Here's the bisect log:

git bisect start
# bad: [75bc37fefc4471e718ba8e651aa74673d4e0a9eb] Linux 4.17-rc4
git bisect bad 75bc37fefc4471e718ba8e651aa74673d4e0a9eb
# good: [bebc6082da0a9f5d47a1ea2edc099bf671058bd4] Linux 4.14
git bisect good bebc6082da0a9f5d47a1ea2edc099bf671058bd4
# bad: [e4ee8b85b7657d9c769b727038faabdc2e6a3412] Merge tag 'usb-4.16-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
git bisect bad e4ee8b85b7657d9c769b727038faabdc2e6a3412
# bad: [bec04432cb9036dedf89140c102b5ac03e4b3626] Merge branch 'next' of
git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
git bisect bad bec04432cb9036dedf89140c102b5ac03e4b3626
# bad: [5bbcc0f595fadb4cac0eddc4401035ec0bd95b09] Merge
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
git bisect bad 5bbcc0f595fadb4cac0eddc4401035ec0bd95b09
# bad: [2cd83ba5bede2f72cc6c79a19a1bddf576b50e88] Merge tag 'iommu-v4.15-rc1'
of git://github.com/awilliam/linux-vfio
git bisect bad 2cd83ba5bede2f72cc6c79a19a1bddf576b50e88
# bad: [449fcf3ab0baf3dde9952385e6789f2ca10c3980] Merge tag 'staging-4.15-rc1'
of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect bad 449fcf3ab0baf3dde9952385e6789f2ca10c3980
# good: [43ff2f4db9d0f76452b77cfa645f02b471143b24] Merge branch
'x86-platform-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 43ff2f4db9d0f76452b77cfa645f02b471143b24
# good: [43ff2f4db9d0f76452b77cfa645f02b471143b24] Merge branch
'x86-platform-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 43ff2f4db9d0f76452b77cfa645f02b471143b24
# good: [313144c1bcd6dd22f2375a602a8cb6efa759c8cd] Staging: rtlwifi: pci: fixed
a coding style issue
git bisect good 313144c1bcd6dd22f2375a602a8cb6efa759c8cd
# good: [b18d62891aaff49d0ee8367d4b6bb9452469f807] Merge branch
'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good b18d62891aaff49d0ee8367d4b6bb9452469f807
# bad: [990a848d537e4da966907c8ccec95bc568f2911c] Merge branches 'pm-devfreq'
and 'pm-tools'
git bisect bad 990a848d537e4da966907c8ccec95bc568f2911c
# good: [60af981c78a72255355c8e374e173b550d6742d6] Merge branch 'pm-cpufreq'
git bisect good 60af981c78a72255355c8e374e173b550d6742d6
# good: [05d658b5b57214944067fb4f62bce59200bf496f] Merge branch 'pm-sleep'
git bisect good 05d658b5b57214944067fb4f62bce59200bf496f
# bad: [1efef68262dc567f0c09da9d11924e8287cd3a8b] Merge branch 'pm-core'
git bisect bad 1efef68262dc567f0c09da9d11924e8287cd3a8b
# bad: [08810a4119aaebf6318f209ec5dd9828e969cba4] PM / core: Add NEVER_SKIP and
SMART_PREPARE driver flags
git bisect bad 08810a4119aaebf6318f209ec5dd9828e969cba4
# good: [b082ddd8a6a3aa0399763bfb58fc7bdd84c95713] PM / core: Fix kerneldoc
comments of four functions
git bisect good b082ddd8a6a3aa0399763bfb58fc7bdd84c95713
# good: [69a10ca747c2d2d7c0354a883335e097c067ed35] Merge branch 'acpi-pm' into
pm-core
git bisect good 69a10ca747c2d2d7c0354a883335e097c067ed35
# first bad commit: [08810a4119aaebf6318f209ec5dd9828e969cba4] PM / core: Add
NEVER_SKIP and SMART_PREPARE driver flags