[Bug 407428] Re: sshd zombie processes and strange behavior after karmic upgrade

[Fabien Tassin]

I'm experiencing the same bug, karmic x64, tons of ssh zombies.
Happens with interactive and non-interactive shells, and with ssh tunnels.

if i restarts the main sshd, it works for a little while, then starts
leaving zombies behind.

My shell is tcsh (doesn't seem to matter though).

If i strace the main sshd while doing a "ssh server echo '$$'", i see:

28640 write(1, "28640\n", 6)            = 6                <=== my echo
28640 rt_sigprocmask(SIG_SETMASK, NULL, ~[INT KILL ALRM TERM CHLD STOP RTMIN RT_1], 8) = 0
28640 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM TERM CHLD STOP RTMIN RT_1], NULL, 8) = 0
28640 close(0)                          = 0
28640 close(1)                          = 0
28640 close(2)                          = 0
28640 rt_sigprocmask(SIG_SETMASK, NULL, ~[KILL ALRM TERM CHLD STOP RTMIN RT_1], 8) = 0
28640 rt_sigprocmask(SIG_SETMASK, ~[INT KILL ALRM TERM CHLD STOP RTMIN RT_1], NULL, 8) = 0
28640 exit_group(0)                     = ?                        <=== the shell exits properly
28639 <... select resumed> )            = 1 (in [11])
28639 rt_sigprocmask(SIG_BLOCK, [CHLD], ~[KILL ALRM STOP RTMIN RT_1], 8) = 0
28639 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM STOP RTMIN RT_1], NULL, 8) = 0
28639 read(11, "28640\n", 16384)        = 6
28639 select(14, [3 7 11 13], [3], NULL, NULL) = 3 (in [11 13], out [3])
28639 rt_sigprocmask(SIG_BLOCK, [CHLD], ~[KILL ALRM STOP RTMIN RT_1], 8) = 0
28639 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM STOP RTMIN RT_1], NULL, 8) = 0
28639 read(11, "", 16384)               = 0
28639 close(11)                         = 0
28639 read(13, "", 16384)               = 0
28639 close(13)                         = 0
28639 write(3, "\315\300.\216\6\313\\\303\360\304\324*\355\332\222\373\266\275\255\275\t\261\",\325\205\3432\25\355\26\214"..., 48) = 48
28639 select(14, [3 7], [3], NULL, NULL) = 1 (out [3])
28639 rt_sigprocmask(SIG_BLOCK, [CHLD], ~[KILL ALRM STOP RTMIN RT_1], 8) = 0
28639 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM STOP RTMIN RT_1], NULL, 8) = 0
28639 write(3, "\202T\314[\351\244\33\22\245\361\302NI=Yv\35\375\311h\25\275\272\255fbzH\365\244\247n", 32) = 32
28639 select(14, [3 7], [], NULL, NULL      <== the forked sshd expects something from fd 3 or 7 but it never happens

** Changed in: openssh (Ubuntu)
       Status: Incomplete => Confirmed

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sshd zombie processes and strange behavior after karmic upgrade
https://bugs.launchpad.net/bugs/407428
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