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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
