On Fri, Sep 11, 2015 at 10:39 AM, Jonas von Malottki <yosh...@gmx.net> wrote: > Hi Btrfslers, > > I was playing around with send and receive facility to store backups at a > remote machine. Unfortunately I send more data to a device that it could > handle. So the receive operation was ended with "could not write file, no > more space left on device". So far so good, no big deal. To my surprise the > snapshot was transferred but was incomplete (you could actually cd into the > snap and view files, but some were missing). Naturally I didn't trust the > snapshot so I deleted it via btrfs sub del. As I needed more space I deleted > also all other subvolumes. So the device was emtpy, a btrfs subvol list -a > /mntpoint showed nothing, but there was still around 500gb on the btrfs > volume (btrfs fil df), so I dismounted the dev and started a btrfs check > --repair /dev/sdb2 (output below) followed by mounting it via subvolid > "mount -t btrfs -o subvolid=0 /dev/sdb2 /mnt/btrfs2". But it showed that > there were still 27% of the device in use (2TB device) with supposedly > nothing on it. So I tried to dismount it to reformat the device, but the > umount just hang and a quick look into dmesg (below) showed that something > was freaked up. > > No real damage done, just wanted you to know maybe you can fix a bug. I can > leave the device for a few days if you would like to have special > information. But i'll have to reboot at least. > > Thanks for all cool btrfs features though :). > > Best regards > Jonas > > > > Output requested (but defunct after the whole stuff happened): > > vid@tauon:~$ uname -a > Linux tauon 3.19.0-28-generic #30-Ubuntu SMP Mon Aug 31 15:52:51 UTC 2015 > x86_64 x86_64 x86_64 GNU/Linux > vid@tauon:~$ btrfs --version > Btrfs v3.17 > vid@tauon:~$ btrfs fi show > ERROR: unable to access '/mnt/btrfs1' > ERROR: could not open /dev/sdb2 > ERROR: could not open /dev/sdc1 > Btrfs v3.17 > > > Output from Repair: > > vid@tauon:/mnt$ sudo btrfs check --repair /dev/sdb2 > enabling repair mode > Fixed 0 roots. > Checking filesystem on /dev/sdb2 > UUID: 1af082d6-10f5-45b6-8373-c67b5c595ed6 > checking extents > checking free space cache > cache and super generation don't match, space cache will be invalidated > checking fs roots > checking csums > checking root refs > found 256752151257 bytes used err is 0 > total csum bytes: 512030428 > total tree bytes: 557645824 > total fs tree bytes: 5079040 > total extent tree bytes: 4685824 > btree space waste bytes: 31440848 > file data blocks allocated: 524450885632 > referenced 524450885632 > Btrfs v3.17 > > > > > Output from Dmesg > > > [84963.514765] btrfs[6456]: segfault at 0 ip 00007fcba71e36b4 sp > 00007ffe01ba8c40 error 4 in libc-2.21.so[7fcba71a8000+1c0000] > [86002.789758] BTRFS info (device sdb2): disk space caching is enabled > [86003.549464] BTRFS: checking UUID tree > [86077.520375] ------------[ cut here ]------------ > [86077.520381] kernel BUG at > /build/linux-5xFjum/linux-3.19.0/fs/btrfs/inode.c:3142! > [86077.520383] invalid opcode: 0000 [#1] SMP > [86077.520386] Modules linked in: cfg80211 snd_hda_codec_hdmi gpio_ich > kvm_intel kvm snd_emu10k1_synth snd_emux_synth snd_seq_midi_emul > snd_seq_virmidi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel > snd_emu10k1 snd_hda_controller snd_hda_codec snd_util_mem serio_raw snd_hwdep > snd_ac97_codec ac97_bus snd_seq_midi snd_seq_midi_event joydev snd_rawmidi > nvidia(POE) lpc_ich