Re: BTRFS Error - Rockstor

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

Scotty Edmonds wrote on 2015/11/18 12:50 +0000:
> (gdb) run rescue chunk-recover -y /dev/sdg
> Starting program: /usr/sbin/btrfs rescue chunk-recover -y /dev/sdg
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> [New Thread 0x7ffff6f85700 (LWP 4140)]
> [New Thread 0x7ffff6784700 (LWP 4141)]
> [New Thread 0x7ffff5f83700 (LWP 4142)]
> [New Thread 0x7ffff5782700 (LWP 4143)]
> [New Thread 0x7ffff4f81700 (LWP 4144)]
> Scanning: 2441862246400 in dev0, 2068329484288 in dev1, 3000574365696 in dev2, 2233151475712 in dev3, 2449691725824 in dev4[Thread 0x7ffff5f83700 (LWP 4142) exited]
> Scanning: 2999962390528 in dev0, 2566459445248 in dev1, DONE in dev2, 2748207828992 in dev3, 3000592969728 in dev4[Thread 0x7ffff4f81700 (LWP 4144) exited]
> Scanning: 3000580788224 in dev0, 2567040225280 in dev1, DONE in dev2, 2748795932672 in dev3, DONE in dev4[Thread 0x7ffff6f85700 (LWP 4140) exited]
> Scanning: DONE in dev0, 2806774272000 in dev1, DONE in dev2, 3000592969728 in dev3, DONE in dev4[Thread 0x7ffff5782700 (LWP 4143) exited]
> Scanning: DONE in dev0, 3000592969728 in dev1, DONE in dev2, DONE in dev3, DONE in dev4[Thread 0x7ffff6784700 (LWP 4141) exited]
> Scanning: DONE in dev0, DONE in dev1, DONE in dev2, DONE in dev3, DONE in dev4
>
> Program received signal SIGFPE, Arithmetic exception.
> 0x00000000004273d8 in calc_stripe_length ()
> (gdb)

Good enough to fix the float point error.
The patch will come soon.

Thanks for the info and help from Austin.
Qu
>
> (gdb) bt
> #0  0x00000000004273d8 in calc_stripe_length ()
> #1  0x000000000043191e in btrfs_recover_chunk_tree ()
> #2  0x000000000042f473 in cmd_rescue_chunk_recover ()
> #3  0x000000000040ea72 in main ()
> (gdb)
>
> Thanks,
>
> Scotty Edmonds
> Scotty@ScottyEdmonds.com
>
> ________________________________________
> From: Austin S Hemmelgarn <ahferroin7@gmail.com>
> Sent: November-17-15 8:38 AM
> To: Scotty Edmonds; Qu Wenruo; Hugo Mills; Donald Pearson
> Cc: Btrfs BTRFS
> Subject: Re: BTRFS Error - Rockstor
>
> On 2015-11-17 03:08, Scotty Edmonds wrote:
>> Sorry, I'm not at all familiar with backtrace.
>>
> General procedure to get a backtrace on a system without core files:
> 1. Make sure you have debugging symbols installed for the program you
> want the backtrace for, and ideally any libraries it uses.  (These
> usually are in packages with names ending in -dbg or -debug.  In the
> case of btrfs, you'll probably need symbols for glibc, lzo, and zlib).
> 2. Start the program under gdb ('gdb /sbin/btrfs')
> 3. When gdb is done loading, type in 'start' followed by the arguments
> for the program (in this case, 'rescue chunk-recover -y /dev/sdg')
> 4. If gdb then says something about stopping at a breakpoint, enter the
> command 'continue'.
> 5. When the program being debugged crashes, you should get a backtrace
> from gdb, if not, you can enter the command 'bt' to tell it to dump a
> backtrace.
> 6. After copying the backtrace somewhere you can put it in an e-mail,
> you can exit gdb with the 'exit' command, it may complain about
> something still running, it's safe to tell it to kill this process.
>
> If instead you have your system configured for core dumps:
> 1. Make sure you have debugging symbols installed for the program you
> want the backtrace for, and ideally any libraries it uses.
> 2. Run gdb with the program and core file ('gdb /sbin/btrfs
> /path/to/core/file').
> 3. Enter the command 'bt to get a backtrace.
>