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Patch Name: PHKL_30317
Patch Description: s700_800 11.11 ufalloc;VxFS3.5;SPP fragmentation;AIO
Creation Date: 04/01/23
Post Date: 04/02/02
Hardware Platforms - OS Releases:
s700: 11.11
s800: 11.11
Products: N/A
Filesets:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP
Automatic Reboot?: Yes
Status: General Superseded
Critical:
Yes
PHKL_30317: HANG
PHKL_29826: PANIC
Debug kernel panics while walking
a list of ~60000 open file
descriptors.
PHKL_25871: HANG
Mutithreaded proceses may hang in socket close(2)
Category Tags:
defect_repair enhancement general_release critical panic
halts_system manual_dependencies
Path Name: /hp-ux_patches/s700_800/11.X/PHKL_30317
Symptoms:
PHKL_30317:
( SR:8606156998 CR:JAGad26332 )
A multithreaded process may hang with one thread inside exit
and another thread continuously looping inside the AIO code.
The stack trace of the thread sleeping in exit code can look
like:
_sleep+0x214
thread_halt_wait+0x198
for_specific_threads+0xc0
process_wide_halt_wait+0x2c
exit+0x3a0
The stack trace of the thread looping inside the AIO code
can look like:
sleep_spinunlock+0x60
aio_shutdown_fd_begin+0x160
close+0x28
PHKL_29826:
( SR:8606326634 CR:JAGae88911 )
Processes get deactivated due to memory pressure.
The processes don't get reactivated even when free
memory is increased. The memory pressure is undue as
there are free memory pages on the superpage pool.
Reports generated using kmeminfo tool show a lot of
memory on the superpage free pool.
( SR:8606306720 CR:JAGae69754 )
When there are ~60000 file descriptors open for a process
then a close on a file descriptor will lead to any
of the below symptoms.
1. panic on a debuf kernel. The stack trace may be
similar to the following.
panic+0x6c
log_ticks+0x31c
set_it+0x170
clock_int+0x2d0
mp_ext_interrupt+0x3f4
ivti_patch_to_nop3+0x0
spinunlock+0x48
vno_lockrelease+0x10c
closef+0x24
close+0xe0
syscall+0x790
syscallrtn+0x0
2. performance loss on a perf kernel.
PHKL_25995:
( SR:8606217733 CR:JAGad86885 ) Duplicate
( SR:8606217874 CR:JAGad87024 ) Duplicate
( SR:8606212631 CR:JAGad81817 )
Enhancement: This product update is a member of a set
needed to enable Fast File Descriptor allocation. The full
list of product updates required for this feature are:
PHKL_25995, PHKL_25993, PHKL_25994, PHKL_25996.
If any member of this set of product updates is not
installed, this product update will have no impact on your
system.
Performance decreases when a large number of file
descriptors are open and as more file descriptors are
needed, there is an increase in the time spent in the
open(2) call.
PHKL_25871:
( SR:8606178928 CR:JAGad48153 )
A process may hang when attempting to perform a close(2) on
a file descriptor created by the socket(2) system call.
PHKL_25611:
( SR:8606222220 CR:JAGad91335 )
This patch is a member of a set of patches needed to enable
the eventport pseudo driver feature delivered in PHKL_25468.
The eventport driver patch specifies the full set of
required patches for this new feature.
If the eventport pseudo driver patch (or superseding patch)
is not installed, this change will have no impact on you
system.
PHKL_29759:
( SR:8606329864 CR:JAGae90987 )
When applications that use chroot() system call are
operated on a directory with the following properties
1. When accessed, autoFS will mount a filesystem
on this directory using direct map.
2. The mount operation has not taken place on this
directory when chroot() is called on it.
many unusual failures are encountered. One such application
is ftp where operations like put, mput, etc., will fail
with an error message when performed on a directory with
the above mentioned properties. An example of such error
message is shown below.
Aug 8 15:17:00 q9j9a ftpd[23183]: Could not determine
cwdir: No such file or directory.
A simple application code in this case will look like the
following.
chroot("/users/nfsu1")
chdir("/dir1")
where "/users/nfsu1" is a direct mount point managed by
AutoFS.
