linux-kernel - Re: 5.4-rc1 boot regression with kmemleak enabled

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Message-ID: <20191105153055.GC22987@arrakis.emea.arm.com>
Date:   Tue, 5 Nov 2019 15:30:56 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Theodore Tso <tytso@....edu>, fstests <fstests@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>, Qian Cai <cai@....pw>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 5.4-rc1 boot regression with kmemleak enabled

On Tue, Nov 05, 2019 at 02:33:48PM +0200, Amir Goldstein wrote:
> On Tue, Nov 5, 2019 at 1:54 PM Catalin Marinas <catalin.marinas@....com> wrote:
> > (sorry if you got this message twice; our SMTP server went bust)
> >
> > On Tue, Nov 05, 2019 at 09:14:06AM +0200, Amir Goldstein wrote:
> > > My kvm-xfstests [1] VM doesn't boot with kmemleak enabled since commit
> > > c5665868183f ("mm: kmemleak: use the memory pool for early allocations").
> > >
> > > There is no console output when running:
> > >
> > > $ kvm -boot order=c -net none -machine type=pc,accel=kvm:tcg -cpu host \
> > >     -drive file=$ROOTFS,if=virtio,snapshot=on -vga none -nographic \
> > >     -smp 2 -m 2048 -serial mon:stdio --kernel $KERNEL \
> > >     --append 'root=/dev/vda console=ttyS0,115200'
> >
> > This was fixed in 5.4-rc4, see commit 2abd839aa7e6 ("kmemleak: Do not
> > corrupt the object_list during clean-up").
> 
> Did not fix my issue.
> Still not booting with 5.4-rc6.
> Any other suggestions?

Can you pass an earlyprintk=ttyS0,115200 (if that's the correct x86
syntax) on the kernel command line? It may print some early messages
that would help with debugging.

-- 
Catalin