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Date:   Wed, 27 Apr 2022 20:00:02 -0700
From:   Marc MERLIN <marc@merlins.org>
To:     Josef Bacik <josef@toxicpanda.com>
Cc:     linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Rebuilding 24TB Raid5 array (was btrfs corruption: parent
 transid verify failed + open_ctree failed)
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On Wed, Apr 27, 2022 at 08:44:01PM -0400, Josef Bacik wrote:
> Ok it should work now.  Thanks,

Mmmh, it got worse, unfortunately

(gdb) run rescue init-extent-tree /dev/mapper/dshelf1 
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 0x55555564cbc0
JOSEF: root 9
Couldn't find the last root for 8
FS_INFO AFTER IS 0x55555564cbc0
Walking all our trees and pinning down the currently accessible blocks
Clearing the extent root and re-init'ing the block groups

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff78e1f46 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff78e1f46 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x0000555555585950 in memmove (__len=<optimized out>, __src=<optimized out>, __dest=<optimized out>)
    at /usr/include/x86_64-linux-gnu/bits/string_fortified.h:36
#2  memmove_extent_buffer (dst=dst@entry=0x555555b57f60, dst_offset=<optimized out>, src_offset=<optimized out>, len=<optimized out>)
    at kernel-shared/extent_io.c:1021
#3  0x000055555557753b in btrfs_del_items (trans=trans@entry=0x555558a8d460, root=root@entry=0x55555564cde0, 
    path=path@entry=0x7fffffffdc50, slot=slot@entry=36, nr=nr@entry=1) at ./kernel-shared/ctree.h:2387
#4  0x00005555555e0627 in clear_space_cache (block_group=<optimized out>, trans=0x555558a8d460) at cmds/rescue-init-extent-tree.c:116
#5  reset_block_groups (trans=0x555558a8d460) at cmds/rescue-init-extent-tree.c:307
#6  reinit_extent_tree (fs_info=0x7fffffffdc50) at cmds/rescue-init-extent-tree.c:451
#7  btrfs_init_extent_tree (path=path@entry=0x7fffffffe1cd "/dev/mapper/dshelf1") at cmds/rescue-init-extent-tree.c:922
#8  0x00005555555d7a43 in cmd_rescue_init_extent_tree (cmd=<optimized out>, argc=<optimized out>, argv=<optimized out>)
    at cmds/rescue.c:65
#9  0x000055555556c17b in cmd_execute (argv=0x7fffffffdeb8, argc=2, cmd=0x555555642d40 <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=0x555555643cc0 <cmd_struct_rescue>) at cmds/commands.h:125
#12 main (argc=3, argv=0x7fffffffdeb0) at btrfs.c:405

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