watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.8.2317:16088] Modules linked in: irq event stamp: 11555783 hardirqs last enabled at (11555782): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11555783): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (8291286): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (8291286): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (8291286): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (8291289): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (8291289): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (8291289): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 16088 Comm: syz.8.2317 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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_release include/trace/events/lock.h:69 [inline] RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline] RIP: 0010:lock_release+0x34f/0x3d0 kernel/locking/lockdep.c:5879 Code: e8 76 19 49 03 e9 c2 fd ff ff 4d 89 f4 4d 89 ef 65 8b 05 b8 09 7a 11 83 f8 08 0f 83 81 00 00 00 89 c0 48 0f a3 05 21 d6 6f 0e <4d> 89 fd 4d 89 e6 0f 83 cf fc ff ff 48 c7 c7 00 ee 7b 8e be 04 00 RSP: 0018:ffffc90000a07d70 EFLAGS: 00000297 RAX: 0000000000000001 RBX: ffffffff90aaa401 RCX: 0000000000000503 RDX: ffffc90000a07e01 RSI: ffffffff81767a45 RDI: ffffffff8e7602e0 RBP: dffffc0000000000 R08: ffffc90000a08f08 R09: 0000000000000000 R10: ffffc90000a07ef8 R11: fffff52000140fe1 R12: ffffffff8e7602e0 R13: ffffffff81767a45 R14: ffffffff8e7602e0 R15: ffffffff81767a45 FS: 00007f47230676c0(0000) GS:ffff888125564000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffec06480c CR3: 0000000061bd4000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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 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:4515 [inline] slab_alloc_node mm/slub.c:4844 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4896 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 __pskb_copy_fclone+0xaa/0xff0 net/core/skbuff.c:2234 __pskb_copy include/linux/skbuff.h:1447 [inline] hsr_create_tagged_frame+0x24e/0xe10 net/hsr/hsr_forward.c:350 hsr_forward_do net/hsr/hsr_forward.c:-1 [inline] hsr_forward_skb+0x1028/0x2860 net/hsr/hsr_forward.c:743 hsr_dev_xmit+0x242/0x360 net/hsr/hsr_device.c:236 __netdev_start_xmit include/linux/netdevice.h:5275 [inline] netdev_start_xmit include/linux/netdevice.h:5284 [inline] xmit_one net/core/dev.c:3871 [inline] dev_hard_start_xmit+0x2d8/0x870 net/core/dev.c:3887 __dev_queue_xmit+0x16d1/0x3890 net/core/dev.c:4840 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 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:4041 call_timer_fn+0x192/0x640 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/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:trace_call_bpf+0x4/0xb70 kernel/trace/bpf_trace.c:110 Code: 04 df 09 cc e8 8d 1d dc 09 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 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 00 RSP: 0018:ffffc9000c856c80 EFLAGS: 00000246 RAX: 1ffffd1ffffba7dc RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90011f3f000 RSI: ffffe8ffffdd3ee0 RDI: ffffffff8e62c380 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff8880b8733350 R10: dffffc0000000000 R11: fffff91ffffba7e1 R12: ffffe8ffffdd3ee0 R13: ffffffff8e62c380 R14: ffff8880b8733350 R15: ffffffff8e62c3e8 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11332 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x32d/0x410 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+0x392/0x3d0 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 __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:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 __alloc_pages_noprof mm/page_alloc.c:5284 [inline] alloc_pages_bulk_noprof+0x558/0x700 mm/page_alloc.c:5204 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline] __kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline] __kasan_populate_vmalloc+0xc1/0x1d0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4140 bpf_prog_alloc_no_stats+0x4a/0x4f0 kernel/bpf/core.c:107 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:156 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2993 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6228 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 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: 0033:0x7f472219c799 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:00007f4723067028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f4722416090 RCX: 00007f472219c799 RDX: 0000000000000094 RSI: 0000200000000440 RDI: 0000000000000005 RBP: 00007f4722232bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4722416128 