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: [email protected]
Reporter: [email protected]
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
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