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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Mon, 14 Feb 2005 16:24:40 +0000
In-Reply-To: <20050214155630.GB6395@ay.vinc17.org>
Comments: In reply to Vincent Lefevre <vincent@vinc17.org>
        "Re: History corruption (over NFS)" (Feb 14,  4:56pm)
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	<20050214155630.GB6395@ay.vinc17.org>
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Subject: Re: History corruption (over NFS)
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On Feb 14,  4:56pm, Vincent Lefevre wrote:
} Subject: Re: History corruption (over NFS)
}
} The "noac" didn't change anything (except making command execution
} slower).
} 
} If I've understood correctly, the first "ssh priam" started a zsh that
} truncated the history file (since its size was above the limit). Note
} that I quit this shell immediately. Then the current zsh instances
} went on writing to the history file without noticing that it had been
} truncated, hence the null bytes.

Try changing from "noac" to an explicit "hard".  I wouldn't have thought
this was needed in a modern NFS environment, but the symptoms sure look
familiar.