sysfs: cannot create duplicate filename '/devices/virtual/bdi/7:0'
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8005 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x26 fs/sysfs/dir.c:30
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8005 Comm: syz-executor247 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967
RIP: 0010:sysfs_warn_dup.cold+0x17/0x26 fs/sysfs/dir.c:30
RSP: 0018:ffff88809100f7e8 EFLAGS: 00010282
RAX: 0000000000000042 RBX: ffff888095bf04d0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff878bd020 RDI: ffffed1012201ef3
RBP: ffff8880b41366c0 R08: 0000000000000042 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88823892c620
R13: ffff8880afd33740 R14: ffff888095bf04d8 R15: ffff8880953b2a18
 sysfs_create_dir_ns+0x16f/0x1d0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:71 [inline]
 kobject_add_internal+0x28b/0x930 lib/kobject.c:229
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_add+0x11f/0x180 lib/kobject.c:409
 device_add+0x33f/0x15c0 drivers/base/core.c:1885
 device_create_groups_vargs+0x1dc/0x250 drivers/base/core.c:2529
 device_create_vargs+0x3a/0x50 drivers/base/core.c:2569
 bdi_register_va.part.0+0x35/0x650 mm/backing-dev.c:880
 bdi_register_va mm/backing-dev.c:908 [inline]
 bdi_register+0x101/0x110 mm/backing-dev.c:905
 bdi_register_owner+0x59/0xf0 mm/backing-dev.c:915
 device_add_disk+0x5bb/0xdc0 block/genhd.c:678
 add_disk include/linux/genhd.h:396 [inline]
 loop_add+0x615/0x830 drivers/block/loop.c:1909
 loop_control_ioctl+0x11a/0x3f0 drivers/block/loop.c:2006
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fe5a3debfd9
RSP: 002b:00007ffc1116e7a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe5a3debfd9
RDX: 8000002000400000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 00007fe5a3daffc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe5a3db0050
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..