( SR:8606330941 CR:JAGae92062 )
This product update is a member of a set needed to enable
the optional HP-UX VFS-Enh feature.
Upon installation, the HP-UX VFS-Enh bundle (EnhancedVFS)
will install the full set of product updates (including
this one) to enable the VFS-Enh feature.
If the HP-UX VFS-Enh product is not installed, this
product update will have no impact on your system.
PHKL_28999:
( SR:8606295554 CR:JAGae59236 )
Automount fails to mount cdfs with PHKL_26239
and returns EBUSY. The problem is noticed when
mounting non-NFS file systems using direct
maps and not with indirect maps. This problem
can also cause Block-Level Incremental Backups (BLIB)
performed with the Veritas NetBackup application
to fail with errno 16 (EBUSY).
PHKL_27800:
( SR:8606263709 CR:JAGae28034 )
This product update is member of a set needed to enable
the optional HP-UX support for VxFS 3.5 Cluster mount
feature. Upon installation, the HP-UX BaseVxFS bundle
will install the full set of product updates (including
this one) necessary to enable the support for VxFS 3.5
Cluster mount feature.
If the HP-UX VxFS 3.5 product is not installed, this
product update will have no impact on your system.
( SR:8606198319 CR:JAGad67509 )
This product update is member of a set needed to enable
the optional HP-UX VFS support for VxFS 3.5. Upon
Installation, the HP-UX Base VxFS bundle will install the
full set of product updates (including this one) necessary
to enable the VFS support for VxFS 3.5.
If the HP-UX VxFS 3.5 product is not installed, this product
update will have no impact on your system.
PHKL_26239:
( SR:8606247419 CR:JAGae13857 )
Enhancement: This product update is a member of a set
which improve the performance of mount(2) and umount(2).
The full list of product updates that address this
performance improvement are: PHKL_26239, PHKL_26694,
PHKL_26695, PHKL_26698, and PHKL_27211.
Each of these product updates may be installed independently
of the others. Each provides an incremental performance
improvement.
( SR:8606241982 CR:JAGae09237 )
Enhancement: Provide device major numbers that are suitable
for use in /etc/mnttab.
( SR:8606260639 CR:JAGae24962 )
opendir(3C) performance may be quite slow when there are a
lot of directories involving long path names.
( SR:8606178913 CR:JAGad48138 )
Either or both of the following symptoms may appear
on a given system:
1. Service Guard may experience umount(2) failures.
2. System throughput and/or response time may degrade when
CPUs are added to a configuration that executes a
significant number of calls to getcwd(3).
PHKL_23239:
( SR:8606175337 CR:JAGad44579 )
Overall system throughput degradation when getmount_entry()
and getmount_cnt() hit contention for the filesys_sema (an
alpha semaphore).
PHKL_26749:
( SR:8606248238 CR:JAGae14638 )
creat(2) system call fails with ENOENT.
PHKL_26099:
( SR:8606233922 CR:JAGae03145 )
Applications using rename(2) may run slower than necessary.
Defect Description:
PHKL_30317:
( SR:8606156998 CR:JAGad26332 )
The exiting thread was waiting for the thread looping inside
the AIO code to finish. The thread inside the AIO code will
call sleep to let the AIO operation finish. As the process
is exiting the sleep will immediately be interrupted and the
thread loops continuously calling sleep and being
interrupted.
Resolution:
The thread which was looping inside the AIO code sets the
EINTR after it is interrupted from its sleep and returns.
PHKL_29826:
( SR:8606326634 CR:JAGae88911 )
When maxfiles tunable is set to 60000, approximately 15
pages are required for a table of pointers on 64 bit kernel.
These 15 pages are carved from the superpage pool from
a 16 page area, the remaining 1 page gets used by normal
arena allocations. When the 15 pages are freed it cannot
coalesce thus adding an entry on the 8 page free list,
the 4 page free list, the 2 page freelist, and the 1 page
free list. The next time we need 15 pages we must carve up
a new 16 page and the process repeats. Thus leading to
superpage pool fragmentation.
Resolution:
A request for anything between 14 and 16 pages is rounded
up to 16 pages. This will lead to an extra allocation of
maximum 2 pages, but fragmentation of superpage pool will
not happen in case when maxfiles is set to 60000.
