list_del corruption, ffff8880a91adfb0->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
kobject: 'loop2' (0000000050e0b138): kobject_uevent_env
CPU: 0 PID: 21501 Comm: syz-executor.1 Not tainted 4.19.83 #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
kobject: 'loop2' (0000000050e0b138): fill_kobj_path: path = '/devices/virtual/block/loop2'
Code: e8 c5 16 31 fe 0f 0b 4c 89 f6 48 c7 c7 20 40 82 87 e8 b4 16 31 fe 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 60 3f 82 87 e8 a0 16 31 fe <0f> 0b 4c 89 e2 4c 89 f6 48 c7 c7 c0 3f 82 87 e8 8c 16 31 fe 0f 0b
RSP: 0018:ffff88807c9ef698 EFLAGS: 00010286
RAX: 000000000000004e RBX: 1ffff1100f93dee1 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81553f06 RDI: ffffed100f93dec5
RBP: ffff88807c9ef6b0 R08: 000000000000004e R09: ffffed1015d05079
R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: dead000000000200
R13: dead000000000100 R14: ffff8880a91adfb0 R15: ffff8880a91adfb8
FS:  00007fe285545700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbfc7f27b98 CR3: 00000000981c6000 CR4: 00000000001406f0
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+0x3c/0x1c0 net/9p/trans_fd.c:725
 p9_client_flush+0x1b7/0x1f0 net/9p/client.c:690
 p9_client_rpc+0x101a/0x1220 net/9p/client.c:797
 p9_client_version net/9p/client.c:968 [inline]
 p9_client_create+0xb7f/0x1400 net/9p/client.c:1068
 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:421
 v9fs_mount+0x7d/0x920 fs/9p/vfs_super.c:135
 mount_fs+0xa8/0x31f fs/super.c:1261
 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x53e/0x2bc0 fs/namespace.c:2799
 ksys_mount+0xdb/0x150 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3026
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe285544c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a219
RDX: 0000000020000300 RSI: 0000000020000200 RDI: 0000000000000000
RBP: 000000000075bfc8 R08: 00000000200005c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe2855456d4
R13: 00000000004c6d0d R14: 00000000004dc520 R15: 00000000ffffffff
Modules linked in:
---[ end trace 7644bf2375775900 ]---
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4f lib/list_debug.c:45
Code: e8 c5 16 31 fe 0f 0b 4c 89 f6 48 c7 c7 20 40 82 87 e8 b4 16 31 fe 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 60 3f 82 87 e8 a0 16 31 fe <0f> 0b 4c 89 e2 4c 89 f6 48 c7 c7 c0 3f 82 87 e8 8c 16 31 fe 0f 0b
RSP: 0018:ffff88807c9ef698 EFLAGS: 00010286
RAX: 000000000000004e RBX: 1ffff1100f93dee1 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81553f06 RDI: ffffed100f93dec5
RBP: ffff88807c9ef6b0 R08: 000000000000004e R09: ffffed1015d05079
R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: dead000000000200
R13: dead000000000100 R14: ffff8880a91adfb0 R15: ffff8880a91adfb8
FS:  00007fe285545700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbfc7f27b98 CR3: 00000000981c6000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400