On Mon, Sep 9, 2024 at 10:21 AM Zac Ecob <zacecob@xxxxxxxxxxxxxx> wrote: > > Hello, > > I recently received a kernel 'oops' about a divide error. > After some research, it seems that the 'div64_s64' function used for the 'MOD'/'REM' instructions boils down to an 'idiv'. > > The 'dividend' is set to INT64_MIN, and the 'divisor' to -1, then because of two's complement, there is no corresponding positive value, causing the error (at least to my understanding). > > > Apologies if this is already known / not a relevant concern. Thanks for the report. This is a new issue. Yonghong, it's related to the new signed div insn. It sounds like we need to update chk_and_div[] part of the verifier to account for signed div differently.
