Bug 200445
| Summary: | login into system on serial line /dev/cuaU0 hangs on open of /dev/tty | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Matthias Apitz <guru> |
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | New --- | ||
| Severity: | Affects Only Me | CC: | amvandemore, emaste, guru, kib |
| Priority: | --- | ||
| Version: | CURRENT | ||
| Hardware: | i386 | ||
| OS: | Any | ||
|
Description
Matthias Apitz
2015-05-25 19:08:21 UTC
Does it also fail if you use csh as your login shell, then exec sh from there? (In reply to Ed Maste from comment #1) If you start a /bin/sh after correct login with /bin/csh as login-shell, the /bin/sh hangs as well forever; trussing it, it shows that it hangs in an open(2) syscall for /dev/tty: mmap(0x0,32768,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) = 671612928 (0x28080000) issetugid(0x2807e76c,0xbfbfefc8,0x20,0x0,0x0,0x0) = 0 (0x0) lstat("/etc",{ mode=drwxr-xr-x ,inode=9229440,size=2560,blksize=32768 }) = 0 (0x0) lstat("/etc/libmap.conf",{ mode=-rw-r--r-- ,inode=9229485,size=102,blksize=32768 }) = 0 (0x0) open("/etc/libmap.conf",O_CLOEXEC,00) = 3 (0x3) fstat(3,{ mode=-rw-r--r-- ,inode=9229485,size=102,blksize=32768 }) = 0 (0x0) mmap(0x0,102,PROT_READ,MAP_PRIVATE,3,0x0) = 671645696 (0x28088000) close(3) = 0 (0x0) lstat("/usr",{ mode=drwxr-xr-x ,inode=1364352,size=512,blksize=32768 }) = 0 (0x0) lstat("/usr/local",{ mode=drwxr-xr-x ,inode=1364414,size=512,blksize=32768 }) = 0 (0x0) lstat("/usr/local/etc",{ mode=drwxr-xr-x ,inode=1605894,size=2048,blksize=32768 }) = 0 (0x0) lstat("/usr/local/etc/libmap.d",{ mode=drwxr-xr-x ,inode=2416694,size=512,blksize=32768 }) = 0 (0x0) open("/usr/local/etc/libmap.d",O_NONBLOCK|O_DIRECTORY|O_CLOEXEC,05001762160) = 3 (0x3) __sysctl(0xbfbfd490,0x2,0x2807f170,0xbfbfd48c,0x0,0x0) = 0 (0x0) fstatfs(0x3,0xbfbfd4c8,0x0,0x0,0x0,0x3) = 0 (0x0) munmap(0x28087000,4096) = 0 (0x0) mmap(0x0,40960,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) = 671649792 (0x28089000) getdirentries(0x3,0x2808a000,0x1000,0x28086014,0x28086014,0x2807e470) = 24 (0x18) getdirentries(0x3,0x2808a000,0x1000,0x28086014,0x28086014,0x2807e470) = 0 (0x0) close(3) = 0 (0x0) munmap(0x28088000,102) = 0 (0x0) open("/var/run/ld-elf.so.hints",O_CLOEXEC,00) = 3 (0x3) read(3,"Ehnt\^A\0\0\0\M^@\0\0\0\M-(\0\0"...,128) = 128 (0x80) lseek(3,0x80,SEEK_SET) = 128 (0x80) read(3,"/lib:/usr/lib:/usr/lib/compat:/u"...,168) = 168 (0xa8) close(3) = 0 (0x0) access("/lib/libedit.so.7",0) = 0 (0x0) open("/lib/libedit.so.7",O_CLOEXEC,00) = 3 (0x3) fstat(3,{ mode=-r--r--r-- ,inode=1203856,size=134368,blksize=32768 }) = 0 (0x0) mmap(0x0,4096,PROT_READ,MAP_PRIVATE|MAP_PREFAULT_READ,3,0x0) = 671641600 (0x28087000) mmap(0x0,147456,PROT_NONE,MAP_PRIVATE|MAP_ANON|MAP_NOCORE,-1,0x0) = 671690752 (0x28093000) mmap(0x28093000,131072,PROT_READ|PROT_EXEC,MAP_PRIVATE|MAP_FIXED|MAP_NOCORE|MAP_PREFAULT_READ,3,0x0) = 671690752 (0x28093000) mmap(0x280b3000,8192,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_FIXED|MAP_PREFAULT_READ,3,0x1f000) = 671821824 (0x280b3000) mmap(0x280b5000,8192,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_FIXED|MAP_ANON,-1,0x0) = 671830016 (0x280b5000) munmap(0x28087000,4096) = 0 (0x0) close(3) = 0 (0x0) access("/lib/libc.so.7",0) = 0 (0x0) open("/lib/libc.so.7",O_CLOEXEC,00) = 3 (0x3) fstat(3,{ mode=-r--r--r-- ,inode=1203843,size=1384432,blksize=32768 }) = 0 (0x0) mmap(0x0,4096,PROT_READ,MAP_PRIVATE|MAP_PREFAULT_READ,3,0x0) = 671641600 (0x28087000) mmap(0x0,1409024,PROT_NONE,MAP_PRIVATE|MAP_ANON|MAP_NOCORE,-1,0x0) = 671838208 (0x280b7000) mmap(0x280b7000,1298432,PROT_READ|PROT_EXEC,MAP_PRIVATE|MAP_FIXED|MAP_NOCORE|MAP_PREFAULT_READ,3,0x0) = 671838208 (0x280b7000) mmap(0x281f4000,28672,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_FIXED|MAP_PREFAULT_READ,3,0x13d000) = 673136640 (0x281f4000) mmap(0x281fb000,81920,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_FIXED|MAP_ANON,-1,0x0) = 673165312 (0x281fb000) munmap(0x28087000,4096) = 0 (0x0) close(3) = 0 (0x0) access("/lib/libncursesw.so.8",0) = 0 (0x0) open("/lib/libncursesw.so.8",O_CLOEXEC,00) = 3 (0x3) fstat(3,{ mode=-r--r--r-- ,inode=1203880,size=305200,blksize=32768 }) = 0 (0x0) mmap(0x0,4096,PROT_READ,MAP_PRIVATE|MAP_PREFAULT_READ,3,0x0) = 671641600 (0x28087000) mmap(0x0,307200,PROT_NONE,MAP_PRIVATE|MAP_ANON|MAP_NOCORE,-1,0x0) = 673247232 (0x2820f000) mmap(0x2820f000,294912,PROT_READ|PROT_EXEC,MAP_PRIVATE|MAP_FIXED|MAP_NOCORE|MAP_PREFAULT_READ,3,0x0) = 673247232 (0x2820f000) mmap(0x28257000,12288,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_FIXED|MAP_PREFAULT_READ,3,0x48000) = 673542144 (0x28257000) munmap(0x28087000,4096) = 0 (0x0) close(3) = 0 (0x0) munmap(0x2808e000,20480) = 0 (0x0) mmap(0x0,69632,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) = 673554432 (0x2825a000) sysarch(0xa,0xbfbfe3ac,0x280826e0,0x2807e470,0xbfbfe3d0,0x280669c3) = 0 (0x0) sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) readlink("/etc/malloc.conf",0xbfbfdb47,1024) ERR#2 'No such file or directory' issetugid(0x0,0xbfbfdb47,0x400,0x0,0x0,0x0) = 0 (0x0) mmap(0x0,4194304,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) = 673624064 (0x2826b000) munmap(0x2826b000,4194304) = 0 (0x0) mmap(0x0,8384512,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) = 673624064 (0x2826b000) munmap(0x2826b000,1658880) = 0 (0x0) munmap(0x28800000,2531328) = 0 (0x0) sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) getpid() = 