watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.0.4550:21479] Modules linked in: irq event stamp: 14035149 hardirqs last enabled at (14035148): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (14035149): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13822928): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13822928): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13822928): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (13822931): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13822931): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13822931): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 21479 Comm: syz.0.4550 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:__string_src include/trace/stages/stage5_get_offsets.h:16 [inline] RIP: 0010:trace_event_get_offsets_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:perf_trace_lock_acquire+0xbf/0x420 include/trace/events/lock.h:24 Code: 80 00 00 00 00 00 00 00 48 89 74 24 38 48 8d 5e 18 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 24 ae 8b 00 48 8b 03 <48> 85 c0 48 c7 c7 00 db 8c 8b 48 0f 45 f8 48 89 7c 24 30 e8 59 cf RSP: 0018:ffffc90000007500 EFLAGS: 00000246 RAX: ffffffff8c9e54c0 RBX: ffff888142fe6240 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff888142fe6228 RDI: ffffffff8e226260 RBP: ffffc900000075e8 R08: 0000000000000000 R09: 0000000000000001 R10: dffffc0000000000 R11: fffff52000000ec4 R12: ffffffff8e226260 R13: ffff888142fe6228 R14: dffffc0000000000 R15: 1ffff92000000ea8 FS: 00007f7367c526c0(0000) GS:ffff888125929000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f79c1f456b8 CR3: 0000000075b66000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2ea/0x330 kernel/locking/lockdep.c:5831 __raw_spin_trylock include/linux/spinlock_api_smp.h:90 [inline] _raw_spin_trylock+0x47/0x80 kernel/locking/spinlock.c:138 spin_trylock include/linux/spinlock.h:361 [inline] qdisc_run_begin include/net/sch_generic.h:202 [inline] __dev_xmit_skb net/core/dev.c:4156 [inline] __dev_queue_xmit+0xf1d/0x32a0 net/core/dev.c:4785 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4037 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 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+0x147/0x4fb0 kernel/sched/core.c:-1 Code: 8b 23 49 8d 9c 24 00 24 d1 92 49 89 df 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 48 89 df e8 09 a8 b0 f6 <48> 89 5c 24 50 4c 8b 33 49 8d 5e 20 48 89 d8 48 c1 e8 03 48 b9 00 RSP: 0018:ffffc9000b4beb00 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8880b863b400 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: ffffc9000b4becf8 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff888125929000 R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff110170c7680 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7140 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:752 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x5f/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0xa8/0x190 mm/mempolicy.c:2577 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5269 __kasan_populate_vmalloc_do mm/kasan/shadow.c:364 [inline] __kasan_populate_vmalloc+0x38/0x1d0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xdbc/0x14a0 mm/vmalloc.c:2124 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3219 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4011 __vmalloc_node_noprof mm/vmalloc.c:4111 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4127 bpf_prog_alloc_no_stats+0x4a/0x4f0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:155 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2990 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6205 __do_sys_bpf kernel/bpf/syscall.c:6318 [inline] __se_sys_bpf kernel/bpf/syscall.c:6316 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6316 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7366d9acb9 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:00007f7367c52028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7367015fa0 RCX: 00007f7366d9acb9 RDX: 0000000000000090 RSI: 0000200000000140 RDI: 0000000000000005 RBP: 00007f7366e08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7367016038 R14: 00007f7367015fa0 R15: 00007fff60933398 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 21470 Comm: syz.9.4585 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:-1 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:233 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:649 [inline] RIP: 0010:cpu_online