Date: Mon, 30 Jun 2025 03:19:39 +0000 From: bugzilla-noreply@freebsd.org To: sysinstall@FreeBSD.org Subject: [Bug 287904] Most recent installer fails to flush pre-existing GPT labels Message-ID: <bug-287904-8135-zD8xz6sIDD@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-287904-8135@https.bugs.freebsd.org/bugzilla/> References: <bug-287904-8135@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287904 --- Comment #4 from Dennis Clarke <dclarke@blastwave.org> --- Starting over and over and over again wherein I drop to a single user shell from the installer disk1.iso image ( FreeBSD 14.3-RELEASE ) and then manually use dd to wipe out the GPG labels at the beginning of the disk and ALSO the backup labels at the end of the disk : # # gpart show -l /dev/ada0 => 40 488390552 ada0 GPT (233G) 40 532480 1 efiboot0 (260M) 532520 1024 2 gptboot0 (512K) 533544 984 - free - (492K) 534528 33554432 3 swap0 (16G) 34088960 454299648 4 zfs0 (217G) 488388608 1984 - free - (992K) # gpart show -l /dev/ada1 => 40 488390552 ada1 GPT (233G) 40 532480 1 efiboot1 (260M) 532520 1024 2 gptboot1 (512K) 533544 984 - free - (492K) 534528 33554432 3 swap1 (16G) 34088960 454299648 4 zfs1 (217G) 488388608 1984 - free - (992K) # gpart destroy -F /dev/ada0 ada0 destroyed # gpart destroy -F /dev/ada1 ada1 destroyed # Now nuke the beginning of the disks : # # dd if=/dev/zero of=/dev/ada0 bs=65536 count=8192 status=progress 506527744 bytes (507 MB, 483 MiB) transferred 6.063s, 84 MB/s 8192+0 records in 8192+0 records out 536870912 bytes transferred in 6.477946 secs (82876725 bytes/sec) # dd if=/dev/zero of=/dev/ada1 bs=65536 count=8192 status=progress 506396672 bytes (506 MB, 483 MiB) transferred 6.063s, 84 MB/s 8192+0 records in 8192+0 records out 536870912 bytes transferred in 6.478905 secs (82864448 bytes/sec) # # dmesg | grep 'ada0' ada0 at ahcich0 bus 0 scbus0 target 0 lun 0 ada0: <SEAGATE ST32500NSSUN250G 0745B68PY6 3AZQ> ATA-7 SATA 2.x device ada0: Serial Number 9QE68PY6 ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada0: Command Queueing enabled ada0: 238471MB (488390625 512 byte sectors) ses0: ada0,pass0 in 'Slot 00', SATA Slot: scbus0 target 0 # Note the number 488390625 of sectors on the disk. GPART tells me 488390552 with a 40 block offset. Thankfully these are older and ( sort of ) smaller disks. So the trick is to read what dmesg says the real physical size of the disk is and then compute a pile of blocks backwards from the end and nuke them. $ echo '8k 488390625 65536 - pq' | dc 488325089 # dd if=/dev/zero of=/dev/ada0 bs=512 oseek=488325089 count=65536 status=progress 30327296 bytes (30 MB, 29 MiB) transferred 7.063s, 4294 kB/s 65536+0 records in 65536+0 records out 33554432 bytes transferred in 7.857187 secs (4270540 bytes/sec) # dd if=/dev/zero of=/dev/ada1 bs=512 oseek=488325089 count=65536 status=progress 30386688 bytes (30 MB, 29 MiB) transferred 7.063s, 4302 kB/s 65536+0 records in 65536+0 records out 33554432 bytes transferred in 7.838621 secs (4280655 bytes/sec) # This was verified with a test and we see end of media hit if we add even a single 512 byte block : # # dd if=/dev/zero of=/dev/ada0 bs=512 oseek=488325089 count=65537 status=progress dd: /dev/ada0: end of deviceMiB) transferred 7.063s, 4291 kB/s 65537+0 records in 65536+0 records out 33554432 bytes transferred in 7.823743 secs (4288795 bytes/sec) # At this point I believe that the GPT data has been wiped off the disks. Once again perform the usual install process with the installer and then drop to a shell at the end to inspect the wreckage : This shell is operating in a chroot in the new system. When finished making configuration changes, type "exit". root@triton:/ # root@triton:/ # cat /etc/fstab # Device Mountpoint FStype Options Dump Pass# /dev/gpt/efiboot0 /boot/efi msdosfs rw 2 2 /dev/mirror/swap none swap sw 0 0 root@triton:/ # root@triton:/ # root@triton:/ # gpart show -l /dev/ada0 => 40 488390552 ada0 GPT (233G) 40 