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Subjectsparc64 crashes in -next due to 'mm/vmalloc.c: replace opencoded 4-level page walkers'
Commit 'mm/vmalloc.c: replace opencoded 4-level page walkers' in -next is
supposed to fix a sparc64 crash (or at least that is how I interpret the
commit log). Unfortunately, it actually causes sparc64 images to crash
reliably, at least in my qemu tests.

...
[ 1.922450] Calibrating delay using timer specific routine.. 202.24 BogoMIPS (lpj=1011216)
[ 1.923169] pid_max: default: 32768 minimum: 301
[ 1.926342] kernel BUG at mm/memory.c:2169!
[ 1.927056] \|/ ____ \|/
[ 1.927056] "@'/ .. \`@"
[ 1.927056] /_| \__/ |_\
[ 1.927056] \__U_/
[ 1.927781] swapper/0(0): Kernel bad sw trap 5 [#1]
[ 1.928531] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc6-next-20180105 #1
[ 1.929241] TSTATE: 0000004480001605 TPC: 0000000000561c18 TNPC: 0000000000561c1c Y: 0000242f Not tainted
[ 1.930302] TPC: <apply_to_page_range+0x358/0x420>
[ 1.930904] g0: fffff8001f812970 g1: 0000000001127178 g2: 0000000001127178 g3: 0000000000000001
[ 1.931527] g4: 0000000001114300 g5: fffff8001e5e8000 g6: 0000000000b04000 g7: 000000000000000e
[ 1.932143] o0: 000000000000001f o1: 0000000000a7dec8 o2: 0000000000000879 o3: 000000000116d400
[ 1.932871] o4: 0000000000000000 o5: 0000000000a7dec8 sp: 0000000000b070e1 ret_pc: 0000000000561c10
[ 1.933563] RPC: <apply_to_page_range+0x350/0x420>
[ 1.934238] l0: 0000000000000000 l1: 0000000000002000 l2: fffff8001c10b000 l3: 0000000100080000
[ 1.934894] l4: 0000000001381b30 l5: 0000080000000000 l6: 0000000100000000 l7: 000000000116d640
[ 1.935512] i0: 000000000116d640 i1: fffffffffffffff4 i2: 0000000100080000 i3: 0000000000570100
[ 1.936118] i4: 0000000000b07a88 i5: fffff8001c10c000 i6: 0000000000b071d1 i7: 00000000005705e0
[ 1.936807] I7: <vmap_page_range_noflush+0x40/0x80>
[ 1.937463] Call Trace:
[ 1.938121] [00000000005705e0] vmap_page_range_noflush+0x40/0x80
[ 1.938786] [0000000000570650] map_vm_area+0x30/0x60
[ 1.939352] [0000000000571444] __vmalloc_node_range+0x144/0x280
[ 1.939916] [00000000005715b0] __vmalloc+0x30/0x40
[ 1.940531] [00000000011d9888] alloc_large_system_hash+0x1f4/0x2e8
[ 1.941169] [00000000011e0cdc] vfs_caches_init+0xa0/0xe0
[ 1.941788] [00000000011c4a08] start_kernel+0x40c/0x44c
[ 1.942464] [0000000000990fc0] tlb_fixup_done+0x4c/0x6c
[ 1.943713] [00000000ffd0e444] 0xffd0e444
[ 1.945067] Disabling lock debugging due to kernel taint
[ 1.946405] Caller[00000000005705e0]: vmap_page_range_noflush+0x40/0x80
[ 1.947770] Caller[0000000000570650]: map_vm_area+0x30/0x60
[ 1.948910] Caller[0000000000571444]: __vmalloc_node_range+0x144/0x280
[ 1.950058] Caller[00000000005715b0]: __vmalloc+0x30/0x40
[ 1.951135] Caller[00000000011d9888]: alloc_large_system_hash+0x1f4/0x2e8
[ 1.952149] Caller[00000000011e0cdc]: vfs_caches_init+0xa0/0xe0
[ 1.953143] Caller[00000000011c4a08]: start_kernel+0x40c/0x44c
[ 1.954209] Caller[0000000000990fc0]: tlb_fixup_done+0x4c/0x6c
[ 1.955171] Caller[00000000ffd0e444]: 0xffd0e444
[ 1.955892] Instruction DUMP:
[ 1.955982] 110029f7
[ 1.956609] 7ffb193c
[ 1.957184] 901222c8
[ 1.957763] <91d02005>
[ 1.958392] ce5fa7d7
[ 1.958922] c25fa7df
[ 1.959447] 8e01e008
[ 1.959961] 80a08001
[ 1.960519] 02600026
[ 1.961107]
[ 1.962412] Kernel panic - not syncing: Attempted to kill the idle task!

