx.c:4280 [inline] ieee80211_prepare_and_rx_handle+0x25a1/0x67f0 net/mac80211/rx.c:5150 __ieee80211_rx_handle_packet net/mac80211/rx.c:5423 [inline] ieee80211_rx_list+0x2b53/0x3710 net/mac80211/rx.c:5588 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5611 ieee80211_rx include/net/mac80211.h:5267 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x70 kernel/kcov.c:217 Code: de 5b e9 13 d3 5d 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d d8 ec 53 11 <65> 8b 15 f9 ec 53 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 RSP: 0018:ffffc9000b807478 EFLAGS: 00000297 RAX: ffffffff81ce8a94 RBX: 000000000000002c RCX: ffff888027810000 RDX: ffff888027810000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc9000b807700 R11: fffff52001700ee2 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000b807520 R15: 0000000000000000 perf_trace_buf_alloc+0xc4/0x280 kernel/trace/trace_event_perf.c:415 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x19e/0x420 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2ea/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:714 [inline] __netlink_lookup+0xe7/0x8b0 net/netlink/af_netlink.c:498 netlink_lookup+0xdb/0x200 net/netlink/af_netlink.c:518 netlink_getsockbyportid net/netlink/af_netlink.c:1141 [inline] netlink_unicast+0x180/0x9b0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f30ddd9bf79 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:00007f30dbff6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f30de015fa0 RCX: 00007f30ddd9bf79 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000a RBP: 00007f30dde327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f30de016038 R14: 00007f30de015fa0 R15: 00007ffd0c6ec538 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6149 Comm: kworker/u8:17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 24 da 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cf d5 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 b3 d5 RSP: 0018:ffffc9000ba6f720 EFLAGS: 00000293 RAX: ffffffff81b8dd6d RBX: 1ffff110170c84d5 RCX: ffff88802e0d0000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000ba6f860 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffff8880b86426a8 R13: dffffc0000000000 R14: ffff8880b873bd80 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125596000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005596d3311e30 CR3: 000000000e54c000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2956 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:899 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: