btrfs-convert crashes

DISCUSSION Brian Parma 3 participants 3 messages Apr 27, 2011 Btrfs file system

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Brian Parma

author

2011-04-27 05:20 UTC #0 lore raw

I have a 1.5 TB (1,475,720,773,632) partition that I wanted to convert from ext4 to btrfs. It is currently used as / for ubuntu 10.10.

I booted into 11.04 beta2 and tried a 'btrfs-convert /dev/sdc1', but after about 20 minutes it segfaulted.

I performed a:

sck.ext4 -cDfty -C 0 /dev/sdc1

After everything was clean, I downloaded the debugging symbols for btrfs-convert and tried again. Below is the 'bt full' output. I don't have enough free space to copy all the data off, create a fresh btrfs partition, and copy everything back on (I have backups of important stuff). Is there something else I can try to get this to work?

Brian

at: http://pastebin.com/NEwJNzuP

#0 0x00007ffff7444d05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1 0x00007ffff7448ab6 in abort () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#2 0x000000000040502c in btrfs_extend_item (trans=<value optimized out>, root=0x633920, path=<value optimized out>, data_size=27) at ctree.c:2525
slot =<value optimized out>
slot_orig =<value optimized out>
leaf = 0x1955250
nritems = 1
data_end =<value optimized out>
old_data =<value optimized out>
i =<value optimized out>
__PRETTY_FUNCTION__ = "btrfs_extend_item"
#3 0x000000000040e32d in btrfs_insert_inode_ref (trans=0xc9ef10, root=0x633920, name=0xcfa314 "gtfntf.f.svn-base", name_len=17,
inode_objectid=<value optimized out>, ref_objectid=<value optimized out>, index=150) at inode-item.c:135
old_size = 3945
path = 0x1639aa0
key = {objectid = 37361107, type = 12 '\f', offset = 37359706}
ref =<value optimized out>
ptr =<value optimized out>
ret =<value optimized out>
ins_len = 27
__PRETTY_FUNCTION__ = "btrfs_insert_inode_ref"
#4 0x0000000000413fff in dir_iterate_proc (dir=<value optimized out>, entry=<value optimized out>, old=0xcfa30c, offset=<value optimized out>,

    blocksize=<value optimized out>, buf=<value optimized out>, priv_data=0x7fffffffe370) at convert.c:289
        ret =<value optimized out>
        file_type =<value optimized out>
        objectid = 37361107
        dotdot = ".."
        location = {objectid = 37361107, type = 1 '\001', offset = 0}
        dirent = 0xcfa30c
        idata = 0x7fffffffe370
        __PRETTY_FUNCTION__ = "dir_iterate_proc"

#5 0x00007ffff7bbdc13 in ext2fs_process_dir_block () from /lib/x86_64-linux-gnu/libext2fs.so.2
No symbol table info available.
#6 0x00007ffff7bbac02 in ext2fs_block_iterate2 () from /lib/x86_64-linux-gnu/libext2fs.so.2
No symbol table info available.
#7 0x00007ffff7bbdfb8 in ext2fs_dir_iterate2 () from /lib/x86_64-linux-gnu/libext2fs.so.2
No symbol table info available.
#8 0x000000000041689d in create_dir_entries (devname=0x7fffffffe897 "/dev/sdc1", datacsum=1, packing=1, noxattr=0) at convert.c:322
err =<value optimized out>
data = {trans = 0xc9ef10, root = 0x633920, inode = 0x7fffffffe1c0, objectid = 37359706, index_cnt = 150, parent = 37359705, errcode = 0} ret =<value optimized out>
#9 copy_single_inode (devname=0x7fffffffe897 "/dev/sdc1", datacsum=1, packing=1, noxattr=0) at convert.c:1072

