Patch Name: PHKL_8556 Patch Description: s700 10.01 process management and signals cumulative patch Creation Date: 96/09/14 Post Date: 96/09/16 Hardware Platforms - OS Releases: s700: 10.01 Products: N/A Filesets: OS-Core.CORE-KRN Automatic Reboot?: Yes Status: General Release Critical: No (superseded patches were critical) PHKL_6450: PANIC Path Name: /hp-ux_patches/s700/10.X/PHKL_8556 Symptoms: PHKL_8556: Some zombies are left in the proc table even though the parent process did a SIG_IGN SIGCLD. This occurs on MP system only not on UP. The patch PHKL_8059/60 was fixing this, but left some unecessary message in dmesg. This patch PHKL_8556/57 remove those printf of the form: pm_signal.c: zombie left PHKL_8059: Some zombies are left in the proc table even though the parent process did a SIG_IGN SIGCLD. This occurs on MP system only not on UP. PHKL_6450: panic: psig action Defect Description: PHKL_8556: There is a window open on MP system were the child exit() code path do a pm_signal(parent,SIGCLD) and a swtch(). Between this two call the parent may be swtch()'ed in on another processor and get the SIGCLD while the child is still SRUNPROC. In that case the original code just do nothing lefting a sticking zombie until the parent dies. This patch will avoid this case by waiting the child to reset the SRUNPROC (i.e completing its swtch() ). PHKL_8059: This patch re-submitted to remove unwanted printf in dmesg that may be anoying. There is a window open on MP system were the child exit() code path do a pm_signal(parent,SIGCLD) and a swtch(). Between this two calls the parent may be swtch()'ed in on another processor and get the SIGCLD while the child is still SRUNPROC. If the action is SIG_IGN the zombie should be cleaned, the original code just do nothing since you can't clean an SRUNPROC process, then lefting a sticking zombie until the parent dies. This patch will avoid this case by waiting the child to reset the SRUNPROC (i.e completing its swtch() ). PHKL_6450: When running signal-intensive software on a multiprocessor machine, the operating system may crash with "panic: psig action". This can only occur when a user process is sent a signal while in the midst of a system call to ignore that very signal -- that is, using sigaction or sigvec. An assertion in the kernel states that it is erroneous for a signal to be delivered to a process that has marked said signal as "ignored." That assertion was in error, and has been removed. If a signal is delivered to a process while said signal is being ignored, the signal will be dropped. SR: 1653177857 5000713743 Patch Files: /usr/conf/lib/libhp-ux.a(pm_signal.o) what(1) Output: /usr/conf/lib/libhp-ux.a(pm_signal.o): pm_signal.c $Date: 96/09/14 01:18:16 $ $Revision: 1.2.71.22 $ PATCH_10.01 (PHKL_8556) cksum(1) Output: 3491357637 8436 /usr/conf/lib/libhp-ux.a(pm_signal.o) Patch Conflicts: None Patch Dependencies: None Hardware Dependencies: None Other Dependencies: None Supersedes: PHKL_6450 PHKL_8059 Equivalent Patches: PHKL_8557: s700: 10.01 Patch Package Size: 70 Kbytes Installation Instructions: Please review all instructions and the Hewlett-Packard SupportLine User Guide or your Hewlett-Packard support terms and conditions for precautions, scope of license, restrictions, and, limitation of liability and warranties, before installing this patch. ------------------------------------------------------------ 1. Back up your system before installing a patch. 2. Login as root. 3. Copy the patch to the /tmp directory. 4. Move to the /tmp directory and unshar the patch: cd /tmp sh PHKL_8556 5a. For a standalone system, run swinstall to install the patch: swinstall -x autoreboot=true -x match_target=true \ -s /tmp/PHKL_8556.depot 5b. For a homogeneous NFS Diskless cluster run swcluster on the server to install the patch on the server and the clients: swcluster -i -b This will invoke swcluster in the interactive mode and force all clients to be shut down. WARNING: All cluster clients must be shut down prior to the patch installation. Installing the patch while the clients are booted is unsupported and can lead to serious problems. The swcluster command will invoke an swinstall session in which you must specify: alternate root path - default is /export/shared_root/OS_700 source depot path - /tmp/PHKL_8556.depot To complete the installation, select the patch by choosing "Actions -> Match What Target Has" and then "Actions -> Install" from the Menubar. 5c. For a heterogeneous NFS Diskless cluster: - run swinstall on the server as in step 5a to install the patch on the cluster server. - run swcluster on the server as in step 5b to install the patch on the cluster clients. By default swinstall will archive the original software in /var/adm/sw/patch/PHKL_8556. If you do not wish to retain a copy of the original software, you can create an empty file named /var/adm/sw/patch/PATCH_NOSAVE. Warning: If this file exists when a patch is installed, the patch cannot be deinstalled. Please be careful when using this feature. It is recommended that you move the PHKL_8556.text file to /var/adm/sw/patch for future reference. To put this patch on a magnetic tape and install from the tape drive, use the command: dd if=/tmp/PHKL_8556.depot of=/dev/rmt/0m bs=2k Special Installation Instructions: None