( SR:8606306720 CR:JAGae69754 )
When a process has ~60000 open file descriptors and
it does a close on any of the file descriptors, it
walks each file descriptor to check for a flag.
This is done while holding a spinlock. Since the
spinlock is held for a long time, it leads to a
panic on a debug kernel and performance loss on a
perf kernel.
Resolution:
When a lock is acquired on a file, a flag is set.
On first close of the file if the flag is set, the lock
is released for the whole file.
PHKL_25995:
( SR:8606217733 CR:JAGad86885 ) Duplicate
( SR:8606217874 CR:JAGad87024 ) Duplicate
( SR:8606212631 CR:JAGad81817 )
As a user program opens a large number of file descriptors,
more time is spent in the file allocation routines because
of the current linear algorithm which results in a
performance decrease.
Resolution:
The solution to this problem is to implement a more
efficient algorithm for managing file descriptors.
PHKL_25871:
( SR:8606178928 CR:JAGad48153 )
In a mutlithreaded situtation, socket close(2) can cause a
program to hang as a result of a race condition between the
close(2) and the creat(2) of the socket.
Resolution:
Resolution involved several kernel related subsystems. We
now check to see if a thread in waiting in a state that
could cause a process to block and we abort the call to the
routine that would cause a hang. The patches listed in
other dependencies are necessary to allow and detect an
error code that is necessary for detection of the waiting
thread.
PHKL_25611:
( SR:8606222220 CR:JAGad91335 )
This change contains minor enhancements required to support
the eventport feature.
Resolution:
Enhancements added include a file descriptor subsytem
interface used by the eventport driver and respective
eventport driver callbacks.
PHKL_29759:
( SR:8606329864 CR:JAGae90987 )
When the system call chroot() is exercised on a directory
with the following properties
1. When accessed, autoFS will mount a filesystem on this
directory using direct map.
2. The mount operation has not taken place on this
directory when chroot() is called on it.
the effective root directory is not assigned with respect
to the automounted filesystem. This results in many
applications (that use chroot()) failing with different
error messages.
Resolution:
Modified chroot() routine in such a way that the effective
root directory is assigned with respect to the automounted
NFS filesystem.
( SR:8606330941 CR:JAGae92062 )
This product update contains minor enhancements required to
enable the HP-UX VFS-Enh.
Resolution:
This patch enables new functions that will be called by the
HP-UX VFS-Enh.
PHKL_28999:
( SR:8606295554 CR:JAGae59236 )
A flag is incorrectly checked when adding a VFS structure
outside of the normal mount code path. The flag is
properly checked in the normal mount code path, so the
additional check is not needed.
Resolution:
The fix is to remove the check of the flag when adding a
vfs structure.
PHKL_27800:
( SR:8606263709 CR:JAGae28034 )
This product update contains minor enhancements required to
enable the HP-UX support for VxFS 3.5 Cluster mount.
Resolution:
Enhancements added to disallow mounting another file system
within a VxFS 3.5 Cluster mount.
( SR:8606198319 CR:JAGad67509 )
This product update contains minor enhancements required to
enable the HP-UX VFS support for VxFS 3.5.
Resolution:
Enhancements added to remove VxFS 3.5 entries from VFS
switch table.
PHKL_26239:
( SR:8606247419 CR:JAGae13857 )
This product update contains minor changes necessary to
improve the performance of mount(2) and umount(2) for all
file systems. We incorrectly held a lock to serialize all
access to all file systems for mount/umount service calls.
These file systems specific operations are already
serialized where necessary, and the additional higher
level serialization results in unnecessary performance
degradation.
Resolution:
Removed the unnecessary use of a file system lock that used
to unconditionally serialize all access to all file systems
for mount/umount service calls.
( SR:8606241982 CR:JAGae09237 )
Device major numbers are currently assigned the value 0xff.
This value can not be used in /etc/mnttab, which needs a
value between 0x0 and 0x7f.
Resolution:
Provide device major numbers that are in the 0x0 to 0x7f
range.
( SR:8606260639 CR:JAGae24962 )
opendir(3C) uses open(2) and stat(2) calls, each with path
name parameters. With large numbers of directories, there
are multiple calls to open(2) and stat(2).
