Hello I did the following commands and resulted in a segmentation fault.
[r...@localhost ~]# mkfs.btrfs /dev/sda6 WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using fs created label (null) on /dev/sda6 nodesize 4096 leafsize 4096 sectorsize 4096 size 46.93GB Btrfs Btrfs v0.19 [r...@localhost ~]# mount /dev/sda6 /mnt/btra [r...@localhost ~]# cd /mnt/btra [r...@localhost btra]# touch {1..10} [r...@localhost btra]# btrfs subvolume snapshot . snap Create a snapshot of '.' in './snap' [r...@localhost btra]# cd snap [r...@localhost snap]# echo "snapshot" >> 1 [r...@localhost snap]# cd .. [r...@localhost btra]# mkdir dir [r...@localhost btra]# cd dir [r...@localhost dir]# btrfs subvolume snapshot .. snap Create a snapshot of '..' in './snap' [r...@localhost dir]# cd ../.. [r...@localhost mnt]# umount btra [r...@localhost mnt]# mount -o subvol=dir/snap /dev/sda6 btra Segmentation fault And dmesg shows: e1000e 0000:00:19.0: eth0: 10/100 speed: disabling TSO ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready eth0: no IPv6 routers present fuse init (API version 7.14) Btrfs loaded device fsid bf4b2dc4dca2c8f8-a523f8dd8f6aa4ad devid 1 transid 7 /dev/sda6 device fsid bf4b2dc4dca2c8f8-a523f8dd8f6aa4ad devid 1 transid 12 /dev/sda6 BUG: Dentry ffff8800aac528f8{i=100,n=/} still in use (1) [unmount of btrfs sda6] ------------[ cut here ]------------ kernel BUG at fs/dcache.c:675! invalid opcode: 0000 [#1] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/dev CPU 1 Modules linked in: btrfs zlib_deflate libcrc32c fuse sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 uinput snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep ppdev dell_wmi parport_pc e1000e snd_seq parport snd_seq_device wmi snd_pcm snd_timer snd soundcore snd_page_alloc serio_raw i2c_i801 iTCO_wdt iTCO_vendor_support dcdbas microcode pata_acpi ata_generic radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan] Pid: 2465, comm: mount Not tainted 2.6.35-0.47.rc5.git2.fc14.x86_64 #1 0V4W66/OptiPlex 780 RIP: 0010:[<ffffffff8113a58c>] [<ffffffff8113a58c>] shrink_dcache_for_umount_subtree+0x133/0x210 RSP: 0018:ffff8800a9d3dc88 EFLAGS: 00010296 RAX: 0000000000000057 RBX: ffff8800aac528f8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81eee894 RDI: 0000000000000246 RBP: ffff8800a9d3dcb8 R08: 000000000000ba70 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8800aac528f8 R13: 0000000000000000 R14: ffff8800aac52998 R15: ffff8801234432c0 FS: 00007effe69db7e0(0000) GS:ffff880002e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000fd1198 CR3: 00000000aa06e000 CR4: 00000000000406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process mount (pid: 2465, threadinfo ffff8800a9d3c000, task ffff8800abaea450) Stack: ffff8800c2e32e28 ffff8800aad7cfd8 ffff8800c2e32968 ffff8800aac528f8 <0> 00000000fffffff3 fffffffffffffff3 ffff8800a9d3dcd8 ffffffff8113b1fd <0> ffff8800c2e32968 ffffffffa034db10 ffff8800a9d3dcf8 ffffffff8112af26 Call Trace: [<ffffffff8113b1fd>] shrink_dcache_for_umount+0x40/0x51 [<ffffffff8112af26>] generic_shutdown_super+0x1f/0xe1 [<ffffffff8112b03d>] kill_anon_super+0x16/0x54 [<ffffffff8112b604>] deactivate_locked_super+0x26/0x46 [<ffffffffa02fdaeb>] btrfs_get_sb+0x360/0x3ec [btrfs] [<ffffffff81111378>] ? alloc_pages_current+0xb2/0xc2 [<ffffffff8112b85a>] vfs_kern_mount+0xad/0x1a0 [<ffffffff8112b9b5>] do_kern_mount+0x4d/0xef [<ffffffff81141cbc>] do_mount+0x732/0x78f [<ffffffff81141f4e>] sys_mount+0x88/0xc2 [<ffffffff81009c72>] system_call_fastpath+0x16/0x1b Code: 00 00 48 8b 40 28 4c 8b 08 48 8b 43 50 48 85 c0 74 04 48 8b 50 40 48 89 34 24 48 c7 c7 26 90 7a 81 48 89 de 31 c0 e8 c0 b6 35 00 <0f> 0b 4c 8b 63 68 4c 39 e3 74 0a 4c 89 e7 e8 5f f0 ff ff eb 03 RIP [<ffffffff8113a58c>] shrink_dcache_for_umount_subtree+0x133/0x210 RSP <ffff8800a9d3dc88> ---[ end trace 0be5fe6dc2c0d3ad ]--- This problem is reproducible on 2.6.33.6-147.fc13.x86_64 and 2.6.35-0.47.rc5.git2.fc14.x86_64 provided by the Fedora distribution. It is also reproducible on another machine with the 2.6.35-rc6+ kernel from the "mainline" git repository of kernel.org. It can be produced with the same procedure as shown above. Kunshan Wang -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
