BUG: corrupted list in hci_chan

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	BUG: corrupted list in hci_chan_del (2) bluetooth	C	done		502	96d	99d	27/28	upstream: reported C repro on 2025/02/06 13:10
upstream	BUG: corrupted list in hci_chan_del bluetooth				2	1737d	1737d	0/28	auto-closed as invalid on 2020/12/12 09:03
upstream	KASAN: use-after-free Read in hci_chan_del bluetooth	C	done	done	87	1469d	1748d	0/28	auto-obsoleted due to no activity on 2023/04/13 23:02

list_del corruption. prev->next should be ffff88808538dcc0, but was (null) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:51! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 10159 Comm: syz-executor.1 Not tainted 4.14.191-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888082c1a580 task.stack: ffff88805a0f8000 RIP: 0010:__list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 RSP: 0018:ffff88805a0ff840 EFLAGS: 00010282 RAX: 0000000000000054 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff86ac0dc0 RDI: ffffed100b41fefe RBP: ffff88808538dcc0 R08: 0000000000000054 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808ecfaf00 R13: ffffffff8750f4e0 R14: 0000000000000067 R15: ffffffff85b74830 FS: 00007fd366e50700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa323149590 CR3: 0000000007c6a000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del_rcu include/linux/rculist.h:130 [inline] hci_chan_del+0x3f/0x180 net/bluetooth/hci_conn.c:1552 l2cap_conn_del+0x417/0x670 net/bluetooth/l2cap_core.c:1736 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:7435 [inline] l2cap_disconn_cfm+0x6b/0x80 net/bluetooth/l2cap_core.c:7428 hci_disconn_cfm include/net/bluetooth/hci_core.h:1226 [inline] hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1376 hci_dev_do_close+0x542/0xc50 net/bluetooth/hci_core.c:1620 hci_unregister_dev+0x170/0x7a0 net/bluetooth/hci_core.c:3191 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa08/0x27f0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:962 get_signal+0x38d/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cce9 RSP: 002b:00007fd366e4fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078bf08 RCX: 000000000045cce9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bf08 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffd2094edcf R14: 00007fd366e509c0 R15: 000000000078bf0c Code: 86 e8 1c b4 44 fe 0f 0b 48 89 f1 48 c7 c7 00 5c e4 86 4c 89 e6 e8 08 b4 44 fe 0f 0b 48 89 ee 48 c7 c7 a0 5d e4 86 e8 f7 b3 44 fe <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 e0 5c e4 86 e8 e3 b3 44 fe 0f RIP: __list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 RSP: ffff88805a0ff840 ---[ end trace 979a0fdc132e834d ]---