Greetings, A call to: btrfs send -vvv -p <parent> <child> | ssh <host> "btrfs receive -vvve <dir>" fails with: ERROR: send ioctl failed with -5: Input/output error ERROR: unexpected EOF in stream. Resulting in the kernel log below on the sending system. The key line seems to be: Mar 8 18:13:23 kernel: [ 2041.956270] btrfs: btrfs_compare_tree detected a change in one of the trees while iterating. This is probably a bug. I've searched but Google didn't seem to find anyone reporting a similar error. This is running on Debian sid, fully up to date. The source drive is an Intel 320 SSD and smartctl doesn't indicate any issues with it. The read-only subvolumes acting as the parent and child would have been created with an older kernel, perhaps 3.2. I tried taking a new read-only snapshot of the child and sending that, but the effect was the same. I also tried mounting the source filesystem read-only, but there was no difference. If I make a read-only snapshot of the parent and send that snapshot as a child of the parent, that sends OK. Please let me know if I can provide any further assistance in tracking this down (and thanks for all the great work on btrfs). $ uname -a Linux 3.13-1-amd64 #1 SMP Debian 3.13.5-1 (2014-03-04) x86_64 GNU/Linux Mar 8 18:12:51 kernel: [ 2009.568506] ------------[ cut here ]------------ Mar 8 18:12:51 kernel: [ 2009.568564] WARNING: CPU: 1 PID: 1264 at /build/linux-UvfduQ/linux-3.13.5/fs/btrfs/send.c:4687 btrfs_ioctl_send+0xba6/0xbc0 [btrfs]() Mar 8 18:12:51 kernel: [ 2009.568569] Modules linked in: ext4 crc16 mbcache jbd2 iTCO_wdt coretemp iTCO_vendor_support psmouse serio_raw pcspkr i2c_i801 i2c_core lpc_ich mfd_core joydev evdev processor button thermal_sys raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx md_mod ipmi_si ipmi_devintf ipmi_msghandler autofs4 btrfs xor raid6_pq crc32c libcrc32c sg sd_mod crct10dif_generic crc_t10dif crct10dif_common hid_generic usbhid hid ata_generic ata_piix libata scsi_mod e1000e ptp pps_core ehci_pci uhci_hcd ehci_hcd usbcore usb_common Mar 8 18:12:51 kernel: [ 2009.568635] CPU: 1 PID: 1264 Comm: btrfs Tainted: G W 3.13-1-amd64 #1 Debian 3.13.5-1 Mar 8 18:12:51 kernel: [ 2009.568639] Hardware name: Supermicro X7SPA-HF/X7SPA-HF, BIOS 1.2a 02/21/12 Mar 8 18:12:51 kernel: [ 2009.568643] 0000000000000009 ffffffff814a0927 0000000000000000 ffffffff8105ba72 Mar 8 18:12:51 kernel: [ 2009.568652] 00007fff1006a1e8 ffff8800b92d9380 00007fff1006a1e8 ffff8800b92d9380 Mar 8 18:12:51 kernel: [ 2009.568658] 0000000000000001 ffffffffa0214e96 ffff88013fff9b08 ffff8800360f8000 Mar 8 18:12:51 kernel: [ 2009.568666] Call Trace: Mar 8 18:12:51 kernel: [ 2009.568677] [<ffffffff814a0927>] ? dump_stack+0x41/0x51 Mar 8 18:12:51 kernel: [ 2009.568685] [<ffffffff8105ba72>] ? warn_slowpath_common+0x72/0x90 Mar 8 18:12:51 kernel: [ 2009.568714] [<ffffffffa0214e96>] ? btrfs_ioctl_send+0xba6/0xbc0 [btrfs] Mar 8 18:12:51 kernel: [ 2009.568723] [<ffffffff8111eee9>] ? __alloc_pages_nodemask+0x149/0x9d0 Mar 8 18:12:51 kernel: [ 2009.568731] [<ffffffff811607c9>] ? kmem_getpages+0xb9/0x140 Mar 8 18:12:51 kernel: [ 2009.568758] [<ffffffffa01e4b6a>] ? btrfs_ioctl+0xfca/0x25d0 [btrfs] Mar 8 18:12:51 kernel: [ 2009.568766] [<ffffffff8108706c>] ? set_task_cpu+0x5c/0x160 Mar 8 18:12:51 kernel: [ 2009.568775] [<ffffffff8126f860>] ? cpumask_next_and+0x30/0x40 Mar 8 18:12:51 kernel: [ 2009.568781] [<ffffffff8108d4ef>] ? select_task_rq_fair+0x2af/0x6f0 Mar 8 18:12:51 kernel: [ 2009.568789] [<ffffffff8101981f>] ? native_sched_clock+0xf/0x70 Mar 8 18:12:51 kernel: [ 2009.568796] [<ffffffff8108f827>] ? enqueue_task_fair+0x2c7/0xe10 Mar 8 18:12:51 kernel: [ 2009.568803] [<ffffffff81086e25>] ? check_preempt_curr+0x65/0x90 Mar 8 18:12:51 kernel: [ 2009.568810] [<ffffffff81088c45>] ? wake_up_new_task+0xd5/0x160 