Re: 4.12.0-rc5+git: kernel BUG at arch/x86/mm/highmem_32.c:47

[Meelis Roos]

> > > > This is 4.12.0-rc5-00137-ga090bd4ff838 on a dual AthlonMP server tha has 
> > > > been running fine until 4.11.0 included. 4.12.0-rc5-00137-ga090bd4ff838 
> > > > was the first kernel after 4.11 that I tried and the problem happened 
> > > > while compiling next kernel from git.
> > > 
> > > I can't reproduce this in a guest. Can you send .config please?
> > 
> > Here it is.
> 
> Thanks.
> 
> So plain 4.12.0-rc7 booted all the way in the athlon guest here. So I
> either can't reproduce in the guest or I need to try linux-next. Well,
> tomorrow...

Meanwhile I saw a patch fixing something in mm/highmem_32.c and tried 
4.12 release. And it works fine now, has been compiling more than 24h.

Bisect log I did not understand:

git bisect start
# bad: [a090bd4ff8387c409732a8e059fbf264ea0bdd56] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
git bisect bad a090bd4ff8387c409732a8e059fbf264ea0bdd56
# good: [a351e9b9fc24e982ec2f0e76379a49826036da12] Linux 4.11
git bisect good a351e9b9fc24e982ec2f0e76379a49826036da12
# good: [4c174688ee92805aa5df6e06e5b625a3286e415c] Merge tag 'trace-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
git bisect good 4c174688ee92805aa5df6e06e5b625a3286e415c
# good: [36c344f3f1ffc0b1b20abd237b7401dc6687ee8f] Merge tag 'kvm-arm-for-v4.12-round2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
git bisect good 36c344f3f1ffc0b1b20abd237b7401dc6687ee8f
# good: [ac3c4aa248c5b5390c40fad1ceb0a15a53f57a36] Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
git bisect good ac3c4aa248c5b5390c40fad1ceb0a15a53f57a36
# bad: [cdbe0206783b4e86abb0150303f137e448b5e531] Merge tag 'xfs-4.12-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
git bisect bad cdbe0206783b4e86abb0150303f137e448b5e531
# bad: [16d95c43965d287987505bbd875e59e5b3c9b131] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
git bisect bad 16d95c43965d287987505bbd875e59e5b3c9b131
# good: [a34ab101a9d27a2995142b47f9857fb46fcb072a] Merge tag 'drm-fixes-for-v4.12-rc1' of git://people.freedesktop.org/~airlied/linux
git bisect good a34ab101a9d27a2995142b47f9857fb46fcb072a
# bad: [cd636458904a04de2349c728323c5d2af1203bdf] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
git bisect bad cd636458904a04de2349c728323c5d2af1203bdf
# skip: [6b402bdfdbafce241cb6789ae38d94f45641078c] Merge tag 'for-v4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply
git bisect skip 6b402bdfdbafce241cb6789ae38d94f45641078c
# good: [c67c06939ee4a24fcad1235dd9632153533fdd4d] power: supply: max17042_battery: Use sign_extend32 instead of DIY code
git bisect good c67c06939ee4a24fcad1235dd9632153533fdd4d
# good: [917362135b8a5c0680acf08807e9fc6179eb6c79] power: supply: max17042_battery: Add default platform_data fallback data
git bisect good 917362135b8a5c0680acf08807e9fc6179eb6c79
# good: [2be83da85a64773efaa407639de81bd1377f880e] thermal: devfreq_cooling: add new interface for direct power read
git bisect good 2be83da85a64773efaa407639de81bd1377f880e
# good: [a6128f47f7940d8388ca7c8623fbe24e52f8fae6] Merge branches 'thermal-core' and 'thermal-intel' into next
git bisect good a6128f47f7940d8388ca7c8623fbe24e52f8fae6
# bad: [deac8429d62ca19c1571853e2a18f60e760ee04c] Merge tag 'sound-fix-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect bad deac8429d62ca19c1571853e2a18f60e760ee04c
# bad: [6a776e47a045462a1df1a3a9592598259ffd614f] Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
git bisect bad 6a776e47a045462a1df1a3a9592598259ffd614f
# good: [bcb7dd9ef206f7d646ed8dac6fe7772083714253] thermal: bcm2835: add thermal driver for bcm2835 SoC
git bisect good bcb7dd9ef206f7d646ed8dac6fe7772083714253
# good: [05d7839aa290901429d8edcd8f7974c9df2bcaa5] thermal: mt8173: minor mtk_thermal.c cleanups
git bisect good 05d7839aa290901429d8edcd8f7974c9df2bcaa5
# good: [bb4d5e38decf3f3c6bf170d19603949abb4d4b99] Merge branch 'backup-thermal-shutdown' into next
git bisect good bb4d5e38decf3f3c6bf170d19603949abb4d4b99
# good: [cb15c81a0c1c1f7829b9809a209ecacc77f5aa63] Merge branch 'thermal-soc' into next
git bisect good cb15c81a0c1c1f7829b9809a209ecacc77f5aa63
# first bad commit: [6a776e47a045462a1df1a3a9592598259ffd614f] Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

-- 
Meelis Roos (mroos@xxxxxxxx)