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Re: kern/42228: Kernel deadlock prevents further file system access

The following reply was made to PR kern/42228; it has been noted by GNATS.

From: Manuel Bouyer <>
Subject: Re: kern/42228: Kernel deadlock prevents further file system access
Date: Sun, 25 Oct 2009 14:50:25 +0100

 On Sun, Oct 25, 2009 at 12:10:01PM +0000, wrote:
 > >Description:
 > My NetBSD/amd64 5.0/5.0_STABLE server has locked up at multiple occasions.
 > The symptoms are always identical:
 > 1.) The system still responds to ICMP Echo packets.
 > 2.) Services that don't access the file system (frequently) like e.g.
 >     BIND still work.
 > 3.) Any other processes (Postfix, Apache, inetd, etc.) are stuck.
 > I have to recover the machine by dropping into "ddb" and using "sync"
 > or "reboot" to force a restart.
 > The system managed to write a crash dump (to "raid0b" in case it
 > matters) after several of the crashes but "savecore" always claims
 > there is no crash dump once the system is back up. The only debug
 > information I therefore have is the stack trace of multiple of
 > the hung process after the latest incident. The stack traces all
 > look like this:
 > sleepq_block
 > turnstile_block
 > rw_vector_enter
 > vlockmgr
 > vn_lock
 > namei
 > The function after "namei" differs from case to case. Examples are
 > vn_open() or do_sys_stat().
 this looks a lot like the ffs VOP_RENAME race issue.
 Manuel Bouyer <>
      NetBSD: 26 ans d'experience feront toujours la difference

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