list_del corruption, ffff8881e38127d0->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: 3176 Comm: syz-executor.1 Not tainted 5.4.254-syzkaller-00011-g2ac128c04e33 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:__list_del_entry_valid+0xe5/0x120 lib/list_debug.c:53 Code: 4c 89 f6 e8 9c af 1d 02 0f 0b 48 c7 c7 80 3c fa 84 4c 89 f6 e8 8b af 1d 02 0f 0b 48 c7 c7 e0 3c fa 84 4c 89 f6 e8 7a af 1d 02 <0f> 0b 48 c7 c7 40 3d fa 84 4c 89 f6 e8 69 af 1d 02 0f 0b 48 c7 c7 RSP: 0018:ffff8881ecc97478 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: 3547828476bf0f00 RDX: ffffc90002b53000 RSI: 0000000000004cbf RDI: 0000000000004cc0 RBP: 0000000000000005 R08: ffffffff814d6752 R09: ffffed103edca9b8 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881e3812750 R14: ffff8881e38127d0 R15: dead000000000122 FS: 00007f038d6476c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffed9ccabb8 CR3: 00000001e373e000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:131 [inline] list_del include/linux/list.h:139 [inline] p9_fd_cancelled+0x72/0x1b0 net/9p/trans_fd.c:725 p9_client_flush+0x392/0x570 net/9p/client.c:677 p9_client_rpc+0xae0/0x1410 net/9p/client.c:784 p9_client_version net/9p/client.c:942 [inline] p9_client_create+0x9be/0x11a0 net/9p/client.c:1052 v9fs_session_init+0x1fa/0x19b0 fs/9p/v9fs.c:406 v9fs_mount+0x72/0x770 fs/9p/vfs_super.c:124 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648 vfs_get_tree+0x85/0x260 fs/super.c:1556 do_new_mount+0x292/0x570 fs/namespace.c:2843 do_mount+0x688/0xe10 fs/namespace.c:3163 ksys_mount+0xc2/0xf0 fs/namespace.c:3372 __do_sys_mount fs/namespace.c:3386 [inline] __se_sys_mount fs/namespace.c:3383 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3383 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Modules linked in: ---[ end trace 9af6346a321b1a8e ]--- RIP: 0010:__list_del_entry_valid+0xe5/0x120 lib/list_debug.c:53 Code: 4c 89 f6 e8 9c af 1d 02 0f 0b 48 c7 c7 80 3c fa 84 4c 89 f6 e8 8b af 1d 02 0f 0b 48 c7 c7 e0 3c fa 84 4c 89 f6 e8 7a af 1d 02 <0f> 0b 48 c7 c7 40 3d fa 84 4c 89 f6 e8 69 af 1d 02 0f 0b 48 c7 c7 RSP: 0018:ffff8881ecc97478 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: 3547828476bf0f00 RDX: ffffc90002b53000 RSI: 0000000000004cbf RDI: 0000000000004cc0 RBP: 0000000000000005 R08: ffffffff814d6752 R09: ffffed103edca9b8 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881e3812750 R14: ffff8881e38127d0 R15: dead000000000122 FS: 00007f038d6476c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffed9ccabb8 CR3: 00000001e373e000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400