watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.4:37896] Modules linked in: irq event stamp: 95975 hardirqs last enabled at (95974): [] irqentry_exit+0x3b/0x90 hardirqs last disabled at (95975): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (94522): [] handle_softirqs+0x50c/0x770 softirqs last disabled at (94573): [] __irq_exit_rcu+0xc4/0x100 CPU: 1 UID: 0 PID: 37896 Comm: syz-executor.4 Tainted: G W 6.17.0-rc3-next-20250826 #1 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:perf_trace_buf_alloc+0x74/0x1a0 Code: 00 fc ff df 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 0b 01 00 00 41 89 1c 24 31 ff 89 de e8 8c cc f5 ff <85> db 0f 88 e0 00 00 00 e8 4f d1 f5 ff 4d 85 ed 74 3c e8 45 d1 f5 RSP: 0018:ffff88806cf07ec8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffffffffffff RCX: ffffffff817de804 RDX: ffff888015a83700 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000000002c R08: ffffffff84c917c0 R09: ffff88806cf08188 R10: 00000000ffffffff R11: 000000000000df0b R12: ffff88806cf07f50 R13: ffff88806cf07f60 R14: ffff88806cf07fa0 R15: ffffe8ffffd106f8 FS: 00007f7a73c58700(0000) GS:ffff8880e56e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056068b2aa158 CR3: 00000000165cc000 CR4: 0000000000350ef0 Call Trace: perf_trace_lock+0x163/0x5d0 lock_release+0x1ab/0x290 unwind_next_frame+0x3b7/0x2540 __unwind_start+0x517/0x7c0 perf_callchain_kernel+0x28b/0x620 get_perf_callchain+0x179/0x6c0 perf_callchain+0x1a6/0x240 perf_prepare_sample+0xd15/0x21f0 perf_event_output_forward+0xd2/0x2c0 __perf_event_overflow+0x2c5/0xc50 perf_swevent_event+0x2c6/0x3f0 perf_tp_event+0x497/0xe70 perf_trace_run_bpf_submit+0xef/0x180 perf_trace_lock+0x337/0x5d0 lock_release+0x1ab/0x290 unwind_next_frame+0x3b7/0x2540 arch_stack_walk+0x86/0xf0 stack_trace_save+0x8e/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x3f/0x50 kmem_cache_free+0x2a1/0x460 rcu_core+0x7c8/0x1800 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:strlen+0x58/0xa0 Code: 75 50 80 7d 00 00 74 3d 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a <38> ca 7f 04 84 d2 75 27 80 38 00 75 de 48 83 c4 08 48 29 e8 5b 5d RSP: 0018:ffff888049726a90 EFLAGS: 00000206 RAX: ffffffff84c917cd RBX: dffffc0000000000 RCX: 0000000000000005 RDX: 0000000000000006 RSI: ffffffff85c1c420 RDI: ffffffff84c917c0 RBP: ffffffff84c917c0 R08: 0000000000000001 R09: ffff888049726d48 R10: 000000000003bda3 R11: 000000000001ca86 R12: ffffffff85b23260 R13: ffffffff85c1c438 R14: ffff888049726b60 R15: ffff888049726d08 perf_trace_lock+0xb5/0x5d0 lock_release+0x1ab/0x290 unwind_next_frame+0x3b7/0x2540 __unwind_start+0x517/0x7c0 perf_callchain_kernel+0x28b/0x620 get_perf_callchain+0x179/0x6c0 perf_callchain+0x1a6/0x240 perf_prepare_sample+0xd15/0x21f0 perf_event_output_forward+0xd2/0x2c0 __perf_event_overflow+0x2c5/0xc50 perf_swevent_event+0x2c6/0x3f0 perf_tp_event+0x497/0xe70 perf_trace_run_bpf_submit+0xef/0x180 perf_trace_lock+0x337/0x5d0 lock_release+0x1ab/0x290 is_module_text_address+0x67/0x100 kernel_text_address+0x35/0xc0 __kernel_text_address+0xd/0x40 unwind_get_return_address+0x59/0xa0 arch_stack_walk+0x9c/0xf0 stack_trace_save+0x8e/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x3f/0x50 kfree+0x281/0x470 __free_slab+0xf5/0x130 qlist_free_all+0x50/0x160 kasan_quarantine_reduce+0x19f/0x240 __kasan_slab_alloc+0x49/0x70 kmem_cache_alloc_noprof+0x13c/0x3d0 dup_fd+0x4d/0xa80 copy_process+0x2112/0x73c0 