BUG: loop6 has no users, but backend found I/O issued by syz.6.623/11261.
Call Trace:
     loop_queue_rq+0x82/0xcb0
     blk_mq_try_issue_directly+0x3f4/0x880
     blk_mq_submit_bio+0x21de/0x2bb0
     submit_bio_noacct_nocheck+0x2f4/0xa40
     __breadahead+0x15c/0x1f0
     nilfs_search_super_root+0x2be/0x1530
     load_nilfs+0x363/0xfb0
     nilfs_fill_super+0x1a0/0x4e0
     nilfs_get_tree+0x491/0x850
     vfs_get_tree+0x92/0x2a0
     do_new_mount+0x319/0xdc0
     __se_sys_mount+0x31d/0x420
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: loop6 has no users, but backend found I/O issued by syz.6.623/11261.
Call Trace:
     loop_queue_rq+0x82/0xcb0
     blk_mq_try_issue_directly+0x3f4/0x880
     blk_mq_submit_bio+0x21de/0x2bb0
     submit_bio_noacct_nocheck+0x2f4/0xa40
     __breadahead+0x15c/0x1f0
     nilfs_search_super_root+0x2be/0x1530
     load_nilfs+0x363/0xfb0
     nilfs_fill_super+0x1a0/0x4e0
     nilfs_get_tree+0x491/0x850
     vfs_get_tree+0x92/0x2a0
     do_new_mount+0x319/0xdc0
     __se_sys_mount+0x31d/0x420
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: loop6 has no users, but backend found I/O issued by syz.6.623/11261.
Call Trace:
     loop_queue_rq+0x82/0xcb0
     blk_mq_try_issue_directly+0x3f4/0x880
     blk_mq_submit_bio+0x21de/0x2bb0
     submit_bio_noacct_nocheck+0x2f4/0xa40
     __breadahead+0x15c/0x1f0
     nilfs_search_super_root+0x2be/0x1530
     load_nilfs+0x363/0xfb0
     nilfs_fill_super+0x1a0/0x4e0
     nilfs_get_tree+0x491/0x850
     vfs_get_tree+0x92/0x2a0
     do_new_mount+0x319/0xdc0
     __se_sys_mount+0x31d/0x420
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: loop6 has no users, but backend found I/O issued by syz.6.623/11261.
Call Trace:
     loop_queue_rq+0x82/0xcb0
     blk_mq_try_issue_directly+0x3f4/0x880
     blk_mq_submit_bio+0x21de/0x2bb0
     submit_bio_noacct_nocheck+0x2f4/0xa40
     __breadahead+0x15c/0x1f0
     nilfs_search_super_root+0x2be/0x1530
     load_nilfs+0x363/0xfb0
     nilfs_fill_super+0x1a0/0x4e0
     nilfs_get_tree+0x491/0x850
     vfs_get_tree+0x92/0x2a0
     do_new_mount+0x319/0xdc0
     __se_sys_mount+0x31d/0x420
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: loop6 has no users, but backend found I/O issued by syz.6.623/11261.
Call Trace:
     loop_queue_rq+0x82/0xcb0
     blk_mq_try_issue_directly+0x3f4/0x880
     blk_mq_submit_bio+0x21de/0x2bb0
     submit_bio_noacct_nocheck+0x2f4/0xa40
     __breadahead+0x15c/0x1f0
     nilfs_search_super_root+0x2be/0x1530
     load_nilfs+0x363/0xfb0
     nilfs_fill_super+0x1a0/0x4e0
     nilfs_get_tree+0x491/0x850
     vfs_get_tree+0x92/0x2a0
     do_new_mount+0x319/0xdc0
     __se_sys_mount+0x31d/0x420
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f