* BUG in mm/page-writeback.c:2652
@ 2018-05-29 17:32 shankarapailoor
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From: shankarapailoor @ 2018-05-29 17:32 UTC (permalink / raw)
To: Chris Mason, jbacik, dsterba; +Cc: linux-btrfs, linux-kernel
Hi,
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: https://pastebin.com/QcDi9xA2
Truncated Stack Trace: https://pastebin.com/GWRNmhmC
Here is a C reproducer: https://pastebin.com/xTAVB3L2
My linux configs: https://pastebin.com/6J1KMczH
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.
Regards,
Shankara Pailoor
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