On Mon, 2015-11-23 at 09:10 +0800, Qu Wenruo wrote: > Also, you won't want compiler to do extra optimization I did the following: $ export CFLAGS="-g -O0 -Wall -D_FORTIFY_SOURCE=2" $ ./configure --disable-convert --disable-documentation
So if you want me to get rid of _FORTIFY_SOURCE, please tell. > > After make, you won't need to install the btrfs-progs, you can just > use > gdb to debug local ./btrfsck and add new breakpoints to do the trick. # gdb ./btrfs GNU gdb (Debian 7.10-1) 7.10 Copyright (C) 2015 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./btrfs...done. (gdb) break cmds-check.c:4421 Breakpoint 1 at 0x42d000: file cmds-check.c, line 4421. (gdb) run check /dev/mapper/data-b Starting program: /home/calestyo/bfsck/btrfs-tools-4.3/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". ... bad extent [6619620278272, 6619620294656), type mismatch with chunk bad extent [6619620294656, 6619620311040), type mismatch with chunk bad extent [6619620311040, 6619620327424), type mismatch with chunk checking free space cache checking fs roots with not breakpoint reached. And I've actually did that with both btrfs where the problem occurred (the master, and the one that send/received snapshots incrementally from it). Hope that helps... anything further to do? Chris.
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