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

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

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Hey again.

So it seems that data-b is always fine (well at least three times in a
row) and data-old-a always gives errors.

including e.g:
bad extent [3067663679488, 3067663695872), type mismatch with chunk
bad extent [3067663876096, 3067663892480), type mismatch with chunk
bad extent [3067663892480, 3067663908864), type mismatch with chunk
bad extent [3067663908864, 3067663925248), type mismatch with chunk
bad extent [3067669348352, 3067669364736), type mismatch with chunk
bad extent [3067669430272, 3067669446656), type mismatch with chunk
bad extent [3067669659648, 3067669676032), type mismatch with chunk
bad extent [3067669790720, 3067669807104), type mismatch with chunk
bad extent [3067669807104, 3067669823488), type mismatch with chunk
bad extent [3067669823488, 3067669839872), type mismatch with chunk
bad extent [3067669872640, 3067669889024), type mismatch with chunk
bad extent [3067669921792, 3067669938176), type mismatch with chunk
bad extent [3067671805952, 3067671822336), type mismatch with chunk

I've started debugging (everything as before) with:
(gdb) break cmds-check.c:4387
Breakpoint 1 at 0x42cf2b: file cmds-check.c, line 4387.
(gdb) break cmds-check.c:4394
Breakpoint 2 at 0x42cf57: file cmds-check.c, line 4394.
(gdb) break cmds-check.c:4411
Breakpoint 3 at 0x42cfa6: file cmds-check.c, line 4411.
(gdb) break cmds-check.c:4421
Breakpoint 4 at 0x42d000: file cmds-check.c, line 4421.

Hit a:
Breakpoint 1, check_extent_type (rec=0x1a44130) at cmds-check.c:4387
4387				rec->wrong_chunk_type = 1;
(gdb) bt
#0  check_extent_type (rec=0x1a44130) at cmds-check.c:4387
#1  0x000000000042d6a5 in add_extent_rec (extent_cache=0x7fffffffdf30, parent_key=0x0, parent_gen=0, start=1097665216512, nr=16384, extent_item_refs=1, is_root=0, inc_ref=0, set_checked=0, 
    metadata=0, extent_rec=1, max_size=16384) at cmds-check.c:4576
#2  0x000000000042ecc9 in process_extent_item (root=0x919d20, extent_cache=0x7fffffffdf30, eb=0x1a0edb0, slot=95) at cmds-check.c:5142
#3  0x0000000000430aea in run_next_block (root=0x919d20, bits=0x91e220, bits_nr=1024, last=0x7fffffffdb78, pending=0x7fffffffdf10, seen=0x7fffffffdf20, reada=0x7fffffffdf00, 
    nodes=0x7fffffffdef0, extent_cache=0x7fffffffdf30, chunk_cache=0x7fffffffdf90, dev_cache=0x7fffffffdfa0, block_group_cache=0x7fffffffdf70, dev_extent_cache=0x7fffffffdf40, ri=0x6cef30)
    at cmds-check.c:5960
#4  0x00000000004356c4 in deal_root_from_list (list=0x7fffffffdc00, root=0x919d20, bits=0x91e220, bits_nr=1024, pending=0x7fffffffdf10, seen=0x7fffffffdf20, reada=0x7fffffffdf00, 
    nodes=0x7fffffffdef0, extent_cache=0x7fffffffdf30, chunk_cache=0x7fffffffdf90, dev_cache=0x7fffffffdfa0, block_group_cache=0x7fffffffdf70, dev_extent_cache=0x7fffffffdf40)
    at cmds-check.c:8014
#5  0x0000000000435d91 in check_chunks_and_extents (root=0x919d20) at cmds-check.c:8181
#6  0x0000000000438e2b in cmd_check (argc=1, argv=0x7fffffffe220) at cmds-check.c:9627
#7  0x0000000000409d49 in main (argc=2, argv=0x7fffffffe220) at btrfs.c:252
(gdb) continue
Continuing.

