Process Hang

Hi,
I have a problem that I put on the back-burner a few months ago, but it has become more important again.
I have a daemon which maintains a multiplexing stream stack. Every once in a while when the daemon exits and tears down the stack (flushing the queues), I start seeing a number of other processes hanging. I can still interrupt out of them, but their tasks can't be completed.
For example, "sleep 1" would never return.
Forgive me for not being exact. I don't have my copy of the kernel source with me here, and I won't be able to get to it until next week.
I used the kernel debugger to find where in the kernel sleep's thread was hung, and I discovered that it was stuck on a mutex in a kernel function that allowed the process to go to sleep and be swapped out. The kernel should have awoken the mutex but never did. The mutex was contained in the process structure.
I'm wondering if this is a problem that would have been fixed in one of the patches on the Sun Support site, or if it is something stupid that I have done in my drivers. I thought it may have been a stray spl that I missed when converting them to perimiters (I used mutually exclusive inner perimiters), but that doesn't seem to be it.
Any help is appreciated. I'll try to supply more details if necessary.
Jared

If it runs for several hours before failing, it's handling a LOT of data. If freeing things after every iteration is going to goof the speed up too much don't do it. Right now, the GUESS is that if resources are never freed until the end, they become exhausted. Freeing every iteration may be the pendulum swinging from one extreme to the other, and hopefully a middle ground can be found.
If these files are routinely in the terabyte range, instead of freeing each segment, you could free each file. I'd be happy with a data structure that lasted a terabyte! Or if you're doing multiple directories, each directory. With the massive amount of data that you're processing, a subtle memory leak could be doing this.
Roger

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Hi,
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SELECT * FROM V$RECOVERY_FILE_DEST;
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source is oracle.com
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[Solved] Boot process hangs for installed Arch and installation usb

