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SubjectBUG in mm/page-writeback.c:2652

I am fuzzing linux 4.17-rc4 with BTRFS and I encountered a BUG in
mm/page-writeback.c error described below. This bug has occured 3
times in our fuzzing campaign.

Here is the full stack trace:

Truncated Stack Trace:

Here is a C reproducer:

My linux configs:

It appears that there is a fault injection inside of create_io_em
during the slab allocation for the path. After that
extent_clear_unlock_delalloc gets called. I don't know if the
extent_map start and end are well defined in this case.

Shankara Pailoor

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