Hello!
I also hit the Btrfs read-only after btrfs-convert bug when converting my
Ext4 root filesystem with btrfs-convert. I used the btrfs tools v4.0 and
Linux kernel 4.1.1.
As a workaround I mounted the converted Btrfs read-only and copied it to a
new Btrfs created by mkfs.btrfs (from the btrfs tools v4.0). Debian 8
system booted without problems, and the bug hasn't been seen (so far).
Output of uname, btrfs, and the dmesg log is attached. Let me know if you
need anything else. The old Btrfs is still on another disk, and I can
extract information from it.
Best regards,
René.
--
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Linux nephtys 4.1.1 #1 SMP Thu Jul 2 03:28:56 CEST 2015 x86_64 GNU/Linux
btrfs-progs v4.0
btrfs-progs v4.0
Data, single: total=450.00GiB, used=237.20GiB
System, single: total=32.00MiB, used=48.00KiB
Metadata, single: total=188.00GiB, used=96.78GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
[0.00] Initializing cgroup subsys cpuset
[0.00] Initializing cgroup subsys cpu
[0.00] Initializing cgroup subsys cpuacct
[0.00] Linux version 4.1.1 (lynx@nephtys) (gcc version 4.9.2 (Debian
4.9.2-10) ) #1 SMP Thu Jul 2 03:28:56 CEST 2015
[0.00] Command line: BOOT_IMAGE=/vmlinuz-4.1.1
root=UUID=703fc8b4-b2b9-470b-af2f-9aae9536c2fb ro nordrand rd.auto rd.auto=1
[0.00] e820: BIOS-provided physical RAM map:
[0.00] BIOS-e820: [mem 0x-0x0009cfff] usable
[0.00] BIOS-e820: [mem 0x0009d000-0x0009] reserved
[0.00] BIOS-e820: [mem 0x000e-0x000f] reserved
[0.00] BIOS-e820: [mem 0x0010-0xcfcdcfff] usable
[0.00] BIOS-e820: [mem 0xcfcdd000-0xdce3efff] reserved
[0.00] BIOS-e820: [mem 0xdce3f000-0xdcf7efff] ACPI NVS
[0.00] BIOS-e820: [mem 0xdcf7f000-0xdcffefff] ACPI data
[0.00] BIOS-e820: [mem 0xdcfff000-0xdf9f] reserved
[0.00] BIOS-e820: [mem 0xf800-0xfbff] reserved
[0.00] BIOS-e820: [mem 0xfec0-0xfec00fff] reserved
[0.00] BIOS-e820: [mem 0xfed08000-0xfed08fff] reserved
[0.00] BIOS-e820: [mem 0xfed1-0xfed19fff] reserved
[0.00] BIOS-e820: [mem 0xfed1c000-0xfed1] reserved
[0.00] BIOS-e820: [mem 0xfee0-0xfee00fff] reserved
[0.00] BIOS-e820: [mem 0xff00-0xff000fff] reserved
[0.00] BIOS-e820: [mem 0xffc0-0x] reserved
[0.00] BIOS-e820: [mem 0x0001-0x00031e5f] usable
[0.00] NX (Execute Disable) protection: active
[0.00] SMBIOS 2.7 present.
[0.00] DMI: LENOVO 20C6003AGE/20C6003AGE, BIOS J9ET91WW (2.11 )
07/04/2014
[0.00] e820: update [mem 0x-0x0fff] usable == reserved
[0.00] e820: remove [mem 0x000a-0x000f] usable
[0.00] e820: last_pfn = 0x31e600 max_arch_pfn = 0x4
[0.00] MTRR default type: write-back
[0.00] MTRR fixed ranges enabled:
[0.00] 0-9 write-back
[0.00] A-B uncachable
[0.00] C-F write-protect
[0.00] MTRR variable ranges enabled:
[0.00] 0 base 00E000 mask 7FE000 uncachable
[0.00] 1 base 00DE00 mask 7FFE00 uncachable
[0.00] 2 base 00DD00 mask 7FFF00 uncachable
[0.00] 3 disabled
[0.00] 4 disabled
[0.00] 5 disabled
[0.00] 6 disabled
[0.00] 7 disabled
[0.00] 8 disabled
[0.00] 9 disabled
[0.00] PAT configuration [0-7]: WB WC UC- UC WB WC UC- UC
[0.00] e820: last_pfn = 0xcfcdd max_arch_pfn = 0x4
[0.00] Scanning 1 areas for low memory corruption
[0.00] Base memory trampoline at [88097000] 97000 size 24576
[0.00] Using GB pages for direct mapping
[0.00] init_memory_mapping: [mem 0x-0x000f]
[0.00] [mem 0x-0x000f] page 4k
[0.00] BRK [0x2d7cd000, 0x2d7cdfff] PGTABLE
[0.00] BRK [0x2d7ce000, 0x2d7cefff] PGTABLE
[0.00] BRK [0x2d7cf000, 0x2d7c] PGTABLE
[0.00] init_memory_mapping: [mem 0x31e40-0x31e5f]
[0.00] [mem 0x31e40-0x31e5f] page 2M
[0.00] BRK [0x2d7d, 0x2d7d0fff] PGTABLE
[0.00] init_memory_mapping: [mem 0x3-0x31e3f]
[0.00] [mem 0x3-0x31e3f] page 2M
[0.00] init_memory_mapping: [mem 0x2e000-0x2]
[0.00] [mem
