04-23-2019
Actually I expect gdb to also get hung when attaching it to a process in D state. But it's worth a trial.
If processes are permanently hung in cifs_reconnect_tcon then it looks like a kernel bug (or a missing interrupt/timeout feature).
Is your kernel at the latest patch level?
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LEARN ABOUT HPUX
ipmi_watchdog_action
ipmi_watchdog_action(5) File Formats Manual ipmi_watchdog_action(5)
NAME
ipmi_watchdog_action - sets action taken if IPMI watchdog timer expires
VALUES
Failsafe
Default
Allowed values
Recommended values
The value used depends on what the system administrator wants to happen if the system can not make forward progress.
DESCRIPTION
The tunable sets the watchdog timer expiration action on systems with the IPMI (Intelligent Platform Management Interface) watchdog timer.
To tell if a system has this feature use If is listed, the IPMI watchdog timer is supported.
HP's Itanium Product Family systems and recent PA RISC systems use IPMI as part of the system manageability infrastructure. IPMI uses a
"watchdog timer" to detect conditions where the operating system has hung or is not responding. The action configured using the tunable
will take place automatically when this situation occurs.
For instance, if set to the system (or partition, on cellular systems) will hard reset if the OS is hung or not responding.
Who Is Expected to Change This Tunable?
System administrators that want the system to take an action if system forward progress stops.
Restrictions on Changing
None. This tunable is dynamic.
What Other Tunable Values Should Be Changed at the Same Time?
None.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of
HP-UX.
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by HP.
SEE ALSO
kctune(1M), sam(1M), gettune(2), settune(2).
Tunable Kernel Parameters ipmi_watchdog_action(5)