------------[ cut here ]------------
WARNING: CPU: 1 PID: 5869 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 1 UID: 0 PID: 5869 Comm: kworker/u9:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: hci6 hci_cmd_work
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 20 34 b0 99 be 04 00 00 00 e8 e3 2b 7c 00 4c 89 f7 b8 01 00 00 00 87 05 55 3d 09 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 40 f2 13 8e 74 47 48 c7 c0 60 d0 a3 8f 48 c1 e8
RSP: 0018:ffffc90000a08bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000212 RCX: ffffffff81a6f6bd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e13f240
RBP: ffffc90000a08e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3360684 R12: 0000000000002904
R13: 1ffff110170e75f2 R14: ffffffff8e13f240 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2f30e2d44b CR3: 0000000028cb2000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
 handle_softirqs+0x286/0x870 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_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
Code: c0 75 4c 83 3b 00 74 3a 48 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89 df e8 1b 60 b0 00 48 8b 3b e8 63 bf 19 00 <85> c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 00 60 b0 00 48 8b 03
RSP: 0018:ffffc90002e67488 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90002e674f0 RCX: 68a8b304581b7e00
RDX: 0000000000000001 RSI: ffffffff8dba895d RDI: ffffffff8222edd2
RBP: ffffc90002e67530 R08: ffffc90002e67507 R09: ffffc90002e674f8
R10: dffffc0000000000 R11: fffff520005ccea1 R12: ffff8880294a5a00
R13: 1ffff920005ccec0 R14: dffffc0000000000 R15: 1ffff920005cce9e
 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
 discard_slab mm/slub.c:2758 [inline]
 __put_partials+0x156/0x1a0 mm/slub.c:3223
 put_cpu_partial+0x17c/0x250 mm/slub.c:3298
 __slab_free+0x2d5/0x3c0 mm/slub.c:4565
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4191 [inline]
 slab_alloc_node mm/slub.c:4240 [inline]
 kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4247
 skb_clone+0x212/0x3a0 net/core/skbuff.c:2049
 hci_send_cmd_sync net/bluetooth/hci_core.c:4104 [inline]
 hci_cmd_work+0xe1/0x6e0 net/bluetooth/hci_core.c:4141
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	c0 75 4c 83          	shlb   $0x83,0x4c(%rbp)
   4:	3b 00                	cmp    (%rax),%eax
   6:	74 3a                	je     0x42
   8:	48 83 c3 48          	add    $0x48,%rbx
   c:	49 89 df             	mov    %rbx,%r15
   f:	49 c1 ef 03          	shr    $0x3,%r15
  13:	43 80 3c 37 00       	cmpb   $0x0,(%r15,%r14,1)
  18:	74 08                	je     0x22
  1a:	48 89 df             	mov    %rbx,%rdi
  1d:	e8 1b 60 b0 00       	call   0xb0603d
  22:	48 8b 3b             	mov    (%rbx),%rdi
  25:	e8 63 bf 19 00       	call   0x19bf8d
* 2a:	85 c0                	test   %eax,%eax <-- trapping instruction
  2c:	74 14                	je     0x42
  2e:	43 80 3c 37 00       	cmpb   $0x0,(%r15,%r14,1)
  33:	74 08                	je     0x3d
  35:	48 89 df             	mov    %rbx,%rdi
  38:	e8 00 60 b0 00       	call   0xb0603d
  3d:	48 8b 03             	mov    (%rbx),%rax