Date: Tue, 14 Oct 2025 18:53:41 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 290235] bsdinstall: swap/dump partition too small to store kernel dump Message-ID: <bug-290235-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290235 Bug ID: 290235 Summary: bsdinstall: swap/dump partition too small to store kernel dump Product: Base System Version: 16.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: emaste@freebsd.org bsdinstall sets dumpdev=AUTO if kernel core dumps are enabled, which uses the first available swap device as a kernel dump device. The default swap size has long been set via the algorithm in usr.sbin/bsdinstall/partedit/part_wizard.c (and later applied to usr.sbin/bsdinstall/scripts/zfsboot also): static intmax_t swap_size(intmax_t available) { intmax_t swapsize; unsigned long maxswap; size_t sz; swapsize = MIN(available/20, 4*1024*1024*1024LL); sz = sizeof(maxswap); if (sysctlbyname("vm.swap_maxpages", &maxswap, &sz, NULL, 0) == 0) swapsize = MIN(swapsize, (intmax_t)maxswap * getpagesize()); return (swapsize); } I.e., it is set to 1/20th of the amount of available memory, with a minimum bound of 4GB and a maximum bound of the maximum amount of swap. The 4GB lower bound will apply until the machine has at least 80GB of memory. On my test laptop with 32GB of memory I often experience dump failure due to an insufficient dump partition size. -- You are receiving this mail because: You are the assignee for the bug.home | help
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