list_del corruption, ffff88804de5fb50->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:56!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 27364 Comm: syz-executor.2 Not tainted 6.8.0-rc7-syzkaller-00142-g3aaa8ce7a335 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__list_del_entry_valid_or_report+0x108/0x1c0 lib/list_debug.c:56
Code: c7 c7 60 9c 6e 8b e8 27 71 f3 fc 90 0f 0b 48 c7 c7 c0 9c 6e 8b e8 18 71 f3 fc 90 0f 0b 48 c7 c7 20 9d 6e 8b e8 09 71 f3 fc 90 <0f> 0b 48 89 ca 48 c7 c7 80 9d 6e 8b e8 f7 70 f3 fc 90 0f 0b 48 89
RSP: 0018:ffffc9000d3df9c0 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff88804de5fa90 RCX: ffffc9000f293000
RDX: 0000000000000000 RSI: ffffffff816dd946 RDI: 0000000000000005
RBP: ffff88804e657800 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000002 R12: ffff88802e87a830
R13: 0000000000000005 R14: ffff88804de5fb50 R15: ffff88804de5fb58
FS:  00007fdf049de6c0(0000) GS:ffff88806b200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31921000 CR3: 000000005dc62000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del include/linux/list.h:229 [inline]
 p9_fd_cancelled+0xa2/0x2a0 net/9p/trans_fd.c:737
 p9_client_flush.isra.0+0x34b/0x420 net/9p/client.c:615
 p9_client_rpc+0xaf5/0xc20 net/9p/client.c:738
 p9_client_getattr_dotl+0xba/0x1e0 net/9p/client.c:1732
 v9fs_mount+0x8f7/0xcd0 fs/9p/vfs_super.c:158
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14ea/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fdf0567dda9
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:00007fdf049de0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdf057ac120 RCX: 00007fdf0567dda9
RDX: 0000000020000400 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fdf056ca47a R08: 0000000020000280 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fdf057ac120 R15: 00007fff9d122038
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x108/0x1c0 lib/list_debug.c:56
Code: c7 c7 60 9c 6e 8b e8 27 71 f3 fc 90 0f 0b 48 c7 c7 c0 9c 6e 8b e8 18 71 f3 fc 90 0f 0b 48 c7 c7 20 9d 6e 8b e8 09 71 f3 fc 90 <0f> 0b 48 89 ca 48 c7 c7 80 9d 6e 8b e8 f7 70 f3 fc 90 0f 0b 48 89
RSP: 0018:ffffc9000d3df9c0 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff88804de5fa90 RCX: ffffc9000f293000
RDX: 0000000000000000 RSI: ffffffff816dd946 RDI: 0000000000000005
RBP: ffff88804e657800 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000002 R12: ffff88802e87a830
R13: 0000000000000005 R14: ffff88804de5fb50 R15: ffff88804de5fb58
FS:  00007fdf049de6c0(0000) GS:ffff88806b200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31921000 CR3: 000000005dc62000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400