Breakpoint 1, check_extent_type (rec=0x1a44130) at cmds-check.c:4387
4387				rec->wrong_chunk_type = 1;
(gdb) bt
#0  check_extent_type (rec=0x1a44130) at cmds-check.c:4387
#1  0x000000000042d856 in add_tree_backref (extent_cache=0x7fffffffdf30, bytenr=1097665216512, parent=1314162819072, root=0, found_ref=0) at cmds-check.c:4624
#2  0x000000000042ede2 in process_extent_item (root=0x919d20, extent_cache=0x7fffffffdf30, eb=0x1a0edb0, slot=95) at cmds-check.c:5161
#3  0x0000000000430aea in run_next_block (root=0x919d20, bits=0x91e220, bits_nr=1024, last=0x7fffffffdb78, pending=0x7fffffffdf10, seen=0x7fffffffdf20, reada=0x7fffffffdf00, 
    nodes=0x7fffffffdef0, extent_cache=0x7fffffffdf30, chunk_cache=0x7fffffffdf90, dev_cache=0x7fffffffdfa0, block_group_cache=0x7fffffffdf70, dev_extent_cache=0x7fffffffdf40, ri=0x6cef30)
    at cmds-check.c:5960
#4  0x00000000004356c4 in deal_root_from_list (list=0x7fffffffdc00, root=0x919d20, bits=0x91e220, bits_nr=1024, pending=0x7fffffffdf10, seen=0x7fffffffdf20, reada=0x7fffffffdf00, 
    nodes=0x7fffffffdef0, extent_cache=0x7fffffffdf30, chunk_cache=0x7fffffffdf90, dev_cache=0x7fffffffdfa0, block_group_cache=0x7fffffffdf70, dev_extent_cache=0x7fffffffdf40)
    at cmds-check.c:8014
#5  0x0000000000435d91 in check_chunks_and_extents (root=0x919d20) at cmds-check.c:8181
#6  0x0000000000438e2b in cmd_check (argc=1, argv=0x7fffffffe220) at cmds-check.c:9627
#7  0x0000000000409d49 in main (argc=2, argv=0x7fffffffe220) at btrfs.c:252

You've mentioned add_extent_rec() before, but that doesn't seem to
contain bytenr so I cannot break on it.

I tried it with add_tree_backref instead, maybe that's already helpful
for you until you give me further instructions on what to debug:
Breakpoint 5 at 0x42d84a: file cmds-check.c, line 4624.
(gdb) continue 
Continuing.

Breakpoint 5, add_tree_backref (extent_cache=0x7fffffffdf30, bytenr=3067669348352, parent=0, root=2, found_ref=0) at cmds-check.c:4624
4624		check_extent_type(rec);
(gdb) bt
#0  add_tree_backref (extent_cache=0x7fffffffdf30, bytenr=3067669348352, parent=0, root=2, found_ref=0) at cmds-check.c:4624
#1  0x000000000042edb8 in process_extent_item (root=0x919d20, extent_cache=0x7fffffffdf30, eb=0x1a0edb0, slot=96) at cmds-check.c:5157
#2  0x0000000000430aea in run_next_block (root=0x919d20, bits=0x91e220, bits_nr=1024, last=0x7fffffffdb78, pending=0x7fffffffdf10, seen=0x7fffffffdf20, reada=0x7fffffffdf00, 
    nodes=0x7fffffffdef0, extent_cache=0x7fffffffdf30, chunk_cache=0x7fffffffdf90, dev_cache=0x7fffffffdfa0, block_group_cache=0x7fffffffdf70, dev_extent_cache=0x7fffffffdf40, ri=0x6cef30)
    at cmds-check.c:5960
#3  0x00000000004356c4 in deal_root_from_list (list=0x7fffffffdc00, root=0x919d20, bits=0x91e220, bits_nr=1024, pending=0x7fffffffdf10, seen=0x7fffffffdf20, reada=0x7fffffffdf00, 
    nodes=0x7fffffffdef0, extent_cache=0x7fffffffdf30, chunk_cache=0x7fffffffdf90, dev_cache=0x7fffffffdfa0, block_group_cache=0x7fffffffdf70, dev_extent_cache=0x7fffffffdf40)
    at cmds-check.c:8014
#4  0x0000000000435d91 in check_chunks_and_extents (root=0x919d20) at cmds-check.c:8181
#5  0x0000000000438e2b in cmd_check (argc=1, argv=0x7fffffffe220) at cmds-check.c:9627
#6  0x0000000000409d49 in main (argc=2, argv=0x7fffffffe220) at btrfs.c:252

(btw: all lines are 4.3 including your patch)


breakpoint 5 would be reached many times:

Breakpoint 5, add_tree_backref (extent_cache=0x7fffffffdf30, bytenr=3067669348352, parent=0, root=2, found_ref=0) at cmds-check.c:4624
4624		check_extent_type(rec);
(gdb) continue 
Continuing.

Breakpoint 5, add_tree_backref (extent_cache=0x7fffffffdf30, bytenr=3067669348352, parent=0, root=7, found_ref=0) at cmds-check.c:4624
4624		check_extent_type(rec);
(gdb) continue 
Continuing.

Breakpoint 5, add_tree_backref (extent_cache=0x7fffffffdf30, bytenr=3067669348352, parent=0, root=7, found_ref=0) at cmds-check.c:4624
4624		check_extent_type(rec);
(gdb) continue 
Continuing.

Cheers,
Chris.

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