watchdog: BUG: soft lockup - CPU#1 stuck for 142s! [syz.0.2118:13909] Modules linked in: irq event stamp: 14058865 hardirqs last enabled at (14058864): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (14058865): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13408422): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13408422): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13408422): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (13408425): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13408425): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13408425): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 13909 Comm: syz.0.2118 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lock_release+0x2a6/0x3b0 kernel/locking/lockdep.c:5893 Code: 4d 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 52 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 da 16 e0 10 <48> 3b 44 24 28 75 75 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 RSP: 0018:ffffc90000a082d0 EFLAGS: 00000206 RAX: 10950da9b9f10b00 RBX: 0000000000000202 RCX: 10950da9b9f10b00 RDX: 0000000000000008 RSI: ffffffff8d979ceb RDI: ffffffff8bc086e0 RBP: ffff88802a49e7f0 R08: ffffc90000a08ba8 R09: 0000000000000000 R10: ffffc90000a08458 R11: fffff5200014108d R12: 0000000000000008 R13: 0000000000000008 R14: ffffffff8df41a20 R15: ffff88802a49db80 FS: 00007f638a38d6c0(0000) GS:ffff888125f34000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000075188000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6779 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] ip6_mc_input+0x8de/0xb70 net/ipv6/ip6_input.c:593 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6137 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6250 process_backlog+0x622/0x1500 net/core/dev.c:6602 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7881 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 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:in_lock_functions+0x0/0x30 kernel/locking/spinlock.c:408 Code: c7 58 78 86 95 e8 c0 49 89 00 e9 61 ff ff ff cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 81 ff 60 9a 5e 8b 0f 93 c0 48 81 ff 4c df 5e 8b 0f RSP: 0018:ffffc9000e107698 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffffff8b5d327e RCX: 0000000000080000 RDX: ffffc9000523b000 RSI: 00000000000041f7 RDI: ffffffff8b5d327e RBP: ffffc9000e107748 R08: ffffffff8f822377 R09: 1ffffffff1f0446e R10: dffffc0000000000 R11: fffffbfff1f0446f R12: 0000000000000000 R13: ffffffff9283bd40 R14: dffffc0000000000 R15: dffffc0000000000 get_lock_parent_ip include/linux/ftrace.h:1132 [inline] preempt_latency_start kernel/sched/core.c:5705 [inline] preempt_schedule_common+0x43/0xd0 kernel/sched/core.c:7046 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 on_each_cpu_cond_mask+0x7a/0x80 kernel/smp.c:1044 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921 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 tracepoint_add_func+0x994/0xa10 kernel/tracepoint.c:315 tracepoint_probe_register_prio kernel/tracepoint.c:464 [inline] tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:484 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:10941 perf_try_init_event+0x17f/0x870 kernel/events/core.c:12684 perf_init_event kernel/events/core.c:12782 [inline] perf_event_alloc+0x1430/0x2d50 kernel/events/core.c:13057 __do_sys_perf_event_open kernel/events/core.c:13575 [inline] __se_sys_perf_event_open+0x756/0x1d90 kernel/events/core.c:13456 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f638958f749 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:00007f638a38d038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f63897e5fa0 RCX: 00007f638958f749 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007f6389613f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f63897e6038 R14: 00007f63897e5fa0 R15: 00007fff7a0a5c58 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13912 Comm: syz.9.2119 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__lock_release kernel/locking/lockdep.c:5521 [inline] RIP: 0010:lock_release+0xcf/0x3b0 kernel/locking/lockdep.c:5889 Code: 20 fa 48 c7 c7 23 79 7a 8d e8 2d 78 bd 09 65 ff 05 56 5e e0 10 c7 44 24 20 01 00 00 00 83 3d 37 ac e3 0d 00 0f 84 90 01 00 00 <41> 8b 87 28 0b 00 00 85 c0 0f 