        ret =<value optimized out>
        btrfs_inode = {generation = 1, transid = 140737354044640, size = 4994, nbytes = 0, block_group = 0, nlink = 1, uid = 1000, gid = 1000, mode = 16877,
          rdev = 0, flags = 0, sequence = 140737351933932, reserved = {0, 140737354040256, 140733193388033, 0}, atime = {sec = 1303466526, nsec = 0}, ctime = {
            sec = 1296464377, nsec = 0}, mtime = {sec = 1296464377, nsec = 0}, otime = {sec = 0, nsec = 0}}
#10 copy_inodes (devname=0x7fffffffe897 "/dev/sdc1", datacsum=1, packing=1, noxattr=0) at convert.c:1154
        ret =<value optimized out>
        err =<value optimized out>
        ext2_scan = 0xce2300
        ext2_ino = 37359452
        objectid = 37359706
        ext2_inode = {i_mode = 16877, i_uid = 1000, i_size = 16384, i_atime = 1303466526, i_ctime = 1296464377, i_mtime = 1296464377, i_dtime = 0, i_gid = 1000,
          i_links_count = 2, i_blocks = 32, i_flags = 528384, osd1 = {linux1 = {l_i_version = 1981}, hurd1 = {h_i_translator = 1981}}, i_block = {193290, 4, 0,
            0, 1, 149430439, 1, 3, 149430464, 0, 0, 0, 0, 0, 0}, i_generation = 2854948622, i_file_acl = 0, i_dir_acl = 0, i_faddr = 0, osd2 = {linux2 = {
              l_i_blocks_hi = 0, l_i_file_acl_high = 0, l_i_uid_high = 0, l_i_gid_high = 0, l_i_reserved2 = 0}, hurd2 = {h_i_frag = 0 '\000',
              h_i_fsize = 0 '\000', h_i_mode_high = 0, h_i_uid_high = 0, h_i_gid_high = 0, h_i_author = 0}}}
        trans = 0xc9ef10
#11 do_convert (devname=0x7fffffffe897 "/dev/sdc1", datacsum=1, packing=1, noxattr=0) at convert.c:2411
        i =<value optimized out>
        fd = 6
        ret =<value optimized out>
        blocksize = 4096
        blocks = {9258, 9259, 9260, 9261, 9284, 9285, 9286}
        total_bytes =<value optimized out>
        super_bytenr = 37920768
        ext2_fs = 0x622010
        root = 0x633920
        ext2_root =<value optimized out>

#12 0x0000000000418333 in main (argc=<value optimized out>, argv=<value optimized out>) at convert.c:2867
ret =<value optimized out>
packing = 1
noxattr = 0
datacsum = 1
rollback = 0
file = 0x7fffffffe897 "/dev/sdc1"

Yan, Zheng

2011-04-27 12:05 UTC #1 lore raw

Quoted 1 line · Brian Parma

I have a 1.5 TB (1,475,720,773,632) partition that I wanted to conver=

t from

Quoted 3 lines

ext4 to btrfs. =C2=A0It is currently used as / for ubuntu 10.10.
I booted into 11.04 beta2 and tried a 'btrfs-convert /dev/sdc1', but =

after

Quoted 9 lines

about 20 minutes it segfaulted.
I performed a:
sck.ext4 -cDfty -C 0 /dev/sdc1
After everything was clean, I downloaded the debugging symbols for btrfs-convert and tried again. =C2=A0Below is the 'bt full' output. =C2=

=A0I don't have

Quoted 1 line

enough free space to copy all the data off, create a fresh btrfs part=

ition,

Quoted 1 line

and copy everything back on (I have backups of important stuff). =C2=A0=

Is there

Quoted 4 lines

something else I can try to get this to work?
Brian

The crash was caused by the hard links per directory limit in btrfs. In short, your ext4 is not convertible.

Quoted 4 lines

at: http://pastebin.com/NEwJNzuP
#0 =C2=A00x00007ffff7444d05 in raise () from /lib/x86_64-linux-gnu/li=

bc.so.6

Quoted 2 lines

No symbol table info available.
#1 =C2=A00x00007ffff7448ab6 in abort () from /lib/x86_64-linux-gnu/li=

bc.so.6

Quoted 2 lines

No symbol table info available.
#2 =C2=A00x000000000040502c in btrfs_extend_item (trans=3D<value opti=

mized out>,

Quoted 1 line

root=3D0x633920, path=3D<value optimized out>, data_size=3D27) at ctr=

ee.c:2525

Quoted 8 lines

=C2=A0 =C2=A0 =C2=A0 =C2=A0slot =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0slot_orig =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0leaf =3D 0x1955250
=C2=A0 =C2=A0 =C2=A0 =C2=A0nritems =3D 1
=C2=A0 =C2=A0 =C2=A0 =C2=A0data_end =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0old_data =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0i =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0__PRETTY_FUNCTION__ =3D "btrfs_extend_item=

