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=249067 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. Modern allocators often allocate very large regions of VA e.g. with 1GiB-100GiB mmaps rather than making repeated calls to mmap. When such processes dump core 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), but we believe it effects everyone. -- You are receiving this mail because: You are the assignee for the bug.help
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