On Sat, Aug 23, 2014 at 01:37:33PM -0400, Zygo Blaxell wrote:
> This came from trying to convert a ~1.8T ext4 filesystem with btrfs-progs
> master (24cf4d8c3ee924b474f68514e0167cc2e602a48d) on Debian. e2fsck -f
> reports no errors on the source filesystem.
>
> I've done several ext4 conversions before this one, so I'm pretty sure
> the tool works most of the time. ;)
>
> Options are:
>
> btrfs-convert -n -d /dev/mapper/testsnap
>
> It segfaults without the -n and -d options too, but takes much longer to
> run get to this point.
>
> (gdb) bt full
> #0 __memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:156
> No locals.
> #1 0x0000000000415c86 in memcpy (__len=<optimized out>, __src=<optimized out>, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:51
> No locals.
> #2 copy_extent_buffer (dst=dst@entry=0x2235210, src=src@entry=0x22330f0, dst_offset=<optimized out>, src_offset=<optimized out>, len=len@entry=18446744073709551563) at extent_io.c:910
> No locals.
> #3 0x00000000004056c4 in copy_for_split (nritems=0, mid=1, slot=0, right=0x2235210, l=0x22330f0, path=0x674ca0, root=0x63dc00, trans=0x11105c0) at ctree.c:1912
> data_copy_size = -53
> i = <optimized out>
> ret = 0
> wret = <optimized out>
> rt_data_off = <optimized out>
> disk_key = {objectid = 6544384, type = 160 '\240', offset = 26444}
> #4 split_leaf (trans=trans@entry=0x11105c0, root=root@entry=0x63dc00, ins_key=ins_key@entry=0x7fffffffde40, path=path@entry=0x674ca0, data_size=data_size@entry=52, extend=extend@entry=1) at ctree.c:2096
> disk_key = {objectid = 0, type = 0 '\000', offset = 0}
> l = 0x22330f0
> nritems = 0
> mid = 1
> slot = 0
> right = 0x2235210
> ret = <optimized out>
> wret = <optimized out>
> split = <optimized out>
> num_doubles = 0
> __PRETTY_FUNCTION__ = "split_leaf"
Somehow @nritems is 0 and @mid is 1, and this leads to data_copy_size to be -53,
and causes the segfault.
But seems I'm not able to run into this here.
thanks,
-liubo
> #5 0x0000000000407283 in btrfs_search_slot (trans=0x11105c0, root=root@entry=0x63dc00, key=key@entry=0x7fffffffde40, p=p@entry=0x674ca0, ins_len=ins_len@entry=52, cow=cow@entry=1) at ctree.c:1120
> sret = <optimized out>
> b = 0x22330f0
> slot = 0
> ret = <optimized out>
> level = <optimized out>
> should_reada = 0
> lowest_level = 0 '\000'
> __PRETTY_FUNCTION__ = "btrfs_search_slot"
> #6 0x0000000000407416 in btrfs_insert_empty_items (trans=trans@entry=0x11105c0, root=root@entry=0x63dc00, path=path@entry=0x674ca0, cpu_key=cpu_key@entry=0x7fffffffde40, data_size=data_size@entry=0x7fffffffde3c, nr=nr@entry=1) at ctree.c:2412
> leaf = <optimized out>
> ret = 0
> slot = <optimized out>
> i = <optimized out>
> nritems = 32767
> total_size = 52
> total_data = <optimized out>
> data_end = <optimized out>
> disk_key = {objectid = 144, type = 240 '\360', offset = 18158513697557980219}
> __PRETTY_FUNCTION__ = "btrfs_insert_empty_items"
> #7 0x0000000000414256 in btrfs_insert_empty_item (data_size=27, key=0x7fffffffde40, path=0x674ca0, root=0x63dc00, trans=0x11105c0) at ctree.h:2305
> No locals.
> #8 btrfs_insert_inode_ref (trans=0x11105c0, root=0x63dc00, name=name@entry=0x16604fc "", name_len=name_len@entry=17, inode_objectid=inode_objectid@entry=96847738, ref_objectid=<optimized out>, index=1915) at inode-item.c:72
> path = 0x674ca0
> key = {objectid = 96847738, type = 12 '\f', offset = 38723926}
> ref = <optimized out>
> ptr = <optimized out>
> ret = <optimized out>
> ins_len = 27
> __PRETTY_FUNCTION__ = "btrfs_insert_inode_ref"
> #9 0x0000000000421d68 in dir_iterate_proc (dir=<optimized out>, entry=<optimized out>, dirent=0x16604f4, offset=<optimized out>, blocksize=<optimized out>, buf=<optimized out>, priv_data=0x7fffffffe3a0) at btrfs-convert.c:290
> ret = <optimized out>
> file_type = 0
> objectid = 96847738
> inode_size = <optimized out>
> dotdot = ".."
