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Subject4.19-rcX: WARN_ON() arch/arm64/kernel/setup.c:271 reserve_memblock_reserved_regions
This on my dragonboard 410c:

...
[ 0.170657] WARNING: CPU: 2 PID: 1 at arch/arm64/kernel/setup.c:271 reserve_memblock_reserved_regions+0xd4/0x150
[ 0.170666] Modules linked in:
[ 0.170680] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.19.0-rc7-dirty #3
[ 0.170687] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[ 0.170696] pstate: 20000005 (nzCv daif -PAN -UAO)
[ 0.170707] pc : reserve_memblock_reserved_regions+0xd4/0x150
[ 0.170718] lr : reserve_memblock_reserved_regions+0xcc/0x150
[ 0.170725] sp : ffff000008033d30
[ 0.170731] x29: ffff000008033d30 x28: ffff000009048050
[ 0.170744] x27: ffff000009048078 x26: ffff000008f871b0
[ 0.170755] x25: 0000000000000000 x24: 0000000000488020
[ 0.170767] x23: 00000000bfffffff x22: ffff000008f3ca28
[ 0.170778] x21: ffff000008e61840 x20: ffff0000090e9000
[ 0.170789] x19: ffff80003a218e00 x18: 0000000000000000
[ 0.170800] x17: 0000000000000000 x16: 0000000000000000
[ 0.170811] x15: 0000000000000000 x14: 0000000000000400
[ 0.170822] x13: 0000000000000000 x12: 0000000000000028
[ 0.170833] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f
[ 0.170844] x9 : 0000000000000000 x8 : ffff80003a218e80
[ 0.170855] x7 : 0000000000000000 x6 : ffff80003d9ffc70
[ 0.170866] x5 : 0000000000000000 x4 : 00000000bfffffff
[ 0.170877] x3 : 00000000bff00000 x2 : 0000000000000000
[ 0.170888] x1 : ffff800009ff0000 x0 : 0000000000000000
[ 0.170899] Call trace:
[ 0.170910] reserve_memblock_reserved_regions+0xd4/0x150
[ 0.170921] do_one_initcall+0x58/0x170
[ 0.170931] kernel_init_freeable+0x1a4/0x264
[ 0.170942] kernel_init+0x10/0x108
[ 0.170952] ret_from_fork+0x10/0x18
[ 0.170962] ---[ end trace c7ce9242331f7319 ]---
[ 0.170974] name: reserved res: [mem 0xbff00000-0xbfffffff flags 0x200]
...

that memory region corresponds to the ramoops node:

reserved-memory {
ramoops@bff00000{
compatible = "ramoops";
reg = <0x0 0xbff00000 0x0 0x100000>;

record-size = <0x20000>;
console-size = <0x20000>;
ftrace-size = <0x20000>;
};
};

According to the comment in reserve_memblock_reserved_regions():

/*
* We expected memblock_reserve() regions to conflict with
* memory created by request_standard_resources().
*/

and the reserved-memory region evades this condition, but i'm not entirely sure how to
properly fix this - any idea?
--
bye,
p.

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