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| author | Aaron Thompson <dev@aaront.org> | 2023-02-07 08:21:51 +0000 |
|---|---|---|
| committer | Mike Rapoport (IBM) <rppt@kernel.org> | 2023-02-07 13:07:37 +0200 |
| commit | 647037adcad00f2bab8828d3d41cd0553d41f3bd (patch) | |
| tree | ec268261b3ec093b4bd75df43c83d8e1edc4e70e /mm/failslab.c | |
| parent | 4ec5183ec48656cec489c49f989c508b68b518e3 (diff) | |
| download | linux-647037adcad00f2bab8828d3d41cd0553d41f3bd.tar.gz linux-647037adcad00f2bab8828d3d41cd0553d41f3bd.tar.bz2 linux-647037adcad00f2bab8828d3d41cd0553d41f3bd.zip | |
Revert "mm: Always release pages to the buddy allocator in memblock_free_late()."
This reverts commit 115d9d77bb0f9152c60b6e8646369fa7f6167593.
The pages being freed by memblock_free_late() have already been
initialized, but if they are in the deferred init range,
__free_one_page() might access nearby uninitialized pages when trying to
coalesce buddies. This can, for example, trigger this BUG:
BUG: unable to handle page fault for address: ffffe964c02580c8
RIP: 0010:__list_del_entry_valid+0x3f/0x70
<TASK>
__free_one_page+0x139/0x410
__free_pages_ok+0x21d/0x450
memblock_free_late+0x8c/0xb9
efi_free_boot_services+0x16b/0x25c
efi_enter_virtual_mode+0x403/0x446
start_kernel+0x678/0x714
secondary_startup_64_no_verify+0xd2/0xdb
</TASK>
A proper fix will be more involved so revert this change for the time
being.
Fixes: 115d9d77bb0f ("mm: Always release pages to the buddy allocator in memblock_free_late().")
Signed-off-by: Aaron Thompson <dev@aaront.org>
Link: https://lore.kernel.org/r/20230207082151.1303-1-dev@aaront.org
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Diffstat (limited to 'mm/failslab.c')
0 files changed, 0 insertions, 0 deletions