non-paged memory list_del corruption, ffff888079935900->prev is LIST_POISON2 (dead000000000122) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:61! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 15044 Comm: syz.2.2203 Not tainted 6.14.0-rc1-next-20250207-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__list_del_entry_valid_or_report+0x12c/0x190 lib/list_debug.c:59 Code: 8c 4c 89 fe 48 89 da e8 a2 63 36 fc 90 0f 0b 48 89 df e8 27 e0 13 fd 48 c7 c7 60 ce 60 8c 4c 89 fe 48 89 da e8 85 63 36 fc 90 <0f> 0b 4c 89 e7 e8 0a e0 13 fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 db RSP: 0018:ffffc9000483fcb8 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000122 RCX: a81e42016040e400 RDX: ffffc90014159000 RSI: 000000000000537a RDI: 000000000000537b RBP: dffffc0000000000 R08: ffffffff819f3f6c R09: 1ffffffff20376ce R10: dffffc0000000000 R11: fffffbfff20376cf R12: dead000000000122 R13: dffffc0000000000 R14: ffff888032d048d8 R15: ffff888079935900 FS: 00007f9f91a176c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9f91a16f98 CR3: 000000007c6e6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_rcu include/linux/rculist.h:168 [inline] hci_chan_del+0x70/0x1b0 net/bluetooth/hci_conn.c:2858 l2cap_conn_free net/bluetooth/l2cap_core.c:1816 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_conn_put+0x70/0xe0 net/bluetooth/l2cap_core.c:1830 l2cap_sock_shutdown+0xa8a/0x1020 net/bluetooth/l2cap_sock.c:1377 __sys_shutdown_sock net/socket.c:2413 [inline] __sys_shutdown net/socket.c:2429 [inline] __do_sys_shutdown net/socket.c:2434 [inline] __se_sys_shutdown net/socket.c:2432 [inline] __x64_sys_shutdown+0x13f/0x1a0 net/socket.c:2432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9f90b8cde9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9f91a17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00007f9f90da6080 RCX: 00007f9f90b8cde9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000006 RBP: 00007f9f90c0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f9f90da6080 R15: 00007fff7bb45448 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del_entry_valid_or_report+0x12c/0x190 lib/list_debug.c:59 Code: 8c 4c 89 fe 48 89 da e8 a2 63 36 fc 90 0f 0b 48 89 df e8 27 e0 13 fd 48 c7 c7 60 ce 60 8c 4c 89 fe 48 89 da e8 85 63 36 fc 90 <0f> 0b 4c 89 e7 e8 0a e0 13 fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 db RSP: 0018:ffffc9000483fcb8 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000122 RCX: a81e42016040e400 RDX: ffffc90014159000 RSI: 000000000000537a RDI: 000000000000537b RBP: dffffc0000000000 R08: ffffffff819f3f6c R09: 1ffffffff20376ce R10: dffffc0000000000 R11: fffffbfff20376cf R12: dead000000000122 R13: dffffc0000000000 R14: ffff888032d048d8 R15: ffff888079935900 FS: 00007f9f91a176c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f514ff8 CR3: 000000007c6e6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400