Date: Sat, 31 Mar 2018 15:49:53 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 227116] CURRENT doesn't boot with integer divide fault in uma_startup_count Message-ID: <bug-227116-8-DCcs7S51jt@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-227116-8@https.bugs.freebsd.org/bugzilla/> References: <bug-227116-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227116 --- Comment #11 from Konstantin Belousov <kib@FreeBSD.org> --- (In reply to Konstantin Belousov from comment #8) In fact it is clear where the things get broken: UMA_SLAB_SPACE is UMA_SLAB_SIZE - sizeof(struct uma_slab) == 3984. You have 2 14-core CPUs, hyperthreaded. This gives mp_maxid = 2 * 2 * 14 == 56. Number of vm_domains is 2. Then zsize, according to gdb, is 3984. UMA_BOOT_ALIGN is 32, and roundup2(zsize, UMA_BOOT_ALIGN) is 4000. So kernel tries to calculate howmany(zones, 3984 / 4000) == howmany(zones, 0). If you look at the definition of howmany, you will see the division by the second arg. -- You are receiving this mail because: You are the assignee for the bug.help
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