Date: Wed, 02 Sep 2020 16:43:51 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 249067] coredumps include whole maps Message-ID: <bug-249067-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D249067 Bug ID: 249067 Summary: coredumps include whole maps Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: brooks@FreeBSD.org FreeBSD coredumps dump whole apps even when most pages haven't been touched= .=20 Modern allocators often allocate very large regions of VA e.g. with 1GiB-10= 0GiB mmaps rather than making repeated calls to mmap. When such processes dump c= ore the whole map gets dumped even though it's nearly all unmapped pages. Linux breaks such maps into a set of PT_LOADs where unbacked anonymous pages aren= 't present in the file. We ran into this on a very slow riscv (100MHz FPGA with very slow disk), bu= t we believe it effects everyone. --=20 You are receiving this mail because: You are the assignee for the bug.=
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