kernel_clone+0xea/0x7f0 __do_sys_fork+0x94/0xd0 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7a766e2b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7a73c58188 EFLAGS: 00000246 ORIG_RAX: 0000000000000039 RAX: ffffffffffffffda RBX: 00007f7a767f5f60 RCX: 00007f7a766e2b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f7a7673cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff019b43ff R14: 00007f7a73c58300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.17.0-rc3-next-20250826 #1 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:unwind_next_frame+0x2e6/0x2540 Code: c2 01 49 81 f8 02 73 c9 86 0f 83 67 08 00 00 89 d7 48 8d 3c 7f 48 8d bc 3f 5c 8b 7b 86 48 81 ff 02 73 c9 86 0f 87 4c 08 00 00 <44> 29 da 48 8d 3c 85 98 9b 47 86 4c 89 c6 e8 57 f3 ff ff 48 89 c1 RSP: 0018:ffff88806ce08508 EFLAGS: 00000283 RAX: 000000000000cd31 RBX: 0000000000000001 RCX: ffffffff814c52b3 RDX: 000000000000cd3a RSI: 0000000000004c52 RDI: ffffffff86805ab8 RBP: ffff88806ce085d0 R08: ffffffff86805a82 R09: 0000000000000000 R10: 000000000003bda3 R11: 000000000000cd31 R12: ffff88806ce085d8 R13: ffff88806ce085c0 R14: ffff88806ce085b9 R15: ffff88806ce08578 FS: 0000000000000000(0000) GS:ffff8880e55e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056068b237618 CR3: 0000000009d44000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x86/0xf0 stack_trace_save+0x8e/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_noprof+0x13c/0x3d0 __alloc_object+0x2b/0x2c0 __create_object+0x1d/0x80 kmem_cache_alloc_node_noprof+0x30f/0x3e0 __alloc_skb+0x2ab/0x370 skb_copy+0x1d5/0x3b0 mac80211_hwsim_tx_frame_no_nl.isra.0+0xafa/0x1320 mac80211_hwsim_tx_frame+0x1ee/0x2a0 mac80211_hwsim_beacon_tx+0x53c/0x940 __iterate_interfaces+0x2e0/0x650 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 mac80211_hwsim_beacon+0x105/0x200 __hrtimer_run_queues+0x1ee/0xac0 hrtimer_run_softirq+0x14c/0x310 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:pv_native_safe_halt+0x1e/0x30 Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 eb 0c 0f 1f 44 00 00 0f 00 2d 09 a6 0a 00 0f 1f 44 00 00 fb f4 dd 83 02 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 RSP: 0018:ffffffff85a07e00 EFLAGS: 00000202 RAX: 00000000005e05e9 RBX: 0000000000000000 RCX: ffffffff84bae5f7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff814c52b4 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffed100d9c630a R10: ffff88806ce31853 R11: 0000000000000001 R12: ffffffff8643a450 R13: 1ffffffff0b40fc7 R14: 0000000000000000 R15: 0000000000000000 default_idle+0xe/0x20 default_idle_call+0x6d/0xb0 do_idle+0x344/0x490 cpu_startup_entry+0x4f/0x60 rest_init+0x164/0x290 start_kernel+0x3f9/0x510 x86_64_start_reservations+0x18/0x30 x86_64_start_kernel+0x109/0x120 common_startup_64+0x13e/0x148 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 0f fisttps (%rdi) 2: b6 14 mov $0x14,%dh 4: 02 4c 89 e0 add -0x20(%rcx,%rcx,4),%cl 8: 83 e0 07 and $0x7,%eax b: 83 c0 03 add $0x3,%eax e: 38 d0 cmp %dl,%al 10: 7c 08 jl 0x1a 12: 84 d2 test %dl,%dl 14: 0f 85 0b 01 00 00 jne 0x125 1a: 41 89 1c 24 mov %ebx,(%r12) 1e: 31 ff xor %edi,%edi 20: 89 de mov %ebx,%esi 22: e8 8c cc f5 ff callq 0xfff5ccb3 * 27: 85 db test %ebx,%ebx <-- trapping instruction 29: 0f 88 e0 00 00 00 js 0x10f 2f: e8 4f d1 f5 ff callq 0xfff5d183 34: 4d 85 ed test %r13,%r13 37: 74 3c je 0x75 39: e8 .byte 0xe8 3a: 45 d1 f5 rex.RB shl %r13d