Re: Rebuilding 24TB Raid5 array (was btrfs corruption: parent transid verify failed + open_ctree failed)

[Marc MERLIN <marc@merlins.org>]

On Sun, Jun 05, 2022 at 03:37:23PM -0400, Josef Bacik wrote:
> On Sat, Jun 4, 2022 at 8:13 PM Marc MERLIN <marc@merlins.org> wrote:
> >
> > On Sat, Jun 04, 2022 at 07:10:16PM -0400, Josef Bacik wrote:
> >
> > > Ok this looks like it worked?  Can you re-run tree-recover to see if
> > > it uses the right bytenr?  Thanks,
> >
> > gargamel:/var/local/src/btrfs-progs-josefbacik# ./btrfs rescue tree-recover /dev/mapper/dshelf1
> 
> Sorry I've been in the mountains with terrible internet.  I'm home
> with a computer and real internet now.  I've pushed more debugging,
> just run the init-extent-tree again, it'll spit out the root info so I
> can see wtf is going on here.  Thanks,

Starting program: /var/local/src/btrfs-progs-josefbacik/btrfs rescue init-extent-tree /dev/mapper/dshelf1
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
FS_INFO IS 0x555555650bc0
Couldn't find the last root for 8
FS_INFO AFTER IS 0x555555650bc0
Walking all our trees and pinning down the currently accessible blocks

Program received signal SIGSEGV, Segmentation fault.
0x000055555557103f in generic_err (buf=buf@entry=0x5555557a3bb0, slot=slot@entry=38, 
    fmt=fmt@entry=0x55555560be80 "bad key order, current (%llu %u %llu) next (%llu %u %llu)") at ./kernel-shared/ctree.h:2135
2135    BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
(gdb) bt
#0  0x000055555557103f in generic_err (buf=buf@entry=0x5555557a3bb0, slot=slot@entry=38, 
    fmt=fmt@entry=0x55555560be80 "bad key order, current (%llu %u %llu) next (%llu %u %llu)") at ./kernel-shared/ctree.h:2135
#1  0x000055555557303e in btrfs_check_node (fs_info=fs_info@entry=0x555555650bc0, parent_key=parent_key@entry=0x0, 
    node=node@entry=0x5555557a3bb0) at kernel-shared/ctree.c:663
#2  0x000055555557c0db in read_tree_block (fs_info=fs_info@entry=0x555555650bc0, bytenr=<optimized out>, 
    parent_transid=parent_transid@entry=0) at kernel-shared/disk-io.c:403
#3  0x000055555559f54e in traverse_tree_blocks (tree=tree@entry=0x555555701690, eb=eb@entry=0x55555579fb30, 
    tree_root=tree_root@entry=0) at common/repair.c:166
#4  0x000055555559f4ca in traverse_tree_blocks (tree=tree@entry=0x555555701690, eb=eb@entry=0x5555557938f0, 
    tree_root=tree_root@entry=1) at common/repair.c:146
#5  0x000055555559f5b5 in traverse_tree_blocks (tree=tree@entry=0x555555701690, eb=0x5555556a2be0, tree_root=tree_root@entry=1)
    at common/repair.c:171
#6  0x000055555559f7e5 in btrfs_mark_used_tree_blocks (fs_info=fs_info@entry=0x555555650bc0, tree=tree@entry=0x555555701690, 
    chunk_only=chunk_only@entry=false) at common/repair.c:189
#7  0x00005555555e11ed in btrfs_init_extent_tree (path=path@entry=0x7fffffffe1ce "/dev/mapper/dshelf1")
    at cmds/rescue-init-extent-tree.c:1211
#8  0x00005555555d7eb4 in cmd_rescue_init_extent_tree (cmd=<optimized out>, argc=<optimized out>, argv=<optimized out>)
    at cmds/rescue.c:139
#9  0x000055555556c17b in cmd_execute (argv=0x7fffffffdeb8, argc=2, cmd=0x555555646c80 <cmd_struct_rescue_init_extent_tree>)
    at cmds/commands.h:125
#10 handle_command_group (cmd=<optimized out>, argc=2, argv=0x7fffffffdeb8) at btrfs.c:152
#11 0x000055555556c275 in cmd_execute (argv=0x7fffffffdeb0, argc=3, cmd=0x555555647cc0 <cmd_struct_rescue>) at cmds/commands.h:125
#12 main (argc=3, argv=0x7fffffffdeb0) at btrfs.c:405

-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
 
Home page: http://marc.merlins.org/                       | PGP 7F55D5F27AAF9D08