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SubjectRe: BUG: unable to handle kernel NULL pointer dereference in mem16_serial_out
syzbot has bisected this bug to:

commit bd94c4077a0b2ecc35562c294f80f3659ecd8499
Author: Masahiro Yamada <>
Date: Wed Oct 28 03:46:05 2015 +0000

serial: support 16-bit register interface for console

bisection log:
start commit: e42617b8 Linux 5.5-rc1
git tree: upstream
final crash:
console output:
kernel config:
dashboard link:
syz repro:
C reproducer:

Fixes: bd94c4077a0b ("serial: support 16-bit register interface for

For information about bisection process see:

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