list_del corruption, ffff8881b46d3b10->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:47!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 17013 Comm: syz-executor.0 Not tainted 5.4.147-syzkaller-00012-g97b7ffb32f29 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0xbb/0x100 lib/list_debug.c:45
Code: 89 df e8 e8 71 6e ff 48 8b 13 4c 39 f2 75 43 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 80 9c e3 84 4c 89 f6 31 c0 e8 11 8d 2b ff <0f> 0b 48 c7 c7 e0 9c e3 84 4c 89 f6 31 c0 e8 fe 8c 2b ff 0f 0b 48
RSP: 0018:ffff8881e6e27880 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000100 RCX: d8adff18db2fb000
RDX: ffffc90004d7a000 RSI: 000000000001d873 RDI: 000000000001d874
RBP: 0000000000000005 R08: ffffffff814b2a4c R09: ffffed103edc9608
R10: ffffed103edc9608 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8881b46d3a90 R14: ffff8881b46d3b10 R15: dead000000000122
FS:  00007fbef409f700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000201cf030 CR3: 00000001e5103000 CR4: 00000000003406f0
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+0x71/0x1b0 net/9p/trans_fd.c:722
 p9_client_flush+0x2e9/0x4d0 net/9p/client.c:675
 p9_client_rpc+0x728/0x9b0 net/9p/client.c:782
 p9_client_version+0xfd/0x620 net/9p/client.c:943
 p9_client_create+0x845/0xaf0 net/9p/client.c:1053
 v9fs_session_init+0x18c/0x1820 fs/9p/v9fs.c:406
 v9fs_mount+0x72/0x780 fs/9p/vfs_super.c:124
 legacy_get_tree+0xde/0x170 fs/fs_context.c:647
 vfs_get_tree+0x83/0x260 fs/super.c:1547
 do_new_mount fs/namespace.c:2843 [inline]
 do_mount+0x17be/0x2390 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+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fbef496aae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbef409f188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbef4a7e0f0 RCX: 00007fbef496aae9
RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007fbef49c4ff7 R08: 0000000020000180 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa6cba9ef R14: 00007fbef409f300 R15: 0000000000022000
Modules linked in:
---[ end trace c336c161cb746c20 ]---
RIP: 0010:__list_del_entry_valid+0xbb/0x100 lib/list_debug.c:45
Code: 89 df e8 e8 71 6e ff 48 8b 13 4c 39 f2 75 43 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 80 9c e3 84 4c 89 f6 31 c0 e8 11 8d 2b ff <0f> 0b 48 c7 c7 e0 9c e3 84 4c 89 f6 31 c0 e8 fe 8c 2b ff 0f 0b 48
RSP: 0018:ffff8881e6e27880 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000100 RCX: d8adff18db2fb000
RDX: ffffc90004d7a000 RSI: 000000000001d873 RDI: 000000000001d874
RBP: 0000000000000005 R08: ffffffff814b2a4c R09: ffffed103edc9608
R10: ffffed103edc9608 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8881b46d3a90 R14: ffff8881b46d3b10 R15: dead000000000122
FS:  00007fbef409f700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000201cf030 CR3: 00000001e5103000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400