Hi, Greg,
The 3 patches help fix the problem, that the infinite recursion reports "bus error".
Could you please add them to 3.10 stable?
thanks, :-)
Sheng
On 2/27/2015 7:14 PM, Sheng Yong wrote:
> Hi, Greg,
>
> V2:
> Backport commit 7fb08eca ("x86: mm: move mmap_sem unlock from
> mm_fault_error() to caller)" to solve lock problem on x86.
>
> V1:
> The commit 88b5d12 ("mm: propagate error from stack expansion even for
> guard page") for 3.10-stable makes the testcase get "bus error", while
> it had "segmentation fault" in older kernels.
>
> ===== testcase =====
> int main(void)
> {
> main();
> return 0;
> }
> ====================
>
> These 2 patches fix it by adding a VM_FAULT_SIGSEGV in all architecture
> fault handlers.
>
> [PATCH 1/3] is asjusted to ignore un-supported arch and driver in 3.10.
> And some files are separated or renamed in newer kernel, so [PATCH 1/3]
> is also adjusted to add the VM_FAULT_SIGSEGV handling in the original
> files in 3.10.
>
> thanks,
> Sheng
>
> Linus Torvalds (3):
> vm: add VM_FAULT_SIGSEGV handling support
> vm: make stack guard page errors return VM_FAULT_SIGSEGV rather than
> SIGBUS
> x86: mm: move mmap_sem unlock from mm_fault_error() to caller
>
> arch/alpha/mm/fault.c | 2 ++
> arch/arc/mm/fault.c | 2 ++
> arch/avr32/mm/fault.c | 2 ++
> arch/cris/mm/fault.c | 2 ++
> arch/frv/mm/fault.c | 2 ++
> arch/ia64/mm/fault.c | 2 ++
> arch/m32r/mm/fault.c | 2 ++
> arch/m68k/mm/fault.c | 2 ++
> arch/metag/mm/fault.c | 2 ++
> arch/microblaze/mm/fault.c | 2 ++
> arch/mips/mm/fault.c | 2 ++
> arch/mn10300/mm/fault.c | 2 ++
> arch/openrisc/mm/fault.c | 2 ++
> arch/parisc/mm/fault.c | 2 ++
> arch/powerpc/mm/fault.c | 2 ++
> arch/powerpc/platforms/cell/spu_fault.c | 2 +-
> arch/s390/mm/fault.c | 6 ++++++
> arch/score/mm/fault.c | 2 ++
> arch/sh/mm/fault.c | 2 ++
> arch/sparc/mm/fault_32.c | 2 ++
> arch/sparc/mm/fault_64.c | 2 ++
> arch/tile/mm/fault.c | 2 ++
> arch/um/kernel/trap.c | 2 ++
> arch/x86/mm/fault.c | 10 +++-------
> arch/xtensa/mm/fault.c | 2 ++
> include/linux/mm.h | 5 +++--
> mm/ksm.c | 2 +-
> mm/memory.c | 7 ++++---
> 28 files changed, 62 insertions(+), 14 deletions(-)
>
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