list_del corruption, ffff8881142ef9d8->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:55! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8264 Comm: syz-executor.3 Not tainted 5.10.199-syzkaller-00307-gd30b996835c0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:__list_del_entry_valid+0xea/0x120 lib/list_debug.c:53 Code: 4c 89 f6 e8 67 90 54 02 0f 0b 48 c7 c7 40 06 60 85 4c 89 f6 e8 56 90 54 02 0f 0b 48 c7 c7 a0 06 60 85 4c 89 f6 e8 45 90 54 02 <0f> 0b 48 c7 c7 00 07 60 85 4c 89 f6 e8 34 90 54 02 0f 0b 48 c7 c7 RSP: 0018:ffffc90000d57468 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: fb42959f27159400 RDX: ffffc90003e42000 RSI: 0000000000001039 RDI: 000000000000103a RBP: ffffc90000d57488 R08: ffffffff81521b18 R09: ffffed103ee0a5f8 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff8881142ef9d8 R15: dead000000000122 FS: 00007f6e4fe2d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c12a000 CR3: 000000014e918000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del include/linux/list.h:146 [inline] p9_fd_cancelled+0x74/0x1d0 net/9p/trans_fd.c:725 p9_client_flush+0x392/0x570 net/9p/client.c:677 p9_client_rpc+0xae6/0x1380 net/9p/client.c:784 p9_client_create+0x9be/0x1130 net/9p/client.c:1052 v9fs_session_init+0x1fa/0x19b0 fs/9p/v9fs.c:406 v9fs_mount+0x75/0x7b0 fs/9p/vfs_super.c:126 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593 vfs_get_tree+0x88/0x290 fs/super.c:1559 do_new_mount+0x28b/0xad0 fs/namespace.c:2899 path_mount+0x56f/0xcb0 fs/namespace.c:3229 do_mount fs/namespace.c:3242 [inline] __do_sys_mount fs/namespace.c:3450 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3427 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3427 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f6e5110dae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e4fe2d0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6e5122d1f0 RCX: 00007f6e5110dae9 RDX: 0000000020000140 RSI: 0000000020000400 RDI: 0000000000000000 RBP: 00007f6e5115947a R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f6e5122d1f0 R15: 00007ffddce4b048 Modules linked in: ---[ end trace 30b5e2ede20f9a73 ]--- RIP: 0010:__list_del_entry_valid+0xea/0x120 lib/list_debug.c:53 Code: 4c 89 f6 e8 67 90 54 02 0f 0b 48 c7 c7 40 06 60 85 4c 89 f6 e8 56 90 54 02 0f 0b 48 c7 c7 a0 06 60 85 4c 89 f6 e8 45 90 54 02 <0f> 0b 48 c7 c7 00 07 60 85 4c 89 f6 e8 34 90 54 02 0f 0b 48 c7 c7 RSP: 0018:ffffc90000d57468 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: fb42959f27159400 RDX: ffffc90003e42000 RSI: 0000000000001039 RDI: 000000000000103a RBP: ffffc90000d57488 R08: ffffffff81521b18 R09: ffffed103ee0a5f8 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff8881142ef9d8 R15: dead000000000122 FS: 00007f6e4fe2d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c12a000 CR3: 000000014e918000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400