Date: Tue, 18 Jul 2006 15:14:16 -0700 From: Ulf Zimmermann <ulf@Alameda.net> To: hackers@freebsd.org Subject: sshd throwing signal 6 (sigabrt) Message-ID: <20060718221415.GI45191@evil.alameda.net>
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I have a FreeBSD server (was 5.4-prerelease, now 6-stable as of noon PDT). On this server I got a problem with sshd throwing signal 6: Jul 18 15:04:03 log01 sshd[66161]: debug2: User child is on pid 66163 Jul 18 15:04:03 log01 sshd[66163]: debug3: PAM: opening session Jul 18 15:04:03 log01 sshd[66163]: debug1: PAM: reinitializing credentials Jul 18 15:04:03 log01 sshd[66163]: debug2: set_newkeys: mode 0 Jul 18 15:04:03 log01 sshd[66163]: debug2: set_newkeys: mode 1 Jul 18 15:04:03 log01 sshd[66163]: debug1: Entering interactive session for SSH2. Jul 18 15:04:03 log01 sshd[66163]: debug2: fd 5 setting O_NONBLOCK Jul 18 15:04:03 log01 sshd[66163]: debug2: fd 6 setting O_NONBLOCK Jul 18 15:04:03 log01 sshd[66163]: debug1: server_init_dispatch_20 Jul 18 15:04:03 log01 sshd[66163]: debug1: server_input_channel_open: ctype session rchan 0 win 131072 max 32768 Jul 18 15:04:03 log01 sshd[66163]: debug1: input_session_request Jul 18 15:04:03 log01 sshd[66163]: debug1: channel 0: new [server-session] Jul 18 15:04:03 log01 sshd[66163]: debug1: session_new: init Jul 18 15:04:03 log01 sshd[66163]: debug1: session_new: session 0 Jul 18 15:04:03 log01 sshd[66163]: debug1: session_open: channel 0 Jul 18 15:04:03 log01 sshd[66163]: debug1: session_open: session 0: link with channel 0 Jul 18 15:04:03 log01 sshd[66163]: debug1: server_input_channel_open: confirm session Jul 18 15:04:03 log01 sshd[66163]: debug1: server_input_channel_req: channel 0 request exec reply 0 Jul 18 15:04:03 log01 sshd[66163]: debug1: session_by_channel: session 0 channel 0 Jul 18 15:04:03 log01 sshd[66163]: debug1: session_input_channel_req: session 0 req exec Jul 18 15:04:03 log01 sshd[66163]: debug2: fd 8 setting O_NONBLOCK Jul 18 15:04:03 log01 sshd[66163]: debug3: fd 8 is O_NONBLOCK Jul 18 15:04:03 log01 sshd[66163]: debug2: fd 10 setting O_NONBLOCK Jul 18 15:04:03 log01 sshd[66163]: debug2: channel 0: rcvd eof Jul 18 15:04:03 log01 sshd[66163]: debug2: channel 0: output open -> drain Jul 18 15:04:03 log01 sshd[66163]: debug2: channel 0: obuf empty Jul 18 15:04:03 log01 sshd[66163]: debug2: channel 0: close_write Jul 18 15:04:03 log01 sshd[66163]: debug2: channel 0: output drain -> closed Jul 18 15:04:03 log01 pid 66163 (sshd), uid 10042: exited on signal 6 About 80 servers have two cronjobs each starting at the full hour. Each cronjob has a random sleep of 0 to 900 seconds before it executes ssh/scp/rsync to copy one or multiple files to that FreeBSD server. One cronjob copies one file ranging in size 30KB to 300KB. The other cronjob copies 10-30 RRD files, ranging in size from 200KB to 1MB. Of these about 160 ssh connections in a time range of 15 minutes, I get 1 to 10 errors at the end of the connection. All files get copied as far I can tell but when the connection closes I see the above signal 6. On the source side of the ssh connection I get error messages like "Connection to xxxx closed by remote host" "ssh_exchange_identification: Connection closed by remote host lost connection" Anyone have an idea what the problem could be that sshd see sigabrt? -- Regards, Ulf. --------------------------------------------------------------------- Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-865-0204 You can find my resume at: http://seven.Alameda.net/~ulf/resume.html
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