Quoted 1 line

#3 =C2=A00x000000000040e32d in btrfs_insert_inode_ref (trans=3D0xc9ef=

10,

Quoted 2 lines

root=3D0x633920, name=3D0xcfa314 "gtfntf.f.svn-base", name_len=3D17, =C2=A0 =C2=A0inode_objectid=3D<value optimized out>, ref_objectid=3D<=

value optimized out>,

Quoted 4 lines

index=3D150) at inode-item.c:135
=C2=A0 =C2=A0 =C2=A0 =C2=A0old_size =3D 3945
=C2=A0 =C2=A0 =C2=A0 =C2=A0path =3D 0x1639aa0
=C2=A0 =C2=A0 =C2=A0 =C2=A0key =3D {objectid =3D 37361107, type =3D 1=

2 'f', offset =3D 37359706}

Quoted 5 lines

=C2=A0 =C2=A0 =C2=A0 =C2=A0ref =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0ptr =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0ins_len =3D 27
=C2=A0 =C2=A0 =C2=A0 =C2=A0__PRETTY_FUNCTION__ =3D "btrfs_insert_inod=

e_ref"

Quoted 1 line

#4 =C2=A00x0000000000413fff in dir_iterate_proc (dir=3D<value optimiz=

ed out>,

Quoted 1 line

entry=3D<value optimized out>, old=3D0xcfa30c, offset=3D<value optimi=

zed out>,

Quoted 1 line

=C2=A0 =C2=A0blocksize=3D<value optimized out>, buf=3D<value optimize=

d out>,

Quoted 6 lines

priv_data=3D0x7fffffffe370) at convert.c:289
=C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0file_type =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0objectid =3D 37361107
=C2=A0 =C2=A0 =C2=A0 =C2=A0dotdot =3D ".."
=C2=A0 =C2=A0 =C2=A0 =C2=A0location =3D {objectid =3D 37361107, type =

=3D 1 '=01', offset =3D 0}

Quoted 5 lines

=C2=A0 =C2=A0 =C2=A0 =C2=A0dirent =3D 0xcfa30c
=C2=A0 =C2=A0 =C2=A0 =C2=A0idata =3D 0x7fffffffe370
=C2=A0 =C2=A0 =C2=A0 =C2=A0__PRETTY_FUNCTION__ =3D "dir_iterate_proc" #5 =C2=A00x00007ffff7bbdc13 in ext2fs_process_dir_block () from /lib/x86_64-linux-gnu/libext2fs.so.2

Quoted 8 lines

No symbol table info available.
#6 =C2=A00x00007ffff7bbac02 in ext2fs_block_iterate2 () from /lib/x86_64-linux-gnu/libext2fs.so.2
No symbol table info available.
#7 =C2=A00x00007ffff7bbdfb8 in ext2fs_dir_iterate2 () from /lib/x86_64-linux-gnu/libext2fs.so.2
No symbol table info available.
#8 =C2=A00x000000000041689d in create_dir_entries (devname=3D0x7fffff=

ffe897

Quoted 3 lines

"/dev/sdc1", datacsum=3D1, packing=3D1, noxattr=3D0) at convert.c:322 =C2=A0 =C2=A0 =C2=A0 =C2=A0err =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0data =3D {trans =3D 0xc9ef10, root =3D 0x6=

33920, inode =3D 0x7fffffffe1c0,

Quoted 1 line

objectid =3D 37359706, index_cnt =3D 150, parent =3D 37359705, errcod=

e =3D 0}

Quoted 2 lines

=C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out>
#9 =C2=A0copy_single_inode (devname=3D0x7fffffffe897 "/dev/sdc1", dat=

acsum=3D1,

Quoted 3 lines

packing=3D1, noxattr=3D0) at convert.c:1072
=C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0btrfs_inode =3D {generation =3D 1, transid=

=3D 140737354044640, size =3D

Quoted 1 line

4994, nbytes =3D 0, block_group =3D 0, nlink =3D 1, uid =3D 1000, gid=

=3D 1000, mode =3D

Quoted 2 lines

16877,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0rdev =3D 0, flags =3D 0, sequence =3D=

140737351933932, reserved =3D {0,

Quoted 1 line

140737354040256, 140733193388033, 0}, atime =3D {sec =3D 1303466526, =

nsec =3D 0},

Quoted 2 lines

ctime =3D {
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0sec =3D 1296464377, nsec =3D=

