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From:   Rob Herring <robherring2@gmail.com>
Date:   Mon, 15 Oct 2018 20:00:24 -0500
Message-ID: <CAL_Jsq+t2ZXhtzN0KnnU1jn+JZE3Spfgm8jT60jx8j8gEEKjFQ@mail.gmail.com>
Subject: Re: linux-next: Tree for Oct 15
To:     Stephen Rothwell <sfr@canb.auug.org.au>,
        David Miller <davem@davemloft.net>
Cc:     Guenter Roeck <linux@roeck-us.net>,
        linux-next <linux-next@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
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+davem

On Mon, Oct 15, 2018 at 3:35 PM Rob Herring <robherring2@gmail.com> wrote:
>
> On Mon, Oct 15, 2018 at 3:12 PM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > Hi Guenter,
> >
> > [Just cc'ing the PPC and devicetree folks]
> >
> > On Mon, 15 Oct 2018 11:26:37 -0700 Guenter Roeck <linux@roeck-us.net> wrote:
> > >
> > > On Mon, Oct 15, 2018 at 07:25:46PM +1100, Stephen Rothwell wrote:
> > > >
> > > > My qemu boots of a powerpc pseries_le_defconfig kernel failed today.
> > >
> > > Same here. Interestingly, this only affects little endian pseries
> > > boots; big endian works fine. I'll try to bisect later.
> > >
> > > ALl ppc qemu tests (including big endian pseries) also generate a warning.
> > >
> > > WARNING: CPU: 0 PID: 0 at mm/memblock.c:1301 .memblock_alloc_range_nid+0x20/0x68
> > > Modules linked in:
> > > CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-rc7-next-20181015 #1
> > > NIP:  c000000000f99198 LR: c000000000f99490 CTR: c000000000bb8364
> > > REGS: c000000001217a78 TRAP: 0700   Not tainted  (4.19.0-rc7-next-20181015)
> > > MSR:  0000000080021000 <CE,ME>  CR: 24000422  XER: 20000000
> > > IRQMASK: 1
> > > GPR00: c000000000f99490 c000000001217d00 c00000000121a500 00000000000000c0
> > > GPR04: 0000000000000000 0000000000000000 0000000000000000 ffffffffffffffff
> > > GPR08: 0000000000000000 00000000000000c0 0000000000000018 00000000000000b7
> > > GPR12: 0000000000000040 c000000000fe7840 0000000000000000 0000000000000000
> > > GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> > > GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> > > GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> > > GPR28: c000000000000304 c000000001262088 00000000000000c0 c000000000fea500
> > > NIP [c000000000f99198] .memblock_alloc_range_nid+0x20/0x68
> > > LR [c000000000f99490] .memblock_alloc_base+0x18/0x48
> > > Call Trace:
> > > [c000000001217d00] [c000000002a00000] 0xc000000002a00000 (unreliable)
> > > [c000000001217d80] [c000000000f99490] .memblock_alloc_base+0x18/0x48
> > > [c000000001217df0] [c000000000f7a274] .allocate_paca_ptrs+0x3c/0x74
> > > [c000000001217e70] [c000000000f78bf0] .early_init_devtree+0x288/0x320
> > > [c000000001217f10] [c000000000f79b6c] .early_setup+0x80/0x130
> > > [c000000001217f90] [c000000000000528] start_here_multiplatform+0x68/0x80
> > >
> > >
> > > sparc images crash, starting with next-20181009. Bisect with
> > > next-201810112 points to the merge of devicetree/for-next, though
> > > devicetree/for-next itself does not have the problem (bisect log
> > > attached below). The crash is in devicetree code.
> > >
> > > Crash logs:
> > > https://kerneltests.org/builders/qemu-sparc64-next/builds/981/steps/qemubuildcommand_1/logs/stdio
> > > https://kerneltests.org/builders/qemu-sparc-next/builds/975/steps/qemubuildcommand_1/logs/stdio
>
> The sparc crash appears to be related to changes I made. Looking into it.

The problem is a combination of commit 0b9871a3a8cc ("sparc: Convert
to using %pOFn instead of device_node.name") and commit 6d0a70a284be
("vsprintf: print OF node name using full_name"). The Sparc functions
in prom_*.c can't use %pOFn to ultimately construct full_name as %pOFn
is derived from full_name. Reverting the former commit gets QEMU
booting again.

David, Can you revert commit 0b9871a3a8cc. I'll have to find another approach.

Rob