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LQ Newbie
Registered: Dec 2008
Location: Russia
Distribution: Debian
Posts: 3
Rep: 
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Serial console hangs.
Hi.
Ubuntu Server 8.04 is working on server with USB and RS-232 bus. Need to work with some net devices via serial console. Some net devices are cisco router and ZyXEL switch. One device connected directly to RS-232 port and other - via RS-232 - USB converter to USB port. It is no problem in switch, router or cabels: they are working fine on other host with FreeBSD installed. Unlikely that problem is in hardware port on server with ubuntu: the same symptoms for both connections (USB and RS232).
When I try to connect with cu, it writes "Connected." and hangs.
Here is some console i/o:
root@ubuntu:~# uname -rvpio
2.6.24-19-server #1 SMP Wed Jun 18 14:44:47 UTC 2008 unknown unknown GNU/Linux
root@ubuntu:~# dmesg | grep -i serial
[ 80.843296] Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
[ 80.843404] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[297235.670539] usbcore: registered new interface driver usbserial
[297235.670552] /build/buildd/linux-2.6.24/drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
[297235.670571] usbcore: registered new interface driver usbserial_generic
[297235.670572] /build/buildd/linux-2.6.24/drivers/usb/serial/usb-serial.c: USB Serial Driver core
[297235.671656] /build/buildd/linux-2.6.24/drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
[297235.671768] /build/buildd/linux-2.6.24/drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver
root@ubuntu:~# ls -l /dev/tty{S,USB}0
crwxrwxrwx 1 root root 4, 64 2009-05-19 13:45 /dev/ttyS0
crwxrwxrwx 1 root dialout 188, 0 2009-05-25 12:01 /dev/ttyUSB0
root@ubuntu:~# stty -F /dev/ttyUSB0
speed 115200 baud; line = 0;
min = 1; time = 5;
ignbrk -brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
root@ubuntu:~# stty -F /dev/ttyS0
speed 9600 baud; line = 0;
min = 1; time = 5;
ignbrk -brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
root@ubuntu:~# setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4
Baud_base: 9600, close_delay: 50, divisor: 1
closing_wait: 3000
Flags: spd_normal skip_test
root@ubuntu:~# cu -s 115200 -l /dev/ttyUSB0
Connected.
It hangs on this step. No visible reaction on keyboard input.
root@ubuntu:~# strace cu -s 115200 -l /dev/ttyUSB0
.
.
.
close(1021) = -1 EBADF (Bad file descriptor)
close(1022) = -1 EBADF (Bad file descriptor)
close(1023) = -1 EBADF (Bad file descriptor)
fcntl(0, F_GETFD) = 0
fcntl(1, F_GETFD) = 0
fcntl(2, F_GETFD) = 0
uname({sys="Linux", node="ubuntu", ...}) = 0
umask(0) = 022
socket(PF_FILE, SOCK_STREAM, 0) = 3
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
socket(PF_FILE, SOCK_STREAM, 0) = 3
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
open("/etc/nsswitch.conf", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=475, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9a2a422000
read(3, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 475
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f9a2a422000, 4096) = 0
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=11800, ...}) = 0
mmap(NULL, 11800, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9a2a420000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/libnss_compat.so.2", 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@\23\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=35632, ...}) = 0
mmap(NULL, 2131184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9a29a85000
mprotect(0x7f9a29a8d000, 2093056, PROT_NONE) = 0
mmap(0x7f9a29c8c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f9a29c8c000
close(3) = 0
munmap(0x7f9a2a420000, 11800) = 0
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=11800, ...}) = 0
mmap(NULL, 11800, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9a2a420000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/libnss_nis.so.2", 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 \0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=43480, ...}) = 0
mmap(NULL, 2139352, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9a2987a000
mprotect(0x7f9a29884000, 2093056, PROT_NONE) = 0
