swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
Revision db110a99d3367936058727ff4798e3a39c707969 authored by Aneesh Kumar K.V on 26 February 2022, 03:10:56 UTC, committed by Linus Torvalds on 26 February 2022, 17:51:17 UTC
This fixes the below crash: kernel BUG at include/linux/mm.h:2373! cpu 0x5d: Vector: 700 (Program Check) at [c00000003c6e76e0] pc: c000000000581a54: pmd_to_page+0x54/0x80 lr: c00000000058d184: move_hugetlb_page_tables+0x4e4/0x5b0 sp: c00000003c6e7980 msr: 9000000000029033 current = 0xc00000003bd8d980 paca = 0xc000200fff610100 irqmask: 0x03 irq_happened: 0x01 pid = 9349, comm = hugepage-mremap kernel BUG at include/linux/mm.h:2373! move_hugetlb_page_tables+0x4e4/0x5b0 (link register) move_hugetlb_page_tables+0x22c/0x5b0 (unreliable) move_page_tables+0xdbc/0x1010 move_vma+0x254/0x5f0 sys_mremap+0x7c0/0x900 system_call_exception+0x160/0x2c0 the kernel can't use huge_pte_offset before it set the pte entry because a page table lookup check for huge PTE bit in the page table to differentiate between a huge pte entry and a pointer to pte page. A huge_pte_alloc won't mark the page table entry huge and hence kernel should not use huge_pte_offset after a huge_pte_alloc. Link: https://lkml.kernel.org/r/20220211063221.99293-1-aneesh.kumar@linux.ibm.com Fixes: 550a7d60bd5e ("mm, hugepages: add mremap() support for hugepage backed vma") Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by: Mina Almasry <almasrymina@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent bbcf7b0
Tip revision: d1221cea11fca0f6946bdd032a45b22cecfc0f99 authored by Linus Torvalds on 13 September 2022, 13:11:38 UTC
Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Tip revision: d1221ce
File | Mode | Size |
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Documentation | ||
LICENSES | ||
arch | ||
block | ||
certs | ||
crypto | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | -rw-r--r-- | 16.6 KB |
.cocciconfig | -rw-r--r-- | 59 bytes |
.get_maintainer.ignore | -rw-r--r-- | 71 bytes |
.gitattributes | -rw-r--r-- | 62 bytes |
.gitignore | -rw-r--r-- | 1.9 KB |
.mailmap | -rw-r--r-- | 21.5 KB |
COPYING | -rw-r--r-- | 496 bytes |
CREDITS | -rw-r--r-- | 98.8 KB |
Kbuild | -rw-r--r-- | 1.3 KB |
Kconfig | -rw-r--r-- | 555 bytes |
MAINTAINERS | -rw-r--r-- | 627.6 KB |
Makefile | -rw-r--r-- | 63.5 KB |
README | -rw-r--r-- | 727 bytes |
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