Resolution:
open(2) already has access to the information provided by
stat(2) to opendir(3C). opendir(3C) uses open(2) with a new
parameter to gain access to this additional information,
thus avoiding the additional call to stat(2).
( SR:8606178913 CR:JAGad48138 )
The mechanism for retrieving information about mounted
file systems from the kernel is extremely inefficient.
Its cost is essentially a quadratic function
of the number of mounted file systems.
Resolution:
Added a new system call to retrieve information for all
currently mounted file systems, which makes the performance
linear with the number of mounted file systems.
PHKL_23239:
( SR:8606175337 CR:JAGad44579 )
It is not efficient to use the alpha semaphore to serialize
access to the list of vfs structs.
Resolution:
Use the rootvfs_lock (a simple spinlock) instead of the
filesys_sema to serialize access to the list of vfs structs.
PHKL_26749:
( SR:8606248238 CR:JAGae14638 )
creat(2) races with unlink(2) allowing a ENOENT failure.
Resolution:
The function that creates a file, vn_create(), was
modified to return a referenced vnode to the open
function, vn_open(), thereby eliminating the original
race with unlink(2).
PHKL_26099:
( SR:8606233922 CR:JAGae03145 )
rename(2) always gets the file system semaphore,
even though it is not needed for mp safe file systems,
which include HFS and JFS.
Resolution:
rename(2) will only get the file system semaphore
for file systems that are not mp safe.
Enhancement:
No (superseded patches contained enhancements)
PHKL_29759:
This patch enables new functions that will be
called by the HP-UX VFS-Enh.
PHKL_27800:
Enhancements added to disallow mounting another
file system within a VxFS 3.5 Cluster mount and to
remove VxFS 3.5 entries from VFS switch table, when
this product is configured.
Additional enhancements were delivered in a patch
this one has superseded. Please review the Defect
Description text for more information.
SR:
8606156998 8606175337 8606178913 8606178928 8606198319
8606212631 8606217733 8606217874 8606222220 8606233922
8606241982 8606247419 8606248238 8606260639 8606263709
8606295554 8606306720 8606326634 8606329864 8606330941
Patch Files:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
/usr/conf/lib/libfs.a(kern_dscrp.o)
/usr/conf/lib/libfs.a(vfs.o)
/usr/conf/lib/libfs.a(vfs_scalls.o)
/usr/conf/lib/libfs.a(vfs_vnode.o)
/usr/conf/lib/libio.a(aio_subr.o)
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
/usr/conf/lib/libfs.a(kern_dscrp.o)
/usr/conf/lib/libfs.a(vfs.o)
/usr/conf/lib/libfs.a(vfs_scalls.o)
/usr/conf/lib/libfs.a(vfs_vnode.o)
/usr/conf/lib/libio.a(aio_subr.o)
what(1) Output:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
/usr/conf/lib/libfs.a(kern_dscrp.o):
kern_dscrp.c $Date: 2004/01/19 21:36:06 $Revision: r
11.11/10 PATCH_11.11 (PHKL_30317)
/usr/conf/lib/libfs.a(vfs.o):
vfs.c $Date: 2003/09/23 11:10:29 $Revision: r11.11/8
PATCH_11.11 (PHKL_29759)
/usr/conf/lib/libfs.a(vfs_scalls.o):
vfs_scalls.c $Date: 2003/12/04 01:20:26 $Revision: r
11.11/6 PATCH_11.11 (PHKL_29826)
/usr/conf/lib/libfs.a(vfs_vnode.o):
vfs_vnode.c $Date: 2002/05/22 10:09:42 $Revision: r1
1.11/4 PATCH_11.11 (PHKL_26239)
/usr/conf/lib/libio.a(aio_subr.o):
aio_subr.c $Date: 2004/01/19 21:36:06 $Revision: r11
.11/1 PATCH_11.11 (PHKL_30317)
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
/usr/conf/lib/libfs.a(kern_dscrp.o):
kern_dscrp.c $Date: 2004/01/19 21:36:06 $Revision: r
11.11/10 PATCH_11.11 (PHKL_30317)
/usr/conf/lib/libfs.a(vfs.o):
vfs.c $Date: 2003/09/23 11:10:29 $Revision: r11.11/8
PATCH_11.11 (PHKL_29759)
/usr/conf/lib/libfs.a(vfs_scalls.o):
vfs_scalls.c $Date: 2003/12/04 01:20:26 $Revision: r
