list_add double add: new=ffff888054002758, prev=ffff888054002758, next=ffff88807e722380.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:29!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 5805 Comm: syz-executor.2 Not tainted 4.14.146 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88808bc043c0 task.stack: ffff8880a1800000
kobject: 'kvm' (ffff8880a6e49450): kobject_uevent_env
RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29
RSP: 0018:ffff8880a1807a00 EFLAGS: 00010282
RAX: 0000000000000058 RBX: ffff88807e722340 RCX: 0000000000000000
RDX: 000000000000d65b RSI: ffffffff814b2e55 RDI: ffffed1014300f36
RBP: ffff8880a1807a18 R08: 0000000000000058 R09: ffff88808bc04c88
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807e722380
R13: ffff888054002758 R14: ffff888054002758 R15: ffff888054002758
FS:  00007ff97da60700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'kvm' (ffff8880a6e49450): kobject_uevent_env
CR2: 00007ffc9c237c7c CR3: 000000009f6f6000 CR4: 00000000001426f0
kobject: 'kvm' (ffff8880a6e49450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kobject: 'kvm' (ffff8880a6e49450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 __list_add include/linux/list.h:60 [inline]
 list_add_tail include/linux/list.h:93 [inline]
 p9_fd_request+0xe3/0x2b0 net/9p/trans_fd.c:679
9pnet: Insufficient options for proto=fd
 p9_client_rpc+0x21b/0x1180 net/9p/client.c:774
kobject: 'kvm' (ffff8880a6e49450): kobject_uevent_env
 p9_client_clunk+0x89/0x150 net/9p/client.c:1507
kobject: 'kvm' (ffff8880a6e49450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 v9fs_dentry_release+0x6d/0xd0 fs/9p/vfs_dentry.c:73
kobject: 'kvm' (ffff8880a6e49450): kobject_uevent_env
 __dentry_kill+0x39a/0x580 fs/dcache.c:596
kobject: 'kvm' (ffff8880a6e49450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 dentry_kill fs/dcache.c:632 [inline]
 dput.part.0+0x59f/0x750 fs/dcache.c:847
 dput fs/dcache.c:811 [inline]
 do_one_tree+0x44/0x50 fs/dcache.c:1507
 shrink_dcache_for_umount+0x67/0x140 fs/dcache.c:1521
 generic_shutdown_super+0x6d/0x370 fs/super.c:431
 kill_anon_super+0x3f/0x60 fs/super.c:1006
 v9fs_kill_super+0x3e/0xa0 fs/9p/vfs_super.c:230
 deactivate_locked_super+0x74/0xe0 fs/super.c:319
 deactivate_super fs/super.c:350 [inline]
 deactivate_super+0x85/0xa0 fs/super.c:346
 cleanup_mnt+0xb2/0x150 fs/namespace.c:1183
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1190
 task_work_run+0x114/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a09
RSP: 002b:00007ff97da5fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000459a09
RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000020000140
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff97da606d4
R13: 00000000004c91b1 R14: 00000000004e04c0 R15: 00000000ffffffff
Code: e9 56 ff ff ff 4c 89 e1 48 c7 c7 80 30 9d 86 e8 4f a8 72 fe 0f 0b 48 89 f2 4c 89 e1 4c 89 ee 48 c7 c7 c0 31 9d 86 e8 38 a8 72 fe <0f> 0b 48 89 f1 48 c7 c7 40 31 9d 86 4c 89 e6 e8 24 a8 72 fe 0f 
RIP: __list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 RSP: ffff8880a1807a00
---[ end trace 05841d2a610287d1 ]---