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NEURAL_HAM_LONG(-1.00)[-1.000]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector10001:i=1]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; DMARC_POLICY_ALLOW(-0.50)[cs.utah.edu,none]; R_DKIM_ALLOW(-0.20)[utah.edu:s=UniversityOfUtah,UofUtah.onmicrosoft.com:s=selector2-UofUtah-onmicrosoft-com]; R_SPF_ALLOW(-0.20)[+ip4:155.97.144.0/24]; MIME_GOOD(-0.10)[text/plain]; MISSING_XM_UA(0.00)[]; DKIM_TRACE(0.00)[utah.edu:+,UofUtah.onmicrosoft.com:+]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[40.93.13.66:received]; ASN(0.00)[asn:17055, ipnet:155.97.0.0/16, country:US]; MLMMJ_DEST(0.00)[freebsd-virtualization@freebsd.org,virtualization@freebsd.org]; RCVD_TLS_LAST(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_COUNT_SEVEN(0.00)[7] X-Rspamd-Queue-Id: 4dbKtn03Ylz3MyB I didn't manage to track it down myself, but others have found the cause and a workaround, which you can follow at this ticket: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291768 On Tue, Dec 16, 2025 at 05:44:18PM +0100, Evilham wrote: > > Hey, > > On dg., des. 14 2025, Robert Ricci wrote: > > > I've run into what appears to be a regression in vmm/bhyve in > > FreeBSD 15, and could use some help tracking it down. > > > > I upgraded my AMD Zen 4 machine (via source) from stable/14 > > (sometime post-14.3) to stable/15 (currently running -stable > > from today). I had some VMs (Linux guests of various flavors) > > that were running fine before the update. After the update, they > > won't start. > > > > The behavior is: the bootloader seems to work fine (eg. I can > > run grub-bhyve, it runs to completion and exits). However once I > > start bhyve itself, it just burns up a CPU (note: just one, no > > matter how many vCPUs) - I get nothing on serial console, > > nothing on the fbuf if I enable it. > > I think I'm seeing this as well, did you manage to solve it? > > For me it doesn't matter whether I use uefi or grub bootlaoders. > > Here is my (suboptimal) temporary workaround: > > - start a tmux > - run vm start -f VM-name on each tmux tab (somehow this works) > > I also tried with vm-bhyve-devel-1.7.0_1 and have the same > symptoms you mentioned. > > Cheers, > -- > Evilham