list_del corruption, ffff880185524f68->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: 11832 Comm: syz-executor1 Not tainted 4.19.0-rc8+ #63
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'loop2' (00000000c2f4e0f7): kobject_uevent_env
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
Code: d7 fd 0f 0b 4c 89 e2 48 89 de 48 c7 c7 00 91 40 88 e8 3a 95 d7 fd 0f 0b 4c 89 ea 48 89 de 48 c7 c7 a0 90 40 88 e8 26 95 d7 fd <0f> 0b 48 89 de 48 c7 c7 c0 91 40 88 e8 15 95 d7 fd 0f 0b 48 89 de
kobject: 'loop4' (0000000014a145e1): kobject_uevent_env
RSP: 0018:ffff880184c97150 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff880185524f68 RCX: ffffc90003e74000
RDX: 0000000000000000 RSI: ffffffff8164d435 RDI: 0000000000000005
RBP: ffff880184c97168 R08: ffff88018a822680 R09: ffffed003b5e4fe8
R10: ffffed003b5e4fe8 R11: ffff8801daf27f47 R12: dead000000000200
R13: dead000000000100 R14: ffff8801b71f4d00 R15: dffffc0000000000
FS:  00007f03b94b5700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 00000001c8221000 CR4: 00000000001426e0
kobject: 'loop2' (00000000c2f4e0f7): fill_kobj_path: path = '/devices/virtual/block/loop2'
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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
 p9_client_version net/9p/client.c:971 [inline]
 p9_client_create+0xc1b/0x160a net/9p/client.c:1058
 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
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f03b94b4c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457569
RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 000000000072bf00 R08: 00000000200001c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f03b94b56d4
R13: 00000000004c28a1 R14: 00000000004d3c90 R15: 00000000ffffffff
Modules linked in:
---[ end trace 6657b49ab7ce39bb ]---
kobject: 'loop4' (0000000014a145e1): fill_kobj_path: path = '/devices/virtual/block/loop4'
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
Code: d7 fd 0f 0b 4c 89 e2 48 89 de 48 c7 c7 00 91 40 88 e8 3a 95 d7 fd 0f 0b 4c 89 ea 48 89 de 48 c7 c7 a0 90 40 88 e8 26 95 d7 fd <0f> 0b 48 89 de 48 c7 c7 c0 91 40 88 e8 15 95 d7 fd 0f 0b 48 89 de
RSP: 0018:ffff880184c97150 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff880185524f68 RCX: ffffc90003e74000
RDX: 0000000000000000 RSI: ffffffff8164d435 RDI: 0000000000000005
RBP: ffff880184c97168 R08: ffff88018a822680 R09: ffffed003b5e4fe8
R10: ffffed003b5e4fe8 R11: ffff8801daf27f47 R12: dead000000000200
R13: dead000000000100 R14: ffff8801b71f4d00 R15: dffffc0000000000
FS:  00007f03b94b5700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 00000001c8221000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400