Re: bad extent [5993525264384, 5993525280768), type mismatch with chunk

[Christoph Anton Mitterer <calestyo@scientia.net>]

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Hey Qu.


On Sun, 2015-11-22 at 10:04 +0800, Qu Wenruo wrote:
> If any of you can recompile btrfs-progs and use gdb to debug it,
> would 
> anyone please to investigate where did the wrong_chunk_type is set?
> It is in the function check_extent_type():

Not 100% what you want... AFAIU, you just want to see whether that line
is reached?

If didn't re-compile but used the btrfs-tools-dbg package, but I guess
that should do.

In the debian version that line seems to be at:
4374 
4375 /* Check if the type of extent matches with its chunk */
4376 static void check_extent_type(struct extent_record *rec)
4377 {
...
4419                         bg_type = BTRFS_BLOCK_GROUP_METADATA;
4420                 if (!(bg_cache->flags & bg_type))
4421                         rec->wrong_chunk_type = 1;
4422         }
4423 }

Running:
# gdb btrfs
(gdb) dir /root/btrfs-tools-4.3
Source directories searched: /root/btrfs-tools-4.3:$cdir:$cwd
(gdb) break cmds-check.c:4421
Breakpoint 1 at 0x41d859: file cmds-check.c, line 4421.
(gdb) run check /dev/mapper/data-b
Starting program: /bin/btrfs check /dev/mapper/data-b
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

... in fact reaches that breakpoint:
Breakpoint 1, check_extent_type (rec=rec@entry=0x884290) at cmds-check.c:4423
4423	}

... but the error message ("bad extent [5993525264384, 5993525280768),
type mismatch with chunk") doesn't seem to be printed at that stage... 


If I continue, it goes for a while:

Breakpoint 1, check_extent_type (rec=rec@entry=0x884290) at cmds-check.c:4423
4423	}
(gdb) cont 100000
Will ignore next 99999 crossings of breakpoint 1.  Continuing.

and so on for at least several million crossings... I then removed the
breakpoint and after a longer while the usual error messages came up.


Does that help?

Chris.

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