watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.2.9784:4334] Modules linked in: irq event stamp: 13918461 hardirqs last enabled at (13918460): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 hardirqs last disabled at (13918461): [] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118 softirqs last enabled at (4550): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (4550): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (4550): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 softirqs last disabled at (4553): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (4553): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (4553): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 CPU: 1 PID: 4334 Comm: syz.2.9784 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:kcov_remote_stop+0x24/0x6e0 kernel/kcov.c:1056 Code: e9 45 89 e0 eb 8c 55 41 57 41 56 41 55 41 54 53 48 83 ec 38 65 4c 8b 35 2a d8 7f 7e 65 8b 05 2b d8 7f 7e a9 00 00 ff 00 74 0f <48> 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 c7 04 24 00 00 00 RSP: 0018:ffffc900001e0970 EFLAGS: 00000206 RAX: 68368363eb015200 RBX: 00000000ffffffff RCX: 68368363eb015200 RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1ba0 RBP: ffffc900001e0bf0 R08: ffffffff8e1ffbef R09: 1ffffffff1c3ff7d R10: dffffc0000000000 R11: fffffbfff1c3ff7e R12: 0000000000000246 R13: ffffffff8182976f R14: ffff888030949dc0 R15: ffff8880b8f2b170 FS: 00007f064a4b46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007b8c1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000008d24 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ieee80211_rx_list+0x265c/0x2e60 net/mac80211/rx.c:5318 ieee80211_rx_napi+0x1ae/0x3d0 net/mac80211/rx.c:5338 ieee80211_rx include/net/mac80211.h:4849 [inline] ieee80211_handle_queued_frames+0x105/0x1b0 net/mac80211/main.c:317 tasklet_action_common+0x2fe/0x4d0 kernel/softirq.c:827 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6874 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 65 65 22 f7 e8 70 59 52 f7 fb bf 01 00 00 00 75 b9 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc900056f7840 EFLAGS: 00000286 RAX: 68368363eb015200 RBX: 0000000000000000 RCX: 68368363eb015200 RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: 0000000000000001 RBP: ffffc900056f78f0 R08: ffffffff8fa0f048 R09: ffffffff8fa0f058 R10: ffffffff8fa0f050 R11: ffffffff8fa0f043 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000adef08 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:unwind_next_frame+0x87/0x20b0 arch/x86/kernel/unwind_orc.c:-1 Code: 68 9a 00 4c 89 7c 24 58 4c 8b 6b 38 49 89 df 49 c1 ef 03 43 0f b6 04 37 84 c0 0f 85 a0 19 00 00 8b 03 85 c0 0f 84 79 18 00 00 <48> 89 6c 24 08 89 84 24 8c 00 00 00 4c 89 ac 24 98 00 00 00 4c 89 RSP: 0018:ffffc900056f79b0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc900056f7a88 RCX: 0000000080000000 RDX: dffffc0000000000 RSI: ffffffff88282722 RDI: ffffc900056f7a88 RBP: ffffc900056f7ad0 R08: ffffc900056f7b50 R09: 0000000000000003 R10: dffffc0000000000 R11: fffff52000adef5d R12: ffffffff88282722 R13: ffffc900056f7e10 R14: dffffc0000000000 R15: 1ffff92000adef51 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 ref_tracker_alloc+0x1a3/0x4b0 lib/ref_tracker.c:91 netns_tracker_alloc include/net/net_namespace.h:328 [inline] get_net_track include/net/net_namespace.h:344 [inline] sk_alloc+0x1ad/0x340 net/core/sock.c:2120 unix_create1+0xb3/0x710 net/unix/af_unix.c:-1 unix_create+0x143/0x1f0 net/unix/af_unix.c:1017 __sock_create+0x4a2/0x940 net/socket.c:1549 sock_create net/socket.c:1605 [inline] __sys_socketpair+0x232/0x540 net/socket.c:1736 __do_sys_socketpair net/socket.c:1785 [inline] __se_sys_socketpair net/socket.c:1782 [inline] __x64_sys_socketpair+0x97/0xb0 net/socket.c:1782 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: 0033:0x7f064959ce59 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:00007f064a4b4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f0649816090 RCX: 00007f064959ce59 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00007f0649632d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0649816128 R14: 00007f0649816090 R15: 00007ffc825bc758 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 32501 Comm: kworker/u4:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline] RIP: 0010:smp_call_function_many_cond+0xea2/0x1290 kernel/smp.c:998 Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 f6 f6 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 82 f3 0a 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 67 f3 0a RSP: 0018:ffffc9000486f800 EFLAGS: 00000293 RAX: ffffffff81779349 RBX: dffffc0000000000 RCX: ffff88806839d940 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000486f960 R08: ffffffff90afa247 R09: 1ffffffff215f448 R10: dffffc0000000000 R11: fffffbfff215f449 R12: 1ffff110171e81d9 R13: ffff8880b8e3bbc0 R14: 0000000000000001 R15: ffff8880b8f40ec8 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae22948060 CR3: 000000000c88e000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1574 [inline] text_poke_bp_batch+0x2b7/0x850 arch/x86/kernel/alternative.c:1774 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1972 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x11f/0x240 kernel/jump_label.c:207 static_key_enable+0x16/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xba/0x470 mm/kfence/core.c:821 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295