linux-kernel - Re: Crash in -next due to 'MIPS: Move FP usage checks into protected_{save, restore}_fp

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Message-ID: <20150727172142.GE7289@NP-P-BURTON>
Date:	Mon, 27 Jul 2015 10:21:42 -0700
From:	Paul Burton <paul.burton@...tec.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	<linux-next@...r.kernel.org>, Ralf Baechle <ralf@...ux-mips.org>,
	<linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>
Subject: Re: Crash in -next due to 'MIPS: Move FP usage checks into
 protected_{save, restore}_fp_context'

On Mon, Jul 27, 2015 at 08:06:52AM -0700, Guenter Roeck wrote:
> On Wed, Jul 15, 2015 at 09:09:18AM -0700, Guenter Roeck wrote:
> > Hi,
> > 
> > my qemu test for mipsel crashes with next-20150715 as follows.
> > 
> ping ... problem is still seen as of next-20150727.

Hi Guenter,

Apologies for the delay. Could you share your affected kernel
configuration & which userland you're running?

I've just tested with a malta_defconfig kernel & a buildroot based
initramfs without problems, and things are also fine on my physical
MIPSr6 setups. If you have any directions with which I can reproduce
this problem that would be great.

Thanks,
    Paul

> 
> > ...
> > Btrfs loaded
> > console [netcon0] enabled
> > netconsole: network logging started
> > Freeing unused kernel memory: 284K (808f9000 - 80940000)
> > Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000008
> > 
> > Bisect points to commit 'MIPS: Move FP usage checks into protected_{save,
> > restore}_fp_context'. Bisect log is as follows.
> > 
> > The problem is not seen with bit endian qemu test.
> > 
> > Please let me know if there is anything I can do to help debugging
> > this problem.
> > 
> > Thanks,
> > Guenter
> > ---
> > 
> > # bad: [f4d61b2d73c1e4964ad68df238af5005485469af] Add linux-next specific files for 20150715
> > # good: [bc0195aad0daa2ad5b0d76cce22b167bc3435590] Linux 4.2-rc2
> > git bisect start 'HEAD' 'v4.2-rc2'
> > # bad: [897f492ee766d354b949f3838cbfda8978cfd3cd] Merge remote-tracking branch 'crypto/master'
> > git bisect bad 897f492ee766d354b949f3838cbfda8978cfd3cd
> > # bad: [687fe9993e4fbe728113086eb9525360465694e6] Merge remote-tracking branch 'mips/mips-for-linux-next'
> > git bisect bad 687fe9993e4fbe728113086eb9525360465694e6
> > # good: [a06e5ae4e8d6d5846809e94d0d45afcc5a9eaf35] Merge remote-tracking branch 'omap/for-next'
> > git bisect good a06e5ae4e8d6d5846809e94d0d45afcc5a9eaf35
> > # good: [badbfaedef0876d3cffb3264512aaec8cc162c61] Merge remote-tracking branch 'tegra/for-next'
> > git bisect good badbfaedef0876d3cffb3264512aaec8cc162c61
> > # bad: [88841d986cebe1207a47cd7422f5069b2616b194] MIPS: Advertise MSA support via HWCAP when present
> > git bisect bad 88841d986cebe1207a47cd7422f5069b2616b194
> > # good: [7c1f7b83170bc14a3e461a9b5595fcecf857da70] MIPS: octeon: Replace the homebrewn flow handler
> > git bisect good 7c1f7b83170bc14a3e461a9b5595fcecf857da70
> > # good: [186a699fdf6f0866ca980bcf5e79f54922fe52c2] MIPS: Introduce accessors for MSA vector registers
> > git bisect good 186a699fdf6f0866ca980bcf5e79f54922fe52c2
> > # bad: [1793cdaa84ed5c4025a36793f350b07b49555b57] MIPS: Skip odd double FP registers when copying FP32 sigcontext
> > git bisect bad 1793cdaa84ed5c4025a36793f350b07b49555b57
> > # good: [8a6bb0ab74eaca5f2a4e60f94df2ea5b08cdfd63] MIPS: Simplify EVA FP context handling code
> > git bisect good 8a6bb0ab74eaca5f2a4e60f94df2ea5b08cdfd63
> > # good: [6f47ebd751531249fe0e2b4d3afdfcbf9f66dbd8] MIPS: Use struct mips_abi offsets to save FP context
> > git bisect good 6f47ebd751531249fe0e2b4d3afdfcbf9f66dbd8
> > # bad: [fa3156ca734cb65f23df0f844433e75ea1da37f3] MIPS: Move FP usage checks into protected_{save, restore}_fp_context
> > git bisect bad fa3156ca734cb65f23df0f844433e75ea1da37f3
> > # first bad commit: [fa3156ca734cb65f23df0f844433e75ea1da37f3] MIPS: Move FP usage checks into protected_{save, restore}_fp_context
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