On 7/15/20 4:37 PM, John Paul Adrian Glaubitz wrote:
> Okay, kernel 5.0.0 does not suffer from this bug. So I should be able to 
> bisect
> this particular issue.
> 
> I'm glad I don't have to start bisecting with earlier kernels because these
> won't build easily with my current toolchain based on gcc-9.
> 
> Will report once I found the bad commit that introduced the problem.

Found the culprit:

c5b27a889da92f4a969d61df77bd4f79ffce57c9 is the first bad commit
commit c5b27a889da92f4a969d61df77bd4f79ffce57c9
Author: Peter Zijlstra <[email protected]>
Date:   Tue Sep 4 14:45:04 2018 +0200

    sh/tlb: Convert SH to generic mmu_gather
    
    Generic mmu_gather provides everything SH needs (range tracking and
    cache coherency).
    
    No change in behavior intended.
    
    Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
    Cc: Andrew Morton <[email protected]>
    Cc: Andy Lutomirski <[email protected]>
    Cc: Aneesh Kumar K.V <[email protected]>
    Cc: Borislav Petkov <[email protected]>
    Cc: Dave Hansen <[email protected]>
    Cc: H. Peter Anvin <[email protected]>
    Cc: Linus Torvalds <[email protected]>
    Cc: Nick Piggin <[email protected]>
    Cc: Peter Zijlstra <[email protected]>
    Cc: Rich Felker <[email protected]>
    Cc: Rik van Riel <[email protected]>
    Cc: Thomas Gleixner <[email protected]>
    Cc: Will Deacon <[email protected]>
    Cc: Yoshinori Sato <[email protected]>
    Signed-off-by: Ingo Molnar <[email protected]>

 arch/sh/include/asm/pgalloc.h |   9 +++
 arch/sh/include/asm/tlb.h     | 130 +-----------------------------------------
 2 files changed, 10 insertions(+), 129 deletions(-)

CC'ing the author (Peter Zijlstra <[email protected]>).

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - [email protected]
`. `'   Freie Universitaet Berlin - [email protected]
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