R14: 00007f4722416090 R15: 00007fff3bda7658 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 16049 Comm: syz.4.2312 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:trace_hardirqs_on+0x2c/0x40 kernel/trace/trace_preemptirq.c:79 Code: 1e fa 65 8b 05 95 59 4f 11 85 c0 74 14 48 8b 3c 24 e8 88 fe ff ff 65 c7 05 7d 59 4f 11 00 00 00 00 e8 58 f3 d3 ff 48 8b 3c 24 3f f8 df 09 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc90000007850 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000302 RDX: 0000000000000002 RSI: ffffffff8e16369b RDI: ffffffff8bad7f2e RBP: 0000000000000000 R08: ffffffff90118cb7 R09: 1ffffffff2023196 R10: dffffc0000000000 R11: fffffbfff2023197 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f26e2e2d6c0(0000) GS:ffff888125464000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdc6cb81f8 CR3: 000000007dfda000 CR4: 00000000003526f0 DR0: 0000200000000140 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:430 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x65e/0xbc0 kernel/locking/qspinlock.c:325 Code: 24 48 0f b6 04 01 84 c0 75 6f 48 8b 44 24 10 80 38 00 74 1d 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 c6 44 01 06 f8 f3 90 <41> ff c4 75 bf eb 68 4c 8b 7c 24 10 4c 89 ff be 02 00 00 00 e8 e9 RSP: 0018:ffffc90000007960 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: ffffc90000007a00 RCX: 1ffff92000000f38 RDX: 0000000000000100 RSI: ffffffff8def311b RDI: ffff8880b863bcc0 RBP: ffffc90000007a70 R08: ffffffff90118cb7 R09: 1ffffffff2023196 R10: dffffc0000000000 R11: fffffbfff2023197 R12: 00000000ffff9c0f R13: 0000000000000000 R14: 1ffff1100b9379eb R15: ffff8880b863bcd4 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline] queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116 spin_lock_bh include/linux/spinlock.h:347 [inline] send_hsr_supervision_frame+0x380/0xcb0 net/hsr/hsr_device.c:330 hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421 call_timer_fn+0x192/0x640 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/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:finish_task_switch+0x30b/0x920 kernel/sched/core.c:5180 Code: c0 0f 85 ec 02 00 00 f7 03 20 00 00 00 0f 85 d9 01 00 00 4c 89 ff be 04 00 00 00 e8 6f e4 9a 00 f0 41 ff 0f 0f 84 36 01 00 00 <81> 7d a8 80 00 00 00 0f 84 3e 01 00 00 48 83 c4 30 5b 41 5c 41 5d RSP: 0018:ffffc9000c787358 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88802cb53550 RCX: 0000000080000001 RDX: 0000000000000007 RSI: ffffffff8def311b RDI: ffff88802cb534f0 RBP: ffffc9000c7873b0 R08: ffffffff90118cb7 R09: 1ffffffff2023196 R10: dffffc0000000000 R11: fffffbfff2023197 R12: ffff88802cb51e80 R13: dffffc0000000000 R14: ffff8880357d1e80 R15: 0000000000000000 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15e5/0x52d0 kernel/sched/core.c:6908 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7235 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:bytes_is_nonzero mm/kasan/generic.c:100 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x9d/0x2c0 mm/kasan/generic.c:200 Code: 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 9e 01 00 00 <49> ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd 83 e5 07 0f 84 b5 RSP: 0018:ffffc9000c7876e0 EFLAGS: 00000246 RAX: ffffc9000c787c01 RBX: ffffffffffffffff RCX: ffffffff8176884e RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc9000c787858 RBP: 0000000000000000 R08: ffffc9000c787867 R09: 1ffff920018f0f0c R10: dffffc0000000000 R11: fffff520018f0f0c R12: 0000000000000002 R13: 1ffff920018f0f03 R14: fffff520018f0f0d R15: 1ffff920018f0f0b __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 unwind_next_frame+0xeae/0x23c0 arch/x86/kernel/unwind_orc.c:607 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:5551 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:4515 [inline] slab_alloc_node mm/slub.c:4844 [inline] kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4863 __d_alloc+0x37/0x6f0 fs/dcache.c:1740 d_alloc_pseudo+0x21/0xc0 fs/dcache.c:1871 alloc_path_pseudo fs/file_table.c:364 [inline] alloc_file_pseudo+0xdd/0x240 fs/file_table.c:380 sock_alloc_file+0xb8/0x2e0 net/socket.c:483 sock_map_fd net/socket.c:513 [inline] __sys_socket+0x13c/0x1b0 net/socket.c:1756 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 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: 0033:0x7f26e1f9c799 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:00007f26e2e2d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f26e2215fa0 RCX: 00007f26e1f9c799 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f26e2032bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f26e2216038 R14: 00007f26e2215fa0 R15: 00007ffd8390c788