Hi. I've been using Arch Linux for around 6 months now and I'm in love with it. It is now my primary OS. However, I might have done something or performed some update, and I can no longer boot into Arch. The boot process hangs right before it should show the login screen (I'm using Gnome 3.6 with GDM). I see the following messages on the screen:
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I also have Windows 7 and Ubuntu 12.10 installed on my system, and I'm able to boot into both of them.
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sda3 - ArchLinux (boot flag enabled)
sdb1 - Ubuntu 12.10 (boot flag enabled)
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I ran bootinfoscript and below is the output:
Boot Info Script 0.61 [1 April 2012]
============================= Boot Info Summary: ===============================
=> Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
in partition 99 for .
=> Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
in partition 99 for .
sda1: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /Boot/BCD
sda2: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System: Windows 7
Boot files: /Windows/System32/winload.exe
sda3: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Mounting failed: mount: /dev/sda3 already mounted or sda3 busy
sdb1: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 12.10
Boot files: /boot/grub/grub.cfg /etc/fstab
sdb2: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files:
============================ Drive/Partition Info: =============================
Drive: sda _____________________________________________________________________
Disk /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders, total 234441648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sda1 * 2,048 206,847 204,800 7 NTFS / exFAT / HPFS
/dev/sda2 206,848 178,466,084 178,259,237 7 NTFS / exFAT / HPFS
/dev/sda3 * 178,466,085 234,440,703 55,974,619 83 Linux
Drive: sdb _____________________________________________________________________
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sdb1 * 63 20,948,759 20,948,697 83 Linux
/dev/sdb2 20,964,824 976,771,071 955,806,248 7 NTFS / exFAT / HPFS
"blkid" output: ________________________________________________________________
Device UUID TYPE LABEL
/dev/mmcblk0p1 6665-3162 vfat
/dev/sda1 CA6A20CC6A20B75B ntfs System Reserved
/dev/sda2 1EE242D5E242B137 ntfs
/dev/sda3 65db0c59-9f04-46f1-975d-8a4c28132137 ext4
/dev/sdb1 bb9818db-ce7c-43a4-8ad5-8d3702001aed ext4
/dev/sdb2 3C2E3A4E2E3A0206 ntfs
================================ Mount points: =================================
Device Mount_Point Type Options
/dev/mmcblk0p1 /media/dhaval/6665-3162 vfat (rw,nosuid,nodev,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks2)
/dev/sdb1 / ext4 (rw,errors=remount-ro)
=========================== sdb1/boot/grub/grub.cfg: ===========================
# DO NOT EDIT THIS FILE
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 13,37,73; then
clear
fi
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
set gfxpayload="${1}"
if [ "${1}" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
if [ "${recordfail}" != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "${linux_gfx_mode}" != "text" ]; then load_video; fi
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-bb9818db-ce7c-43a4-8ad5-8d3702001aed' {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
linux /boot/vmlinuz-3.5.0-21-generic root=UUID=bb9818db-ce7c-43a4-8ad5-8d3702001aed ro quiet splash acpi_osi=Linux acpi_backlight=vendor $vt_handoff
initrd /boot/initrd.img-3.5.0-21-generic
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-bb9818db-ce7c-43a4-8ad5-8d3702001aed' {
menuentry 'Ubuntu, with Linux 3.5.0-21-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.5.0-21-generic-advanced-bb9818db-ce7c-43a4-8ad5-8d3702001aed' {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
echo 'Loading Linux 3.5.0-21-generic ...'
linux /boot/vmlinuz-3.5.0-21-generic root=UUID=bb9818db-ce7c-43a4-8ad5-8d3702001aed ro quiet splash acpi_osi=Linux acpi_backlight=vendor $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.5.0-21-generic
menuentry 'Ubuntu, with Linux 3.5.0-21-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.5.0-21-generic-recovery-bb9818db-ce7c-43a4-8ad5-8d3702001aed' {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
echo 'Loading Linux 3.5.0-21-generic ...'
linux /boot/vmlinuz-3.5.0-21-generic root=UUID=bb9818db-ce7c-43a4-8ad5-8d3702001aed ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.5.0-21-generic
menuentry 'Ubuntu, with Linux 3.2.0-29-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.2.0-29-generic-advanced-bb9818db-ce7c-43a4-8ad5-8d3702001aed' {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
echo 'Loading Linux 3.2.0-29-generic ...'
linux /boot/vmlinuz-3.2.0-29-generic root=UUID=bb9818db-ce7c-43a4-8ad5-8d3702001aed ro quiet splash acpi_osi=Linux acpi_backlight=vendor $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.2.0-29-generic
menuentry 'Ubuntu, with Linux 3.2.0-29-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.2.0-29-generic-recovery-bb9818db-ce7c-43a4-8ad5-8d3702001aed' {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
echo 'Loading Linux 3.2.0-29-generic ...'
linux /boot/vmlinuz-3.2.0-29-generic root=UUID=bb9818db-ce7c-43a4-8ad5-8d3702001aed ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.2.0-29-generic
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
linux16 /boot/memtest86+.bin
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='hd1,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos1 --hint-efi=hd1,msdos1 --hint-baremetal=ahci1,msdos1 bb9818db-ce7c-43a4-8ad5-8d3702001aed
else
search --no-floppy --fs-uuid --set=root bb9818db-ce7c-43a4-8ad5-8d3702001aed
fi
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows 7 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-CA6A20CC6A20B75B' {
insmod part_msdos
insmod ntfs
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 CA6A20CC6A20B75B
else
search --no-floppy --fs-uuid --set=root CA6A20CC6A20B75B
fi
chainloader +1
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
=============================== sdb1/etc/fstab: ================================
# /etc/fstab: static file system information.
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sdb1 during installation
UUID=bb9818db-ce7c-43a4-8ad5-8d3702001aed / ext4 errors=remount-ro 0 1
=================== sdb1: Location of files loaded by Grub: ====================
GiB - GB File Fragment(s)
4.564525127 = 4.901121536 boot/grub/grub.cfg 1
5.130507946 = 5.508840960 boot/initrd.img-3.2.0-29-generic 2
5.851592541 = 6.283099648 boot/initrd.img-3.5.0-21-generic 2
6.317649364 = 6.783524352 boot/vmlinuz-3.2.0-29-generic 1
4.965751171 = 5.331934720 boot/vmlinuz-3.5.0-21-generic 2
5.851592541 = 6.283099648 initrd.img 2
5.851592541 = 6.283099648 initrd.img.old 2
4.965751171 = 5.331934720 vmlinuz 2
4.965751171 = 5.331934720 vmlinuz.old 2
I tried adding nomodeset and acpi=off to the boot parameters, but the boot process still hangs. Please let me know if I should provide any other information.
Last edited by dhavalparmar (2012-12-30 11:45:25)

