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Date:   Sun, 15 May 2022 08:41:23 -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 Sun, May 15, 2022 at 11:35:28AM -0400, Josef Bacik wrote:
> On Sun, May 15, 2022 at 11:33 AM Marc MERLIN <marc@merlins.org> wrote:
> >
> > On Sun, May 15, 2022 at 11:24:34AM -0400, Josef Bacik wrote:
> > > Ok I pushed something new, but completely untested as I'm sitting at a
> > > park with the kids and my kdevops thing is broken on my laptop.  You
> > > should be able to do
> > >
> > > btrfs rescue init-csum-tree <device>
> > >
> > > and it'll rebuild the csum tree.  It'll give you a progress bar as
> > > well.  I expect the normal amount of back and forth before it actually
> > > works, but it should work faster for you.  Thanks,
> >
> > Thanks. Actually I'm past that, I'm doing
> > ./btrfs check --init-csum-tree /dev/mapper/dshelf1
> > that's the one that's been running for days.
> >
> > Are you saying init-csum-tree was moved to rescue which does run faster,
> > and after that I should run the last step, check --repair, that you
> > suggested?
> >
> 
> Yes, I've replaced the rescue --init-csum-tree with rescue
> init-csum-tree, which will repopulate the csum extents.
> 
> So you should cancel what you're doing, and then run
> 
> btrfs rescue init-csum-tree <device>
> btrfs check --repair <device>
> 
> and then you should be good to go.  Thanks,

Gotcha, so let's work through the new version, looks like a recursive loop 

FS_INFO IS 0x55555564fbc0
JOSEF: root 9
Couldn't find the last root for 8
FS_INFO AFTER IS 0x55555564fbc0

Program received signal SIGSEGV, Segmentation fault.
0x000055555559f121 in rb_search (root=root@entry=0x55555564ca20 <inserted>, key=key@entry=0x7fffff7ff020,
    comp=comp@entry=0x55555559af95 <cache_tree_comp_range>, next_ret=next_ret@entry=0x7fffff7ff038)
    at common/rbtree-utils.c:54
54      {
(gdb) bt
#0  0x000055555559f121 in rb_search (root=root@entry=0x55555564ca20 <inserted>, key=key@entry=0x7fffff7ff020,
    comp=comp@entry=0x55555559af95 <cache_tree_comp_range>, next_ret=next_ret@entry=0x7fffff7ff038)
    at common/rbtree-utils.c:54
#1  0x000055555559b199 in search_cache_extent (tree=tree@entry=0x55555564ca20 <inserted>,
    start=start@entry=15645196861440) at common/extent-cache.c:179
#2  0x0000555555584d27 in set_extent_bits (tree=tree@entry=0x55555564ca20 <inserted>, start=15645196861440,
    end=15645196877823, bits=bits@entry=1) at kernel-shared/extent_io.c:380
#3  0x0000555555584f5a in set_extent_dirty (tree=tree@entry=0x55555564ca20 <inserted>, start=<optimized out>,
    end=<optimized out>) at kernel-shared/extent_io.c:486
#4  0x00005555555e1c0e in record_csums_eb (eb=eb@entry=0x55555595fde0, processed=processed@entry=0x7fffffffdbe8)
    at cmds/rescue-init-csum-tree.c:203
#5  0x00005555555e1cf2 in record_csums_eb (eb=eb@entry=0x55555595fde0, processed=processed@entry=0x7fffffffdbe8)
    at cmds/rescue-init-csum-tree.c:224
#6  0x00005555555e1cf2 in record_csums_eb (eb=eb@entry=0x55555595fde0, processed=processed@entry=0x7fffffffdbe8)
    at cmds/rescue-init-csum-tree.c:224
#7  0x00005555555e1cf2 in record_csums_eb (eb=eb@entry=0x55555595fde0, processed=processed@entry=0x7fffffffdbe8)
-- 
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Home page: http://marc.merlins.org/