Here the output of strace
# strace /bin/btrfs send -e -p
/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-10_10:00:26.daily
/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.manual
ly.part
-f trans.btrfs -v --no-data
execve("/bin/btrfs", ["/bin/btrfs", "send", "-e", "-p",
"/var/cache/btrfs_pool_SYSTEM/@de"...,
"/var/cache/btrfs_pool_SYSTEM/@de"..., "-f", "trans.btrfs", "-v",
"--no-data"], [/* 24 vars */]) = 0
brk(NULL) = 0x1efc000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0)
= 0x7f22ab18f000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=148788, ...}) = 0
mmap(NULL, 148788, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f22ab16a000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/x86_64-linux-gnu/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\25\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=19008, ...}) = 0
mmap(NULL, 2113936, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f22aad69000
mprotect(0x7f22aad6d000, 2093056, PROT_NONE) = 0
mmap(0x7f22aaf6c000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f22aaf6c000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/x86_64-linux-gnu/libblkid.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\215\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=271112, ...}) = 0
mmap(NULL, 2370272, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f22aab26000
mprotect(0x7f22aab63000, 2097152, PROT_NONE) = 0
mmap(0x7f22aad63000, 20480, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3d000) = 0x7f22aad63000
mmap(0x7f22aad68000, 2784, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f22aad68000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/x86_64-linux-gnu/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0
\"\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=109144, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0)
= 0x7f22ab169000
mmap(NULL, 2204200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f22aa90b000
mprotect(0x7f22aa925000, 2093056, PROT_NONE) = 0
mmap(0x7f22aab24000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19000) = 0x7f22aab24000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/x86_64-linux-gnu/liblzo2.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0&\0\0\0\0\0\0"...,
832)
= 832
fstat(3, {st_mode=S_IFREG|0644, st_size=137296, ...}) = 0
mmap(NULL, 2232560, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f22aa6e9000
mprotect(0x7f22aa70a000, 2093056, PROT_NONE) = 0
mmap(0x7f22aa909000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x20000) = 0x7f22aa909000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0a\0\0\0\0\0\0"...,
832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=135744, ...}) = 0
mmap(NULL, 2212904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f22aa4cc000
mprotect(0x7f22aa4e4000, 2093056, PROT_NONE) = 0
mmap(0x7f22aa6e3000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f22aa6e3000
mmap(0x7f22aa6e5000, 13352, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f22aa6e5000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or
directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\10\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1697504, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0)
= 0x7f22ab168000
mmap(NULL, 3803552, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f22aa12b000
mprotect(0x7f22aa2c2000, 2097152, PROT_NONE) = 0
mmap(0x7f22aa4c2000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x197000) = 0x7f22aa4c2000
mmap(0x7f22aa4c8000, 14752, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f22aa4c8000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0)
= 0x7f22ab167000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0)
= 0x7f22ab165000
arch_prctl(ARCH_SET_FS, 0x7f22ab1658c0) = 0
mprotect(0x7f22aa4c2000, 16384, PROT_READ) = 0
mprotect(0x7f22aa6e3000, 4096, PROT_READ) = 0
mprotect(0x7f22aa909000, 4096, PROT_READ) = 0
mprotect(0x7f22aab24000, 4096, PROT_READ) = 0
mprotect(0x7f22aaf6c000, 4096, PROT_READ) = 0
mprotect(0x7f22aad63000, 16384, PROT_READ) = 0
mprotect(0x681000, 16384, PROT_READ) = 0
mprotect(0x7f22ab191000, 4096, PROT_READ) = 0
munmap(0x7f22ab16a000, 148788) = 0
set_tid_address(0x7f22ab165b90) = 18744
set_robust_list(0x7f22ab165ba0, 24) = 0
rt_sigaction(SIGRTMIN, {0x7f22aa4d1ba0, [], SA_RESTORER|SA_SIGINFO,
0x7f22aa4dced0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x7f22aa4d1c30, [],
SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7f22aa4dced0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY})
= 0
brk(NULL) = 0x1efc000
brk(0x1f1e000) = 0x1f1e000
lstat("/var", {st_mode=S_IFDIR|0755, st_size=128, ...}) = 0
lstat("/var/cache", {st_mode=S_IFDIR|0755, st_size=730, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM", {st_mode=S_IFDIR|0755,
st_size=9440, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-10_10:00:26
.daily",
{st_mode=S_IFDIR|0755, st_size=360, ...}) = 0
openat(0,
"/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-10_10:00:26.daily
",
O_RDONLY|O_NOATIME) = 3
ioctl(3, BTRFS_IOC_SUBVOL_GETFLAGS, BTRFS_SUBVOL_RDONLY) = 0
close(3) = 0
creat("trans.btrfs", 0600) = 3
ioctl(3, TCGETS, 0x7ffdf0af95b0) = -1 ENOTTY (Inappropriate
ioctl
for device)
lstat("/var", {st_mode=S_IFDIR|0755, st_size=128, ...}) = 0
lstat("/var/cache", {st_mode=S_IFDIR|0755, st_size=730, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM", {st_mode=S_IFDIR|0755,
st_size=9440, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42
.manually.part",
{st_mode=S_IFDIR|0755, st_size=360, ...}) = 0
open("/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.