Mar 8 18:12:51 kernel: [ 2009.568817] [<ffffffff8118b5bf>] ? do_vfs_ioctl+0x2cf/0x4a0 Mar 8 18:12:51 kernel: [ 2009.568823] [<ffffffff8118b810>] ? SyS_ioctl+0x80/0xa0 Mar 8 18:12:51 kernel: [ 2009.568831] [<ffffffff814ade99>] ? stub_clone+0x69/0x90 Mar 8 18:12:51 kernel: [ 2009.568838] [<ffffffff814adb39>] ? system_call_fastpath+0x16/0x1b Mar 8 18:12:51 kernel: [ 2009.568843] ---[ end trace 627af7edfbb43119 ]--- Mar 8 18:13:23 kernel: [ 2041.956215] ------------[ cut here ]------------ Mar 8 18:13:23 kernel: [ 2041.956264] WARNING: CPU: 1 PID: 1264 at /build/linux-UvfduQ/linux-3.13.5/fs/btrfs/ctree.c:5246 btrfs_compare_trees+0x461/0x960 [btrfs]() Mar 8 18:13:23 kernel: [ 2041.956270] btrfs: btrfs_compare_tree detected a change in one of the trees while iterating. This is probably a bug. Mar 8 18:13:23 kernel: [ 2041.956274] Modules linked in: ext4 crc16 mbcache jbd2 iTCO_wdt coretemp iTCO_vendor_support psmouse serio_raw pcspkr i2c_i801 i2c_core lpc_ich mfd_core joydev evdev processor button thermal_sys raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx md_mod ipmi_si ipmi_devintf ipmi_msghandler autofs4 btrfs xor raid6_pq crc32c libcrc32c sg sd_mod crct10dif_generic crc_t10dif crct10dif_common hid_generic usbhid hid ata_generic ata_piix libata scsi_mod e1000e ptp pps_core ehci_pci uhci_hcd ehci_hcd usbcore usb_common Mar 8 18:13:23 kernel: [ 2041.956358] CPU: 1 PID: 1264 Comm: btrfs Tainted: G W 3.13-1-amd64 #1 Debian 3.13.5-1 Mar 8 18:13:23 kernel: [ 2041.956363] Hardware name: Supermicro X7SPA-HF/X7SPA-HF, BIOS 1.2a 02/21/12 Mar 8 18:13:23 kernel: [ 2041.956368] 0000000000000009 ffffffff814a0927 ffff8800b4df7bc8 ffffffff8105ba72 Mar 8 18:13:23 kernel: [ 2041.956380] ffff8800ba272100 ffff8800b4df7c18 ffff8800b920f000 0000000000000001 Mar 8 18:13:23 kernel: [ 2041.956389] 0000000000000000 ffffffff8105bad7 ffffffffa0225c70 ffffffff00000018 Mar 8 18:13:23 kernel: [ 2041.956399] Call Trace: Mar 8 18:13:23 kernel: [ 2041.956414] [<ffffffff814a0927>] ? dump_stack+0x41/0x51 Mar 8 18:13:23 kernel: [ 2041.956426] [<ffffffff8105ba72>] ? warn_slowpath_common+0x72/0x90 Mar 8 18:13:23 kernel: [ 2041.956435] [<ffffffff8105bad7>] ? warn_slowpath_fmt+0x47/0x50 Mar 8 18:13:23 kernel: [ 2041.956468] [<ffffffffa0195a61>] ? btrfs_compare_trees+0x461/0x960 [btrfs] Mar 8 18:13:23 kernel: [ 2041.956504] [<ffffffffa0213920>] ? process_extent+0x1130/0x1130 [btrfs] Mar 8 18:13:23 kernel: [ 2041.956542] [<ffffffffa0214b20>] ? btrfs_ioctl_send+0x830/0xbc0 [btrfs] Mar 8 18:13:23 kernel: [ 2041.956554] [<ffffffff8111eee9>] ? __alloc_pages_nodemask+0x149/0x9d0 Mar 8 18:13:23 kernel: [ 2041.956589] [<ffffffffa01e4b6a>] ? btrfs_ioctl+0xfca/0x25d0 [btrfs] Mar 8 18:13:23 kernel: [ 2041.956600] [<ffffffff8108706c>] ? set_task_cpu+0x5c/0x160 Mar 8 18:13:23 kernel: [ 2041.956612] [<ffffffff8126f860>] ? cpumask_next_and+0x30/0x40 Mar 8 18:13:23 kernel: [ 2041.956621] [<ffffffff8108d4ef>] ? select_task_rq_fair+0x2af/0x6f0 Mar 8 18:13:23 kernel: [ 2041.956631] [<ffffffff8101981f>] ? native_sched_clock+0xf/0x70 Mar 8 18:13:23 kernel: [ 2041.956641] [<ffffffff8108f827>] ? enqueue_task_fair+0x2c7/0xe10 Mar 8 18:13:23 kernel: [ 2041.956650] [<ffffffff81086e25>] ? check_preempt_curr+0x65/0x90 Mar 8 18:13:23 kernel: [ 2041.956661] [<ffffffff81088c45>] ? wake_up_new_task+0xd5/0x160 Mar 8 18:13:23 kernel: [ 2041.956672] [<ffffffff8118b5bf>] ? do_vfs_ioctl+0x2cf/0x4a0 Mar 8 18:13:23 kernel: [ 2041.956681] [<ffffffff8118b810>] ? SyS_ioctl+0x80/0xa0 Mar 8 18:13:23 kernel: [ 2041.956691] [<ffffffff814ade99>] ? stub_clone+0x69/0x90 Mar 8 18:13:23 kernel: [ 2041.956701] [<ffffffff814adb39>] ? system_call_fastpath+0x16/0x1b Mar 8 18:13:23 kernel: [ 2041.956707] ---[ end trace 627af7edfbb4311a ]--- Cheers, -- TC -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html