list_del corruption, ffff888020a28ab0->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: 4199 Comm: syz.4.94 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__list_del_entry_valid+0xe5/0x120 lib/list_debug.c:53
Code: 4c 89 f6 e8 5d 2c 25 06 0f 0b 48 c7 c7 40 08 d9 8a 4c 89 f6 e8 4c 2c 25 06 0f 0b 48 c7 c7 a0 08 d9 8a 4c 89 f6 e8 3b 2c 25 06 <0f> 0b 48 c7 c7 00 09 d9 8a 4c 89 f6 e8 2a 2c 25 06 0f 0b 48 c7 c7
RSP: 0018:ffffc90004c3f510 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000100 RCX: e8aa61728d640100
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffff888020a28a00 R08: ffffffff81668a3c R09: ffffed10172067a8
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88805cdaa800 R14: ffff888020a28ab0 R15: dead000000000122
FS:  00007f817f62b6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002008c030 CR3: 0000000074f14000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:132 [inline]
 list_del include/linux/list.h:146 [inline]
 p9_fd_cancelled+0x95/0x220 net/9p/trans_fd.c:736
 p9_client_flush+0x392/0x570 net/9p/client.c:681
 p9_client_rpc+0xb35/0x1290 net/9p/client.c:788
 p9_client_create+0x9b4/0x1000 net/9p/client.c:1056
 v9fs_session_init+0x1fe/0x1910 fs/9p/v9fs.c:409
 v9fs_mount+0x72/0x860 fs/9p/vfs_super.c:126
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1528
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3005
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f818040dff9
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:00007f817f62b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f81805c6208 RCX: 00007f818040dff9
RDX: 0000000020000400 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f8180480296 R08: 0000000020000280 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f81805c6208 R15: 00007ffd2e4b85e8
 </TASK>
Modules linked in:
---[ end trace 33acfdb6a0bfe629 ]---
RIP: 0010:__list_del_entry_valid+0xe5/0x120 lib/list_debug.c:53
Code: 4c 89 f6 e8 5d 2c 25 06 0f 0b 48 c7 c7 40 08 d9 8a 4c 89 f6 e8 4c 2c 25 06 0f 0b 48 c7 c7 a0 08 d9 8a 4c 89 f6 e8 3b 2c 25 06 <0f> 0b 48 c7 c7 00 09 d9 8a 4c 89 f6 e8 2a 2c 25 06 0f 0b 48 c7 c7
RSP: 0018:ffffc90004c3f510 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000100 RCX: e8aa61728d640100
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffff888020a28a00 R08: ffffffff81668a3c R09: ffffed10172067a8
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88805cdaa800 R14: ffff888020a28ab0 R15: dead000000000122
FS:  00007f817f62b6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002008c030 CR3: 0000000074f14000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400