From: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> |
---|---|
To: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Oleg Jurtšenko <oleg(dot)jurtsenko(at)fts(dot)ee>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #5235: Segmentation fault under high load through JDBC |
Date: | 2009-12-09 14:11:13 |
Message-ID: | 4B1FB001.9000004@kaltenbrunner.cc |
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Lists: | pgsql-bugs |
Andrew Gierth wrote:
>>>>>> "Robert" == Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>
> Robert> How about (3) getrlimit(RLIMIT_STACK) lies through its teeth,
> Robert> by ignoring the existence of another and lower limit imposed
> Robert> elsewhere?
>
> Robert> A little Googling seems to reveal that FreeBSD has a
> Robert> parameter called MAXSSIZ (and possibly a variant for 64-bit
> Robert> builds). I kind find a lot of people talking about needing
> Robert> to raise it (for MySQL, among other things), but I haven't
> Robert> been able to determine for certain what the default is.
> Robert> Perhaps it is set to a really low value on the OP's system?
>
> The default is 64MB on i386, 512MB on amd64; that's where the
> getrlimit value comes from unless it's been explicitly reduced
> somewhere. The kernel MAXSSIZ sets the value of the hard limit for
> RLIMIT_STACK for proc0, and everything else inherits that. All
> setrlimit calls for RLIMIT_STACK are explicitly clamped to MAXSSIZ, so
> there's no way to set that value higher than the kernel limit, and no
> way for getrlimit to report a value higher than the real limit.
I vaguely recall issues in the past with linking of postgresql (or PLs
that require it) against libc_r causing some rather small stack limits
being imposed under some circumstances but I don't recall the details
any more...
Stefan
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