Ok.. So my Arch Linux randomly decided to work. I'm sure I didn't do anything between my last "not working" state and my current "working" state. Below are a few things I tried:
I thought of trying an earlier build of ArchLinux, and downloaded archlinux-2012.11.01-dual.iso and made a bootable USB out of it. It still hung.
I was getting error messages during Arch boot that the last access time for the disks was at a future date. I found out that Ubuntu was using localtime instead of UTC and screwing up my hardware clock. I fixed it, and thought maybe the time issues were causing the boot problem. But fixing time didn't solve my problem.
I chrooted into Arch from my Ubuntu install, ran 'sudo pacman -Syyu' and updated my Arch install.
I thought maybe GDM isn't starting up. I re-enabled the service using 'systemctl enable gdm.service'.
I removed OpenNTPd and installed NTPd. Enabled the daemon using 'systemctl enable ntpd'
None of the above solved the problem, and rebooting to Arch still hung the system. So I stopped fiddling with it yesterday. Today, as usual, I just tried logging into Arch.. And it just worked out of the blue. The solution to me is as mysterious as the problem.
I told this to my friend who introduced me to Arch, and this is what he said:
Damn it computers, you were supposed to be deterministic!

High CPU/Process hang on VDI environment

I have a environment that is currently using Adobe Reader XI running on roughly 125 virtual desktops.
In some of those instances, when adobe reader was launched and closed after, the process hangs up in the background and takes on high CPU. The only means to recover is to open task manager and kill the offending .exe
Thoughts?

Can you try to disable Protected Mode in Adobe Reader [Edit | Preferences | Security (Enhanced)].

Process hanging

Hi,
I have a process running on Solaris 9. After the proces starts it hangs infinietly consuming 100 % of 1 CPU . There are 8 CPU's. I attached this process to truss utility. Below is the snapshot: the thread goes into sleep mode and the process hangs.
/3:     lwp_self()                         = 3
/1:     lwp_create(0xFFBFE868, LWP_DETACHED|LWP_SUSPENDED, 0xFFBFE864) = 4
/4:     lwp_create()     (returning as new lwp ...)     = 0
/3:     sysconfig(_CONFIG_NPROC_ONLN)               = 8
/4:     setustack(0xFCF70634)
/1:     lwp_continue(4)                         = 0
/4:     lwp_schedctl(SC_STATE|SC_PREEMPT, 0, 0xFCC7BD24) = 0
/4:     munmap(0x03F42000, 57344)               = 0
/4:     brk(0x03F50000)                         = 0
/4:     brk(0x04050000)                         = 0
/4:     munmap(0x03F52000, 57344)               = 0
/4:     lwp_unpark(3, 1)                    = 0
/3:     lwp_park(0x00000000, 0)                    = 0
/4:     lwp_mutex_wakeup(0xFF3EE8A0)               = 0
/3:     lwp_mutex_lock(0xFF3EE8A0)               = 0
/4:     lwp_self()                         = 4
/4:     lwp_unpark(1, 1)                    = 0
/1:     lwp_park(0x00000000, 0)                    = 0
/4:     munmap(0x03F62000, 57344)               = 0
/4:     lwp_unpark(1, 1)                    = 0
/1:     lwp_park(0x00000000, 0)                    = 0
/1:     priocntlsys(1, 0xFFBFE9BC, 3, 0xFFBFEA9C, 0)     = 16164
/1:     priocntlsys(1, 0xFFBFE9BC, 1, 0xFFBFEA58, 0)     = 6
/1:     getpid()                         = 16164 [16162]
/4:     lwp_park(0x00000000, 0)          (sleeping...)
/3:     lwp_park(0x00000000, 0)          (sleeping...)
/2:     Received signal #2, SIGINT, in sigtimedwait() [caught]
/2:     sigtimedwait(0xFCE7BCD8, 0x00000000, 0x00000000) = SIGINT
/2:     munmap(0x03F72000, 57344)               = 0
/2:     munmap(0x03F82000, 57344)               = 0
/2:     munmap(0x03F92000, 57344)               = 0
/2:     time()                              = 1129292137
/2:     munmap(0x03FA2000, 57344)               = 0
/2:     munmap(0x03FB2000, 57344)

