Cyril B.
2012-Jul-25 11:08 UTC
Btrfs-progs: segfault when re-creating filesystem with 3+ devices
Hello,
Running on Linux 3.5.0, with the latest btrfs-progs from today. I was doing
some tests with my 7 devices, and mkfs.btrfs segfaults when executed twice,
creating a filesystem with 3+ devices:
# ./mkfs.btrfs /dev/sdc /dev/sdd /dev/sde
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
adding device /dev/sdd id 2
adding device /dev/sde id 3
fs created label (null) on /dev/sdc
nodesize 4096 leafsize 4096 sectorsize 4096 size 8.19TB
Btrfs Btrfs v0.19
# ./mkfs.btrfs /dev/sdc /dev/sdd /dev/sde
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
adding device /dev/sdd id 2
Segmentation fault
If executed a third time, everything is fine and the filesystem is created
normally. The segfault doesn''t happen with 2 or less devices (but still
happens with 4 or more devices).
Backtrace:
#0 0x00007fba810faaf0 in strcmp () from /lib/libc.so.6
#1 0x000000000041e17c in device_list_add (path=0x7fff10a8a810
"/dev/sdd",
disk_super=0xac9570, devid=2, fs_devices_ret=0x7fff10a8ac88) at
volumes.c:119
#2 0x000000000041e556 in btrfs_scan_one_device (fd=11, path=0x7fff10a8a810
"/dev/sdd", fs_devices_ret=0x7fff10a8ac88, total_devs=0x7fff10a8ac80,
super_offset=65536)
at volumes.c:221
#3 0x000000000042607b in btrfs_scan_block_devices (run_ioctl=1) at
utils.c:1209
#4 0x0000000000425bf0 in btrfs_scan_for_fsid (fs_devices=0xab5020,
total_devs=7, run_ioctls=1) at utils.c:1057
#5 0x000000000042551e in check_mounted_where (fd=9, file=0x7fff10a8ca01
"/dev/sde", where=0x0, size=0, fs_dev_ret=0x0) at utils.c:843
#6 0x0000000000425494 in check_mounted (file=0x7fff10a8ca01
"/dev/sde") at
utils.c:820
#7 0x000000000042be74 in main (ac=4, av=0x7fff10a8b058) at mkfs.c:1402
Thanks.
--
Cyril B.
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