532480 1 efiboot0 (260M) 532520 1024 2 gptboot0 (512K) 533544 984 - free - (492K) 534528 33554432 3 swap0 (16G) 34088960 454299648 4 zfs0 (217G) 488388608 1984 - free - (992K) root@triton:/ # gpart show -l /dev/ada1 => 40 488390552 ada1 GPT (233G) 40 532480 1 efiboot1 (260M) 532520 1024 2 gptboot1 (512K) 533544 984 - free - (492K) 534528 33554432 3 swap1 (16G) 34088960 454299648 4 zfs1 (217G) 488388608 1984 - free - (992K) root@triton:/ # The only geom mirror that exists is swap : root@triton:/ # kldload geom_mirror GEOM_MIRROR: Device mirror/swap launched (2/2). root@triton:/ # gmirror status Name Status Components mirror/swap COMPLETE ada1p3 (ACTIVE) ada0p3 (ACTIVE) root@triton:/ # However we do have something under /dev/gpt : root@triton:/ # ls /dev/gpt/ efiboot0 efiboot1 gptboot0 gptboot1 root@triton:/ # Now I exit from the chroot shell session and reboot : ┌───────────────┤Complete├────────────────┐ │ Installation of FreeBSD complete! Would │ │ you like to reboot into the installed │ │ system now? │ ├─────────────────────────────────────────┤ │[ Reboot ] [ Shutdown ] [Live System]│ └─────────────────────────────────────────┘ Loading kernel... /boot/kernel/kernel text=0x180078 text=0xd97948 text=0x43a46b data=0x180+0xe80 data=0x187590+0x478a70 0x8+0x18e940+0x8+0x1b2b03| Loading configured modules... can't find '/etc/hostid' /boot/kernel/zfs.ko size 0x5e9340 at 0x2142000 /boot/kernel/cryptodev.ko size 0x7808 at 0x272c000 /boot/kernel/geom_mirror.ko size 0x21350 at 0x2734000 /boot/entropy size=0x1000 staging 0x44800000 (not copying) tramp 0x4475b000 PT4 0x44752000 Start @ 0xffffffff80381000 ... EFI framebuffer information: addr, size 0xe0000000, 0x258000 dimensions 800 x 600 stride 1024 masks 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000 ---<<BOOT>>--- Copyright (c) 1992-2023 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 14.3-RELEASE releng/14.3-n271432-8c9ce319fef7 GENERIC amd64 FreeBSD clang version 19.1.7 (https://github.com/llvm/llvm-project.git llvmorg-19.1.7-0-gcd708029e0b2) . . . uart0: console (38400,n,8,1) atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0 atkbd0: <AT Keyboard> irq 1 on atkbdc0 kbd0 at atkbd0 . . . ZFS filesystem version: 5 ZFS storage pool version: features support (5000) hdacc0: <Realtek ALC662 rev3 HDA CODEC> at cad 0 on hdac0 hdaa0: <Realtek ALC662 rev3 Audio Function Group> at nid 1 on hdacc0 pcm0: <Realtek ALC662 rev3 (Analog 2.0+HP/2.0)> at nid 20,27 and 24,26 on hdaa0 pcm1: <Realtek ALC662 rev3 (Analog)> at nid 21 and 25 on hdaa0 hdacc1: <NVIDIA (0x0060) HDA CODEC> at cad 0 on hdac1 hdaa1: <NVIDIA (0x0060) Audio Function Group> at nid 1 on hdacc1 pcm2: <NVIDIA (0x0060) (HDMI/DP 8ch)> at nid 4 on hdaa1 pcm3: <NVIDIA (0x0060) (HDMI/DP 8ch)> at nid 5 on hdaa1 Trying to mount root from zfs:zroot/ROOT/default []... . . . ada0 at ahcich0 bus 0 scbus0 target 0 lun 0 ada0: <SEAGATE ST32500NSSUN250G 0745B68PY6 3AZQ> ATA-7 SATA 2.x device ada0: Serial Number 9QE68PY6 ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada0: Command Queueing enabled ada0: 238471MB (488390625 512 byte sectors) ada1 at ahcich1 bus 0 scbus1 target 0 lun 0 ada1: <SEAGATE ST32500NSSUN250G 0744B64QYY 3AZQ> ATA-7 SATA 2.x device ada1: Serial Number 9QE64QYY ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) ada1: Command Queueing enabled ada1: 238471MB (488390625 512 byte sectors) . . . GEOM_MIRROR: Device mirror/swap launched (2/2). . . . Starting file system checks: /dev/gpt/efiboot0: FILESYSTEM CLEAN; SKIPPING CHECKS Mounting local filesystems:. . . . Boot completes normally. There is no mention of anything like an EFI geom mirror for the DOS partitions. Perhaps they are never mirrored? This is the first time I have seen this work. Clearly the installer script is not clearing out the GPT label data from the disks involved. -- You are receiving this mail because: You are the assignee for the bug.help
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