list_del corruption, ffff888028cd2e00->prev is LIST_POISON2 (dead000000000122)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:58!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3347 Comm: krfcommd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:__list_del_entry_valid+0xf6/0x120 lib/list_debug.c:56
Code: 48 89 de e8 6c c6 16 06 0f 0b 48 c7 c7 80 76 fe 8a 48 89 de e8 5b c6 16 06 0f 0b 48 c7 c7 e0 76 fe 8a 48 89 de e8 4a c6 16 06 <0f> 0b 48 c7 c7 40 77 fe 8a 48 89 de 4c 89 f9 e8 36 c6 16 06 0f 0b
RSP: 0000:ffffc9000e04f5e8 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff888028cd2e00 RCX: 16cbe1baa67e4f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffc9000e04f2e7 R09: 1ffff92001c09e5c
R10: dffffc0000000000 R11: fffff52001c09e5d R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888055c5a320 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3890c2b020 CR3: 000000007ea22000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:141 [inline]
 list_del_rcu include/linux/rculist.h:157 [inline]
 hci_chan_del+0x6b/0x1a0 net/bluetooth/hci_conn.c:2785
 l2cap_conn_free net/bluetooth/l2cap_core.c:1868 [inline]
 kref_put include/linux/kref.h:65 [inline]
 l2cap_conn_put net/bluetooth/l2cap_core.c:1882 [inline]
 l2cap_chan_destroy net/bluetooth/l2cap_core.c:502 [inline]
 kref_put include/linux/kref.h:65 [inline]
 l2cap_chan_put+0x1f5/0x300 net/bluetooth/l2cap_core.c:529
 l2cap_sock_release+0x179/0x1e0 net/bluetooth/l2cap_sock.c:1494
 __sock_release net/socket.c:654 [inline]
 sock_release+0x7b/0x140 net/socket.c:682
 rfcomm_session_del+0x141/0x200 net/bluetooth/rfcomm/core.c:781
 rfcomm_process_sessions net/bluetooth/rfcomm/core.c:-1 [inline]
 rfcomm_run+0x46e1/0x5f10 net/bluetooth/rfcomm/core.c:2254
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid+0xf6/0x120 lib/list_debug.c:56
Code: 48 89 de e8 6c c6 16 06 0f 0b 48 c7 c7 80 76 fe 8a 48 89 de e8 5b c6 16 06 0f 0b 48 c7 c7 e0 76 fe 8a 48 89 de e8 4a c6 16 06 <0f> 0b 48 c7 c7 40 77 fe 8a 48 89 de 4c 89 f9 e8 36 c6 16 06 0f 0b
RSP: 0000:ffffc9000e04f5e8 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff888028cd2e00 RCX: 16cbe1baa67e4f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffc9000e04f2e7 R09: 1ffff92001c09e5c
R10: dffffc0000000000 R11: fffff52001c09e5d R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888055c5a320 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7dabf7158 CR3: 000000007ea22000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400