watchdog: BUG: soft lockup - CPU#0 stuck for 121s! [syz.2.622:8499] Modules linked in: irq event stamp: 14760131 hardirqs last enabled at (14760130): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (14760131): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (14705700): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (14705700): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (14705700): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (14705703): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (14705703): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (14705703): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 8499 Comm: syz.2.622 Not tainted 6.15.0-syzkaller-g99fe8af069a9 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:396 [inline] RIP: 0010:__rcu_read_unlock+0x27/0xe0 kernel/rcu/tree_plugin.h:435 Code: 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3c 25 08 c0 9c 92 48 8d 9f 44 04 00 00 <49> 89 dc 49 c1 ec 03 43 0f b6 04 3c 84 c0 75 4f ff 0b 75 1d 4c 8d RSP: 0000:ffffc900000075c8 EFLAGS: 00000286 RAX: 200d20e724c91300 RBX: ffff88802a868444 RCX: 200d20e724c91300 RDX: 0000000000000002 RSI: ffffffff8db69c35 RDI: ffff88802a868000 RBP: dffffc0000000000 R08: ffffc900000073af R09: 0000000000000000 R10: ffffc900000073a0 R11: ffffffffa0201994 R12: ffffc90003fbf288 R13: ffffc90003fb8000 R14: ffffc900000076c8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125c54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000602 Call Trace: rcu_read_unlock include/linux/rcupdate.h:873 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x19ae/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:2381 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4745 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1087 skb_release_all net/core/skbuff.c:1152 [inline] __kfree_skb net/core/skbuff.c:1166 [inline] consume_skb+0x9e/0xf0 net/core/skbuff.c:1398 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_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:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7108 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 4b ab 29 f6 e8 26 c3 60 f6 fb bf 01 00 00 00 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0000:ffffc90003fbf1c0 EFLAGS: 00000282 RAX: 200d20e724c91300 RBX: 0000000000000000 RCX: 200d20e724c91300 RDX: 0000000000000007 RSI: ffffffff8d97cf77 RDI: 0000000000000001 RBP: ffffc90003fbf270 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920007f7e38 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:__tlb_batch_free_encoded_pages mm/mmu_gather.c:114 [inline] RIP: 0010:tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] RIP: 0010:tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] RIP: 0010:tlb_flush_mmu+0x37c/0x680 mm/mmu_gather.c:404 Code: b8 00 02 00 00 44 0f 43 e8 41 8d 45 ff 49 8d 2c c4 48 89 e8 48 c1 e8 03 80 3c 18 00 74 08 48 89 ef e8 98 ae 14 00 48 8b 6d 00 <48> 89 ee 48 83 e6 02 31 ff e8 66 e5 b0 ff 48 83 e5 02 75 58 e8 7b RSP: 0000:ffffc90003fbf338 EFLAGS: 00000246 RAX: 1ffff1100b26d6cb RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88802a868000 RSI: 00000000000000ca RDI: 0000000000000000 RBP: ffffea0001777d80 R08: ffffea00004877f7 R09: 1ffffd4000090efe R10: dffffc0000000000 R11: fffff94000090eff R12: ffff88805936b010 R13: 00000000000000ca R14: ffff88805936b008 R15: 1ffff1100b26d601 zap_pte_range mm/memory.c:1774 [inline] zap_pmd_range mm/memory.c:1827 [inline] zap_pud_range mm/memory.c:1856 [inline] zap_p4d_range mm/memory.c:1877 [inline] unmap_page_range+0x38fd/0x41c0 mm/memory.c:1898 unmap_single_vma mm/memory.c:1941 [inline] unmap_vmas+0x399/0x580 mm/memory.c:1985 exit_mmap+0x248/0xb50 mm/mmap.c:1284 __mmput+0x118/0x420 kernel/fork.c:1121 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x640/0x22e0 kernel/exit.c:943 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: 0033:0x7fd5b198e929 Code: Unable to access opcode bytes at 0x7fd5b198e8ff. RSP: 002b:00007fd5b27ca038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000006 RBX: 00007fd5b1bb5fa0 RCX: 00007fd5b198e929 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100 RBP: 00007fd5b1a10b39 R08: 0000000000000009 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd5b1bb5fa0 R15: 00007ffda78a1558 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8226 Comm: kworker/u8:15 Not tainted 6.15.0-syzkaller-g99fe8af069a9 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xf69/0x12d0 kernel/smp.c:885 Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 e0 7d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 8b 79 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 70 79 0b RSP: 0018:ffffc900033076a0 EFLAGS: 00000293 RAX: ffffffff81b4e7e0 RBX: ffff8880b873cb40 RCX: ffff88802f190000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003307800 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: 1ffff110170c86b5 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b86435a8 FS: 0000000000000000(0000) GS:ffff888125d54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000041c40000 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: ffff8880b8927a20 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline] smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2870 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245