list_del corruption, ffff88811d1a7208->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: 1769 Comm: syz.4.284 Not tainted 6.1.128-syzkaller-00029-g5145d157731f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__list_del_entry_valid+0xea/0x130 lib/list_debug.c:53
Code: 4c 89 fe e8 b3 b0 9d 02 0f 0b 48 c7 c7 60 22 ea 85 4c 89 fe e8 a2 b0 9d 02 0f 0b 48 c7 c7 c0 22 ea 85 4c 89 fe e8 91 b0 9d 02 <0f> 0b 48 c7 c7 20 23 ea 85 4c 89 fe e8 80 b0 9d 02 0f 0b 48 c7 c7
RSP: 0018:ffffc9000531f440 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000122 RCX: a52fae5b12929200
RDX: ffffc90003eb4000 RSI: 000000000000093d RDI: 000000000000093e
RBP: ffffc9000531f460 R08: ffffffff815b5bd5 R09: fffff52000a63e25
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff11023a34e32 R14: dead000000000100 R15: ffff88811d1a7208
FS:  00007f248ec666c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcfd832b8c CR3: 0000000126a3e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 p9_fd_cancelled+0xa5/0x230 net/9p/trans_fd.c:734
 p9_client_flush+0x3b6/0x530 net/9p/client.c:614
 p9_client_rpc+0x802/0xaa0 net/9p/client.c:734
 p9_client_create+0x9e7/0x1220 net/9p/client.c:1027
 v9fs_session_init+0x1f2/0x1950 fs/9p/v9fs.c:408
 v9fs_mount+0xca/0xb60 fs/9p/vfs_super.c:126
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:632
 vfs_get_tree+0x88/0x290 fs/super.c:1575
 do_new_mount+0x2ba/0xb30 fs/namespace.c:3056
 path_mount+0x671/0x1070 fs/namespace.c:3386
 do_mount fs/namespace.c:3399 [inline]
 __do_sys_mount fs/namespace.c:3607 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3584
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3584
 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f248dd8d169
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:00007f248ec66038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f248dfa6160 RCX: 00007f248dd8d169
RDX: 0000200000000400 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f248de0e2a0 R08: 00002000000001c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f248dfa6160 R15: 00007ffe23d03718
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid+0xea/0x130 lib/list_debug.c:53
Code: 4c 89 fe e8 b3 b0 9d 02 0f 0b 48 c7 c7 60 22 ea 85 4c 89 fe e8 a2 b0 9d 02 0f 0b 48 c7 c7 c0 22 ea 85 4c 89 fe e8 91 b0 9d 02 <0f> 0b 48 c7 c7 20 23 ea 85 4c 89 fe e8 80 b0 9d 02 0f 0b 48 c7 c7
RSP: 0018:ffffc9000531f440 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000122 RCX: a52fae5b12929200
RDX: ffffc90003eb4000 RSI: 000000000000093d RDI: 000000000000093e
RBP: ffffc9000531f460 R08: ffffffff815b5bd5 R09: fffff52000a63e25
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff11023a34e32 R14: dead000000000100 R15: ffff88811d1a7208
FS:  00007f248ec666c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcfd832b8c CR3: 0000000126a3e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400