Anjan, I do not use the specific tool set your post is about but the answers to the following questions might help someone zero in on the problem:
During the time that the problem is occurring do any error messages appear in the alert.log?
Did you provide Oracle support a hang analyze dump taken during the problem period? If so, what did support identify that the hang was on?
What do the machine CPU and memory utilization look like during the problem period?
HTH -- Mark D Powell --

Win7 x64 itunes*32.exe process hanged up and window not open

sry,my english not good.
windows 7 x64 and itunes 10.5, after install, itunes*32.exe(Not AppleMobileDeviceService.exe) process hanged up , cpu(1/4 cores) up to 100% .

Sounds stupid, but this will actually work.
1. Quit iTunes.
2. Start an elevated command prompt (Start Menu -> All Programs -> Accessories -> Right Click "Command Prompt" -> "Run as Administrator")
3. Once in the command prompt, type "netsh winsock reset" and hit ENTER.
4. Restart iTunes.
Problem solved.
At least this fixed it for me on my own Windows 7 x64 installation. I had AppleMobileDevice.exe, APSDaemon.exe, and iTunes.exe all at 25% CPU simply from opening up iTunes.
25% CPU for me is 100% CPU per core since I have 4 cores.

Process Hangs on VARI Table

Dear All,
Today suddenly we found that our background process are hangs on VARI table, after some time DIA process also hangs on VARI table.
I also increassed table space PSAPPOOLD.
I search on google but not able to find why processes hangs on VARI table.
Regards
Abhijit

