BB 1.7.2 and many old versions down to 1.4.x, I don't know exactly.
Platform: mipsel
We have had this problem for months, maybe 1-2 years, with different BB
versions, but now I think it is time to report it:
On my embedded system there is BB running telnetd. The shell is ash. A
client logs in and works until he types "exit". After that the session
is terminated, but the telnet client hanngs waiting for - I don't know
what. I can reproduce it with several telnet clients. It does not happen
with Dropbear sshd, so I strongly assume it is a BB problem.
Interestingly, the session exits cleanly if I call "setconsole -r"
during the telnet session.
I have attached two sets of log files generated like this:
> strace -p 1186 -p 742 -f -ff -s 100 -o /ash-telnet-ok.log
PID 742 is telnetd, 1131/1186 are ash, respectively. The ash protocols
are just there for completeness, they are identical. The telnetd logs
differ, though.
Maybe somebody can find out what is wrong here. It might be a similar
case to "ash endless loop after ssh client is killed" (April 20-29,
2007), I don't know.
Regards
--
Alexander Kriegisch
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "e", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "e", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "e", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "e", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "x", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "x", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "x", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "x", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "i", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "i", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "i", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "i", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "t", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "t", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "t", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "t", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "\r\n", 2022) = 2
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "\r", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "\r\n", 2022) = 2
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "\r\n", 2) = 2
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 --- SIGCHLD (Child exited) @ 0 (0) ---
742 read(5, 0x4a7822, 2022) = -1 EIO (Input/output error)
742 kill(1186, SIGKILL) = 0
742 wait4(1186, NULL, 0, NULL) = 1186
742 close(5) = 0
742 close(4) = 0
742 close(4) = -1 EBADF (Bad file descriptor)
742 _newselect(4, [3], [], NULL, NULL <unfinished ...>
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "e", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "e", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "e", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "e", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "x", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "x", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "x", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "x", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "i", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "i", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "i", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "i", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "t", 2022) = 1
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "t", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "t", 2022) = 1
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "t", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [4])
742 read(4, "\r\n", 2022) = 2
742 _newselect(6, [3 4 5], [5], NULL, NULL) = 1 (out [5])
742 write(5, "\r", 1) = 1
742 _newselect(6, [3 4 5], [], NULL, NULL) = 1 (in [5])
742 read(5, "\r\n", 2022) = 2
742 _newselect(6, [3 4 5], [4], NULL, NULL) = 1 (out [4])
742 write(4, "\r\n", 2) = 2
742 _newselect(6, [3 4 5], [], NULL, NULL) = ? ERESTARTNOHAND (To be
restarted)
742 --- SIGCHLD (Child exited) @ 0 (0) ---
742 _newselect(6, [3 4 5], [], NULL, NULL <unfinished ...>
1186 read(0, "e", 1) = 1
1186 write(1, "e", 1) = 1
1186 read(0, "x", 1) = 1
1186 write(1, "x", 1) = 1
1186 read(0, "i", 1) = 1
1186 write(1, "i", 1) = 1
1186 read(0, "t", 1) = 1
1186 write(1, "t", 1) = 1
1186 read(0, "\n", 1) = 1
1186 write(1, "\n", 1) = 1
1186 ioctl(0, TIOCSCTTY, {B38400 opost isig icanon echo ...}) = 0
1186 ioctl(0, TIOCNXCL, {B38400 opost isig icanon echo ...}) = 0
1186 rt_sigaction(SIGWINCH, {0x10000000, [], 0}, {0x10000000, [],
SA_SIGINFO|SA_NOCLDWAIT|0x46ab70}, 16) = 0
1186 ioctl(10, 0x80047476, 0x7fa4596c) = 0
1186 setpgid(0, 1186) = -1 EPERM (Operation not permitted)
1186 close(10) = 0
1186 exit(0) = ?
1131 read(0, "e", 1) = 1
1131 write(1, "e", 1) = 1
1131 read(0, "x", 1) = 1
1131 write(1, "x", 1) = 1
1131 read(0, "i", 1) = 1
1131 write(1, "i", 1) = 1
1131 read(0, "t", 1) = 1
1131 write(1, "t", 1) = 1
1131 read(0, "\n", 1) = 1
1131 write(1, "\n", 1) = 1
1131 ioctl(0, TIOCSCTTY, {B38400 opost isig icanon echo ...}) = 0
1131 ioctl(0, TIOCNXCL, {B38400 opost isig icanon echo ...}) = 0
1131 rt_sigaction(SIGWINCH, {0x10000000, [], 0}, {0x10000000, [],
SA_SIGINFO|SA_NOCLDWAIT|0x46ab70}, 16) = 0
1131 ioctl(10, 0x80047476, 0x7fc9296c) = 0
1131 setpgid(0, 1131) = -1 EPERM (Operation not permitted)
1131 close(10) = 0
1131 exit(0) = ?
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