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Re: kern/39420: stopped processes can hold locks

The following reply was made to PR kern/39420; it has been noted by GNATS.

From: David Holland <>
To: YAMAMOTO Takashi <>
Subject: Re: kern/39420: stopped processes can hold locks
Date: Sat, 11 Oct 2008 23:11:48 +0000

 On Thu, Oct 02, 2008 at 08:12:35AM +0900, YAMAMOTO Takashi wrote:
  > > >Number:         39420
  > > >Category:       kern
  > > >Synopsis:       stopped processes can hold locks
  > are you using interruptible nfs mount?
  > in that case, nfs uses PCATCH/cv_wait_sig for I/O and can be
  > suspended by user.
  > ups@ suggested introducing something like PCATCH|PNOSUSPEND while ago.
  > i think that an alternative is not suspending LWPs in the middle of
  > sleepq_block.  ie. suspend LWPs only on user-kernel boundaries.
 I think that's a much better alternative. I don't think it's safe to
 suspend anything except at the user-kernel boundary. It's easy enough
 to use EINTR/ERESTARTSYS to get the LWPs there when necessary.
 When I looked into this before it appeared like it would require
 nontrivial changes, but I think I was probably missing something.
 David A. Holland

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