Hi, I faced a problem with send -p command, that occur with an specif snapshot and any parent before it, I isolated the problem being in send as it occur even in a "send -p > /dev/null". I've tried "-vvv" with no extra information success. Send work fine for any of the two snaps. I've deduplicated the FS some times after big addition of data, before snapshotting, with " ./duperemove -rdA -b 64K ". The sending was tried with btrfs-progs 4.4 and 4.7.3, I checked the FS with 4.4, And tried to send both in Kernel version 4.4.0 and 4.7.5, all in Ubuntu 16.04. The FS is a Luks partition, with LVM for system and swap where system is divided in 2 subvolume, "@" and "@home." My FS settings > defaults,noatime,space_cache,ssd_spread,compressr. the result of check: Checking filesystem on /dev/mapper/lvmVG-root UUID: 0b53c097-e5bc-40c0-a328-be4dbbce4828 checking extents checking free space cache checking fs roots checking csums checking root refs found 94834094374 bytes used err is 0 total csum bytes: 90873036 total tree bytes: 1691959296 total fs tree bytes: 1339441152 total extent tree bytes: 231030784 btree space waste bytes: 274492566 file data blocks allocated: 935921709056 referenced 570207657984 scrub: scrub done for 0b53c097-e5bc-40c0-a328-be4dbbce4828 scrub started at Mon Sep 26 03:31:00 2016 and finished after 00:02:55 total bytes scrubbed: 88.38GiB with 0 errors the Kernel log message: Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.548208] ------------[ cut here ]------------ Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.549907] kernel BUG at /home/kernel/COD/linux/fs/btrfs/send.c:5654! Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.551542] invalid opcode: 0000 [#8] SMP Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.553265] Modules linked in: nls_utf8 nls_cp437 vfat fat pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm fuse bnep bbswitch(OE) ext4 jbd2 mbcache intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm arc4 snd_seq_midi snd_seq_midi_event snd_rawmidi dcdbas iwldvm kvm_intel btusb mac80211 snd_seq btrtl kvm btbcm uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 btintel videobuf2_core snd_seq_device irqbypass bluetooth iwlwifi videodev intel_cstate media intel_rapl_perf joydev crc16 serio_raw cfg80211 snd_timer sg rfkill snd lpc_ich mei_me mfd_core mei soundcore shpchp wmi battery evdev dell_smo8800 tpm_tis ac tpm squashfs loop parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq algif_skcipher af_alg dm_crypt dm_mod sr_mod cdrom sd_mod hid_generic usbhid hid uas usb_storage crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel jitterentropy_rng hmac i915 drbg ansi_cprng ahci libahci aesni_intel libata aes_x86_64 lrw gf128mul xhci_pci i2c_algo_bit glue_helper ablk_helper xhci_hcd scsi_mod ehci_pci drm_kms_helper r8169 cryptd ehci_hcd psmouse drm usbcore mii usb_common thermal video fjes button Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.564184] CPU: 3 PID: 20573 Comm: btrfs Tainted: G D OE 4.7.5-040705-generic #201609240533 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.566022] Hardware name: Dell Inc. Dell System XPS L502X/04X7VP, BIOS A09 01/13/2012 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.567858] task: ffff8802aa8db140 ti: ffff88010065c000 task.ti: ffff88010065c000 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569810] RIP: 0010:[<ffffffffc06c13d7>] [<ffffffffc06c13d7>] changed_cb+0x247/0xad0 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569813] RSP: 0018:ffff88010065fb80 EFLAGS: 00010293 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569814] RAX: 00000000000147ef RBX: 0000000000000002 RCX: 0000000000000000 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569815] RDX: ffff88010065fc65 RSI: ffff8802ee1575b0 RDI: 0000000000000282 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569815] RBP: ffff880373aecee0 R08: 0000000000000000 R09: 0000000000000000 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569815] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010065fc65 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569816] R13: ffff8802efc93000 R14: 0000000000000000 R15: ffff88040f174600 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569817] FS: 00007ff666a858c0(0000) GS:ffff88043e4c0000(0000) knlGS:0000000000000000 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569817] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569818] CR2: 00007ff665a1be38 CR3: 00000002f3fbd000 CR4: 00000000000406e0 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569818] Stack: Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569820] ffff8802ec4236d0 ffff8802ee157ee0 ffff88042709f000 ffffffffc06202cf Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569821] ffff8802ee157ee0 0000000000000000 0000000000000035 0000000000000011 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569821] ffffffffc0669c6c efff880429078000 ffff880429134000 ffffffffc067577f Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569822] Call Trace: Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569832] [<ffffffffc06202cf>] ? read_node_slot+0x9f/0xc0 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569844] [<ffffffffc0669c6c>] ? btrfs_get_token_32+0x10c/0x130 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569856] [<ffffffffc067577f>] ? memcmp_extent_buffer+0xbf/0x120 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569864] [<ffffffffc062a8c0>] ? btrfs_compare_trees+0x560/0x690 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569875] [<ffffffffc06c1190>] ? finish_inode_if_needed+0xab0/0xab0 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569894] [<ffffffffc06c2ba0>] ? btrfs_ioctl_send+0xf40/0x11c0 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569905] [<ffffffffc068ada8>] ? btrfs_ioctl+0x818/0x1fe0 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569908] [<ffffffff810ae318>] ? enqueue_task_fair+0x58/0x910 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569910] [<ffffffff81034735>] ? sched_clock+0x5/0x10 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569912] [<ffffffff8120c05e>] ? do_vfs_ioctl+0x9e/0x5e0 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569913] [<ffffffff81077e4e>] ? _do_fork+0x13e/0x390 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569915] [<ffffffff8120c614>] ? SyS_ioctl+0x74/0x80 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569918] [<ffffffff815f1af6>] ? entry_SYSCALL_64_fastpath+0x1e/0xa8 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569928] Code: f6 0f 88 7f fe ff ff bb 02 00 00 00 e9 16 fe ff ff 48 8d 55 40 4c 89 c1 48 89 ee 4c 89 ff e8 91 dd ff ff 41 89 c6 e9 5b fe ff ff <0f> 0b 49 8b 87 18 01 00 00 f7 c3 fd ff ff ff 48 8b 00 41 c7 87 Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569942] RIP [<ffffffffc06c13d7>] changed_cb+0x247/0xad0 [btrfs] Sep 25 23:23:35 romulo-Dell-System-XPS-L502X kernel: [19740.569942] RSP <ffff88010065fb80> Att, Romulo Pulcinelli Benedetti -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
