linux-next: powerpc le qemu boot failure after merge of the akpm tree

[Stephen Rothwell]

Hi all,

On Thu, 31 Jan 2019 16:38:54 +1100 Stephen Rothwell <sfr at canb.auug.org.au> wrote:
>
> [I am guessing that is is something in Andrew's tree that has caused
> this.]
> 
> My qemu boot of the powerpc pseries_le_defconfig config failed like this:
> 
> htab_hash_mask    = 0x1ffff
> -----------------------------------------------------
> numa:   NODE_DATA [mem 0x7ffe7000-0x7ffebfff]
> Kernel panic - not syncing: sparse_buffer_init: Failed to allocate 2147483648 bytes align=0x10000 nid=0 from=fffffffffffffff
> CPU: 0 PID: 0 Comm: swapper Not tainted 5.0.0-rc4 #2
> Call Trace:
> [c00000000105bbd0] [c000000000b1345c] dump_stack+0xb0/0xf4 (unreliable)
> [c00000000105bc10] [c000000000111120] panic+0x168/0x3b8
> [c00000000105bcb0] [c000000000e701c8] sparse_init_nid+0x178/0x550
> [c00000000105bd70] [c000000000e709b4] sparse_init+0x210/0x238
> [c00000000105bdb0] [c000000000e468f4] initmem_init+0x1e0/0x260
> [c00000000105be80] [c000000000e3b9b0] setup_arch+0x354/0x3d4
> [c00000000105bef0] [c000000000e33afc] start_kernel+0x98/0x648
> [c00000000105bf90] [c00000000000b270] start_here_common+0x1c/0x52c

A quick bisect leads to this:

1c3c9328cde027eb875ba4692f0a5d66b0afe862 is the first bad commit
commit 1c3c9328cde027eb875ba4692f0a5d66b0afe862
Author: Mike Rapoport <rppt at linux.ibm.com>
Date:   Thu Jan 31 10:51:32 2019 +1100

    treewide: add checks for the return value of memblock_alloc*()
    
    Add check for the return value of memblock_alloc*() functions and call
    panic() in case of error.  The panic message repeats the one used by
    panicing memblock allocators with adjustment of parameters to include only
    relevant ones.
    
    The replacement was mostly automated with semantic patches like the one
    below with manual massaging of format strings.
    
    @@
    expression ptr, size, align;
    @@
    ptr = memblock_alloc(size, align);
    + if (!ptr)
    +       panic("%s: Failed to allocate %lu bytes align=0x%lx\n", __func__,
    size, align);
    
    Link: http://lkml.kernel.org/r/1548057848-15136-20-git-send-email-rppt@linux.ibm.com
    Signed-off-by: Mike Rapoport <rppt at linux.ibm.com>
    Reviewed-by: Guo Ren <ren_guo at c-sky.com>                [c-sky]
    Acked-by: Paul Burton <paul.burton at mips.com>            [MIPS]
    Acked-by: Heiko Carstens <heiko.carstens at de.ibm.com>    [s390]
    Reviewed-by: Juergen Gross <jgross at suse.com>            [Xen]
    Reviewed-by: Geert Uytterhoeven <geert at linux-m68k.org>  [m68k]
    Cc: Catalin Marinas <catalin.marinas at arm.com>
    Cc: Christophe Leroy <christophe.leroy at c-s.fr>
    Cc: Christoph Hellwig <hch at lst.de>
    Cc: "David S. Miller" <davem at davemloft.net>
    Cc: Dennis Zhou <dennis at kernel.org>
    Cc: Greentime Hu <green.hu at gmail.com>
    Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
    Cc: Guan Xuetao <gxt at pku.edu.cn>
    Cc: Guo Ren <guoren at kernel.org>
    Cc: Mark Salter <msalter at redhat.com>
    Cc: Matt Turner <mattst88 at gmail.com>
    Cc: Max Filippov <jcmvbkbc at gmail.com>
    Cc: Michael Ellerman <mpe at ellerman.id.au>
    Cc: Michal Simek <monstr at monstr.eu>
    Cc: Petr Mladek <pmladek at suse.com>
    Cc: Richard Weinberger <richard at nod.at>
    Cc: Rich Felker <dalias at libc.org>
    Cc: Rob Herring <robh+dt at kernel.org>
    Cc: Rob Herring <robh at kernel.org>
    Cc: Russell King <linux at armlinux.org.uk>
    Cc: Stafford Horne <shorne at gmail.com>
    Cc: Tony Luck <tony.luck at intel.com>
    Cc: Vineet Gupta <vgupta at synopsys.com>
    Cc: Yoshinori Sato <ysato at users.sourceforge.jp>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>

Which is just adding the panic we hit.  So, presumably, the bug is in a
preceding patch :-(

I have left the kernel not booting for today.
-- 
Cheers,
Stephen Rothwell
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