Hello.
At my system:
CYGWIN_NT-5.1 1.3.13(0.62/3/2) 2002-10-13 23:15
sshd fails in fork:
------------------------- sshd --------------------------------
/usr/sbin>./sshd.exe -d
debug1: sshd version OpenSSH_3.4p1
debug1: private host key: #0 type 0 RSA1
debug1: read PEM private key done: type RSA
debug1: private host key: #1 type 1 RSA
debug1: read PEM private key done: type DSA
debug1: private host key: #2 type 2 DSA
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
Generating 768 bit RSA key.
RSA key generation complete.
debug1: Server will not fork when running in debugging mode.
Connection from 127.0.0.1 port 2598
debug1: Client protocol version 1.5; client software version OpenSSH_3.4p1
debug1: match: OpenSSH_3.4p1 pat OpenSSH*
debug1: Local version string SSH-1.99-OpenSSH_3.4p1
debug1: Sent 768 bit server key and 1024 bit host key.
debug1: Encryption type: 3des
debug1: cipher_init: set keylen (16 -> 32)
debug1: cipher_init: set keylen (16 -> 32)
debug1: Received session key; encryption turned on.
debug1: Installing crc compensation attack detector.
debug1: Attempting authentication for kim.
debug1: temporarily_use_uid: 500/544 (e=500)
debug1: trying public RSA key file /home/kim/.ssh/authorized_keys
debug1: restore_uid
Failed rsa for kim from 127.0.0.1 port 2598
debug1: rcvd SSH_CMSG_AUTH_TIS
Failed challenge-response for kim from 127.0.0.1 port 2598
Accepted password for kim from 127.0.0.1 port 2598
debug1: session_new: init
debug1: session_new: session 0
debug1: Allocating pty.
debug1: session_pty_req: session 0 alloc /dev/tty2
9 [main] sshd 1872 sync_with_child: child 228(0x610) died before
initialization with status code 0x80
8434 [main] sshd 1872 sync_with_child: *** child state waiting for
longjmp
Disconnecting: fork failed: Resource temporarily unavailable
debug1: Calling cleanup 0x416ca0(0x44d4e0)
debug1: session_pty_cleanup: session 0 release /dev/tty2
debug1: Calling cleanup 0x41e360(0x0)
------------------------------- ssh ----------------------------------
~>ssh -vv localhost
OpenSSH_3.4p1, SSH protocols 1.5/2.0, OpenSSL 0x0090607f
debug1: Reading configuration data /home/kim/.ssh/config
debug1: Reading configuration data /etc/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be
trusted.
debug1: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/kim/.ssh/identity type 0
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.4p1
debug1: match: OpenSSH_3.4p1 pat OpenSSH*
debug1: Local version string SSH-1.5-OpenSSH_3.4p1
debug1: Waiting for server public key.
debug1: Received server public key (768 bits) and host key (1024 bits).
debug1: Host 'localhost' is known and matches the RSA1 host key.
debug1: Found key in /home/kim/.ssh/known_hosts:7
debug1: Encryption type: 3des
debug1: Sent encrypted session key.
debug1: cipher_init: set keylen (16 -> 32)
debug1: cipher_init: set keylen (16 -> 32)
debug1: Installing crc compensation attack detector.
debug1: Received encrypted confirmation.
debug1: Trying RSA authentication with key '/home/kim/.ssh/identity'
debug1: Server refused our key.
debug1: Doing challenge response authentication.
debug1: No challenge.
debug1: Doing password authentication.
kim@localhost's password:
debug1: Requesting pty.
debug1: fd 3 setting TCP_NODELAY
debug1: Requesting shell.
debug1: Entering interactive session.
