watchdog: BUG: soft lockup - CPU#0 stuck for 119s! [syz.0.2675:18439] Modules linked in: irq event stamp: 14213279 hardirqs last enabled at (14213278): [] rcu_read_unlock_special+0x2ec/0x480 kernel/rcu/tree_plugin.h:769 hardirqs last disabled at (14213279): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13908508): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13908508): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13908508): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (13908511): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13908511): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13908511): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 18439 Comm: syz.0.2675 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:rcu_read_unlock_special+0x1d/0x480 kernel/rcu/tree_plugin.h:773 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 8b 2d 7b f7 6d 11 f7 c5 00 00 f0 00 74 14 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 90 fe f8 09 cc 49 89 RSP: 0018:ffffc900000078a0 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000101 RDX: 0000000000000003 RSI: ffffffff8deec7f5 RDI: ffffffff8c278880 RBP: ffff888125496000 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffffffff8e765f78 R13: dffffc0000000000 R14: ffff8880b863bb98 R15: 1ffff110170c7773 FS: 00007fcd8f11c6c0(0000) GS:ffff888125496000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5b51f456b8 CR3: 0000000033c94000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:883 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaf/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2670 [inline] slab_free_after_rcu_debug+0x126/0x220 mm/slub.c:6147 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:check_kcov_mode kernel/kcov.c:194 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x36/0x90 kernel/kcov.c:321 Code: f8 e7 53 11 65 8b 15 19 e8 53 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 54 16 00 00 00 74 4e 8b 91 30 16 00 00 <83> fa 03 75 43 48 8b 91 38 16 00 00 44 8b 89 34 16 00 00 49 c1 e1 RSP: 0018:ffffc9000ef673f8 EFLAGS: 00000246 RAX: ffffffff8177b0c1 RBX: ffff88809c2d6000 RCX: ffff888025c55ac0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffea00016ed008 R08: ffffffff8e5c66c3 R09: 1ffffffff1cb8cd8 R10: dffffc0000000000 R11: fffffbfff1cb8cd9 R12: ffffea00016ed010 R13: dffffc0000000000 R14: ffffea0000000000 R15: 000000009c2d6000 __pgd_free include/asm-generic/pgalloc.h:302 [inline] _pgd_free arch/x86/mm/pgtable.c:319 [inline] pgd_free+0x1a1/0x1e0 arch/x86/mm/pgtable.c:381 mm_free_pgd kernel/fork.c:585 [inline] __mmdrop+0xb5/0x750 kernel/fork.c:727 mmdrop include/linux/sched/mm.h:55 [inline] mmdrop_sched include/linux/sched/mm.h:83 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline] finish_task_switch+0x449/0x920 kernel/sched/core.c:5177 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x1584/0x52b0 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:121 [inline] RIP: 0010:lock_is_held_type+0x27/0x150 kernel/locking/lockdep.c:5933 Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 bb ff ff ff ff 83 3d 36 8c 70 04 00 0f 84 e4 00 00 00 65 8b 05 c9 20 78 07 <85> c0 0f 85 d5 00 00 00 65 4c 8b 2d 11 db 77 07 41 83 bd 14 0b 00 RSP: 0018:ffffc9000ef67808 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffff888025c55ac0 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888032f19bc0 RBP: 0000000000000001 R08: ffff888025c55ac0 R09: 0000000000000004 R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888032cf1600 R14: 0000000000000000 R15: ffffffffffffffff lock_is_held include/linux/lockdep.h:249 [inline] mt_locked lib/maple_tree.c:-1 [inline] mt_slot lib/maple_tree.c:736 [inline] mas_next_slot+0x97a/0xcf0 lib/maple_tree.c:4406 mas_find+0xb0e/0xd30 lib/maple_tree.c:5622 vma_next include/linux/mm.h:1122 [inline] acct_collect+0x20d/0x7c0 kernel/acct.c:569 do_exit+0x5a1/0x2310 kernel/exit.c:935 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112 get_signal+0x1284/0x1330 kernel/signal.c:3034 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcd8e19bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd8f11c028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000006 RBX: 00007fcd8e415fa0 RCX: 00007fcd8e19bf79 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000012c0 RBP: 00007fcd8e2327e0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd8e416038 R14: 00007fcd8e415fa0 R15: 00007ffdc8737718 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 18357 Comm: syz.2.2657 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline] RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline] RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline] RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:208 Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc 89 f6 31 d2 e9 96 0e 6f 03 66 0f 1f 44 00 RSP: 0018:ffffc90000a07fb0 EFLAGS: 00000046 RAX: 000000000000013b RBX: ffff8880b8723e40 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 000000000000013b RDI: 0000000000000838 RBP: 0000000000000000 R08: ffffffff81b1f485 R09: ffffffff9a284508 R10: 0000000000000003 R11: ffffffff81735570 R12: 0000000010000a10 R13: dffffc0000000000 R14: 000000000000013b R15: 0000000000000020 FS: 