11.11/6 PATCH_11.11 (PHKL_29826)
/usr/conf/lib/libfs.a(vfs_vnode.o):
vfs_vnode.c $Date: 2002/05/22 10:09:42 $Revision: r1
1.11/4 PATCH_11.11 (PHKL_26239)
/usr/conf/lib/libio.a(aio_subr.o):
aio_subr.c $Date: 2004/01/19 21:36:06 $Revision: r11
.11/1 PATCH_11.11 (PHKL_30317)
cksum(1) Output:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
836686066 30884 /usr/conf/lib/libfs.a(kern_dscrp.o)
1676509853 24928 /usr/conf/lib/libfs.a(vfs.o)
3514902918 36732 /usr/conf/lib/libfs.a(vfs_scalls.o)
3375252371 10904 /usr/conf/lib/libfs.a(vfs_vnode.o)
2368329161 14160 /usr/conf/lib/libio.a(aio_subr.o)
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
2563672440 70096 /usr/conf/lib/libfs.a(kern_dscrp.o)
3047609636 69784 /usr/conf/lib/libfs.a(vfs.o)
2524596217 94792 /usr/conf/lib/libfs.a(vfs_scalls.o)
791159007 25792 /usr/conf/lib/libfs.a(vfs_vnode.o)
4262437474 32840 /usr/conf/lib/libio.a(aio_subr.o)
Patch Conflicts: None
Patch Dependencies:
s700: 11.11: PHCO_27120
s800: 11.11: PHCO_27120
Hardware Dependencies: None
Other Dependencies:
PHKL_25995:
To enable the Fast File Descriptor Allocation enhancement,
the following product updates must be installed:
PHKL_25993, PHKL_25994, PHKL_25995, PHKL_25996. These
product updates may be installed in any order. If any of
these product updates are not installed, this patch
will have no impact on your system.
PHKL_25871: To enable the changes required to fix
JAGad48153, the following must also be installed:
PHKL_25840, PHKL_25842, PHNE_25644, PHNE_25084. These
product updates may be installed in any order. If any of
these product updates are not installed, this patch will
have no impact on your system.
PHKL_26239: This product update, along with PHCO_27910
(libc) and PHKL_26467 (new system call), provide the
enabling performance enhancement for accessing information
about mounted file systems. The following set of product
updates: PHCO_26242, PHCO_27120, PHCO_26331, PHCO_26332,
PHCO_26333 and PHCO_26334 each take advantage of this
performance enhancement, and thus provide incremental
performance improvements. Each of these product updates may
be installed independently of each other, and in any order.
The three enabling product updates, plus at least one of the
others are necessary to see an improvement in performance.
None are required if this enhancement is not desired.
PHKL_26239: opendir(3C) performance requires product update
PHCO_27910 (libc). Each of these product updates may be
installed independently of each other, in any order, or
not at all if this enhancement is not desired.
Supersedes:
PHKL_29826 PHKL_29759 PHKL_28999 PHKL_27800 PHKL_26749 PHKL_26239
PHKL_26099 PHKL_25995 PHKL_25871 PHKL_25611 PHKL_23239
Equivalent Patches: None
Patch Package Size: 200 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_30317
5. Run swinstall to install the patch:
swinstall -x autoreboot=true -x patch_match_target=true \
-s /tmp/PHKL_30317.depot
By default swinstall will archive the original software in
/var/adm/sw/save/PHKL_30317. If you do not wish to retain a
copy of the original software, include the patch_save_files
option in the swinstall command above:
-x patch_save_files=false
WARNING: If patch_save_files is false when a patch is installed,
the patch cannot be deinstalled. Please be careful
when using this feature.
For future reference, the contents of the PHKL_30317.text file is
available in the product readme:
swlist -l product -a readme -d @ /tmp/PHKL_30317.depot
To put this patch on a magnetic tape and install from the
tape drive, use the command:
dd if=/tmp/PHKL_30317.depot of=/dev/rmt/0m bs=2k
Special Installation Instructions: None
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