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Subjectcompaction: VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn))
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Compaction starts to crash below on linux-next today. The faulty page belongs to Node 0 DMA32 zone.
I’ll continue to narrow it down, but just want to give a headup in case someone could beat me to it.

Debug output from free_area_init_core()
[ 0.000000] KK start page = ffffea0000000040, end page = ffffea0000040000, nid = 0 DMA
[ 0.000000] KK start page = ffffea0000040000, end page = ffffea0004000000, nid = 0 DMA32
[ 0.000000] KK start page = ffffea0004000000, end page = ffffea0012000000, nid = 0 NORMAL
[ 0.000000] KK start page = ffffea0012000000, end page = ffffea0021fc0000, nid = 4 NORMAL

I don’t understand how it could end up in such a situation. There are several recent patches look
more related than some others.

- mm: rework free_area_init*() funcitons
https://lore.kernel.org/linux-mm/20200412194859.12663-1-rppt@kernel.org/
Could this somehow allow an invalid pfn to escape into the page allocator?
Especially, is it related to skip the checks in memmap_init_zone()?
https://lore.kernel.org/linux-mm/20200412194859.12663-16-rppt@kernel.org

# numactl -H
available: 8 nodes (0-7)
node 0 cpus: 0 1 16 17
node 0 size: 7951 MB
node 0 free: 4445 MB
node 1 cpus: 2 3 18 19
node 1 size: 0 MB
node 1 free: 0 MB
node 2 cpus: 4 5 20 21
node 2 size: 0 MB
node 2 free: 0 MB
node 3 cpus: 6 7 22 23
node 3 size: 0 MB
node 3 free: 0 MB
node 4 cpus: 8 9 24 25
node 4 size: 15354 MB
node 4 free: 78 MB
node 5 cpus: 10 11 26 27
node 5 size: 0 MB
node 5 free: 0 MB
node 6 cpus: 12 13 28 29
node 6 size: 0 MB
node 6 free: 0 MB
node 7 cpus: 14 15 30 31
node 7 size: 0 MB
node 7 free: 0 MB
node distances:
node 0 1 2 3 4 5 6 7
0: 10 16 16 16 32 32 32 32
1: 16 10 16 16 32 32 32 32
2: 16 16 10 16 32 32 32 32
3: 16 16 16 10 32 32 32 32
4: 32 32 32 32 10 16 16 16
5: 32 32 32 32 16 10 16 16
6: 32 32 32 32 16 16 10 16
7: 32 32 32 32 16 16 16 10

