linux-kernel - Re: vdso-related userspace crashes on 5.5 mips64

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Message-ID: <CAHmME9q313BD8R+_P=mkkHUgD8WW+ciTSDg8P_nn0GN-mNRv7g@mail.gmail.com>
Date:   Tue, 24 Dec 2019 15:19:20 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Paul Burton <paulburton@...nel.org>
Cc:     linux-mips@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Subject: Re: vdso-related userspace crashes on 5.5 mips64

Hi Paul,

.config is attached. This is run with:

qemu-system-mips64 -nodefaults -nographic -smp 4 -cpu MIPS64R2-generic
-machine malta -smp 1 -m $(grep -q CONFIG_DEBUG_KMEMLEAK=y
/home/zx2c4/Projects/WireGuard/src/tests/qemu/../../../qemu-build/mips64/linux-linus-git/.config
&& echo 1G || echo 256M) -serial stdio -serial
file:/home/zx2c4/Projects/WireGuard/src/tests/qemu/../../../qemu-build/mips64/result
-no-reboot -monitor none -kernel
/home/zx2c4/Projects/WireGuard/src/tests/qemu/../../../qemu-build/mips64/linux-linus-git/vmlinux

This patch appears to "fix" the problem:
https://lore.kernel.org/linux-mips/20191224135404.389039-1-Jason@zx2c4.com/
though I don't yet have a handle on exactly what's causing the prior
crash.

Thanks,
Jason

Download attachment ".config" of type "application/octet-stream" (40449 bytes)