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Sorry, I perhaps didn't said clearly. As I knwon, if we remove vma from vma tree of task, the SIGSEGV must be got! but I am not removed them , I just unmapped them. and the SIGSEGV occurs some times, not alway. I doublt on it. Any clearly idea? many thanks. > liyu@WAN wrote: > >> It seem that code in other place jump here to enter kernel. this >> is in a anonymous >> code area. >> At first time, I think this SIGSEGV will trigger by anonymous code >> that is swapped, >> but I wrote one specical condition check to filte out this sort of >> code, IOW, I do >> not swap out it. but I still get SIGSEGV. >> >> May be, we can not be release the vma that include code? or, Is >> there have some errors >> in my words for page fault? >> > > That's right, you cannot release the VMA if the application still > expects to use memory in that area. The page fault handler will > see that no VMA exists in that region and raise a SIGSEGV. > > See arch/i386/mm/fault.c:do_page_fault > > > Nick > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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