syzbot

 non-paged memory
list_del corruption, ffff88801f3c7d80->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:58!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5845 Comm: kworker/u9:9 Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci4 hci_conn_timeout
RIP: 0010:__list_del_entry_valid_or_report+0x10e/0x190 lib/list_debug.c:56
Code: e0 09 c1 8b 48 89 de e8 80 e2 6f fc 90 0f 0b 4c 89 e7 e8 85 8d 48 fd 48 c7 c7 40 0a c1 8b 48 89 de 4c 89 e2 e8 63 e2 6f fc 90 <0f> 0b 4c 89 e7 e8 68 8d 48 fd 48 c7 c7 a0 0a c1 8b 48 89 de 4c 89
RSP: 0018:ffffc90004dbfa20 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff88801f3c7d80 RCX: 3e380d5baeb58500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a5f8aa0 R08: ffffc90004dbf707 R09: 1ffff920009b7ee0
R10: dffffc0000000000 R11: fffff520009b7ee1 R12: dead000000000100
R13: dffffc0000000000 R14: dead000000000100 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff8881261f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f58e4d7d2d8 CR3: 000000002dfa0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del include/linux/list.h:229 [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:2893
 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>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x10e/0x190 lib/list_debug.c:56
Code: e0 09 c1 8b 48 89 de e8 80 e2 6f fc 90 0f 0b 4c 89 e7 e8 85 8d 48 fd 48 c7 c7 40 0a c1 8b 48 89 de 4c 89 e2 e8 63 e2 6f fc 90 <0f> 0b 4c 89 e7 e8 68 8d 48 fd 48 c7 c7 a0 0a c1 8b 48 89 de 4c 89
RSP: 0018:ffffc90004dbfa20 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff88801f3c7d80 RCX: 3e380d5baeb58500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a5f8aa0 R08: ffffc90004dbf707 R09: 1ffff920009b7ee0
R10: dffffc0000000000 R11: fffff520009b7ee1 R12: dead000000000100
R13: dffffc0000000000 R14: dead000000000100 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff8881261f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000088c030 CR3: 000000003121a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400