syzbot

 non-paged memory
list_del corruption, ffff88807884e280->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:58!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: hci5 hci_conn_timeout
RIP: 0010:__list_del_entry_valid_or_report+0x10e/0x190 lib/list_debug.c:56
Code: 60 09 bf 8b 48 89 de e8 d0 c6 94 fc 90 0f 0b 4c 89 e7 e8 d5 26 71 fd 48 c7 c7 c0 09 bf 8b 48 89 de 4c 89 e2 e8 b3 c6 94 fc 90 <0f> 0b 4c 89 e7 e8 b8 26 71 fd 48 c7 c7 20 0a bf 8b 48 89 de 4c 89
RSP: 0018:ffffc90000bd7960 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff88807884e280 RCX: 9d3f278d1801b700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a53b4f0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba650 R12: dead000000000100
R13: dffffc0000000000 R14: dead000000000100 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000025000 CR3: 0000000050fb8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del include/linux/list.h:237 [inline]
 _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:647 [inline]
 hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:851 [inline]
 hci_cmd_sync_dequeue_once+0x24a/0x370 net/bluetooth/hci_sync.c:870
 hci_cancel_connect_sync+0xc8/0x120 net/bluetooth/hci_sync.c:-1
 hci_abort_conn+0x191/0x330 net/bluetooth/hci_conn.c:2961
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x10e/0x190 lib/list_debug.c:56
Code: 60 09 bf 8b 48 89 de e8 d0 c6 94 fc 90 0f 0b 4c 89 e7 e8 d5 26 71 fd 48 c7 c7 c0 09 bf 8b 48 89 de 4c 89 e2 e8 b3 c6 94 fc 90 <0f> 0b 4c 89 e7 e8 b8 26 71 fd 48 c7 c7 20 0a bf 8b 48 89 de 4c 89
RSP: 0018:ffffc90000bd7960 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff88807884e280 RCX: 9d3f278d1801b700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a53b4f0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba650 R12: dead000000000100
R13: dffffc0000000000 R14: dead000000000100 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31918ff8 CR3: 0000000031a66000 CR4: 0000000000350ef0