manually.part",
O_RDONLY|O_NOATIME) = 4
close(4) = 0
open("/proc/self/mounts", O_RDONLY|O_CLOEXEC) = 4
futex(0x7f22aa4c9008, FUTEX_WAKE_PRIVATE, 2147483647) = 0
fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(4, "sysfs /sys sysfs rw,nosuid,nodev"..., 1024) = 1024
read(4, " cgroup rw,nosuid,nodev,noexec,r"..., 1024) = 1024
read(4, "e=437,iocharset=utf8,shortname=m"..., 1024) = 1024
read(4, "e,subvolid=262,subvol=/__ALWAYSC"..., 1024) = 1024
read(4, "RRENT__/var-log 0 0\n/dev/sda3 /h"..., 1024) = 1024
read(4, "ackup-local btrfs ro,relatime,co"..., 1024) = 558
read(4, "", 1024) = 0
close(4) = 0
lstat("/var", {st_mode=S_IFDIR|0755, st_size=128, ...}) = 0
lstat("/var/cache", {st_mode=S_IFDIR|0755, st_size=730, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM", {st_mode=S_IFDIR|0755,
st_size=9440, ...}) = 0
open("/var/cache/btrfs_pool_SYSTEM", O_RDONLY|O_NOATIME) = 4
ioctl(4, BTRFS_IOC_TREE_SEARCH, {key={tree_id=1 /*
BTRFS_ROOT_TREE_OBJECTID */, min_objectid=9 /*
BTRFS_UUID_TREE_OBJECTID
*/, max_objectid=9 /* BTRFS_UUID_TREE_OBJECTID */,
max_offset=18446744073709551615 /* UINT64_MAX */,
max_transid=18446744073709551615 /* UINT64_MAX */, min_type=132 /*
BTRFS_ROOT_ITEM_KEY */, max_type=132 /* BTRFS_ROOT_ITEM_KEY */,
nr_items=1}} => {key={nr_items=1}, buf=...}) = 0
openat(4, "@debian-testing.2016-08-10_10:00:26.daily", O_RDONLY) = 5
ioctl(5, BTRFS_IOC_INO_LOOKUP, {treeid=0, objectid=256 /*
BTRFS_FIRST_FREE_OBJECTID */} => {treeid=15047, name=""}) = 0
close(5) = 0
ioctl(4, BTRFS_IOC_TREE_SEARCH, {key={tree_id=1 /*
BTRFS_ROOT_TREE_OBJECTID */, min_objectid=15047, max_objectid=15047,
max_offset=18446744073709551615 /* UINT64_MAX */,
max_transid=18446744073709551615 /* UINT64_MAX */, min_type=132 /*
BTRFS_ROOT_ITEM_KEY */, max_type=132 /* BTRFS_ROOT_ITEM_KEY */,
nr_items=4096}} => {key={nr_items=1}, buf=...}) = 0
ioctl(4, BTRFS_IOC_TREE_SEARCH, {key={tree_id=1 /*
BTRFS_ROOT_TREE_OBJECTID */, min_objectid=15047, max_objectid=15047,
min_offset=246948, max_offset=18446744073709551615 /* UINT64_MAX */,
max_transid=18446744073709551615 /* UINT64_MAX */, min_type=132 /*
BTRFS_ROOT_ITEM_KEY */, max_type=132 /* BTRFS_ROOT_ITEM_KEY */,
nr_items=1}} => {key={nr_items=0}, buf=...}) = 0
lstat("/var", {st_mode=S_IFDIR|0755, st_size=128, ...}) = 0
lstat("/var/cache", {st_mode=S_IFDIR|0755, st_size=730, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM", {st_mode=S_IFDIR|0755,
st_size=9440, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42
.manually.part",
{st_mode=S_IFDIR|0755, st_size=360, ...}) = 0
open("/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.