[ 6803.941550] LTP: starting swapping01 (swapping01 -i 5)
[ 6821.098489] page:ffffea0000aa0000 refcount:1 mapcount:0 mapping:000000002243743b index:0x0
[ 6821.107077] flags: 0x1fffe000001000(reserved)
[ 6821.111534] raw: 001fffe000001000 ffffea0000aa0008 ffffea0000aa0008 0000000000000000
[ 6821.119365] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 6821.127167] page dumped because: VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn))
[ 6821.135399] page_owner info is not present (never set?)
[ 6821.140717] ------------[ cut here ]------------
[ 6821.145372] kernel BUG at mm/page_alloc.c:533!
[ 6821.150075] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 6821.150083] irq event stamp: 10075005
[ 6821.150102] hardirqs last enabled at (10075005): [<ffffffff99ea403f>] do_page_fault+0x45f/0x9d7
[ 6821.156829] CPU: 17 PID: 218 Comm: kcompactd0 Not tainted 5.7.0-rc2-next-20200423+ #7
[ 6821.160522] hardirqs last disabled at (10075004): [<ffffffff99e03ed1>] trace_hardirqs_off_thunk+0x1a/0x1c
[ 6821.160535] softirqs last enabled at (10067158): [<ffffffff9ac00478>] __do_softirq+0x478/0x77f
[ 6821.169366] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 03/09/2018
[ 6821.169378] RIP: 0010:set_pfnblock_flags_mask+0x150/0x210
[ 6821.177257] softirqs last disabled at (10067149): [<ffffffff99ed22a6>] irq_exit+0xd6/0xf0
[ 6821.218362] Code: 1a 49 8d 7f 38 e8 80 ee 05 00 48 8b 45 a0 48 8b 55 a8 48 03 50 78 49 39 d4 72 1d 48 c7 c6 80 ee ef 9a 4c 89 ef e8 70 73 fb ff <0f> 0b 48 c7 c7 40 50 75 9b e8 c4 09 2b 00 4c 8b 65 d0 b9 3f 00 00
[ 6821.237457] RSP: 0018:ffffc900042ff858 EFLAGS: 00010282
[ 6821.242719] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff9a002382
[ 6821.249900] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8884535b8e6c
[ 6821.257384] RBP: ffffc900042ff8b8 R08: ffffed108a6b8459 R09: ffffed108a6b8459
[ 6821.264566] R10: ffff8884535c22c7 R11: ffffed108a6b8458 R12: 000000000002a800
[ 6821.271748] R13: ffffea0000aa0000 R14: ffff88847fff3000 R15: ffff88847fff3040
[ 6821.278930] FS: 0000000000000000(0000) GS:ffff888453580000(0000) knlGS:0000000000000000
[ 6821.287318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6821.293102] CR2: 00007fd1eb4a1000 CR3: 000000083154c000 CR4: 00000000003406e0
[ 6821.300283] Call Trace:
[ 6821.302752] isolate_freepages+0xb20/0x1140
[ 6821.307167] ? isolate_freepages_block+0x730/0x730
[ 6821.311993] ? mark_held_locks+0x34/0xb0
[ 6821.315942] ? free_unref_page+0x7d/0x90
[ 6821.319891] ? free_unref_page+0x7d/0x90
[ 6821.323842] ? check_flags.part.28+0x86/0x220
[ 6821.328234] compaction_alloc+0xdd/0x100
[ 6821.332401] migrate_pages+0x304/0x17e0
[ 6821.336277] ? __ClearPageMovable+0x100/0x100
[ 6821.340674] ? isolate_freepages+0x1140/0x1140
[ 6821.345153] compact_zone+0x1249/0x1e90
[ 6821.349020] ? compaction_suitable+0x260/0x260
[ 6821.353494] kcompactd_do_work+0x231/0x650
[ 6821.357873] ? sysfs_compact_node+0x80/0x80
[ 6821.362088] ? finish_wait+0xe6/0x110
[ 6821.365775] kcompactd+0x162/0x490
[ 6821.369202] ? kcompactd_do_work+0x650/0x650
[ 6821.373501] ? finish_wait+0x110/0x110
[ 6821.377280] ? __kasan_check_read+0x11/0x20
[ 6821.381693] ? __kthread_parkme+0xd4/0xf0
[ 6821.385729] ? kcompactd_do_work+0x650/0x650
[ 6821.390027] kthread+0x1f7/0x220
[ 6821.393280] ? kthread_create_worker_on_cpu+0xc0/0xc0
[ 6821.398369] ret_from_fork+0x27/0x50
[ 6821.401968] Modules linked in: brd vfat fat ext4 crc16 mbcache jbd2 loop kvm_amd ses kvm enclosure dax_pmem dax_pmem_core irqbypass acpi_cpufreq ip_tables x_tables xfs sd_mod smartpqi scsi_transport_sas tg3 firmware_class libphy dm_mirror dm_region_hash dm_log dm_mod
[ 6821.426127] ---[ end trace 9783087562801ccf ]---
[ 6821.430800] RIP: 0010:set_pfnblock_flags_mask+0x150/0x210
[ 6821.436410] Code: 1a 49 8d 7f 38 e8 80 ee 05 00 48 8b 45 a0 48 8b 55 a8 48 03 50 78 49 39 d4 72 1d 48 c7 c6 80 ee ef 9a 4c 89 ef e8 70 73 fb ff <0f> 0b 48 c7 c7 40 50 75 9b e8 c4 09 2b 00 4c 8b 65 d0 b9 3f 00 00
[ 6821.455319] RSP: 0018:ffffc900042ff858 EFLAGS: 00010282
[ 6821.460863] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff9a002382
[ 6821.468063] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8884535b8e6c
[ 6821.475245] RBP: ffffc900042ff8b8 R08: ffffed108a6b8459 R09: ffffed108a6b8459
[ 6821.482675] R10: ffff8884535c22c7 R11: ffffed108a6b8458 R12: 000000000002a800
[ 6821.489877] R13: ffffea0000aa0000 R14: ffff88847fff3000 R15: ffff88847fff3040
[ 6821.497062] FS: 0000000000000000(0000) GS:ffff888453580000(0000) knlGS:0000000000000000
[ 6821.505218] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6821.511284] CR2: 00007fd1eb4a1000 CR3: 000000083154c000 CR4: 00000000003406e0
[ 6821.518487] Kernel panic - not syncing: Fatal exception
[ 6821.523876] Kernel Offset: 0x18e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 6821.534915] ---[ end Kernel panic - not syncing: Fatal exception ]---
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