Re: exportfs: /anyfolder does not support NFS export

nfs processes shutdown.

strace only of command exportfs:

root@debian:~# strace exportfs -a
execve("/usr/sbin/exportfs", ["exportfs", "-a"], [/* 14 vars */]) = 0
brk(0)                                  = 0xbc7000
uname({sys="Linux", node="debian", ...}) = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6fed000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=11876, ...}) = 0
mmap2(NULL, 11876, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb6fea000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/arm-linux-gnueabi/libwrap.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\204\"\0\0004\0\0\0"..., 512) = 512
lseek(3, 30004, SEEK_SET)               = 30004
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
lseek(3, 29752, SEEK_SET)               = 29752
read(3, "A+\0\0\0aeabi\0\1!\0\0\0\0054T\0\6\2\10\1\t\1\22\4\24\1\25\1"..., 44) = 44
fstat64(3, {st_mode=S_IFREG|0644, st_size=31004, ...}) = 0
mmap2(NULL, 64960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6fb8000
mprotect(0xb6fbf000, 28672, PROT_NONE)  = 0
mmap2(0xb6fc6000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6) = 0xb6fc6000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/arm-linux-gnueabi/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0d\202\1\0004\0\0\0"..., 512) = 512
lseek(3, 1240084, SEEK_SET)             = 1240084
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2840) = 2840
lseek(3, 1236484, SEEK_SET)             = 1236484
read(3, "A)\0\0\0aeabi\0\1\37\0\0\0\0054T\0\6\2\10\1\t\1\22\4\23\1\24\1"..., 42) = 42
fstat64(3, {st_mode=S_IFREG|0755, st_size=1242924, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6fe9000
mmap2(NULL, 1279368, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6e7f000
mprotect(0xb6fab000, 28672, PROT_NONE)  = 0
mmap2(0xb6fb2000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12b) = 0xb6fb2000
mmap2(0xb6fb5000, 9608, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6fb5000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/arm-linux-gnueabi/libnsl.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0@/\0\0004\0\0\0"..., 512) = 512
lseek(3, 70460, SEEK_SET)               = 70460
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1160) = 1160
lseek(3, 70136, SEEK_SET)               = 70136
read(3, "A)\0\0\0aeabi\0\1\37\0\0\0\0054T\0\6\2\10\1\t\1\22\4\23\1\24\1"..., 42) = 42
fstat64(3, {st_mode=S_IFREG|0644, st_size=71620, ...}) = 0
mmap2(NULL, 112384, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6e63000
mprotect(0xb6e74000, 28672, PROT_NONE)  = 0
mmap2(0xb6e7b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10) = 0xb6e7b000
mmap2(0xb6e7d000, 5888, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6e7d000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6fe8000
set_tls(0xb6fe84c0, 0xb6fe8b98, 0xb6ff0050, 0xb6fe84c0, 0xb6ff0050) = 0
mprotect(0xb6fb2000, 8192, PROT_READ)   = 0
mprotect(0xb6e7b000, 4096, PROT_READ)   = 0
mprotect(0xb6fc6000, 4096, PROT_READ)   = 0
mprotect(0xb6fef000, 4096, PROT_READ)   = 0
munmap(0xb6fea000, 11876)               = 0
getpid()                                = 2835
rt_sigaction(SIGUSR1, {0xfb0c, [USR1], SA_RESTART|0x4000000}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGUSR2, {0xfb0c, [USR2], SA_RESTART|0x4000000}, {SIG_DFL, [], 0}, 8) = 0
access("/proc/fs/nfs/filehandle", F_OK) = -1 ENOENT (No such file or directory)


access("/proc/fs/nfsd/filehandle", F_OK) = 0

open("/var/lib/nfs/export-lock", O_RDWR|O_CREAT|O_LARGEFILE, 0666) = 3
fcntl64(3, F_SETLKW64, {type=F_WRLCK, whence=SEEK_CUR, start=0, len=0}, 0xbeffbbe8) = 0
brk(0)                                  = 0xbc7000
brk(0xbe8000)                           = 0xbe8000
open("/etc/exports", O_RDONLY|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=478, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6fec000
read(4, "# /etc/exports: the access contr"..., 1024) = 478
open("/proc/fs/nfsd/export_features", O_RDONLY|O_LARGEFILE) = 5
read(5, "0x17e3f 0xf\n", 50)            = 12
close(5)                                = 0
lstat64("/usr", {st_mode=S_IFDIR|0755, st_size=1024, ...}) = 0
lstat64("/usr/src", {st_mode=S_IFDIR|0755, st_size=1024, ...}) = 0
read(4, "", 1024)                       = 0
read(4, "", 1024)                       = 0
close(4)                                = 0
munmap(0xb6fec000, 4096)                = 0
openat(AT_FDCWD, "/etc/exports.d", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat64("/usr/src", {st_mode=S_IFDIR|0755, st_size=1024, ...}) = 0
open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY|O_LARGEFILE) = 4
write(4, "nfsd 0.0.0.0 2147483647 -test-cl"..., 38) = 38
close(4)                                = 0
open("/proc/net/rpc/nfsd.export/channel", O_WRONLY|O_LARGEFILE) = 4
close(4)                                = 0
statfs64("/usr/src", 88, {f_type="EXT2_SUPER_MAGIC", f_bsize=1024, f_blocks=452442, f_bfree=71103, f_bavail=47321, f_files=118944, f_ffree=100934, f_fsid={2147225750, -1093875100}, f_namelen=255, f_frsize=1024}) = 0
open("/proc/net/rpc/nfsd.export/channel", O_WRONLY|O_LARGEFILE) = 4