manually.part",
O_RDONLY|O_NOATIME) = 5
close(5) = 0
open("/proc/self/mounts", O_RDONLY|O_CLOEXEC) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(5, "sysfs /sys sysfs rw,nosuid,nodev"..., 1024) = 1024
read(5, " cgroup rw,nosuid,nodev,noexec,r"..., 1024) = 1024
read(5, "e=437,iocharset=utf8,shortname=m"..., 1024) = 1024
read(5, "e,subvolid=262,subvol=/__ALWAYSC"..., 1024) = 1024
read(5, "RRENT__/var-log 0 0\n/dev/sda3 /h"..., 1024) = 1024
read(5, "ackup-local btrfs ro,relatime,co"..., 1024) = 558
read(5, "", 1024) = 0
close(5) = 0
lstat("/var", {st_mode=S_IFDIR|0755, st_size=128, ...}) = 0
lstat("/var/cache", {st_mode=S_IFDIR|0755, st_size=730, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM", {st_mode=S_IFDIR|0755,
st_size=9440, ...}) = 0
openat(4,
"/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.manua
lly.part",
O_RDONLY|O_NOATIME) = 5
ioctl(5, BTRFS_IOC_SUBVOL_GETFLAGS, BTRFS_SUBVOL_RDONLY) = 0
close(5) = 0
write(2, "Mode NO_FILE_DATA enabled\n", 26Mode NO_FILE_DATA enabled
) = 26
write(2, "At subvol /var/cache/btrfs_pool_"..., 89At subvol
/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.manual
ly.part
) = 89
lstat("/var", {st_mode=S_IFDIR|0755, st_size=128, ...}) = 0
lstat("/var/cache", {st_mode=S_IFDIR|0755, st_size=730, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM", {st_mode=S_IFDIR|0755,
st_size=9440, ...}) = 0
lstat("/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42
.manually.part",
{st_mode=S_IFDIR|0755, st_size=360, ...}) = 0
openat(4,
"/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.manua
lly.part",
O_RDONLY|O_NOATIME) = 5
ioctl(5, BTRFS_IOC_SUBVOL_GETFLAGS, BTRFS_SUBVOL_RDONLY) = 0
close(5) = 0
openat(4,
"/var/cache/btrfs_pool_SYSTEM/@debian-testing.2016-08-11_00:30:42.manua
lly.part",
O_RDONLY|O_NOATIME) = 5
pipe([6, 7]) = 0
mmap(NULL, 8392704, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f22a992a000
mprotect(0x7f22a992a000, 4096, PROT_NONE) = 0
clone(child_stack=0x7f22aa129e30,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SY
SVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
parent_tidptr=0x7f22aa12a9d0, tls=0x7f22aa12a700,
child_tidptr=0x7f22aa12a9d0) = 18745
ioctl(5, BTRFS_IOC_SEND, {send_fd=7, clone_sources_count=1,
clone_sources=..., parent_root=15047,
flags=BTRFS_SEND_FLAG_NO_FILE_DATA}) = -1 ENOENT (No such file or
directory)
write(2, "ERROR: ", 7ERROR: ) = 7
write(2, "send ioctl failed with -2: No su"..., 52send ioctl failed
with
-2: No such file or directory) = 52
write(2, "\n", 1
) = 1
close(5) = 0
close(6) = 0
close(7) = 0
close(4) = 0
exit_group(1) = ?
+++ exited with 1 +++
