watchdog: BUG: soft lockup - CPU#0 stuck for 120s! [syz.3.954:8342] Modules linked in: irq event stamp: 18202553 hardirqs last enabled at (18202552): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (18202553): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (18160626): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (18160626): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (18160626): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (18160629): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (18160629): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (18160629): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 8342 Comm: syz.3.954 Not tainted 6.15.0-syzkaller-g64a064ce33b1 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x2f/0x70 kernel/kcov.c:217 Code: 8b 04 24 65 48 8b 0c 25 08 b0 9c 92 65 8b 15 48 54 dc 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 <74> 2c 8b 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b RSP: 0018:ffffc90000007200 EFLAGS: 00000246 RAX: ffffffff81f05035 RBX: 0000000000000001 RCX: ffff88801e3b1e00 RDX: 0000000000000100 RSI: 000000000000002c RDI: ffffe8ffffca7000 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff8880b8632a08 R10: dffffc0000000000 R11: fffff91ffff94e05 R12: ffffe8ffffca7000 R13: ffffffff8e00e1e0 R14: ffff8880b8632a08 R15: ffffffff8e00e248 FS: 0000000000000000(0000) GS:ffff888125c55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fefb62e56c0 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_run_bpf_submit+0xb5/0x170 kernel/events/core.c:10864 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5882 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680 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:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 skb_copy+0x188/0x800 net/core/skbuff.c:2125 mac80211_hwsim_tx_frame_no_nl+0xcd3/0x11c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1871 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2222 mac80211_hwsim_beacon_tx+0x3f0/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2323 __iterate_interfaces+0x2a8/0x590 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797 mac80211_hwsim_beacon+0xbb/0x1c0 drivers/net/wireless/virtual/mac80211_hwsim.c:2353 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 c2 d2 f4 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900041f7020 EFLAGS: 00000206 RAX: f659533cba5dd400 RBX: 1ffff9200083ee0c RCX: f659533cba5dd400 RDX: 0000000000000006 RSI: ffffffff8d97cb93 RDI: ffffffff8be28440 RBP: ffffc900041f7110 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: ffffffff8e144400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] is_bpf_text_address+0x292/0x2b0 kernel/bpf/core.c:774 kernel_text_address+0xa5/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3090 [inline] call_rcu+0x142/0x990 kernel/rcu/tree.c:3210 __dentry_kill+0x4d2/0x660 fs/dcache.c:688 dput+0x19f/0x2b0 fs/dcache.c:911 find_next_child+0x1e5/0x250 fs/libfs.c:603 simple_recursive_removal+0xf4/0x690 fs/libfs.c:619 debugfs_remove+0x5b/0x70 fs/debugfs/inode.c:805 hci_release_dev+0xa5/0x1570 net/bluetooth/hci_core.c:2708 bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:87 device_release+0x99/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22b/0x480 lib/kobject.c:737 vhci_release+0x88/0xd0 drivers/bluetooth/hci_vhci.c:666 __fput+0x449/0xa70 fs/file_table.c:465 task_work_run+0x1d1/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6ad/0x22e0 kernel/exit.c:955 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcf1478e929 Code: Unable to access opcode bytes at 0x7fcf1478e8ff. RSP: 002b:00007fcf155c3038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000008 RBX: 00007fcf149b5fa0 RCX: 00007fcf1478e929 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000500 RBP: 00007fcf14810b39 R08: 0000000000000009 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fcf149b5fa0 R15: 00007fff90559418 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8542 Comm: syz.9.979 Not tainted 6.15.0-syzkaller-g64a064ce33b1 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x35/0xb0 kernel/rcu/tree.c:745 Code: 05 e0 89 f5 10 e8 8b 9b be 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 60 1c ba 8d 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 bc a7 7c 00 48 c7 c3 58 df 9d 92 RSP: 0018:ffffc90000a07fa0 EFLAGS: 00000806 RAX: 1ffffffff1b7438d RBX: 0000000000000001 RCX: a7c5fd3db0f1f800 RDX: 0000000000010100 RSI: ffffffff8be28420 RDI: ffffffff8be283e0 RBP: ffffffff81aec01e R08: ffffc90000a07c57 R09: 0000000000000000 R10: ffffc90000a07c48 R11: fffff52000140f8b R12: 0000000000000002 R13: ffffffff99ac4388 R14: ffffffff8dba1c68 R15: dffffc0000000000 FS: 00007fefb64126c0(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6d9f946a10 CR3: 0000000026d46000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5834 seqcount_lockdep_reader_access+0xc9/0x1c0 include/linux/seqlock.h:72 ktime_get+0x3e/0x1f0 kernel/time/timekeeping.c:776 clockevents_program_event+0xea/0x360 kernel/time/clockevents.c:326 hrtimer_interrupt+0x620/0xaa0 kernel/time/hrtimer.c:1900 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline] RIP: 0010:__local_bh_enable_ip+0x135/0x1c0 kernel/softirq.c:414 Code: 8b e8 bf 1e e0 09 65 66 8b 05 af 0b 17 11 66 85 c0 75 5a bf 01 00 00 00 e8 a8 32 0b 00 e8 53 43 42 00 fb 65 8b 05 8b 0b 17 11 <85> c0 75 05 e8 c2 f1 ad ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00 RSP: 0018:ffffc90000a083a0 EFLAGS: 00000286 RAX: 0000000000000101 RBX: 0000000000000200 RCX: a7c5fd3db0f1f800 RDX: 0000000000000002 RSI: ffffffff8d97cb93 RDI: ffffffff8be28440 RBP: ffffc90000a08430 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: ffffffff894d1d0e R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000141074 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline] __dev_queue_xmit+0x1cd7/0x3a70 net/core/dev.c:4740 neigh_output include/net/neighbour.h:539 [inline] ip6_finish_output2+0x11fe/0x16a0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226 NF_HOOK include/linux/netfilter.h:317 [inline] ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4041 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:debug_object_activate+0x52/0x420 lib/debugobjects.c:811 Code: 24 18 31 ed ba 10 00 00 00 31 f6 e8 28 73 5c fd 48 c7 44 24 28 05 00 00 00 48 89 5c 24 30 4c 89 74 24 38 80 3d 36 d5 d9 0a 00 <0f> 85 8c 02 00 00 66 90 8b 05 f8 81 c5 09 3b 05 f6 81 c5 09 0f 82 RSP: 0018:ffffc90004817120 EFLAGS: 00000246 RAX: ffffc90004817138 RBX: ffffc90003370000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90004817148 RBP: 0000000000000000 R08: ffffc90004817147 R09: 0000000000000000 R10: ffffc90004817138 R11: fffff52000902e29 R12: dffffc0000000000 R13: 1ffff92000902e40 R14: ffffffff8b8bd660 R15: ffffc90003370000 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline] __call_rcu_common kernel/rcu/tree.c:3075 [inline] call_rcu+0x95/0x990 kernel/rcu/tree.c:3210 thread_stack_delayed_free kernel/fork.c:238 [inline] free_thread_stack kernel/fork.c:342 [inline] release_task_stack kernel/fork.c:474 [inline] put_task_stack+0x180/0x210 kernel/fork.c:481 finish_task_switch+0x454/0x950 kernel/sched/core.c:5297 context_switch kernel/sched/core.c:5399 [inline] __schedule+0x16fd/0x4d00 kernel/sched/core.c:6785 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:unwind_next_frame+0x17db/0x2390 arch/x86/kernel/unwind_orc.c:664 Code: 49 0f bf 04 24 48 01 c6 4c 89 f7 48 89 da e8 4c 0e 00 00 84 c0 0f 84 47 01 00 00 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 20 <0f> b6 04 28 84 c0 0f 85 f4 08 00 00 b3 01 8b 84 24 84 00 00 00 41 RSP: 0018:ffffc900048176f8 EFLAGS: 00000202 RAX: 1ffff92000902f05 RBX: ffffffff903013cc RCX: 0000000000000001 RDX: ffffc90004817868 RSI: dffffc0000000000 RDI: ffffc90004817818 RBP: dffffc0000000000 R08: ffffc90004817818 R09: 0000000000000000 R10: ffffc90004817878 R11: fffff52000902f11 R12: ffffc90004817818 R13: ffffc90004817878 R14: ffffc90004817828 R15: 1ffffffff2060279 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] ref_tracker_alloc+0x133/0x460 lib/ref_tracker.c:203 __netns_tracker_alloc include/net/net_namespace.h:357 [inline] netns_tracker_alloc include/net/net_namespace.h:366 [inline] get_net_track include/net/net_namespace.h:383 [inline] sk_alloc+0x1b1/0x370 net/core/sock.c:2315 kcm_create+0x100/0x580 net/kcm/kcmsock.c:1801 __sock_create+0x4b3/0x9f0 net/socket.c:1541 sock_create net/socket.c:1599 [inline] __sys_socket_create net/socket.c:1636 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1683 __do_sys_socket net/socket.c:1697 [inline] __se_sys_socket net/socket.c:1695 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1695 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fefb558e929 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:00007fefb6412038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fefb57b5fa0 RCX: 00007fefb558e929 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000029 RBP: 00007fefb5610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fefb57b5fa0 R15: 00007ffc995ec588