84 17 01 00 00 4c 89 6c 24 18 48 89 RSP: 0018:ffffc900000063d8 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000002 RCX: d4049205af0b4f00 RDX: ffffffff81af6895 RSI: ffffffff8d7a7923 RDI: ffffffff8bc086e0 RBP: ffffc900000064f8 R08: ffffffff81af6895 R09: ffffffff998e4508 R10: 000000000000000b R11: 0000000000010100 R12: dffffc0000000000 R13: ffffffff81af6895 R14: ffffffff998e4508 R15: ffff88802a7edb80 FS: 00007f234f8296c0(0000) GS:ffff888125e34000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe669d98ff8 CR3: 000000007dc4e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: seqcount_lockdep_reader_access+0xde/0x1c0 include/linux/seqlock.h:73 ktime_get+0x45/0x200 kernel/time/timekeeping.c:824 hrtimer_forward_now include/linux/hrtimer.h:362 [inline] perf_swevent_hrtimer+0x45f/0x570 kernel/events/core.c:11861 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x4d0/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 f4 48 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000006af8 EFLAGS: 00000206 RAX: d4049205af0b4f00 RBX: 0000000000000000 RCX: d4049205af0b4f00 RDX: 00000000e1256e95 RSI: ffffffff8d979ceb RDI: ffffffff8bc086e0 RBP: ffffffff81743f85 R08: ffffffff81743f85 R09: ffffffff8df41a20 R10: ffffc90000006cb8 R11: ffffffff81ada100 R12: 0000000000000002 R13: ffffffff8df41a20 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kfree+0x1c0/0x660 mm/slub.c:6876 ieee80211_inform_bss+0xc4e/0x1130 net/mac80211/scan.c:164 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd14/0x1ad0 net/wireless/scan.c:2373 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:230 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359 __ieee80211_rx_handle_packet net/mac80211/rx.c:5282 [inline] ieee80211_rx_list+0x2485/0x2f90 net/mac80211/rx.c:5539 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5562 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x358/0x550 kernel/softirq.c:925 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 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:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945 Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 49 ba 22 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc9000e207158 EFLAGS: 00000206 RAX: d4049205af0b4f00 RBX: 0000000000000000 RCX: d4049205af0b4f00 RDX: 0000000000000000 RSI: ffffffff8d979ceb RDI: ffffffff8bc086e0 RBP: 00000000ffffffff R08: ffffffff8f822377 R09: 1ffffffff1f0446e R10: dffffc0000000000 R11: fffffbfff1f0446f R12: 0000000000000246 R13: ffff88802a7edb80 R14: ffffffff8df41ae0 R15: 0000000000000004 lock_is_held include/linux/lockdep.h:249 [inline] schedule_debug kernel/sched/core.c:5835 [inline] __schedule+0x278/0x5000 kernel/sched/core.c:6740 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_release+0x33b/0x3b0 kernel/locking/lockdep.c:-1 Code: 48 8d 3d d8 c1 e6 0d 67 48 0f b9 3a e9 1f fe ff ff e8 19 57 bd 09 48 c7 c7 f0 1b e1 8d 4c 89 ee e8 ea b4 29 03 e9 c8 fd ff ff 0f 1e fa 4d 89 f7 4c 89 eb 65 8b 05 48 16 e0 10 83 f8 08 73 55 RSP: 0018:ffffc9000e207570 EFLAGS: 00000282 RAX: d4049205af0b4f00 RBX: ffffc9000e207601 RCX: d4049205af0b4f00 RDX: ffffffff9022d701 RSI: ffffffff81743f85 RDI: ffffffff8df41a20 RBP: dffffc0000000000 R08: ffffc9000e207707 R09: 0000000000000000 R10: ffffc9000e2076f8 R11: fffff52001c40ee1 R12: ffffc9000e207a38 R13: ffffffff81743f85 R14: ffffffff8df41a20 R15: ffffffff81743f85 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kfree+0x1c0/0x660 mm/slub.c:6876 free_slab_obj_exts mm/slub.c:2203 [inline] unaccount_slab mm/slub.c:3216 [inline] __free_slab+0xaf/0x180 mm/slub.c:3316 __slab_free+0x21b/0x2a0 mm/slub.c:6004 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270 alloc_vfsmnt+0x23/0x430 fs/namespace.c:293 clone_mnt+0x4b/0x9a0 fs/namespace.c:1252 do_loopback+0x31d/0x410 fs/namespace.c:2994 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f234e98f749 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:00007f234f829038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f234ebe5fa0 RCX: 00007f234e98f749 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000200000000000 RBP: 00007f234ea13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000989046 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f234ebe6038 R14: 00007f234ebe5fa0 R15: 00007fffea594f18