syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 122s! [syz.2.31:6029]
Modules linked in:
irq event stamp: 18681159
hardirqs last  enabled at (18681158): [<ffffffff8b5623c4>] irqentry_exit+0x74/0x90 kernel/entry/common.c:357
hardirqs last disabled at (18681159): [<ffffffff8b560dbe>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049
softirqs last  enabled at (14907110): [<ffffffff8185c3fa>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last  enabled at (14907110): [<ffffffff8185c3fa>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last  enabled at (14907110): [<ffffffff8185c3fa>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
softirqs last disabled at (14907113): [<ffffffff8185c3fa>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last disabled at (14907113): [<ffffffff8185c3fa>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last disabled at (14907113): [<ffffffff8185c3fa>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
CPU: 1 UID: 0 PID: 6029 Comm: syz.2.31 Not tainted 6.15.0-rc4-syzkaller-gdb22b1382b96 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_read_unlock_special+0x90/0x4c0 kernel/rcu/tree_plugin.h:694
Code: 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 e2 d3 cd 10 41 f7 c6 00 00 f0 00 74 49 48 c7 44 24 40 0e 36 e0 45 <4a> c7 04 2b 00 00 00 00 66 42 c7 44 2b 09 00 00 42 c6 44 2b 0b 00
RSP: 0018:ffffc90000a07cc0 EFLAGS: 00000206
RAX: 76b5cd0382364400 RBX: 1ffff92000140fa0 RCX: 76b5cd0382364400
RDX: 0000000000000002 RSI: ffffffff8d74afe2 RDI: ffffffff8bc1d520
RBP: ffffc90000a07db8 R08: ffffffff8f7ed577 R09: 1ffffffff1efdaae
R10: dffffc0000000000 R11: fffffbfff1efdaaf R12: ffffffff8df40c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007fec663796c0(0000) GS:ffff8881261c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca2ab67d58 CR3: 0000000026efe000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4372
 kmalloc_noprof include/linux/slab.h:905 [inline]
 add_stack_record_to_list mm/page_owner.c:172 [inline]
 inc_stack_record_count mm/page_owner.c:214 [inline]
 __set_page_owner+0x25c/0x4a0 mm/page_owner.c:333
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2392
 skb_page_frag_refill+0x179/0x320 net/core/sock.c:3100
 add_recvbuf_mergeable drivers/net/virtio_net.c:2702 [inline]
 try_fill_recv+0x88d/0x1f00 drivers/net/virtio_net.c:2757
 virtnet_receive drivers/net/virtio_net.c:2953 [inline]
 virtnet_poll+0x212d/0x2d70 drivers/net/virtio_net.c:3045
 __napi_poll+0xc4/0x480 net/core/dev.c:7324
 napi_poll net/core/dev.c:7388 [inline]
 net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 8b a1 6e f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 73 23 38 f6 65 8b 05 5c d5 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90004696d80 EFLAGS: 00000206
RAX: 76b5cd0382364400 RBX: 0000000000000246 RCX: 76b5cd0382364400
RDX: 0000000000000006 RSI: ffffffff8d74afe2 RDI: 0000000000000001
RBP: ffffc90004696e10 R08: ffffffff8f7ed577 R09: 1ffffffff1efdaae
R10: dffffc0000000000 R11: fffffbfff1efdaaf R12: dffffc0000000000
R13: ffffffff8df40c00 R14: ffffffff8df40bc0 R15: 1ffff920008d2db0
 rcu_preempt_deferred_qs_irqrestore+0x851/0xc40 kernel/rcu/tree_plugin.h:-1
 rcu_read_unlock_special+0x3fe/0x4c0 kernel/rcu/tree_plugin.h:693
 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548
 __call_rcu_common kernel/rcu/tree.c:3082 [inline]
 call_rcu+0x142/0x990 kernel/rcu/tree.c:3202
 __destroy_inode+0x2da/0x670 fs/inode.c:371
 destroy_inode fs/inode.c:394 [inline]
 evict+0x797/0x9c0 fs/inode.c:834
 __dentry_kill+0x209/0x660 fs/dcache.c:660
 dput+0x19f/0x2b0 fs/dcache.c:902
 find_next_child fs/libfs.c:603 [inline]
 simple_recursive_removal+0x2c2/0x8e0 fs/libfs.c:618
 debugfs_remove+0x5b/0x70 fs/debugfs/inode.c:805
 ieee80211_sta_debugfs_remove+0x40/0x70 net/mac80211/debugfs_sta.c:1285
 __sta_info_destroy_part2+0x352/0x450 net/mac80211/sta_info.c:1508
 __sta_info_flush+0x5e4/0x710 net/mac80211/sta_info.c:1640
 sta_info_flush net/mac80211/sta_info.h:927 [inline]
 ieee80211_ibss_disconnect+0x2da/0x7c0 net/mac80211/ibss.c:686
 ieee80211_ibss_leave+0x47/0x150 net/mac80211/ibss.c:1831
 rdev_leave_ibss net/wireless/rdev-ops.h:574 [inline]
 cfg80211_leave_ibss+0x1e4/0x410 net/wireless/ibss.c:203
 cfg80211_ibss_wext_siwfreq+0x220/0x350 net/wireless/ibss.c:321
 cfg80211_wext_siwfreq+0x225/0x810 net/wireless/wext-compat.c:781
 ioctl_standard_call+0xc8/0x1b0 net/wireless/wext-core.c:1043
 wireless_process_ioctl net/wireless/wext-core.c:-1 [inline]
 wext_ioctl_dispatch+0xeb/0x410 net/wireless/wext-core.c:1014
 wext_handle_ioctl+0x100/0x1c0 net/wireless/wext-core.c:1075
 sock_ioctl+0x15f/0x790 net/socket.c:1243
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fec6558e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec66379038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fec657b5fa0 RCX: 00007fec6558e969
RDX: 0000200000000000 RSI: 0000000000008b04 RDI: 000000000000000c
RBP: 00007fec65610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fec657b5fa0 R15: 00007ffc383bdce8
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1107 Comm: kworker/u8:6 Not tainted 6.15.0-rc4-syzkaller-gdb22b1382b96 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b
RSP: 0018:ffffc90003a5f700 EFLAGS: 00000293
RAX: ffffffff81b45620 RBX: ffff8880b883ad40 RCX: ffff888026243c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003a5f860 R08: ffffffff8f7ed577 R09: 1ffffffff1efdaae
R10: dffffc0000000000 R11: fffffbfff1efdaaf R12: 1ffff11017127e99
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b893f4c8
FS:  0000000000000000(0000) GS:ffff8881260c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000011000 CR3: 000000000dd36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
 text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665
 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>