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Date:   Tue, 5 Apr 2022 14:43:09 -0700
From:   Marc MERLIN <marc@merlins.org>
To:     Josef Bacik <josef@toxicpanda.com>
Cc:     "linux-btrfs@vger.kernel.org" <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 Tue, Apr 05, 2022 at 05:35:02PM -0400, Josef Bacik wrote:
> On Tue, Apr 5, 2022 at 5:26 PM Marc MERLIN <marc@merlins.org> wrote:
> >
> > On Tue, Apr 05, 2022 at 05:19:57PM -0400, Josef Bacik wrote:
> > > Otra vez por favor,
> >
> > (gdb) run -o 1 /dev/mapper/dshelf1a
> > Starting program: /var/local/src/btrfs-progs-josefbacik/btrfs-find-root -o 1 /dev/mapper/dshelf1a
> > [Thread debugging using libthread_db enabled]
> > Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> > parent transid verify failed on 22216704 wanted 1600938 found 1602177
> > parent transid verify failed on 22216704 wanted 1600938 found 1602177
> > parent transid verify failed on 22216704 wanted 1600938 found 1602177
> > FS_INFO IS 0x5555555cf2a0
> > parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
> > parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
> > parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
> > parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
> > parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
> > parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
> > Couldn't find the last root for 4
> > Couldn't setup device tree
> > FS_INFO AFTER IS 0x5555555cf2a0
> > Superblock thinks the generation is 1602089
> > Superblock thinks the level is 1
> >
> > Program received signal SIGSEGV, Segmentation fault.
> 
> Ugh sorry, try again.  Thanks,


Thanks. Note that you still have 2 functions to comment out
>From https://github.com/josefbacik/btrfs-progs
   ce32ea15..914c9847  for-marc   -> origin/for-marc
Updating ce32ea15..914c9847
Fast-forward
 btrfs-find-root.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
sauron:/var/local/src/btrfs-progs-josefbacik# make
    [CC]     btrfs-find-root.o
btrfs-find-root.c:383:13: warning: ‘print_find_root_result’ defined but not used [-Wunused-function]
  383 | static void print_find_root_result(struct cache_tree *result,


New version after I fixed the build warnings that were errors for me
gargamel:/var/local/src/btrfs-progs-josefbacik# ./btrfs-find-root -o 1 /dev/mapper/dshelf1a 2>&1 |tee /tmp/out
parent transid verify failed on 22216704 wanted 1600938 found 1602177
parent transid verify failed on 22216704 wanted 1600938 found 1602177
parent transid verify failed on 22216704 wanted 1600938 found 1602177
FS_INFO IS 0x564897ec32a0
parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
parent transid verify failed on 13577821667328 wanted 1602089 found 1602242
Couldn't find the last root for 4
Couldn't setup device tree
FS_INFO AFTER IS 0x564897ec32a0
Superblock thinks the generation is 1602089
Superblock thinks the level is 1
Found tree root at 13577814573056 gen 1602089 level 1
gargamel:/var/local/src/btrfs-progs-josefbacik# 

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