list_del corruption, ffff88811b6b8528->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:55! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 15305 Comm: syz-executor.4 Not tainted 5.10.157-syzkaller-01102-gf3226d86f8ce #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:__list_del_entry_valid+0xf4/0x130 lib/list_debug.c:53 Code: bf de 41 02 0f 0b 48 c7 c7 c0 0b 44 85 4c 89 f6 31 c0 e8 ac de 41 02 0f 0b 48 c7 c7 20 0c 44 85 4c 89 f6 31 c0 e8 99 de 41 02 <0f> 0b 48 c7 c7 80 0c 44 85 4c 89 f6 31 c0 e8 86 de 41 02 0f 0b 48 RSP: 0000:ffffc90009717408 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: 9bd55cddd4644300 RDX: ffffc90003f02000 RSI: 00000000000011ee RDI: 00000000000011ef RBP: ffffc90009717428 R08: ffffffff815408b8 R09: ffffed103ee2a5e8 R10: ffffed103ee2a5e8 R11: 1ffff1103ee2a5e7 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88811b6b8528 R15: dead000000000122 FS: 00007f2b41805700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002007e030 CR3: 000000011375b000 CR4: 00000000003506a0 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+0x73/0x1d0 net/9p/trans_fd.c:725 p9_client_flush+0x37b/0x570 net/9p/client.c:677 p9_client_rpc+0x83e/0xa60 net/9p/client.c:784 p9_client_version+0x179/0x680 net/9p/client.c:942 p9_client_create+0x8f5/0xbb0 net/9p/client.c:1052 v9fs_session_init+0x1ef/0x17c0 fs/9p/v9fs.c:406 v9fs_mount+0x75/0x7b0 fs/9p/vfs_super.c:126 legacy_get_tree+0xf0/0x190 fs/fs_context.c:592 vfs_get_tree+0x88/0x290 fs/super.c:1550 do_new_mount+0x289/0xad0 fs/namespace.c:2899 path_mount+0x58d/0xce0 fs/namespace.c:3229 do_mount fs/namespace.c:3242 [inline] __do_sys_mount fs/namespace.c:3450 [inline] __se_sys_mount+0x2d2/0x3c0 fs/namespace.c:3427 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3427 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f2b42ad40d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2b41805168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2b42bf4120 RCX: 00007f2b42ad40d9 RDX: 0000000020000b80 RSI: 00000000200003c0 RDI: 0000000000000000 RBP: 00007f2b42b2fae9 R08: 0000000020000600 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe93ac3bff R14: 00007f2b41805300 R15: 0000000000022000 Modules linked in: ---[ end trace 482de55fe3c57bf8 ]--- RIP: 0010:__list_del_entry_valid+0xf4/0x130 lib/list_debug.c:53 Code: bf de 41 02 0f 0b 48 c7 c7 c0 0b 44 85 4c 89 f6 31 c0 e8 ac de 41 02 0f 0b 48 c7 c7 20 0c 44 85 4c 89 f6 31 c0 e8 99 de 41 02 <0f> 0b 48 c7 c7 80 0c 44 85 4c 89 f6 31 c0 e8 86 de 41 02 0f 0b 48 RSP: 0000:ffffc90009717408 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: 9bd55cddd4644300 RDX: ffffc90003f02000 RSI: 00000000000011ee RDI: 00000000000011ef RBP: ffffc90009717428 R08: ffffffff815408b8 R09: ffffed103ee2a5e8 R10: ffffed103ee2a5e8 R11: 1ffff1103ee2a5e7 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88811b6b8528 R15: dead000000000122 FS: 00007f2b41805700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002007e030 CR3: 000000011375b000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400