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Subjectlinux-next 20191204: crash in mm/pagewalk.c
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linux-next 20191204 dies a horrid death on my laptop while booting:

[ 12.344975] Write protecting the kernel read-only data: 26624k
[ 12.348497] Freeing unused kernel image (text/rodata gap) memory: 2036K
[ 12.349701] Freeing unused kernel image (rodata/data gap) memory: 1056K
[ 12.349756] BUG: kernel NULL pointer dereference, address: 0000000000000018
[ 12.349810] #PF: supervisor read access in kernel mode
[ 12.349904] #PF: error_code(0x0000) - not-present page
[ 12.349920] PGD 0 P4D 0
[ 12.349996] Oops: 0000 [#1] SMP
[ 12.350012] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G T 5.4.0-next-20191204-dirty #703
[ 12.350031] Hardware name: TOSHIBA Satellite C55-B/ZBWAA, BIOS 5.00 07/23/2015
[ 12.350055] RIP: 0010:__lock_acquire+0x465/0x810
[ 12.350132] Code: 00 85 c0 74 10 44 8b 25 79 17 ba 01 45 85 e4 0f 84 c4 30 00 00 45 31 e4 48 83 c4 30 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <49> 81 3e 60 32 0c 9d 41 ba 00 00 00 00 45 0f 45 d7 41 83 fc 01 0f
[ 12.350163] RSP: 0018:ffffb2f940053b70 EFLAGS: 00010002
[ 12.350179] RAX: ffff8896c7d74040 RBX: 0000000000000000 RCX: 0000000000000000
[ 12.350195] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000018
[ 12.350211] RBP: ffffb2f940053bc8 R08: 0000000000000001 R09: 0000000000000000
[ 12.350227] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[ 12.350305] R13: 0000000000000000 R14: 0000000000000018 R15: 0000000000000001
[ 12.350323] FS: 0000000000000000(0000) GS:ffff8897f7a00000(0000) knlGS:0000000000000000
[ 12.350340] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 12.350355] CR2: 0000000000000018 CR3: 0000000028a24000 CR4: 00000000001006f0
[ 12.350370] Call Trace:
[ 12.350385] ? __bfs+0x2c/0x300
[ 12.350404] lock_acquire+0x90/0x170
[ 12.350421] ? walk_pgd_range+0x556/0x7b0
[ 12.350441] _raw_spin_lock+0x31/0x70
[ 12.350463] ? walk_pgd_range+0x556/0x7b0
[ 12.350479] walk_pgd_range+0x556/0x7b0
[ 12.350500] __walk_page_range+0x1a5/0x1c0
[ 12.350517] ? __lock_acquired+0x1f8/0x310
[ 12.350534] walk_page_range_novma+0x72/0xc0
[ 12.350553] ptdump_walk_pgd+0x47/0x80
[ 12.350570] ptdump_walk_pgd_level_core+0xc3/0xf0
[ 12.350588] ? ptdump_walk_pgd_level_debugfs+0x30/0x30
[ 12.350683] ? 0xffffffff9b000000
[ 12.350699] ptdump_walk_pgd_level_checkwx+0x19/0x1b
[ 12.350717] mark_rodata_ro+0xc2/0xc9
[ 12.350732] ? rest_init+0x2c1/0x2eb
[ 12.350747] kernel_init+0x3d/0x105
[ 12.350761] ? rest_init+0x2eb/0x2eb
[ 12.350783] ret_from_fork+0x3a/0x50
[ 12.350797] Modules linked in:
[ 12.350810] CR2: 0000000000000018
[ 12.350822] ---[ end trace 5060898a61f6b985 ]---
[ 12.424261] probe of 1-1 returned 1 after 1829 usecs
[ 12.453678] calling sdhci_drv_init+0x0/0x4a @ 1
[ 12.527751] RIP: 0010:__lock_acquire+0x465/0x810
[ 12.527771] Code: 00 85 c0 74 10 44 8b 25 79 17 ba 01 45 85 e4 0f 84 c4 30 00 00 45 31 e4 48 83 c4 30 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <49> 81 3e 60 32 0c 9d 41 ba 00 00 00 00 45 0f 45 d7 41 83 fc 01 0f
[ 12.527792] RSP: 0018:ffffb2f940053b70 EFLAGS: 00010002
[ 12.527803] RAX: ffff8896c7d74040 RBX: 0000000000000000 RCX: 0000000000000000
[ 12.527814] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000018
[ 12.527825] RBP: ffffb2f940053bc8 R08: 0000000000000001 R09: 0000000000000000
[ 12.527836] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[ 12.527846] R13: 0000000000000000 R14: 0000000000000018 R15: 0000000000000001
[ 12.527858] FS: 0000000000000000(0000) GS:ffff8897f7a00000(0000) knlGS:0000000000000000
[ 12.527879] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 12.527894] CR2: 0000000000000018 CR3: 000000023060a000 CR4: 00000000001006f0
[ 12.527911] Kernel panic - not syncing: Fatal exception

[unhandled content-type:application/pgp-signature]
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