Dear All,
Problem is solved . We restarted the system .
Regards
Abhijit

C++ process hangs when started from Java

I am trying to execute a c++ code from java on a remote Windows machine. In order to deal with the remote part, I have created a Web service from where the actual command is run using Runtime.exec(). The c++ exe is not being called directly from the java code. I have a batch file that eventually calls the exe.
The problem is, both java and c++ processes hang. The java code on server side does handle the output stream and error stream. Also, the c++ code is logging everything in a file on Windows. The strange thing is that, when I remove the WS call and run the java code on server side as a standalone java program, it succeeds. Also, execution of the batch file alone does not hang. Here is the java code:
public class RunCPlusPlusExecutable {
public int runExecutable() {
    int exitValue = 0;
    try {
        Process p = null;
        Runtime rt = Runtime.getRuntime();
        System.out.println("About to execute" + this + rt);
        p = rt.exec("c:/temp/execcplusplus.bat");
        System.out.println("Process HashCode=" + p.hashCode());
        StreamProcessor errorHandler = new StreamProcessor(p.getErrorStream(), "Error");
        StreamProcessor outputHandler = new StreamProcessor(p.getInputStream(), "Output");
        errorHandler.start();
        outputHandler.start();
        exitValue = p.waitFor();
        System.out.println("Exit value : " + exitValue);
        if (exitValue == 0)
            System.out.println("SUCCESS");
        else
            System.out.println("FAILURE");
    } catch (IOException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (Exception e) {
    return exitValue;
class StreamProcessor extends Thread {
    private InputStream is = null;
    private String type = null;
    private InputStreamReader isr = null;
    private BufferedReader br = null;
    private FileWriter writer = null;
    private BufferedWriter out = null;
    StreamProcessor(InputStream is, String type) {
        this.is = is;
        this.type = type;
    public void run() {
        try {
            isr = new InputStreamReader(is);
            br = new BufferedReader(isr);
            writer = new FileWriter("*******path to log file********");
            out = new BufferedWriter(writer);
            String line = null;
            while ((line = br.readLine()) != null) {
                Date date = new Date();
                out.write("[" + type + "]: " + date + " : " + line);
                out.newLine();
            writer.flush();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
                if (isr != null)
                    isr.close();
                if (out != null)
                    out.close();
                if (writer != null)
                    writer.close();
            } catch (IOException e) {
                e.printStackTrace();
String line = null;
            while ((line = br.readLine()) != null) {
                Date date = new Date();
                out.write("[" + type + "]: " + date + " : " + line);
                out.newLine();
            writer.flush();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
                if (isr != null)
                    isr.close();
                if (out != null)
                    out.close();
                if (writer != null)
                    writer.close();
            } catch (IOException e) {
                e.printStackTrace();
The WS server is running from some admin user. And I have been running the standalone java program from some other user. It seems that the c++ executable is giving referenced memory error when being executed from WS call. There are pop-ups citing the error with OK and Cancel buttons(visible when logged in as admin). The error states
The instruction at 0x05473030 referenced memory at 0x000001d4. The memory could not be read
Any idea what is causing the problem and how to debug it? Why does this memory error comes only when the exe is run through WS call? Please note that I won't be able to debug the c++ code and the web service is an apache axis2 service.
Thanks

How can I know? Its your environment, not mine. The only thing we know is that when running the stuff through one path things blow up and when you run them through another path, things don't blow up. User rights is an obvious suspect, but not necessarily the actual problem. Generally when rights are the problem, you get some form of "access denied" exception, not a code hang.
Another likely possibility is that of network settings; perhaps your server goes through a proxy and your local applications do not, or the other way around.
Yet another likely possibility is that the version of Java used is different, or different versions of libraries are no the classpath causing differences in behavior. There is only one way to figure it out: get to know your environment very well and through solid reasoning and experimentation try to figure out where the breaking point is. It all starts with answering this question: what might be different in the environment of the web server, and outside of it? I can't know, only you can. Good luck.

Java mail process hangs

Hi,
I am connecting to exchange server to read the mails. The program works fine but sometimes it just hangs.
The process hangs at "store = session.getStore("imap")".
Any help?
Thanks

Can you get a stack trace when the hang occurs?
The most common cause of hanging is trying to connect to a server that's not up.
You can set timeouts to control that.
But the getStore method is an entirely local method, it should not hang.

Jobserverchild.exe process hanging

Hi
We have installed a new implementation of XIr2. Note that we have an existing implementation which does not do this. We have a setting on the deski job server of Max Jobs Allowed =2. Each time a report is run, it opens a jobserverchild.exe process in Task Manager. If we schedule another report while the first report is running, we get another jobserverchild.exe process. If we schedule multiple reports concurrently, these will continue to use the 2 jobserverchild processes. If all these reports complete, then we schedule another report, the jobserverchild process hangs, and the report stays at status Pending in infoview. If we view the process in Task Manager, the Mem Usage does not change, which indicates the process is hanging. This is causing us severe problems.
Help pls.

Use following method.
u2022 -maxChildReqs <N>
Sets the maximum number of jobs processed by one job server child
before it shuts down and restarts (in case you want a to use a
number between 1 [OUTPROC] and 100 [MIXEDPROC])
Job server children will also automatically shut down if left unused for a
period longer than 2 hours.
http://www.youtube.com/watch?v=WQ8R477SRIA
Thanks,
Anil

Process Hang

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