Bisect log is attached. Everything is fine after reverting the commit.

Hmmm .. where does the reference to an e-mail from me in the offending
commit come from ? Puzzled.

Guenter

---
# bad: [990b6a07d18cb30a66db3d18ab7d953806237e6a] Add linux-next specific files for 20180105
# good: [30a7acd573899fd8b8ac39236eff6468b195ac7d] Linux 4.15-rc6
git bisect start 'HEAD' 'v4.15-rc6'
# good: [4411e1d8bfc93afafc74548669d772750432e0b7] Merge remote-tracking branch 'crypto/master'
git bisect good 4411e1d8bfc93afafc74548669d772750432e0b7
# good: [fcdad798ac60727fc0a90c36815d19b1629e45a4] Merge remote-tracking branch 'devicetree/for-next'
git bisect good fcdad798ac60727fc0a90c36815d19b1629e45a4
# good: [fe14c29e6d6772e5fc7bb8dc7a7568ce6a887a8e] Merge remote-tracking branch 'staging/staging-next'
git bisect good fe14c29e6d6772e5fc7bb8dc7a7568ce6a887a8e
# good: [b8be2479df7dda35d0d73fafa3f1d9c95c6a89b6] Merge remote-tracking branch 'gpio/for-next'
git bisect good b8be2479df7dda35d0d73fafa3f1d9c95c6a89b6
# bad: [76248405844bf17c0620aea2f0e5bb751fc680b3] lib/stackdepot.c: use a non-instrumented version of memcmp()
git bisect bad 76248405844bf17c0620aea2f0e5bb751fc680b3
# good: [b852120f0251533f414c35396f151d2ddd4d3bde] mm: get 7% more pages in a pagevec
git bisect good b852120f0251533f414c35396f151d2ddd4d3bde
# bad: [2b7030305a472bd15268818282e37818eec2386b] userfaultfd: convert to use anon_inode_getfd()
git bisect bad 2b7030305a472bd15268818282e37818eec2386b
# good: [b7ebb7ed4b3c8ed9fac1ccb0f32ff3e94e697176] mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks
git bisect good b7ebb7ed4b3c8ed9fac1ccb0f32ff3e94e697176
# bad: [e8d5e9399961eeb8132d1424388177b2fb39d45c] mm-store-compound_dtor-compound_order-as-bytes-fix
git bisect bad e8d5e9399961eeb8132d1424388177b2fb39d45c
# bad: [db5b1040f112876cd727fcba462425c7777044bc] mm: align struct page more aesthetically
git bisect bad db5b1040f112876cd727fcba462425c7777044bc
# good: [ca5d231374d5a9c7c24ab4d40b553f12523df0ff] mm/zsmalloc: simplify shrinker init/destroy
git bisect good ca5d231374d5a9c7c24ab4d40b553f12523df0ff
# bad: [32534d21c2cd1c56e3b0eff16cd6c1bf0bcbe32e] mm/vmalloc.c: replace opencoded 4-level page walkers
git bisect bad 32534d21c2cd1c56e3b0eff16cd6c1bf0bcbe32e
# good: [39a80506addfe8bfb0f510dd00052816a861cbc5] mm-zsmalloc-simplify-shrinker-init-destroy-fix
git bisect good 39a80506addfe8bfb0f510dd00052816a861cbc5
# first bad commit: [32534d21c2cd1c56e3b0eff16cd6c1bf0bcbe32e] mm/vmalloc.c: replace opencoded 4-level page walkers

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