write(4, "-test-client- /usr/src 3 8192 -1"..., 38) = -1 ENOENT (No such file or directory)

close(4)                                = 0
write(2, "exportfs: ", 10exportfs: )              = 10
write(2, "/usr/src does not support NFS ex"..., 36/usr/src does not support NFS export) = 36

....now now exportfs knows that sth is wrong ....

the rest is cleaning, flushing, closing...



full line (strace -s999):
  write(4, "-test-client- /usr/src 3 8192 -1 -1 0\n", 38) = -1 ENOENT (No such file or directory)

definition of open function:
      int open(const char *pathname, int flags);int open(const char *pathname,
Given a pathname for a file, open() returns a file descriptor, a small, nonnegative integer for use in subsequent system calls (read(2), write(2), lseek(2), fcntl(2), etc.). The file descriptor returned by a successful call will be the lowest-numbered file descriptor not currently open for the process


what is "-test client-" ???? 




root@debian:~# cat /proc/fs/nfsd/export_features 
0x17e3f 0xf
root@debian:~# cat /proc/net/rpc/nfsd.export/channel
root@debian:~# cat /proc/net/rpc/auth.unix.ip/channel 
root@debian:~# grep 'test-client' /etc/ -r
root@debian:~#


root@debian:~# ls /var/lib/nfs/ -l
total 8
drwxr-xr-x  6 statd nogroup 1024 Jan  1 01:06 .
drwxr-xr-x 22 root  root    1024 Jan  1 01:02 ..
-rw-------  1 root  root       0 Jan  1 01:01 .etab.lock
-rw-r--r--  1 root  root     167 Jan  1 01:01 etab
-rw-r--r--  1 root  root       0 Jan  1 01:05 export-lock
-rw-r--r--  1 root  root       0 May 22  2013 rmtab
drwxr-xr-x  2 statd nogroup 1024 May 22  2013 rpc_pipefs
drwxr-xr-x  2 statd nogroup 1024 May 22  2013 sm
drwxr-xr-x  2 statd nogroup 1024 May 22  2013 sm.bak
-rw-r--r--  1 root  root       4 Jan  1 01:02 state
drwxr-xr-x  2 root  root    1024 May 22  2013 v4recovery
-rw-r--r--  1 root  root       0 May 22  2013 xtab

root@debian:~# cat /var/lib/nfs/etab 
/usr/src	192.168.0.0/255.255.255.0(rw,sync,wdelay,hide,nocrossmnt,insecure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,anonuid=65534,anongid=65534)
root@debian:~# 




When I started up all nfs processes 
munmap(0xb6f77000, 4096)                = 0
openat(AT_FDCWD, "/etc/exports.d", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat64("/usr/src", {st_mode=S_IFDIR|0755, st_size=1024, ...}) = 0
open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY|O_LARGEFILE) = 4
write(4, "nfsd 0.0.0.0 2147483647 -test-client-\n", 38) = 38
close(4)                                = 0
open("/proc/net/rpc/nfsd.export/channel", O_WRONLY|O_LARGEFILE) = 4
close(4)                                = 0
statfs64("/usr/src", 88, {f_type="EXT2_SUPER_MAGIC", f_bsize=1024, f_blocks=452442, f_bfree=71105, f_bavail=47323, f_files=118944, f_ffree=100933, f_fsid={2147225750, -1093875100}, f_namelen=255, f_frsize=1024}) = 0
open("/proc/net/rpc/nfsd.export/channel", O_WRONLY|O_LARGEFILE) = 4
write(4, "-test-client- /usr/src 3 8192 -1 -1 0\n", 38) = -1 ENOENT (No such file or directory)
close(4)                                = 0
write(2, "exportfs: ", 10exportfs: )              = 10
write(2, "/usr/src does not support NFS export", 36/usr/src does not support NFS export) = 36
write(2, "\n", 1

...so this is the same...

similar problem years ago...
http://markmail.org/message/hhnzko3hmkgxm65o#query:+page:1+mid:m5mxxrd3dhrf7a5e+state:results
..and quote:
"And I guess a boot-time related problem could be hardware dependent somehow."

So...u-boot is strongly suspected...

root@debian:~# fw_printenv 
Warning: Bad CRC, using default environment
bootcmd=bootp; setenv bootargs root=/dev/nfs nfsroot=${serverip}:${rootpath} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; bootm
bootdelay=5
baudrate=115200
root@debian:~#