Re: kern/39420: stopped processes can hold locks

To: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/39420: stopped processes can hold locks
From: yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)
Date: Thu, 2 Oct 2008 08:12:35 +0900 (JST)

> >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.

YAMAMOTO Takashi

Follow-Ups:
- Re: kern/39420: stopped processes can hold locks
  - From: David Holland

References:
- kern/39420: stopped processes can hold locks
  - From: dholland

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