git bisect start
# good: [94710cac0ef4ee177a63b5227664b38c95bbf703] Linux 4.18
git bisect good 94710cac0ef4ee177a63b5227664b38c95bbf703
# bad: [5b394b2ddf0347bef56e50c69a58773c94343ff3] Linux 4.19-rc1
git bisect bad 5b394b2ddf0347bef56e50c69a58773c94343ff3
# good: [54dbe75bbf1e189982516de179147208e90b5e45] Merge tag 'drm-next-2018-08-15' of git://anongit.freedesktop.org/drm/drm
git bisect good 54dbe75bbf1e189982516de179147208e90b5e45
# good: [2475c515d4031c494ff452508a8bf8c281ec6e56] Merge tag 'staging-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect good 2475c515d4031c494ff452508a8bf8c281ec6e56
# good: [c125311d96b1bfcce0f5930a4f0fdfe39ea14f7c] blk-wbt: don't maintain inflight counts if disabled
git bisect good c125311d96b1bfcce0f5930a4f0fdfe39ea14f7c
# good: [2f34a64aeac4d87e8ed8275d9f1230e18a50079c] Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
git bisect good 2f34a64aeac4d87e8ed8275d9f1230e18a50079c
# good: [aa5b1054badb60191f6a09e7ef65beacf837c5d4] Merge tag 'powerpc-4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
git bisect good aa5b1054badb60191f6a09e7ef65beacf837c5d4
# bad: [2923b27e54242acf27fd16b299e102117c82f52f] Merge tag 'libnvdimm-for-4.19_dax-memory-failure' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm
git bisect bad 2923b27e54242acf27fd16b299e102117c82f52f
# bad: [0519359784328bfa92bf0931bf0cff3b58c16932] Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
git bisect bad 0519359784328bfa92bf0931bf0cff3b58c16932
# bad: [6488a7f35eeab463f6c9c2ea34d30ca856f0bc8e] Merge branches 'arm/shmobile', 'arm/renesas', 'arm/msm', 'arm/smmu', 'arm/omap', 'x86/amd', 'x86/vt-d' and 'core' into next
git bisect bad 6488a7f35eeab463f6c9c2ea34d30ca856f0bc8e
# bad: [d9737953d85131436b09668b5e8d3389c37c1f28] iommu/vt-d: Remove the obsolete per iommu pasid tables
git bisect bad d9737953d85131436b09668b5e8d3389c37c1f28
# good: [af39507305fb83a5d3c475c2851f4d59545d8a18] iommu/vt-d: Apply global PASID in SVA
git bisect good af39507305fb83a5d3c475c2851f4d59545d8a18
# good: [cc580e41260dbf1a46269235f1f2b572137d9d03] iommu/vt-d: Per PCI device pasid table interfaces
git bisect good cc580e41260dbf1a46269235f1f2b572137d9d03
# bad: [4774cc5245700b8f4414123908c3a7a1c78e5cbb] iommu/vt-d: Apply per pci device pasid table in SVA
git bisect bad 4774cc5245700b8f4414123908c3a7a1c78e5cbb
# bad: [a7fc93fed94b173e2f9815d50f4024161b0a39ae] iommu/vt-d: Allocate and free pasid table
git bisect bad a7fc93fed94b173e2f9815d50f4024161b0a39ae
# first bad commit: [a7fc93fed94b173e2f9815d50f4024161b0a39ae] iommu/vt-d: Allocate and free pasid table