include/linux/cpumask.h:1231 [inline] RIP: 0010:__do_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x286/0x330 kernel/locking/lockdep.c:5831 Code: 24 20 4c 89 7c 24 28 4c 89 74 24 10 89 5c 24 08 65 8b 05 01 54 30 11 83 f8 08 0f 83 a9 00 00 00 89 c0 48 0f a3 05 2a b7 2f 0e <8b> 5c 24 08 4c 8b 74 24 10 4c 8b 7c 24 28 4c 8b 64 24 20 48 8b ac RSP: 0018:ffffc90000a07dc8 EFLAGS: 00000097 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff99fc07e0 RBP: ffffffff84a2bc7c R08: 0000000000000001 R09: 0000000000000000 R10: ffffc90000a07b88 R11: ffffffff816982c0 R12: 0000000000000000 R13: ffffffff99fc07e0 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f737a1246c0(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fca4cfbaa10 CR3: 0000000039034000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 debug_object_deactivate+0x6c/0x3a0 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate+0x1d/0x1e0 kernel/time/hrtimer.c:483 __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x2bc/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x70 kernel/kcov.c:217 Code: de 5b e9 b3 57 5c 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 88 ee 0c 11 <65> 8b 15 a9 ee 0c 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 RSP: 0018:ffffc90000a08278 EFLAGS: 00000297 RAX: ffffffff81cc4c64 RBX: 000000000000002c RCX: ffff88802af61e80 RDX: ffff88802af61e80 RSI: 0000000000000001 RDI: 0000000000000008 RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000a08598 R11: ffffffff81ae4550 R12: 0000000000000001 R13: 0000000000000001 R14: ffffc90000a08320 R15: 00000000000000a8 perf_trace_buf_alloc+0xc4/0x280 kernel/trace/trace_event_perf.c:415 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x19e/0x420 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2ea/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x427/0x6f0 mm/slub.c:5315 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x204/0x390 net/core/skbuff.c:690 skb_copy+0x188/0x800 net/core/skbuff.c:2162 mac80211_hwsim_tx_frame_no_nl+0xd00/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x527/0xc30 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 03 0c 18 f6 e8 1e 94 50 f6 fb bf 01 00 00 00 e3 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 a4 95 50 f6 bf 01 RSP: 0018:ffffc9000ed26e50 EFLAGS: 00000206 RAX: 0000000000d7d0eb RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000006 RSI: ffffffff8dad3129 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 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_acquire+0x98/0x330 kernel/locking/lockdep.c:5844 Code: 0f 84 d3 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 dc cd 8a 00 83 3d 55 e9 2f 0e 00 0f 84 ce 00 00 00 65 8b 05 58 9b 30 11 <85> c0 0f 85 bf 00 00 00 65 48 8b 05 a0 55 30 11 83 b8 2c 0b 00 00 RSP: 0018:ffffc9000ed26f78 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080000001 RDX: ffffc900173b7000 RSI: ffffffff8174c102 RDI: 1ffffffff1c6b464 RBP: ffffffff8174c0e5 R08: ffffc9000ed26c17 R09: 0000000000000000 R10: ffffc9000ed26c08 R11: fffff52001da4d83 R12: 0000000000000002 R13: ffffffff8e35a320 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kvmalloc_node_noprof+0x59a/0x8d0 mm/slub.c:7136 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:481 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:499 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x372/0x6c0 net/sched/sch_generic.c:870 qdisc_create_dflt+0x13b/0x4c0 net/sched/sch_generic.c:1015 mq_init+0x2db/0x690 net/sched/sch_mq.c:90 qdisc_create_dflt+0x13b/0x4c0 net/sched/sch_generic.c:1015 attach_default_qdiscs net/sched/sch_generic.c:1197 [inline] dev_activate+0x1ce/0x1150 net/sched/sch_generic.c:1251 __dev_open+0x67a/0x830 net/core/dev.c:1692 __dev_change_flags+0x1f7/0x690 net/core/dev.c:9736 netif_change_flags+0x88/0x1a0 net/core/dev.c:9799 dev_change_flags+0x130/0x260 net/core/dev_api.c:68 devinet_ioctl+0x9f2/0x1b30 net/ipv4/devinet.c:1199 inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1009 sock_do_ioctl+0x101/0x320 net/socket.c:1254 sock_ioctl+0x5c6/0x7f0 net/socket.c:1375 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f737919acb9 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:00007f737a124028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7379415fa0 RCX: 00007f737919acb9 RDX: 0000200000002280 RSI: 0000000000008914 RDI: 000000000000000d RBP: 00007f7379208bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7379416038 R14: 00007f7379415fa0 R15: 00007ffe91adaa48 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog