watchdog: BUG: soft lockup - CPU#0 stuck for 120s! [syz.0.860:8495] Modules linked in: irq event stamp: 13040615 hardirqs last enabled at (13040614): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (13040615): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (12949666): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (12949666): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (12949666): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (12949669): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (12949669): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (12949669): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 8495 Comm: syz.0.860 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2f/0x90 kernel/kcov.c:321 Code: 8b 04 24 65 48 8b 0c 25 08 40 75 92 65 8b 15 68 7c b5 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 3c 16 00 00 00 <74> 4e 8b 91 18 16 00 00 83 fa 03 75 43 48 8b 91 20 16 00 00 44 8b RSP: 0018:ffffc90000007508 EFLAGS: 00000246 RAX: ffffffff81ef52a2 RBX: 0000000000000102 RCX: ffff888030aa1e00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000007600 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff81ab297d R12: 1ffff92000000eb8 R13: dffffc0000000000 R14: ffff888030aa1e00 R15: dffffc0000000000 FS: 00007f1736a406c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002140 CR3: 0000000026dd6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: interrupt_context_level include/linux/preempt.h:95 [inline] get_recursion_context kernel/events/internal.h:215 [inline] perf_swevent_get_recursion_context+0x42/0x100 kernel/events/core.c:10474 perf_trace_buf_alloc+0x59/0x2a0 kernel/trace/trace_event_perf.c:410 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x18d/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:5877 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] is_module_text_address+0x18b/0x1e0 kernel/module/main.c:3745 kernel_text_address+0x94/0xe0 kernel/extable.c:119 __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 mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2398 [inline] slab_free mm/slub.c:4656 [inline] kmem_cache_free+0x192/0x3f0 mm/slub.c:4758 mac80211_hwsim_beacon_tx+0x3f6/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2317 __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:2347 __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+0x283/0x870 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_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:__schedule+0x0/0x4cd0 kernel/sched/core.c:6646 Code: cb f6 45 89 f8 89 d9 48 8b 5c 24 08 e9 ee fe ff ff 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 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc900033a7898 EFLAGS: 00000246 RAX: 1ffff1100615465c RBX: ffffffff8b56f5de RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d749f78 RDI: 0000000000000001 RBP: ffffc900033a7938 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: dffffc0000000000 R13: ffff88805e638000 R14: ffff888030aa32e0 R15: dffffc0000000000 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6947 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6971 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline] debug_check_no_obj_freed+0x451/0x470 lib/debugobjects.c:1129 free_pages_prepare mm/page_alloc.c:1269 [inline] __free_frozen_pages+0x403/0xcd0 mm/page_alloc.c:2725 __slab_free+0x326/0x400 mm/slub.c:4567 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_lru_noprof+0x1c6/0x3d0 mm/slub.c:4229 __d_alloc+0x31/0x6f0 fs/dcache.c:1681 d_alloc_pseudo+0x1f/0xb0 fs/dcache.c:1812 alloc_path_pseudo fs/file_table.c:360 [inline] alloc_file_pseudo+0xcc/0x210 fs/file_table.c:376 sock_alloc_file+0xb8/0x2e0 net/socket.c:470 sock_map_fd net/socket.c:500 [inline] __sys_socket+0x13d/0x1b0 net/socket.c:1692 __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+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1735b8e969 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:00007f1736a40038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f1735db5fa0 RCX: 00007f1735b8e969 RDX: 0000000000000084 RSI: 0000000000000005 RDI: 0000000000000002 RBP: 00007f1735c10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1735db5fa0 R15: 00007ffe53392728 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8497 Comm: syz.4.861 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2f/0x90 kernel/kcov.c:321 Code: 8b 04 24 65 48 8b 0c 25 08 40 75 92 65 8b 15 68 7c b5 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 3c 16 00 00 00 <74> 4e 8b 91 18 16 00 00 83 fa 03 75 43 48 8b 91 20 16 00 00 44 8b RSP: 0018:ffffc90000a07ea8 EFLAGS: 00000246 RAX: ffffffff81ef52cf RBX: 0000000000000100 RCX: ffff888027733c00 RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffffc90000a08001 R08: ffffc90000a0810f R09: 0000000000000000 R10: ffffc90000a08100 R11: ffffffffa0001d4c R12: 1ffff92000140f00 R13: dffffc0000000000 R14: ffff888027733c00 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f086ea33bd0 CR3: 0000000031de0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: interrupt_context_level include/linux/preempt.h:97 [inline] get_recursion_context kernel/events/internal.h:215 [inline] perf_swevent_get_recursion_context+0x6f/0x100 kernel/events/core.c:10474 perf_trace_buf_alloc+0x59/0x2a0 kernel/trace/trace_event_perf.c:410 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x18d/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:5877 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] trace_call_bpf+0x5a9/0x850 kernel/trace/bpf_trace.c:148 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10788 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:5877 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2398 [inline] slab_free mm/slub.c:4656 [inline] kmem_cache_free+0x192/0x3f0 mm/slub.c:4758 kfree_skb_reason include/linux/skbuff.h:1279 [inline] kfree_skb include/linux/skbuff.h:1288 [inline] ip6_mc_input+0x9c3/0xbe0 net/ipv6/ip6_input.c:591 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5887 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6000 process_backlog+0x60e/0x14f0 net/core/dev.c:6352 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 handle_softirqs+0x283/0x870 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:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_preemption_disabled+0x25/0x120 lib/smp_processor_id.c:16 Code: 90 90 90 90 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 05 4e 4e 1f 07 48 89 44 24 08 65 8b 05 56 4e 1f 07 65 8b 0d 4b 4e 1f 07 c1 ff ff ff 7f 74 23 65 48 8b 0d 2b 4e 1f 07 48 3b 4c 24 08 0f RSP: 0018:ffffc90003397088 EFLAGS: 00000286 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000003 RDX: 0000000000000000 RSI: ffffffff8b703300 RDI: ffffffff8bc1cde0 RBP: ffffc900033971b8 R08: 0000000000000001 R09: ffff8880b8932560 R10: 6f6c5f646165725f R11: 64656863735f6b63 R12: ffffe8ffffdaa000 R13: 1ffff92000672e24 R14: ffff8880b8932560 R15: ffffffff8de0ab40 trace_call_bpf+0x95/0x850 kernel/trace/bpf_trace.c:116 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10788 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:5877 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock_sched include/linux/rcupdate.h:953 [inline] pfn_valid+0x3c5/0x420 include/linux/mmzone.h:2127 page_table_check_clear+0x21/0x6e0 mm/page_table_check.c:70 ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline] get_and_clear_full_ptes include/linux/pgtable.h:714 [inline] zap_present_folio_ptes mm/memory.c:1501 [inline] zap_present_ptes mm/memory.c:1586 [inline] do_zap_pte_range mm/memory.c:1687 [inline] zap_pte_range mm/memory.c:1731 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0x30be/0x4210 mm/memory.c:1894 unmap_vmas+0x25d/0x3c0 mm/memory.c:1984 exit_mmap+0x245/0xba0 mm/mmap.c:1284 __mmput+0x118/0x420 kernel/fork.c:1379 exit_mm+0x1da/0x2c0 kernel/exit.c:589 do_exit+0x859/0x2550 kernel/exit.c:940 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x125e/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f61a858e969 Code: Unable to access opcode bytes at 0x7f61a858e93f. RSP: 002b:00007f61a9314038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: fffffffffffffff5 RBX: 00007f61a87b5fa0 RCX: 00007f61a858e969 RDX: 0000000000000090 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f61a8610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f61a87b5fa0 R15: 00007ffc85ae2b78