list_del corruption, ffff88015f686968->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: 11968 Comm: syz-executor1 Not tainted 4.19.0-rc2+ #227
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
kobject: 'loop3' (0000000078015744): kobject_uevent_env
Code: d4 fd 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 a0 44 88 e8 7a 6d d4 fd 0f 0b 4c 89 ea 48 89 de 48 c7 c7 80 a0 44 88 e8 66 6d d4 fd <0f> 0b 48 89 de 48 c7 c7 a0 a1 44 88 e8 55 6d d4 fd 0f 0b 48 89 de
RSP: 0018:ffff88015f677150 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff88015f686968 RCX: ffffc90003453000
RDX: 0000000000000000 RSI: ffffffff8164f835 RDI: 0000000000000005
RBP: ffff88015f677168 R08: ffff88018fe4c600 R09: ffffed003b5c4fe8
R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: dead000000000200
R13: dead000000000100 R14: ffff88018d040200 R15: dffffc0000000000
FS:  00007fd4ce597700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4ce575db8 CR3: 00000001c134e000 CR4: 00000000001406f0
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 p9_fd_cancelled+0x80/0x2f0 net/9p/trans_fd.c:712
 p9_client_flush+0x255/0x2a0 net/9p/client.c:691
 p9_client_rpc+0x1284/0x1480 net/9p/client.c:800
kobject: 'loop3' (0000000078015744): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (000000008c73391c): kobject_uevent_env
kobject: 'loop2' (000000008c73391c): fill_kobj_path: path = '/devices/virtual/block/loop2'
 p9_client_version net/9p/client.c:971 [inline]
 p9_client_create+0xc1b/0x160a net/9p/client.c:1058
kobject: 'loop4' (000000000585c9e4): kobject_uevent_env
kobject: 'loop4' (000000000585c9e4): fill_kobj_path: path = '/devices/virtual/block/loop4'
 v9fs_session_init+0x217/0x1a70 fs/9p/v9fs.c:400
 v9fs_mount+0x7d/0x8f0 fs/9p/vfs_super.c:135
 mount_fs+0xae/0x31d fs/super.c:1261
 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2457 [inline]
 do_mount+0x581/0x31f0 fs/namespace.c:2787
 ksys_mount+0x12d/0x140 fs/namespace.c:3003
 __do_sys_mount fs/namespace.c:3017 [inline]
 __se_sys_mount fs/namespace.c:3014 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
kobject: 'loop0' (00000000e7ba2d08): kobject_uevent_env
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
kobject: 'loop0' (00000000e7ba2d08): fill_kobj_path: path = '/devices/virtual/block/loop0'
RSP: 002b:00007fd4ce596c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd4ce5976d4 RCX: 0000000000457099
RDX: 0000000020000900 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 0000000000930280 R08: 0000000020000380 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d3228 R14: 00000000004c81cc R15: 0000000000000003
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace b735e8cceedd9c17 ]---
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
Code: d4 fd 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 a0 44 88 e8 7a 6d d4 fd 0f 0b 4c 89 ea 48 89 de 48 c7 c7 80 a0 44 88 e8 66 6d d4 fd <0f> 0b 48 89 de 48 c7 c7 a0 a1 44 88 e8 55 6d d4 fd 0f 0b 48 89 de
RSP: 0018:ffff88015f677150 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff88015f686968 RCX: ffffc90003453000
RDX: 0000000000000000 RSI: ffffffff8164f835 RDI: 0000000000000005
RBP: ffff88015f677168 R08: ffff88018fe4c600 R09: ffffed003b5c4fe8
R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: dead000000000200
R13: dead000000000100 R14: ffff88018d040200 R15: dffffc0000000000
FS:  00007fd4ce597700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4ce575db8 CR3: 00000001c134e000 CR4: 00000000001406f0