| From: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, amul sul <sul_amul(at)yahoo(dot)co(dot)in>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Server crash due to SIGBUS(Bus Error) when trying to access the memory created using dsm_create(). |
| Date: | 2017-09-25 21:34:50 |
| Message-ID: | CAEepm=3mdh7bHARBFFqPrMsJR+sC4WnWn+Xf9Fr-c_K7+J3XUA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Sep 26, 2017 at 10:12 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> writes:
>> I think the problem here is that posix_fallocate() doesn't set errno.
>
> Huh. So the fact that it worked for me is likely because glibc's
> emulation *does* allow errno to get set.
>
>> Will write a patch.
>
> Thanks, I'm out of time for today.
See attached, which also removes the ENOSYS stuff which I believe to
be now useless. Does this make sense? Survives make check-world and
my simple test procedure on a
3.10.0-327.36.1.el7.x86_64 system.
postgres=# select test_dsm(1000000000000);
ERROR: could not resize shared memory segment
"/PostgreSQL.2043796572" to 1000000000000 bytes: No space left on
device
postgres=# select test_dsm(1000);
test_dsm
----------
(1 row)
--
Thomas Munro
http://www.enterprisedb.com
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-Fix-error-handling-for-posix_fallocate.patch | application/octet-stream | 1.9 KB |
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