On 06/22/2012 09:39 PM, Tom Lane wrote:
> Andres Freund <and...@2ndquadrant.com> writes:
>> On Friday, June 22, 2012 08:51:55 PM Robert Haas wrote:
>>> I remarked to Stefan that the symptoms seem consistent with the idea
>>> that the children have signals blocked.  But I don't know how that
>>> could happen.
> 
>> You cannot block sigkill.
> 
> sigterm is at issue, not sigkill.  But I don't care for the
> signals-blocked theory either, at least not in three different children
> at the same time.
> 
> (Hey Stefan, is there a way on BSD to check a process's signals-blocked
> state from outside?  If so, next time this happens you should try to
> determine the children's signal state.)

with help from RhodiumToad on IRC:

#  ps -o pid,sig,sigcatch,sigignore,sigmask,command -p 12480

  PID  PENDING   CAUGHT  IGNORED  BLOCKED COMMAND
12480 20004004 34084005 c942b002 fffefeff postgres: writer process
(postgres)

#  ps -o pid,sig,sigcatch,sigignore,sigmask,command -p 9841
  PID  PENDING   CAUGHT  IGNORED  BLOCKED COMMAND
 9841 20004004 34084007 c942b000 fffefeff postgres: wal writer process
  (postgres)


Stefan

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