Received disconnect from 127.0.0.1: fork failed: Resource temporarily
unavailable
debug1: Calling cleanup 0x40c2d8(0x0)
debug1: Calling cleanup 0x419440(0x0)
--------------------------- strace output ----------------------
106 2418684 [main] sshd 240 fork: entering
226 2418910 [main] sshd 240 subproc_init: started wait_subproc thread
0x668
178 2419088 [main] sshd 240 stack_base: bottom 0x230000, top 0x30000,
stack 0x22EF48, size 4280, reserve 2097152
63 2419151 [main] sshd 240 fork_parent: CreateProcess
(C:\cygwin\usr\sbin\sshd.exe, C:\cygwin\usr\sbin\sshd.exe, 0, 0, 1,
24, 0, 0, 0x22F3D8, 0x22F428)
848 2419999 [proc] sshd 240 wait_subproc: starting
4261 2424260 [main] sshd 240 dtable::fixup_before_fork: fd 0 (/dev/piper)
1687 2425947 [main] sshd 240 dtable::fixup_before_fork: fd 1 (/dev/pipew)
168 2426115 [main] sshd 240 dtable::fixup_before_fork: fd 2 (/dev/pipew)
55 2426170 [main] sshd 240 dtable::fixup_before_fork: fd 3
(/dev/streamsocket)
305 2426475 [main] sshd 240 fhandler_socket::fixup_before_fork_exec:
WSADuplicateSocket went fine, sock 0x678, win_proc_id
836, prot_info_ptr 0x61680764
121 2426596 [main] sshd 240 dtable::fixup_before_fork: fd 4 (/dev/tcp)
86 2426682 [main] sshd 240 fhandler_socket::fixup_before_fork_exec:
WSADuplicateSocket went fine, sock 0x694, win_proc_id
836, prot_info_ptr 0x61680A44
60 2426742 [main] sshd 240 dtable::fixup_before_fork: fd 5 (/dev/piper)
53 2426795 [main] sshd 240 dtable::fixup_before_fork: fd 6 (/dev/pipew)
53 2426848 [main] sshd 240 dtable::fixup_before_fork: fd 7
(/dev/streamsocket)
81 2426929 [main] sshd 240 fhandler_socket::fixup_before_fork_exec:
WSADuplicateSocket went fine, sock 0x684, win_proc_id
836, prot_info_ptr 0x61680F1C
1267 2428196 [main] sshd 240 proc_subproc: args: 1, 2289608
166 2428362 [main] sshd 240 proc_subproc: added pid 836 to wait list, slot
0, winpid 0x344, handle 0x644
60 2428422 [main] sshd 240 proc_subproc: returning 1
59 2428481 [main] sshd 240 sync_with_child: waiting for child. reason:
waiting for longjmp, hang_child 1
248 2428729 [proc] sshd 240 wait_subproc: looping
6228 2434957 [proc] sshd 240 proc_subproc: args: 2, 0
184 2435141 [proc] sshd 240 proc_subproc: pid 836[0] terminated, handle
0x644, nchildren 1, nzombies 0
57 2435198 [proc] sshd 240 proc_subproc: zombifying [0], pid 836, handle
0x644, nchildren 1
56 2435254 [proc] sshd 240 proc_subproc: returning 1
55 2435309 [proc] sshd 240 sig_send: pid 240, signal 20, its_me 1
58 2435367 [proc] sshd 240 sig_send: Not waiting for sigcomplete. its_me
1 signal 20
5526 2440893 [proc] sshd 240 sig_send: returning 0 from sending signal 20
127 2441020 [proc] sshd 240 wait_subproc: looping
273 2441293 [sig] sshd 240 wait_sig: awake
77 2441370 [sig] sshd 240 wait_sig: processing signal 20
54 2441424 [sig] sshd 240 wait_sig: Got signal 20
53 2441477 [sig] sshd 240 sig_handle: signal 20
79 2441556 [sig] sshd 240 sig_handle: default signal 20 ignored
56 2441612 [sig] sshd 240 sig_handle: returning 0
55 2441667 [sig] sshd 240 proc_subproc: args: 3, 0
55 2441722 [sig] sshd 240 proc_subproc: looking for processes to reap
53 2441775 [sig] sshd 240 proc_subproc: finished processing
terminated/stopped child
53 2441828 [sig] sshd 240 proc_subproc: returning 1
52 2441880 [sig] sshd 240 wait_sig: looping
-634 2441246 [main] sshd 240 sync_with_child: child 836(0x644) died before
initialization with status code 0x80
3114 2444360 [main] sshd 240 sync_with_child: *** child state waiting for
longjmp
2009 2446369 [main] sshd 240 sync_with_child: Child died before
subproc_ready signalled
81 2446450 [main] sshd 240 fork: -1 = fork()
----------------------------------------------------------------------------
---
But simple fork application:
int main()
{
fork();
printf( "Hello\n");
return 0;
}
works fine.
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