snd_pcm snd_seq emu10k1_gp snd_seq_device gameport > snd_timer snd drm soundcore x38_edac 8250_fintek edac_core shpchp mac_hid > it87 hwmon_vid coretemp parport_pc ppdev lp parport autofs4 pata_acpi btrfs > xor raid6_pq hid_generic usbhid hid firewire_ohci firewire_core crc_itu_t > r8169 mii ahci pata_jmicron libahci > [86077.520421] CPU: 1 PID: 6519 Comm: btrfs-cleaner Tainted: P OE > 3.19.0-28-generic #30-Ubuntu > [86077.520422] Hardware name: Gigabyte Technology Co., Ltd. X38-DQ6/X38-DQ6, > BIOS F9F 07/30/2008 > [86077.520425] task: ffff88020ed68000 ti: ffff88020ee90000 task.ti: > ffff88020ee90000 > [86077.520426] RIP: 0010:[<ffffffffc03caa00>] [<ffffffffc03caa00>] > btrfs_orphan_add+0x1c0/0x1e0 [btrfs] > [86077.520447] RSP: 0018:ffff88020ee93c38 EFLAGS: 00010286 > [86077.520449] RAX: 00000000ffffffe4 RBX: ffff880002004800 RCX: > ffff880104cfa000 > [86077.520450] RDX: 000000000000510e RSI: 0000000000040000 RDI: > ffff880104cfa138 > [86077.520452] RBP: ffff88020ee93c78 R08: 000000000001db10 R09: > ffff880210fcf090 > [86077.520453] R10: ffff88022fc9db50 R11: ffffea0008744840 R12: > ffff880105660578 > [86077.520455] R13: ffff8802226ef630 R14: ffff880002004c58 R15: > 0000000000000001 > [86077.520456] FS: 0000000000000000(0000) GS:ffff88022fc80000(0000) > knlGS:0000000000000000 > [86077.520458] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [86077.520460] CR2: 00007f8167699148 CR3: 0000000001c13000 CR4: > 00000000000007e0 > [86077.520461] Stack: > [86077.520462] ffff88020ee93c78 ffffffffc0408ca5 ffff880104cfa000 > ffff880002001800 > [86077.520465] ffff880210fcf090 ffff880105660578 ffff880223b7ec00 > ffff8801b8337d80 > [86077.520468] ffff88020ee93d08 ffffffffc03b42da ffff880210fcf098 > ffff880210fcf110 > [86077.520470] Call Trace: > [86077.520487] [<ffffffffc0408ca5>] ? lookup_free_space_inode+0x45/0xf0 > [btrfs] > [86077.520498] [<ffffffffc03b42da>] btrfs_remove_block_group+0x13a/0x760 > [btrfs] > [86077.520513] [<ffffffffc03edeea>] btrfs_remove_chunk+0x63a/0x760 [btrfs] > [86077.520524] [<ffffffffc03b4b49>] btrfs_delete_unused_bgs+0x249/0x270 > [btrfs] > [86077.520536] [<ffffffffc03bd144>] cleaner_kthread+0x144/0x1a0 [btrfs] > [86077.520547] [<ffffffffc03bd000>] ? check_leaf+0x360/0x360 [btrfs] > [86077.520552] [<ffffffff81095939>] kthread+0xc9/0xe0 > [86077.520555] [<ffffffff81095870>] ? kthread_create_on_node+0x1c0/0x1c0 > [86077.520558] [<ffffffff817cb618>] ret_from_fork+0x58/0x90 > [86077.520560] [<ffffffff81095870>] ? kthread_create_on_node+0x1c0/0x1c0 > [86077.520562] Code: 60 04 00 00 e9 b0 fe ff ff 66 90 89 45 c8 f0 41 80 64 24 > 80 fd 4c 89 e7 e8 1e 21 fe ff 8b 45 c8 e9 1b ff ff ff 66 0f 1f 44 00 00 <0f> > 0b b8 f4 ff ff ff e9 10 ff ff ff 4c 89 f7 45 31 f6 e8 69 07 > [86077.520587] RIP [<ffffffffc03caa00>] btrfs_orphan_add+0x1c0/0x1e0 [btrfs] > [86077.520600] RSP <ffff88020ee93c38> > [86077.520602] ---[ end trace 24353018afe32b08 ]---
It isn't a corruption, just a failure to reserve space necessary for block group deletion (triggering a BUG_ON / hang). This got fixed in kernel 4.0: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d84be799194147e04c0e3129ed44a948773b80a > -- > 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 -- Filipe David Manana, "Reasonable men adapt themselves to the world. Unreasonable men adapt the world to themselves. That's why all progress depends on unreasonable men." -- 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