1807 (0x70f) geteuid() = 0 (0x0) getppid() = 1806 (0x70e) mmap(0x0,4194304,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,-1,0x0) = 679477248 (0x28800000) getuid() = 0 (0x0) geteuid() = 0 (0x0) getgid() = 0 (0x0) getegid() = 0 (0x0) ioctl(0,TIOCGETA,0xbfbfec90) = 0 (0x0) ioctl(1,TIOCGETA,0xbfbfec90) = 0 (0x0) sigaction(SIGINT,0x0,{ SIG_DFL SA_RESTART ss_t }) = 0 (0x0) sigaction(SIGINT,{ 0x8060590 0x0 ss_t },0x0) = 0 (0x0) sigaction(SIGQUIT,0x0,{ SIG_DFL SA_RESTART ss_t }) = 0 (0x0) sigaction(SIGQUIT,{ 0x8060590 0x0 ss_t },0x0) = 0 (0x0) sigaction(SIGTERM,0x0,{ SIG_DFL SA_RESTART ss_t }) = 0 (0x0) sigaction(SIGTERM,{ SIG_IGN 0x0 ss_t },0x0) = 0 (0x0) ioctl(0,TIOCGETA,0xbfbfec58) = 0 (0x0) fcntl(0,F_GETFL,) = 2 (0x2) fcntl(1,F_GETFL,) = 2 (0x2) fcntl(2,F_GETFL,) = 2 (0x2) sigprocmask(SIG_BLOCK,SIGWINCH,0x0) = 0 (0x0) ioctl(1,TIOCGETA,0xbfbfdf18) = 0 (0x0) issetugid(0xbfbfdb22,0x2824cc6e,0x3fa,0x1409fc,0x281d89e0,0x2807e470) = 0 (0x0) open("/root/.termcap.db",O_CLOEXEC,00) ERR#2 'No such file or directory' open("/root/.termcap",O_CLOEXEC,00) ERR#2 'No such file or directory' open("/usr/share/misc/termcap.db",O_CLOEXEC,00) = 3 (0x3) fstat(3,{ mode=-r--r--r-- ,inode=1526444,size=1343488,blksize=32768 }) = 0 (0x0) read(3,"\0\^F\^Ua\0\0\0\^B\0\0\^D\M-R\0"...,260) = 260 (0x104) pread(0x3,0x28846000,0x1000,0x4c000,0x0,0x28810060) = 4096 (0x1000) pread(0x3,0x2884f000,0x1000,0x6a000,0x0,0x2807e470) = 4096 (0x1000) pread(0x3,0x28850000,0x1000,0x4000,0x0,0x1) = 4096 (0x1000) close(3) = 0 (0x0) ioctl(1,TIOCGETA,0xbfbfdf18) = 0 (0x0) ioctl(1,TIOCGETA,0xbfbfded8) = 0 (0x0) ioctl(1,TIOCGWINSZ,0xbfbfdf30) = 0 (0x0) ioctl(0,TIOCGWINSZ,0xbfbfe428) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) ioctl(0,TIOCGETA,0x288067a8) = 0 (0x0) sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGTERM|SIGTSTP|SIGCONT|SIGWINCH,0x0) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) issetugid(0xbfbfe870,0x280c02f4,0x2807e470,0xbfbfe910,0x2806aadf,0xbfbfe898) = 0 (0x0) open("/root/.editrc",O_RDONLY,0666) ERR#2 'No such file or directory' [ hit Ctrl-C here ] open("/dev/tty",O_RDWR|O_CLOEXEC,00) ERR#4 'Interrupted system call' SIGNAL 2 (SIGINT) sigreturn(0xbfbfe8c0,0x2,0x10006,0xbfbfe8c0,0x0,0x8060590) ERR#4 'Interrupted system call' ioctl(0,TIOCGETA,0xbfbfec70) = 0 (0x0) fcntl(0,0x11,0xa) = 10 (0xa) ioctl(10,TIOCGPGRP,0xbfbfeca4) = 0 (0x0) getpgrp() = 1806 (0x70e) sigaction(SIGTSTP,0x0,{ SIG_DFL SA_RESTART ss_t }) = 0 (0x0) sigaction(SIGTSTP,{ SIG_IGN 0x0 ss_t },0x0) = 0 (0x0) sigaction(SIGTTOU,0x0,{ SIG_DFL SA_RESTART ss_t }) = 0 (0x0) sigaction(SIGTTOU,{ SIG_IGN 0x0 ss_t },0x0) = 0 (0x0) sigaction(SIGTTIN,0x0,{ SIG_DFL SA_RESTART ss_t }) = 0 (0x0) sigaction(SIGTTIN,{ SIG_DFL 0x0 ss_t },0x0) = 0 (0x0) setpgid(0x0,0x70f,0xa,0x0,0xbfbfed70,0xbfbfece0) = 0 (0x0) ioctl(10,TIOCSPGRP,0xbfbfeca4) = 0 (0x0) stat(".",{ mode=drwxr-xr-x ,inode=11797632,size=512,blksize=32768 }) = 0 (0x0) stat("/root",{ mode=drwxr-xr-x ,inode=11797632,size=512,blksize=32768 }) = 0 (0x0) sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) setpgid(0x0,0x70e,0xbfbfec48,0x0,0xbfbfec70,0xbfbfecd8) = 0 (0x0) ioctl(10,TIOCSPGRP,0xbfbfec24) = 0 (0x0) close(10) = 0 (0x0) process exit, rval = 0 I dont know if this does matter, but just for the record: the serial line device /dev/cuaU0 from which the login was done and where the problem occures, was created by the uplcom(4) USB support for Prolific PL-2303/2303X/2303HX serial adapters driver; the real problem is, that after login por the serial line /dev/cuaU0 no process is able to open /dev/tty, it just hangs on open(2) syscall; I verified this with a small C-code:
fd = open("/dev/tty", O_RDWR|O_CLOEXEC, 0);
gives in truss:
...
open("/dev/tty",O_RDWR|O_CLOEXEC,00) ERR#4 'Interrupted system call'
SIGNAL 2 (SIGINT)
(the SIGINT is from Ctrl-C
(In reply to Matthias Apitz from comment #4) What is the wait channel for the hung open ? Did you specified the line to use hw flow control ? Does your cable has necessary wires, does your usb/com adapter supports hw flow control ? (In reply to Konstantin Belousov from comment #5) I have not specified hw flow control and I do not know if the USB-serial supports this. As described in the handbook, I added to /etc/ttys a line: cuaU0 "/usr/libexec/getty std.9600" vt102 on secure and after 'kill -HUP 1' on the terminal, login as root is possible and, for example, an 'ls -lR /' works nicely passing the output fine to the VT102; i.e. I do not think, that we have some flow control issue; the only things I have figured out so far are: 1) one can not use /bin/sh as login shell, it will hang on login; 2) you can not open /dev/tty after login; it will hang 3) if you use MUA mutt, and below this the vim to write the mail, mutt will hang too after the end of vim; and a Ctrl-C makes it continue (perhaps for the same reason of hang on /dev/tty open call) what Do you want me to check or change exactly? Thanks it works now fine with this line in /etc/ttys: ttyU0 "/usr/libexec/getty 3wire.9600" vt102 on secure and we can close the issue; maybe the cap. 26.3.1 should be changed to use 'ttyUX' and not 'ttyuX' (i.e. capital 'U') and point out the difference between '/dev/cuaUX' and '/dev/ttyUX'; please close the issue; thanks to Ed Schouten <ed@nuxi.nl> for the helping hint; I think you can close the ticket since you created it. Also ttyUX is correct in your situation since it's USB -> serial adapter and ucom is in play. |
