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
sco...@scottyedmonds.com
________________________________________
From: Austin S Hemmelgarn <ahferro...@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.
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