list_del corruption, ffff8881ebcbcd80->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:47!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 678 Comm: syz-executor.5 Not tainted 5.4.80-syzkaller-00759-ge37aca80313f #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 48 f5 6c ff 48 8b 13 4c 39 f2 75 43 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 fc 8b fe 84 4c 89 f6 31 c0 e8 b1 89 27 ff <0f> 0b 48 c7 c7 34 8c fe 84 4c 89 f6 31 c0 e8 9e 89 27 ff 0f 0b 48
RSP: 0018:ffff8881e20af498 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000100 RCX: 452ecbcf3139e500
RDX: ffffc90002eaa000 RSI: 000000000000f3ff RDI: 000000000000f400
RBP: 0000000000000005 R08: ffffffff814c5a01 R09: ffffed103ee25e08
R10: ffffed103ee25e08 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8881ebcbcd00 R14: ffff8881ebcbcd80 R15: dead000000000122
FS:  00007f82096fa700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 00000001e2bea000 CR4: 00000000001406e0
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+0x374/0x560 net/9p/client.c:675
 p9_client_rpc+0x8de/0xb80 net/9p/client.c:782
 p9_client_version+0x183/0x700 net/9p/client.c:943
 p9_client_create+0x8e5/0xb90 net/9p/client.c:1053
 v9fs_session_init+0x208/0x1a00 fs/9p/v9fs.c:406
 v9fs_mount+0x7f/0x790 fs/9p/vfs_super.c:124
 legacy_get_tree+0xde/0x170 fs/fs_context.c:647
 vfs_get_tree+0x85/0x260 fs/super.c:1547
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x18ab/0x2660 fs/namespace.c:3142
 ksys_mount+0xc2/0xf0 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3362
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f82096f9c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000021840 RCX: 000000000045deb9
RDX: 0000000020000140 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000118bf70 R08: 0000000020000580 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe9f89231f R14: 00007f82096fa9c0 R15: 000000000118bf2c
Modules linked in:
---[ end trace 5484adbae8c155c7 ]---
RIP: 0010:__list_del_entry_valid+0xbb/0x100 lib/list_debug.c:45
Code: 89 df e8 48 f5 6c ff 48 8b 13 4c 39 f2 75 43 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 fc 8b fe 84 4c 89 f6 31 c0 e8 b1 89 27 ff <0f> 0b 48 c7 c7 34 8c fe 84 4c 89 f6 31 c0 e8 9e 89 27 ff 0f 0b 48
RSP: 0018:ffff8881e20af498 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000100 RCX: 452ecbcf3139e500
RDX: ffffc90002eaa000 RSI: 000000000000f3ff RDI: 000000000000f400
RBP: 0000000000000005 R08: ffffffff814c5a01 R09: ffffed103ee25e08
R10: ffffed103ee25e08 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8881ebcbcd00 R14: ffff8881ebcbcd80 R15: dead000000000122
FS:  00007f82096fa700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 00000001e2bea000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400