mmap(0x7f9a29a83000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x9000) = 0x7f9a29a83000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/libnss_files.so.2", 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\360\37\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=47528, ...}) = 0
mmap(NULL, 2143528, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9a2966e000
mprotect(0x7f9a29678000, 2097152, PROT_NONE) = 0
mmap(0x7f9a29878000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7f9a29878000
close(3) = 0
munmap(0x7f9a2a420000, 11800) = 0
open("/etc/passwd", O_RDONLY|0x80000 /* O_??? */) = 3
fcntl(3, F_GETFD) = 0x1 (flags FD_CLOEXEC)
lseek(3, 0, SEEK_CUR) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=1358, ...}) = 0
mmap(NULL, 1358, PROT_READ, MAP_SHARED, 3, 0) = 0x7f9a2a422000
lseek(3, 1358, SEEK_SET) = 1358
munmap(0x7f9a2a422000, 1358) = 0
close(3) = 0
getuid() = 0
geteuid() = 0
open("/etc/passwd", O_RDONLY|0x80000 /* O_??? */) = 3
lseek(3, 0, SEEK_CUR) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=1358, ...}) = 0
mmap(NULL, 1358, PROT_READ, MAP_SHARED, 3, 0) = 0x7f9a2a422000
lseek(3, 1358, SEEK_SET) = 1358
munmap(0x7f9a2a422000, 1358) = 0
close(3) = 0
setuid(10) = 0
rt_sigaction(SIGINT, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {0x40ea30, [], SA_RESTORER|SA_INTERRUPT, 0x7f9a29cc0100}, NULL, 8) = 0
rt_sigaction(SIGHUP, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGHUP, {0x40ea30, [], SA_RESTORER|SA_INTERRUPT, 0x7f9a29cc0100}, NULL, 8) = 0
rt_sigaction(SIGQUIT, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGQUIT, {0x40ea30, [], SA_RESTORER|SA_INTERRUPT, 0x7f9a29cc0100}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTERM, {0x40ea30, [], SA_RESTORER|SA_INTERRUPT, 0x7f9a29cc0100}, NULL, 8) = 0
rt_sigaction(SIGPIPE, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGPIPE, {0x40ea30, [], SA_RESTORER|SA_INTERRUPT, 0x7f9a29cc0100}, NULL, 8) = 0
open("/etc/uucp/port", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/uucp/L-devices", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/uucp/Devices", O_RDONLY) = -1 ENOENT (No such file or directory)
creat("/var/lock/TMP0000000b92", 0644) = 3
write(3, " 2962\n", 11) = 11
close(3) = 0
link("/var/lock/TMP0000000b92", "/var/lock/LCK..ttyUSB0") = 0
unlink("/var/lock/TMP0000000b92") = 0
geteuid() = 10
getuid() = 10
getegid() = 0
getgid() = 0
setregid(0, 0) = 0
setreuid(10, 10) = 0
open("/dev/ttyUSB0", O_RDWR|O_NONBLOCK) = 3
geteuid() = 10
getuid() = 10
getegid() = 0
getgid() = 0
setregid(0, 0) = 0
setreuid(10, 10) = 0
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
access("/dev/ttyUSB0", R_OK|W_OK) = 0
fcntl(3, F_GETFL) = 0x8802 (flags O_RDWR|O_NONBLOCK|O_LARGEFILE)
fcntl(3, F_SETFL, O_RDWR|O_LARGEFILE) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, TCFLSH, 0) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_START or TCSETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, TIOCSCTTY) = -1 EPERM (Operation not permitted)
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_START or TCSETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_STOP or TCSETSW, {B115200 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 -opost -isig -icanon -echo ...}) = 0
access("/dev/ttyUSB0", R_OK|W_OK) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9a2a422000
write(1, "\7Connected.\n", 12Connected.
) = 12
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, SNDCTL_TMR_START or TCSETS, {B38400 -opost -isig -icanon -echo ...}) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 -opost -isig -icanon -echo ...}) = 0
pipe([4, 5]) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f9a2a41e770) = 2963
close(5) = 0
read(0, "\3", 1) = 1
write(3, "\3", 1) = 1
read(0, "\3", 1) = 1
write(3, "\3", 1) = 1
read(0, "\3", 1) = 1
write(3, "\3", 1) = 1
read(0,
Now I can see reaction on input:
read(0, "\r", 1) = 1
write(3, "\r", 1) = 1
read(0, "\33", 1) = 1
write(3, "\33", 1) = 1
But ^C (and other hotkeys) doesn't terminate session:
read(0, "\3", 1) = 1
write(3, "\3", 1) = 1
I've tried to use minicom and every possible parameters of setserial - same results.
If some additional information needed, I'll provide it.
Will be very gratefull for any help.
P.S. Sorry for my English :].
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