list_del corruption, ffff88808f5c62b0->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10978 Comm: syz-executor.5 Not tainted 5.4.0-rc3-next-20191015 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4f lib/list_debug.c:45
Code: e8 f5 6e 15 fe 0f 0b 4c 89 f6 48 c7 c7 e0 0e e7 87 e8 e4 6e 15 fe 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 20 0e e7 87 e8 d0 6e 15 fe <0f> 0b 4c 89 e2 4c 89 f6 48 c7 c7 80 0e e7 87 e8 bc 6e 15 fe 0f 0b
RSP: 0018:ffff88807f6af768 EFLAGS: 00010286
RAX: 000000000000004e RBX: 1ffff1100fed5efb RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ce8f6 RDI: ffffed100fed5edf
RBP: ffff88807f6af780 R08: 000000000000004e R09: ffffed1015d06161
R10: ffffed1015d06160 R11: ffff8880ae830b07 R12: dead000000000122
R13: dead000000000100 R14: ffff88808f5c62b0 R15: ffff88808f5c62b8
FS:  00007efcb5c8c700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000738008 CR3: 0000000093d52000 CR4: 00000000001406f0
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+0x3c/0x1c0 net/9p/trans_fd.c:710
 p9_client_flush+0x1b7/0x1f0 net/9p/client.c:675
 p9_client_rpc+0x112f/0x12a0 net/9p/client.c:782
 p9_client_attach+0x170/0x6a0 net/9p/client.c:1134
 v9fs_session_init+0xd96/0x18c0 fs/9p/v9fs.c:455
 v9fs_mount+0x7d/0x990 fs/9p/vfs_super.c:124
 legacy_get_tree+0x108/0x220 fs/fs_context.c:647
 vfs_get_tree+0x8e/0x300 fs/super.c:1545
 do_new_mount fs/namespace.c:2823 [inline]
 do_mount+0x142e/0x1cf0 fs/namespace.c:3143
 ksys_mount+0xdb/0x150 fs/namespace.c:3352
 __do_sys_mount fs/namespace.c:3366 [inline]
 __se_sys_mount fs/namespace.c:3363 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3363
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007efcb5c8bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a59
RDX: 0000000020000100 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000075bfc8 R08: 0000000020000600 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efcb5c8c6d4
R13: 00000000004c6252 R14: 00000000004db3a8 R15: 00000000ffffffff
Modules linked in:
---[ end trace 54e4e1cd7e2c3717 ]---
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4f lib/list_debug.c:45
Code: e8 f5 6e 15 fe 0f 0b 4c 89 f6 48 c7 c7 e0 0e e7 87 e8 e4 6e 15 fe 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 20 0e e7 87 e8 d0 6e 15 fe <0f> 0b 4c 89 e2 4c 89 f6 48 c7 c7 80 0e e7 87 e8 bc 6e 15 fe 0f 0b
RSP: 0018:ffff88807f6af768 EFLAGS: 00010286
RAX: 000000000000004e RBX: 1ffff1100fed5efb RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ce8f6 RDI: ffffed100fed5edf
RBP: ffff88807f6af780 R08: 000000000000004e R09: ffffed1015d06161
R10: ffffed1015d06160 R11: ffff8880ae830b07 R12: dead000000000122
R13: dead000000000100 R14: ffff88808f5c62b0 R15: ffff88808f5c62b8
FS:  00007efcb5c8c700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000738008 CR3: 0000000093d52000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400