Date: Fri, 28 May 2021 19:31:42 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209821 --- Comment #39 from David Sebek <firstname.lastname@example.org> --- There is also another scenario when the system can hang after displaying the EFI framebuffer information. This happens when EFI_STAGING_SIZE is too small (e.g., 32MB) and there is no available memory surrounding the staging area. In that case, efi_check_space correctly returns FALSE. The functions that called it (efi_copyin, efi_readin) also return an error. The return value of efi_readin seems to be checked by all of its callers. However, the return value of efi_copyin is never checked. In a KVM virtual machine with OVMF, FreeBSD boots with no apparent issues even if EFI_STAGING_SIZE is set to 32 and efi_check_space does not expand the allocated memory and returns errors. On my physical machine, with EFI_STAGING_SIZE set to 32, the bootloader prints a bunch of "efi_check_space: Unable to expand staging area" messages followed by the EFI framebuffer information, and then it hangs. Some graphical corruption was also displayed on the screen. -- You are receiving this mail because: You are the assignee for the bug.