Date: Thu, 11 Dec 2025 15:43:59 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 291577] 15.0-RELEASE install panic on Hyper-V Generation 2 Virtual Machine (2+ vCPUs) Message-ID: <bug-291577-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291577 Bug ID: 291577 Summary: 15.0-RELEASE install panic on Hyper-V Generation 2 Virtual Machine (2+ vCPUs) Product: Base System Version: 15.0-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: nickcph@gmail.com When installing FreeBSD 15.0-RELEASE using FreeBSD-15.0-RELEASE-amd64-bootonly.iso into a Hyper-V Generation 2 Virtual Machine, installer panics if the VM has been set to use 2 or more Virtual CPUs (console output below). Reducing the VM settings to 1 vCPU allows the install to complete successfully, but increasing vCPUs after installation/shutdown also results in panic upon next boot. Installation and use of same install media into a Hyper-V Generation 1 Virtual Machine is not affected. Host software: Windows 11 Enterprise 24H2 (26100.7462) Host hardware: AMD Ryzen Threadripper 3990X, 64GB RAM processor eflags = interrupt enabled, resume, IOPL = 0 current process = 147 (devctl) rdi: fffff800013d1e00 rsi: ffffffff818b9679 rdx: ffffffff818b9678 rcx: ffffffff818b9678 r8: 000000000000000e r9: 8080808080808080 rax: ffffffff82d121af rbx: fffff800013d1e00 rbp: fffffe00d15b4a90 r10: ffffffff82d120d1 r11: 89ff9b9697899700 r12: 0000000000000000 r13: fffff800014c1200 r14: fffff800015f5640 r15: 0000000088ca6c00 trap number = 1 panic: privileged instruction fault cpuid = 0 time = 1765463565 KDB: stack backtrace: #0 0xffffffff80bbeled at kdb_backtrace+0x5d #1 0xffffffff80b71576 at vpanic+0x136 #2 0xffffffff80b71433 at panic+0x43 #3 0xffffffff81079b98 at trap_fatal+0x68 #4 0xffffffff8104ff18 at calltrap+0x8 #5 0xffffffff80baccd1 at device_probe+0x71 #6 0xffffffff80baf037 at bus_generic_driver_added+0x67 #7 0xffffffff80baa8c9 at devclass_driver_added+0x29 #8 0xffffffff80bb33db at device_do_deferred_actions+0x3b #9 0xffffffff80bb2cef at devct12_ioct1+0x20f #10 0xffffffff809f4eeb at devfs_ioct1+0xcb #11 0xffffffff80c75458 at vn_ioct1+0xc8 #12 0xffffffff809f555e at devfs_ioctl_f+0x1e #13 0xffffffff80be0cb5 at kern_ioct1+0x255 #14 0xffffffff80be0a01 at sys_ioct1+0x101 #15 0xffffffff8107a8a6 at amd64_syscall+0x126 #16 0xffffffff8105080b at fast_syscall_common+0xf8 -- You are receiving this mail because: You are the assignee for the bug.home | help
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