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프로그램이 cifs 마운트에서 자체 실행 파일을 읽을 때 EOF가 없습니다.

tag-icon • tag-icon samba dd cifs oracle-linux
프로그램이 cifs 마운트에서 자체 실행 파일을 읽을 때 EOF가 없습니다.

내 Java 기반 설치 프로그램이 대상 디렉터리에 자체를 복사할 수 없어 모든 디스크 공간을 차지합니다. Java 버그라고 생각했지만 일반 dd.

충분히 큰 버퍼(131072)를 사용하여 내 실행 파일을 읽으려고 하면 읽기 작업이 갑자기 실제 파일 크기보다 큰 값을 반환하고 EOF를 반환하지 않습니다.

DD=/media/distr/dd
(
/bin/cp /bin/dd $DD
$DD bs=131071 if=$DD of=/dev/null count=20
$DD bs=131072 if=$DD of=/dev/null count=20
)
0+1 records in
0+1 records out
55256 bytes (55 kB) copied, 0.00211071 s, 26.2 MB/s
20+0 records in
20+0 records out
2621440 bytes (2.6 MB) copied, 0.0194318 s, 135 MB/s

samba서버와 cifs마운트가 모두 Oracle Linux 6.6에서 실행되는 경우에만 samba 3.6.23-12.0.1.el6.

그것은 무엇입니까? 커널, cifs 또는 삼바 오류?

dd 추적:

[root@ec-stage-db-2 ~]# strace $DD bs=131072 if=$DD of=/dev/null count=20
execve("/mnt/dd", ["/mnt/dd", "bs=131072", "if=/mnt/dd", "of=/dev/null", "count=20"], [/* 32 vars */]) = 0
brk(0)                                  = 0x13e8000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcc172ee000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=79239, ...}) = 0
mmap(NULL, 79239, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fcc172da000
close(3)                                = 0
open("/lib64/librt.so.1", O_RDONLY)     = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@!\3002=\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=47104, ...}) = 0
mmap(0x3d32c00000, 2128816, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3d32c00000
mprotect(0x3d32c07000, 2093056, PROT_NONE) = 0
mmap(0x3d32e06000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x3d32e06000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY)      = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\356\3011=\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1926760, ...}) = 0
mmap(0x3d31c00000, 3750152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3d31c00000
mprotect(0x3d31d8a000, 2097152, PROT_NONE) = 0
mmap(0x3d31f8a000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18a000) = 0x3d31f8a000
mmap(0x3d31f8f000, 18696, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3d31f8f000
close(3)                                = 0
open("/lib64/libpthread.so.0", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340]\0002=\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=145896, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcc172d9000
mmap(0x3d32000000, 2212848, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3d32000000
mprotect(0x3d32017000, 2097152, PROT_NONE) = 0
mmap(0x3d32217000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x3d32217000
mmap(0x3d32219000, 13296, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3d32219000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcc172d8000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcc172d7000
arch_prctl(ARCH_SET_FS, 0x7fcc172d8700) = 0
mprotect(0x3d32e06000, 4096, PROT_READ) = 0
mprotect(0x3d31f8a000, 16384, PROT_READ) = 0
mprotect(0x3d32217000, 4096, PROT_READ) = 0
mprotect(0x3d3161f000, 4096, PROT_READ) = 0
munmap(0x7fcc172da000, 79239)           = 0
set_tid_address(0x7fcc172d89d0)         = 39608
set_robust_list(0x7fcc172d89e0, 0x18)   = 0
futex(0x7fffa32a778c, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7fffa32a778c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1, NULL, 7fcc172d8700) = -1 EAGAIN (Resource temporarily unavailable)
rt_sigaction(SIGRTMIN, {0x3d32005c60, [], SA_RESTORER|SA_SIGINFO, 0x3d3200f710}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x3d32005cf0, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x3d3200f710}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
rt_sigaction(SIGUSR1, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGUSR1, {0x401be0, [INT USR1], SA_RESTORER, 0x3d31c326a0}, NULL, 8) = 0
rt_sigaction(SIGINT, {0x401bd0, [INT USR1], SA_RESTORER|SA_NODEFER|SA_RESETHAND, 0x3d31c326a0}, NULL, 8) = 0
brk(0)                                  = 0x13e8000
brk(0x1409000)                          = 0x1409000
open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=99158576, ...}) = 0
mmap(NULL, 99158576, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fcc11446000
close(3)                                = 0
open("/mnt/dd", O_RDONLY)               = 3
dup2(3, 0)                              = 0
close(3)                                = 0
lseek(0, 0, SEEK_CUR)                   = 0
open("/dev/null", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
dup2(3, 1)                              = 1
close(3)                                = 0
mmap(NULL, 143360, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcc11423000
read(0, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\2\0>\0\1\0\0\0\340\32@\0\0\0\0\0"..., 131072) = 131072
write(1, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\2\0>\0\1\0\0\0\340\32@\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
read(0, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072
close(0)                                = 0
close(1)                                = 0
open("/usr/share/locale/locale.alias", O_RDONLY) = 0
fstat(0, {st_mode=S_IFREG|0644, st_size=2512, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcc172ed000
read(0, "# Locale name alias data base.\n#"..., 4096) = 2512
read(0, "", 4096)                       = 0
close(0)                                = 0
munmap(0x7fcc172ed000, 4096)            = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = 0
fstat(0, {st_mode=S_IFREG|0644, st_size=435, ...}) = 0
mmap(NULL, 435, PROT_READ, MAP_PRIVATE, 0, 0) = 0x7fcc172ed000
close(0)                                = 0
write(2, "20+0 records in\n20+0 records out"..., 3320+0 records in
20+0 records out
) = 33
write(2, "2621440 bytes (2.6 MB) copied", 292621440 bytes (2.6 MB) copied) = 29
write(2, ", 0.0245485 s, 107 MB/s\n", 24, 0.0245485 s, 107 MB/s
) = 24
close(2)                                = 0
exit_group(0)                           = ?