> location = {objectid = 96847738, type = 1 '\001', offset = 0}
> idata = 0x7fffffffe3a0
> name_len = 17
> __PRETTY_FUNCTION__ = "dir_iterate_proc"
> #10 0x00007ffff704b6f3 in ext2fs_process_dir_block () from /lib/x86_64-linux-gnu/libext2fs.so.2
> No symbol table info available.
> #11 0x00007ffff7047cfc in ?? () from /lib/x86_64-linux-gnu/libext2fs.so.2
> No symbol table info available.
> #12 0x00007ffff704ba1b in ext2fs_dir_iterate2 () from /lib/x86_64-linux-gnu/libext2fs.so.2
> No symbol table info available.
> #13 0x00000000004248ae in create_dir_entries (ext2_ino=38723672, ext2_fs=0x632010, btrfs_inode=0x7fffffffe430, objectid=38723926, root=0x63dc00, trans=0x11105c0) at btrfs-convert.c:323
> ret = <optimized out>
> err = <optimized out>
> data = {trans = 0x11105c0, root = 0x63dc00, inode = 0x7fffffffe430, objectid = 38723926, index_cnt = 1915, parent = 38723925, errcode = 0}
> #14 copy_single_inode (noxattr=0, packing=0, datacsum=0, ext2_inode=0x7fffffffe320, ext2_ino=38723672, ext2_fs=0x632010, objectid=38723926, root=0x63dc00, trans=0x11105c0) at btrfs-convert.c:985
> ret = <optimized out>
> btrfs_inode = {generation = 1, transid = 18446744073709551492, size = 53920, nbytes = 0, block_group = 0, nlink = 1, uid = 0, gid = 0, mode = 16877, rdev = 0, flags = 0, sequence = 0, reserved = {0, 0, 0, 0}, atime = {sec = 1408667056, nsec = 0}, ctime = {sec = 1408667056, nsec = 0}, mtime = {sec = 1408667056, nsec = 0}, otime = {sec = 0, nsec = 0}}
> #15 copy_inodes (noxattr=0, packing=0, datacsum=0, ext2_fs=0x632010, root=0x63dc00) at btrfs-convert.c:1067
> ret = <optimized out>
> err = <optimized out>
> ext2_scan = 0x63e220
> ext2_ino = 38723672
> objectid = 38723926
> ext2_inode = {i_mode = 16877, i_uid = 0, i_size = 192512, i_atime = 1408667056, i_ctime = 1408667056, i_mtime = 1408667056, i_dtime = 0, i_gid = 0, i_links_count = 2, i_blocks = 376, i_flags = 528384, osd1 = {linux1 = {l_i_version = 4040}, hurd1 = {h_i_translator = 4040}}, i_block = {193290, 4, 0, 0, 16, 157918112, 16, 31, 158255041, 0, 0, 0, 0, 0, 0}, i_generation = 1366646, i_file_acl = 0, i_size_high = 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_checksum_lo = 0, l_i_reserved = 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 = 0x11105c0
> #16 do_convert (noxattr=-7352, packing=0, datacsum=0, devname=0x7fffffffe8ab "/dev/mapper/testsnap") at btrfs-convert.c:2278
> ext2_fs = 0x632010
> root = 0x63dc00
> ret = <optimized out>
> fd = <optimized out>
> blocks = {5277888, 5277889, 5277909, 5277956, 5277957, 5277958, 5277959}
> total_bytes = <optimized out>
> super_bytenr = 21618229248
> ext2_root = 0x0
> i = <optimized out>
> blocksize = 4096
> #17 main (argc=<optimized out>, argv=<optimized out>) at btrfs-convert.c:2745
> ret = 0
> packing = 0
> noxattr = -7352
> datacsum = 0
> rollback = <optimized out>
> file = 0x7fffffffe8ab "/dev/mapper/testsnap"
> (gdb)
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
