ac9ee01fcbfac745aaedca0393a8e1c8a33acd8d is the first bad commit
commit ac9ee01fcbfac745aaedca0393a8e1c8a33acd8d
Author: John Doe <johndoe@example.com>
Date:   Tue Aug 6 08:41:53 2019 +0000

    [compiler-rt] Implement getrandom interception
    
    Summary:
    Straightforward implementation of `getrandom` syscall and libc
    hooks.
    
    Test Plan: Local MSAN failures caused by uninstrumented `getrandom`
    calls stop failing.
    
    Patch by John Doe 3.
    
    Reviewers: jonhdoe2, johndoe
    
    Reviewed By: johndoe
    
    Subscribers: johndoe4, johndoe5, #sanitizers, llvm-commits
    
    Tags: #sanitizers, #llvm
    
    Differential Revision: https://reviews.llvm.org/D65551
    
    llvm-svn: 367999

:040000 040000 8db10511ca83cc7b0265c7703684cd386350151b 62508fdc5e8919bbb2a0bd185cc109868192cdb0 M      compiler-rt
bisect run success