syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 119s! [syz.5.1753:12954]
Modules linked in:
irq event stamp: 13520247
hardirqs last  enabled at (13520246): [<ffffffff8b77fbbc>] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219
hardirqs last disabled at (13520247): [<ffffffff8b77e5ce>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (1138112): [<ffffffff818629af>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (1138112): [<ffffffff818629af>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (1138112): [<ffffffff818629af>] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
softirqs last disabled at (1138115): [<ffffffff818629af>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (1138115): [<ffffffff818629af>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (1138115): [<ffffffff818629af>] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
CPU: 1 UID: 0 PID: 12954 Comm: syz.5.1753 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:unwind_next_frame+0x113/0x23c0 arch/x86/kernel/unwind_orc.c:498
Code: 1f c6 05 5f ff 43 0e 01 48 c7 c7 e0 a2 89 8b be 65 03 00 00 48 c7 c2 20 a3 89 8b e8 97 a2 2a 00 4c 89 6c 24 78 48 89 5c 24 70 <4d> 8d 6e 50 4c 89 e8 48 c1 e8 03 48 89 44 24 38 80 3c 28 00 74 08
RSP: 0018:ffffc90000a08498 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8b791d92 RCX: 0000000000000304
RDX: 00000000c4cfcb15 RSI: ffffffff8be73860 RDI: ffffffff8be73820
RBP: dffffc0000000000 R08: ffffffff8174c0e5 R09: ffffffff8e35a320
R10: ffffc90000a080c8 R11: ffffffff81ae4560 R12: 1ffff920001410ad
R13: ffffc90000a085a0 R14: ffffc90000a08568 R15: ffffffff8174c0e5
FS:  00007f785f3f66c0(0000) GS:ffff888125a2c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f534e601000 CR3: 000000007643c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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_noprof+0x370/0x6e0 mm/slub.c:5270
 skb_clone+0x212/0x3a0 net/core/skbuff.c:2087
 hsr_forward_do net/hsr/hsr_forward.c:-1 [inline]
 hsr_forward_skb+0x1028/0x2880 net/hsr/hsr_forward.c:743
 send_hsr_supervision_frame+0x731/0xcb0 net/hsr/hsr_device.c:364
 hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 2d 37 25 f6 f7 c3 00 02 00 00 74 05 e8 40 cb 4f f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a4 44 17 f6 65 8b 05 4d b8 54 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc9000562eea0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000292 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8dad24d5 RDI: 0000000000000001
RBP: ffff8880543216e0 R08: ffffffff8fceca77 R09: 1ffffffff1f9d94e
R10: dffffc0000000000 R11: fffffbfff1f9d94f R12: ffff8880543216d8
R13: ffff8880543216c8 R14: ffffffff9a024010 R15: 1ffff1100a8642db
 debug_object_activate+0x320/0x580 lib/debugobjects.c:836
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 __call_rcu_common kernel/rcu/tree.c:3104 [inline]
 call_rcu+0x43/0x890 kernel/rcu/tree.c:3239
 thread_stack_delayed_free kernel/fork.c:287 [inline]
 free_thread_stack kernel/fork.c:379 [inline]
 release_task_stack kernel/fork.c:517 [inline]
 put_task_stack+0x133/0x1c0 kernel/fork.c:524
 finish_task_switch+0x4b3/0x920 kernel/sched/core.c:5155
 context_switch kernel/sched/core.c:5259 [inline]
 __schedule+0x14f7/0x4fb0 kernel/sched/core.c:6863
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7047
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194
 __rcu_report_exp_rnp+0x2d1/0x3d0 kernel/rcu/tree_exp.h:208
 __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438
 rcu_read_unlock include/linux/rcupdate.h:899 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1195 [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
 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]
 __kmalloc_node_noprof+0x55d/0x7f0 mm/slub.c:5663
 kmalloc_node_noprof include/linux/slab.h:987 [inline]
 __vmalloc_area_node mm/vmalloc.c:3842 [inline]
 __vmalloc_node_range_noprof+0x5d5/0x1730 mm/vmalloc.c:4051
 __vmalloc_node_noprof mm/vmalloc.c:4111 [inline]
 __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4127
 bpf_prog_alloc_no_stats+0x4a/0x4d0 kernel/bpf/core.c:106
 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:153
 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2992
 __sys_bpf+0x570/0x920 kernel/bpf/syscall.c:6164
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272
 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: 0033:0x7f786119acb9
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:00007f785f3f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7861415fa0 RCX: 00007f786119acb9
RDX: 0000000000000094 RSI: 0000200000000640 RDI: 0000000000000005
RBP: 00007f7861208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7861416038 R14: 00007f7861415fa0 R15: 00007ffedfa423b8
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3573 Comm: kworker/u8:13 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 94 b4 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 3f b0 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 23 b0
RSP: 0018:ffffc9000c9b76a0 EFLAGS: 00000293
RAX: ffffffff81b6d15d RBX: 1ffff110170e8129 RCX: ffff888031003d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000c9b77e0 R08: ffffffff8fceca77 R09: 1ffffffff1f9d94e
R10: dffffc0000000000 R11: fffffbfff1f9d94f R12: ffff8880b8740948
R13: dffffc0000000000 R14: ffff8880b863bb00 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88812592c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9598a706c0 CR3: 000000000e146000 CR4: 00000000003526f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline]
 smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2921
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xab/0x250 mm/kfence/core.c:874
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>