답변1

동일한 시스템에서 다른 파일 시스템을 사용하여 문제를 재현할 수 없다고 가정하면 이는 삼바 버그임에 틀림없습니다.

클라이언트 문제인지 서버 문제인지는 논쟁의 여지가 있지만 매핑을 실행하고 읽기 위해 동일한 파일을 여는 것과 관련이 있는 것 같습니다. 읽기 호출이 반환되지 않아야 하기 때문에 잘못 처리될 수 있습니다. eof 너머의 모든 것. 잘못된 파일 메타데이터(예: 크기)로 인해 이러한 유형의 동작이 발생할 수도 있습니다.

답변2

테스트 스크립트를 완료하세요. 비용을 지불해야 하기 때문에 버그를 신고할 수 없습니다.

#!/bin/bash

set -e

# systemd
#SMB_START="systemctl start smbd.service nmbd.service"
#SMB_RELOAD="systemctl reload smbd.service"

# initscripts
SMB_START="service smb start"
SMB_RELOAD="service smb reload"

cleanup() {
echo cleanup... >&2
sed -i -n -e "/# added by test-samba-bug BEGIN/b m10; p; b" -e :m10 -e n -e "/# added by test-samba-bug END/b" -e "b m10" /etc/samba/smb.conf
umount -f /tmp/test-samba-bug-mnt 2>/dev/null || true
rm -rf /tmp/test-samba-bug /tmp/test-samba-bug-mnt
}

cleanup

trap cleanup EXIT

mkdir -p /tmp/test-samba-bug /tmp/test-samba-bug-mnt
chcon -R -t samba_share_t /tmp/test-samba-bug 2>/dev/null || true

>>/etc/samba/smb.conf cat <<EOF
# added by test-samba-bug BEGIN
[test-samba-bug]
        path = /tmp/test-samba-bug
        public = yes
# added by test-samba-bug END
EOF

# service smb stop
$SMB_START
$SMB_RELOAD

mount -t cifs -oguest //localhost/test-samba-bug /tmp/test-samba-bug-mnt

command cp /bin/dd /tmp/test-samba-bug/

DD=/tmp/test-samba-bug-mnt/dd

#$DD bs=131071 if=$DD of=/dev/null count=20
$DD bs=131072 if=$DD of=/tmp/test-samba-bug/copied count=20

echo comparing copied file contents
cmp /bin/dd /tmp/test-samba-bug/copied || {
echo "test failed" >&2
exit 1
}

관련 정보