Server continues to spawn ksh processes

Solution Verified - Updated -

Issue

  • System keeps spawning ksh process like below. It spawns about 300 per sec.
user1  1464992 1464991  0 12:14 ?        00:00:00 -ksh
user1  1464993 1464992  0 12:14 ?        00:00:00 -ksh
user1  1464994 1464993  0 12:14 ?        00:00:00 -ksh
user1  1464995 1464994  0 12:14 ?        00:00:00 -ksh
user1  1464996 1464995  0 12:14 ?        00:00:00 -ksh
user1  1464997 1464996  0 12:14 ?        00:00:00 -ksh
user1  1464998 1464997  0 12:14 ?        00:00:00 -ksh
  • Processes are not responding to SIGSTP properly
[root@devserv test]# strace -p 2243414
Process 2243414 attached - interrupt to quit
wait4(-1, 0x7fff5a87fee4, WSTOPPED|WCONTINUED, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGTSTP (Stopped) @ 0 (0) ---
rt_sigaction(SIGTSTP, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, 8) = 0
rt_sigreturn(0x14)                      = 61
wait4(-1, 0x7fff5a87fee4, WSTOPPED|WCONTINUED, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGTSTP (Stopped) @ 0 (0) ---
rt_sigaction(SIGTSTP, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, 8) = 0
rt_sigreturn(0x14)                      = 61
wait4(-1, 0x7fff5a87fee4, WSTOPPED|WCONTINUED, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGTSTP (Stopped) @ 0 (0) ---
rt_sigaction(SIGTSTP, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, 8) = 0
rt_sigreturn(0x14)                      = 61
wait4(-1, 0x7fff5a87fee4, WSTOPPED|WCONTINUED, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGTSTP (Stopped) @ 0 (0) ---
rt_sigaction(SIGTSTP, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, {0x416c10, [], SA_RESTORER|SA_RESTART, 0x381e4302d0}, 8) = 0
rt_sigreturn(0x14)                      = 61
wait4(-1, 0x7fff5a87fee4, WSTOPPED|WCONTINUED, NULL) = ? ERESTARTSYS (To be restarted)

Environment

  • Red Hat Enterprise Linux 5.6
  • ksh-20100621-12 and earlier

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