watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.8.2582:19578] Modules linked in: irq event stamp: 16337693 hardirqs last enabled at (16337692): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (16337693): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (16309736): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (16309736): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (16309736): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (16309739): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (16309739): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (16309739): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 19578 Comm: syz.8.2582 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194 Code: f7 e8 7d 70 f2 f5 f7 c3 00 02 00 00 74 05 e8 00 c1 1d f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 36 e4 f5 65 8b 05 8d ef 6b 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90000007868 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000000000102 RDX: 0000000000000003 RSI: ffffffff8def18d2 RDI: 0000000000000001 RBP: ffffc90000007920 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: ffff888055733a80 R13: ffffea000155cc10 R14: ffff88801d2c5cc0 R15: 0000000000000202 FS: 00007ff9050656c0(0000) GS:ffff888125466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055de314ba4b0 CR3: 0000000033be4000 CR4: 00000000003526f0 DR0: 00000000000000d4 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:407 [inline] get_from_partial_node+0x47a/0x500 mm/slub.c:3812 get_from_partial mm/slub.c:3901 [inline] ___slab_alloc+0xae/0x6b0 mm/slub.c:4372 __slab_alloc_node mm/slub.c:4442 [inline] slab_alloc_node mm/slub.c:4818 [inline] kmem_cache_alloc_node_noprof+0x1f6/0x690 mm/slub.c:4882 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+0x53a/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866 handle_softirqs+0x22a/0x870 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+0x17c/0x5340 kernel/sched/core.c:6783 Code: 10 48 8d 58 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 b3 c8 81 f6 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 9a c8 81 f6 48 81 3b 9d 6e ac 57 0f 85 89 1a 00 RSP: 0018:ffffc9000d4eea00 EFLAGS: 00000246 RAX: 1ffff92001a9d000 RBX: ffffc9000d4e8000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8c27a460 RDI: ffffffff8c27a420 RBP: ffffc9000d4eec00 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: ffff888125466000 R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff110170c75b3 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:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline] RIP: 0010:rcu_is_watching+0x9/0xb0 kernel/rcu/tree.c:751 Code: 3f 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 <65> ff 05 a0 fa 70 11 e8 0b 87 02 0a 89 c3 83 f8 08 73 65 49 bf 00 RSP: 0018:ffffc9000d4eed30 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffffff90b46b01 RCX: 0000000080000001 RDX: ffffc9000d4eee01 RSI: ffffffff81767a45 RDI: ffffffff8e7602e0 RBP: dffffc0000000000 R08: ffffc9000d4ef100 R09: 0000000000000000 R10: ffffc9000d4eeed8 R11: fffff52001a9dddd R12: ffffc9000d4ef110 R13: ffffffff81767a45 R14: ffffffff8e7602e0 R15: ffffffff81767a45 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x4b/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/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 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5532 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_kmalloc+0x22/0xb0 mm/kasan/common.c:406 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_node_noprof+0x3ef/0x6b0 mm/slub.c:5351 kmalloc_node_noprof include/linux/slab.h:1093 [inline] __get_vm_area_node+0x13f/0x300 mm/vmalloc.c:3221 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4202 bpf_check+0x1ae/0x1ce00 kernel/bpf/verifier.c:25870 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3089 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6229 __do_sys_bpf kernel/bpf/syscall.c:6342 [inline] __se_sys_bpf kernel/bpf/syscall.c:6340 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6340 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: 0033:0x7ff90419c629 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:00007ff905065028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff904415fa0 RCX: 00007ff90419c629 RDX: 0000000000000070 RSI: 0000200000000440 RDI: 0000000000000005 RBP: 00007ff904232b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff904416038 R14: 00007ff904415fa0 R15: 00007ffd66283538 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__rb_change_child include/linux/rbtree_augmented.h:204 [inline] RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:242 [inline] RIP: 0010:rb_erase+0x3e6/0xe60 lib/rbtree.c:443 Code: 4d 85 ed 75 7b 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 0a 62 87 f6 4d 8b 2c 24 41 83 e5 01 49 f7 dd 4d 21 fd eb 75 <48> 89 d8 48 c1 e8 03 80 3c 28 00 0f 84 a5 05 00 00 48 89 df e8 d1 RSP: 0018:ffffc90000a08ca8 EFLAGS: 00000046 RAX: 1ffff110170e517c RBX: ffff8880b8728350 RCX: dffffc0000000000 RDX: 0000000000010000 RSI: ffff8880b8728350 RDI: ffff8880b8728be8 RBP: dffffc0000000000 R08: ffffffff9a4e1be3 R09: 1ffffffff349c37c R10: dffffc0000000000 R11: fffffbfff349c37d R12: ffff8880b8728be0 R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880b8728f78 FS: 0000000000000000(0000) GS:ffff888125566000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055de314ba4b0 CR3: 00000000595fe000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rb_erase_cached include/linux/rbtree.h:154 [inline] timerqueue_del+0xae/0x100 lib/timerqueue.c:57 __remove_hrtimer kernel/time/hrtimer.c:1122 [inline] __run_hrtimer kernel/time/hrtimer.c:1765 [inline] __hrtimer_run_queues+0x37b/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline] RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478 Code: 0f 84 44 ff ff ff e8 52 28 21 00 fb eb 44 e8 4a 28 21 00 e8 45 ae 08 0a 4d 85 f6 74 94 e8 3b 28 21 00 fb 48 c7 c7 20 27 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 16 RSP: 0018:ffffc90000a67ba0 EFLAGS: 00000293 RAX: ffffffff81a46455 RBX: ffffffff81a462cf RCX: ffff88801f693c80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e752720 RBP: ffffc90000a67c50 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: 0000000000000000 R13: 000000000000003e R14: 0000000000000200 R15: 1ffff9200014cf78 _printk+0xdd/0x130 kernel/printk/printk.c:2504 check_hung_task kernel/hung_task.c:255 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:331 [inline] watchdog+0xb45/0x1030 kernel/hung_task.c:515 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245