00007ffbb71b96c0(0000) GS:ffff888125596000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e87b59040 CR3: 000000009229a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_write arch/x86/include/asm/apic.h:405 [inline] lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:418 clockevents_program_event+0x1c9/0x350 kernel/time/clockevents.c:334 hrtimer_interrupt+0xb08/0x1010 kernel/time/hrtimer.c:1924 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 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:arch_stack_walk+0x122/0x150 arch/x86/kernel/stacktrace.c:24 Code: 58 09 00 48 85 c0 74 24 48 89 df 48 89 c6 4d 89 f3 2e e8 c9 8e 93 1e 84 c0 74 11 4c 89 ff e8 c5 59 09 00 83 bd 78 ff ff ff 00 <75> cf 65 48 8b 05 e4 f7 ab 11 48 3b 45 d8 75 12 48 83 c4 68 5b 41 RSP: 0018:ffffc90000a08228 EFLAGS: 00000202 RAX: 0000000090b23301 RBX: ffffc90000a082e0 RCX: 0000000000000101 RDX: 0000000000000006 RSI: ffffffff8e15b390 RDI: ffff888027919e40 RBP: ffffc90000a082b0 R08: ffffc90000a08a30 R09: 0000000000000000 R10: ffffc90000a08278 R11: fffff52000141051 R12: ffff888027919e40 R13: 1ffff11004f2347e R14: ffffffff81aff200 R15: ffffc90000a08228 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1888 prep_new_page mm/page_alloc.c:1896 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3961 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5249 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2485 alloc_slab_page mm/slub.c:3236 [inline] allocate_slab+0x83/0x660 mm/slub.c:3411 new_slab mm/slub.c:3469 [inline] ___slab_alloc+0x150/0x6a0 mm/slub.c:4334 __slab_alloc_node mm/slub.c:4400 [inline] slab_alloc_node mm/slub.c:4776 [inline] kmem_cache_alloc_node_noprof+0x1f6/0x690 mm/slub.c:4840 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 __netdev_alloc_skb+0xc1/0x810 net/core/skbuff.c:775 netdev_alloc_skb include/linux/skbuff.h:3485 [inline] dev_alloc_skb include/linux/skbuff.h:3498 [inline] __ieee80211_beacon_get+0xc06/0x1880 net/mac80211/tx.c:5658 ieee80211_beacon_get_tim+0xbd/0x2c0 net/mac80211/tx.c:5780 ieee80211_beacon_get include/net/mac80211.h:5720 [inline] mac80211_hwsim_beacon_tx+0x3c5/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2361 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:760 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:796 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x529/0xc30 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:schedule_debug kernel/sched/core.c:5854 [inline] RIP: 0010:__schedule+0x184/0x52b0 kernel/sched/core.c:6783 Code: 74 08 48 89 df e8 0c 8d 8c f6 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 f3 8c 8c f6 48 81 3b 9d 6e ac 57 <0f> 85 89 1a 00 00 45 85 ed 7f 4c 48 8b 44 24 10 48 8d 58 18 48 89 RSP: 0018:ffffc9000e5fedc0 EFLAGS: 00000246 RAX: 1ffff92001cbf000 RBX: ffffc9000e5f8000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8c278860 RDI: ffffffff8c278820 RBP: ffffc9000e5fefb0 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffff888125596000 R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff110170e7573 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__free_pages_prepare mm/page_alloc.c:-1 [inline] RIP: 0010:__free_frozen_pages+0x7ff/0xd90 mm/page_alloc.c:2977 Code: ff c8 49 8d 54 24 40 31 db 48 89 d6 80 7c 24 04 00 48 89 44 24 38 48 89 54 24 10 48 89 74 24 30 75 0f 4c 89 e7 e8 01 b9 ff ff <48> 8b 54 24 10 01 c3 eb 4f 48 89 d0 48 c1 e8 03 48 b9 00 00 00 00 RSP: 0018:ffffc9000e5ff0e8 EFLAGS: 00000292 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffffea0001aa7c80 RSI: ffffea0001aa7c80 RDI: ffffea0001aa7c98 RBP: ffffea0001aa7c00 R08: ffffea0001aa7c77 R09: 1ffffd4000354f8e R10: dffffc0000000000 R11: fffff94000354f8f R12: ffffea0001aa7c00 R13: ffffea0001aa7c08 R14: 1ffffd4000354f81 R15: 0000000000000000 __slab_free+0x263/0x2b0 mm/slub.c:5490 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:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4459 [inline] slab_alloc_node mm/slub.c:4788 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4795 ptlock_alloc+0x20/0x70 mm/memory.c:7449 ptlock_init include/linux/mm.h:3284 [inline] pagetable_pte_ctor include/linux/mm.h:3338 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:79 [inline] pte_alloc_one+0x7a/0x370 arch/x86/mm/pgtable.c:18 __pte_alloc+0x25/0x430 mm/memory.c:453 copy_pte_range mm/memory.c:1237 [inline] copy_pmd_range+0x77d2/0x8050 mm/memory.c:1392 copy_pud_range mm/memory.c:1429 [inline] copy_p4d_range mm/memory.c:1453 [inline] copy_page_range+0xbe8/0x11f0 mm/memory.c:1539 dup_mmap+0xf2b/0x1b80 mm/mmap.c:1827 dup_mm kernel/fork.c:1530 [inline] copy_mm+0x13b/0x4b0 kernel/fork.c:1582 copy_process+0x18b6/0x3cf0 kernel/fork.c:2223 kernel_clone+0x248/0x870 kernel/fork.c:2654 __do_sys_clone kernel/fork.c:2795 [inline] __se_sys_clone kernel/fork.c:2779 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2779 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffbb639bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffbb71b8fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffbb6615fa0 RCX: 00007ffbb639bf79 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffbb64327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffbb6616038 R14: 00007ffbb6615fa0 R15: 00007ffe4ab40528