0}, mtime =3D {sec =3D 1296464377, nsec =3D

Quoted 2 lines

0}, otime =3D {sec =3D 0, nsec =3D 0}}
#10 copy_inodes (devname=3D0x7fffffffe897 "/dev/sdc1", datacsum=3D1, =

packing=3D1,

Quoted 7 lines

noxattr=3D0) at convert.c:1154
=C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0err =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0ext2_scan =3D 0xce2300
=C2=A0 =C2=A0 =C2=A0 =C2=A0ext2_ino =3D 37359452
=C2=A0 =C2=A0 =C2=A0 =C2=A0objectid =3D 37359706
=C2=A0 =C2=A0 =C2=A0 =C2=A0ext2_inode =3D {i_mode =3D 16877, i_uid =3D=

1000, i_size =3D 16384, i_atime =3D

Quoted 1 line

1303466526, i_ctime =3D 1296464377, i_mtime =3D 1296464377, i_dtime =3D=

0, i_gid =3D

Quoted 2 lines

1000,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0i_links_count =3D 2, i_blocks =3D 3=

2, i_flags =3D 528384, osd1 =3D {linux1

Quoted 1 line

=3D {l_i_version =3D 1981}, hurd1 =3D {h_i_translator =3D 1981}}, i_b=

lock =3D {193290,

Quoted 2 lines

4, 0,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A00, 1, 149430439, 1, 3, 14943=

0464, 0, 0, 0, 0, 0, 0}, i_generation

Quoted 1 line

=3D 2854948622, i_file_acl =3D 0, i_dir_acl =3D 0, i_faddr =3D 0, osd=

2 =3D {linux2 =3D {

Quoted 1 line

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0l_i_blocks_hi =3D 0, =

l_i_file_acl_high =3D 0, l_i_uid_high =3D 0,

Quoted 1 line

l_i_gid_high =3D 0, l_i_reserved2 =3D 0}, hurd2 =3D {h_i_frag =3D 0 '=

=EF=BF=BD',

Quoted 1 line

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0h_i_fsize =3D 0 '=EF=BF=

=BD', h_i_mode_high =3D 0, h_i_uid_high =3D 0,

Quoted 3 lines

h_i_gid_high =3D 0, h_i_author =3D 0}}}
=C2=A0 =C2=A0 =C2=A0 =C2=A0trans =3D 0xc9ef10
#11 do_convert (devname=3D0x7fffffffe897 "/dev/sdc1", datacsum=3D1, p=

acking=3D1,

Quoted 6 lines

noxattr=3D0) at convert.c:2411
=C2=A0 =C2=A0 =C2=A0 =C2=A0i =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0fd =3D 6
=C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0blocksize =3D 4096
=C2=A0 =C2=A0 =C2=A0 =C2=A0blocks =3D {9258, 9259, 9260, 9261, 9284, =

9285, 9286}

Quoted 6 lines

=C2=A0 =C2=A0 =C2=A0 =C2=A0total_bytes =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0super_bytenr =3D 37920768
=C2=A0 =C2=A0 =C2=A0 =C2=A0ext2_fs =3D 0x622010
=C2=A0 =C2=A0 =C2=A0 =C2=A0root =3D 0x633920
=C2=A0 =C2=A0 =C2=A0 =C2=A0ext2_root =3D<value optimized out> #12 0x0000000000418333 in main (argc=3D<value optimized out>, argv=3D=

<value

Quoted 10 lines

optimized out>) at convert.c:2867
=C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D<value optimized out> =C2=A0 =C2=A0 =C2=A0 =C2=A0packing =3D 1
=C2=A0 =C2=A0 =C2=A0 =C2=A0noxattr =3D 0
=C2=A0 =C2=A0 =C2=A0 =C2=A0datacsum =3D 1
=C2=A0 =C2=A0 =C2=A0 =C2=A0rollback =3D 0
=C2=A0 =C2=A0 =C2=A0 =C2=A0file =3D 0x7fffffffe897 "/dev/sdc1"

Quoted 2 lines

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Quoted 2 lines

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Peter Stuge

2011-04-27 23:36 UTC #2 lore raw

Quoted 4 lines · Zheng

Quoted 1 line
'btrfs-convert /dev/sdc1' .. segfaulted.
The crash was caused by the hard links per directory limit in btrfs. In short, your ext4 is not convertible.

The failure mode is of course unacceptable. Does btrfs-convert have a dry-run mode which could be used to check that actual convert will not crash on top of a pile of random bits?

//Peter