similar to: SIGCHLD race condition? (fwd)

We use ssh (RedHat 2.5.2p2-5) heavily in non-interactive mode, for managing servers from central controllers, and transferring applications/ data around networks. Very occasionally we've seen the situation where the ssh client and server are both stuck in select, both selecting on only the tcp socket of the connection, and with no timeout. No children of sshd remain (even as zombies), and it

Yes, this is a patch against an older version of OpenSSH with other stuff anyways, BUT, it's so TRIVIAL(*), that you can see how it would apply to newer versions (which I've not tried). Here's the gist: server_loop2() has a race condition with respect to reception of SIGCHLD and checking/setting child_terminated. This patch does two things: wait_until_can_do_something() adds a 1

comments? alternatives: sigsetjmp(ugly) and pselect(not portable, available) drawback: additional filedescriptors. Index: serverloop.c =================================================================== RCS file: /home/markus/cvs/ssh/serverloop.c,v retrieving revision 1.82 diff -u -r1.82 serverloop.c --- serverloop.c 10 Oct 2001 22:18:47 -0000 1.82 +++ serverloop.c 11 Oct 2001 18:06:33 -0000 @@

using openssh-3.8.1p1 from sunfreeware.com on a SunOS XXX 5.8 Generic_117000-03 sun4u sparc SUNW,Sun-Fire-V240. sshd seems to ignore or miss SIGCLD. this is a rare behaviour we observe about once per week in a ssh intensive environment. the process hangs here: truss: 24453: poll(0xFFBEEF28, 2, -1) (sleeping...) gcore, mdb: libc.so.1`_poll+4(b, 0, 0, ffbeef38, 6fc40,

Greetings, I have a problem with OpenSSH -current and SCO 3.2v4.2, when I execute a remote command or exit from a session, the connection hangs, ( line 326 of serverloop.c). This problem only exists when using ssh2. server side debug (-d -d -d ): debug1: Received SIGCHLD. debug2: channel 0: read failed debug2: channel 0: close_read debug2: channel 0: input open -> drain debug2: channel 0:

> -----Original Message----- > From: Ben Lindstrom > Sent: 15 September 2003 08:53 > To: Vikash Badal - PCS > Cc: 'openssh-unix-dev at mindrot.org' > Subject: Re: SCO 3.2v4.2 and OpenSSH -current --> connection hangs and > does no t close > > go into bsd-misc.c and comment out the define and try it > again. We should > be using mysignal by default

Here is my third attempt at the idletimeout patch. I tried to address the points which Marcus Friedl brought up. It is actually bigger than the previous patches, but not as intrusive. It is big because it moves some stuff from serverloop.c to packet.c. - I moved all the logic to packet.c. This means that I also had to move the actual select() call, which used to be in serverloop.c to packet.c.

http://bugzilla.mindrot.org/show_bug.cgi?id=79 Summary: A race with select() in SIGCHLD handling causes hangs occasionally Product: Portable OpenSSH Version: 3.0.2p1 Platform: All URL: http://marc.theaimsgroup.com/?l=openssh-unix- dev&m=100454673601558&w=2 OS/Version: All

HP-UX 11 is looping on SIGCHLD/sigchld_handler2() when exiting a protocol 2 session apparently because we don't call wait before reinstalling the handler. Any thoughts on this issue or how to address it? serverloop.c from latest snapshots: void sigchld_handler2(int sig) { int save_errno = errno; debug("Received SIGCHLD."); child_terminated = 1; signal(SIGCHLD,

Hello, In response to the timing analysis attacks presented by Dawn Song et. al. in her paper http://paris.cs.berkeley.edu/~dawnsong/ssh-timing.html we at Silicon Defense developed a patch for openssh to avoid such measures. Timing Analysis Evasion changes were developed by C. Jason Coit and Roel Jonkman of Silicon Defense. These changes cause SSH to send packets unless request not to,

Hi, I am trying to run sftp on SX-6 and it is giving me problem when I try to exit from sftp. On pressing ^D or entering "bye" on sftp prompt, sftp hangs. And I have to press ^C to quit. The versions are: - 1. openssh-3.1p1 on both client and server. 2. Both client (sftp) and server (sshd) are running on SX-6 It appears that the client and server are hanging on "select".

I have a strange problem with sshd (from openssh-2.9p2) on Solaris 7. My shell is bash. When I open an ssh session , and type a Control-C to bash's prompt, the shell hangs. (But, if I for instance run "sleep 10" (during which time the pty is in cooked mode) and press Control-C, the sleep command is interrupted quite normally, and the bash prompt returns.) Adding some debugging

I recently started building a simulator using honeyd as an IP emulator and experienced an issue with hangs on exit from ssh and sftp sessions. A quick look at the OpenSSH source code revealed the following: In serverloop.c there is a signal handler defined for SIGCHLD as follows: static void sigchld_handler(int sig) { int save_errno = errno; debug("Received SIGCHLD.");

Team, Im im new on this forum and with RSYNC, i have a Server that im using for hosting my own subdomains, using Ensim and MYSQL, but i have another server that o would like to be my backup server.. (FYI: I have 2 License of the Ensim) My questions are: 1.- Can i use Rsync to backup my primary server to the secondary server? MYSQL, ENSIM? 2.- If so how would i do it? Do i just do a whole

On Tue, Dec 29, 2009 at 12:36 PM, Lanny Marcus <lmmailinglists at gmail.com> wrote: > I looked on the openssl man page but am too dense with commands to > understand what I need to do..... ? Ran into problems generating a key > and CSR for SSL, ?because the web site is on a server with an old > Ensim Control Panel. ?Please someone knowledgeable, ?give me the > openssl commands

Hi, I'm trying to calculate some functions loop, unfortunately my data are decimal numbers that not allow me to get an accurate estimate. I do not want to use neither "round "nor "signif" but I would prefer to have all the information available, (the function loop is generic so you should adapt to all data, not just those in particular). The approximation error is

Hello. Recently, I started using rsync to backup files in my root partition on an Ensim box over to a remote machine. The remote machine 'pulls' from the Ensim box using the following: rsync -arvzx --exclude=/proc --exclude=/tmp --exclude=/mnt --delete --delete-excluded -e ssh 192.168.0.1:/ /bkup/rootpart/ The problem is, if I 'df' the Ensim box, it reports that the entire

On 2.3.0p1, we have been experiencing the SSH2 stdout truncation problem that was reported by a few users. I built the 20010115 snapshot. It seems to correct the problem but before I was able to test it, I had to change sigchld_handler2 so it would not reset the signal handler before waitpid is called. On Irix, it seems a SIGCHLD is delivered for ever... I haven't tried the last snapshots so

http://bugzilla.mindrot.org/show_bug.cgi?id=651 Summary: SCO 3.2v4.2 and OpenSSH 3.7.1p1 --> connection hangs and does not close (ssh2 only) Product: Portable OpenSSH Version: 3.7p1 Platform: All OS/Version: other Status: NEW Severity: major Priority: P2 Component: sshd

I looked on the openssl man page but am too dense with commands to understand what I need to do..... Ran into problems generating a key and CSR for SSL, because the web site is on a server with an old Ensim Control Panel. Please someone knowledgeable, give me the openssl commands I need to use, after I ssh into the web site, to generate a 2048 bit key and csr. TIA and Happy New Year!