sysbench error message accesses uninitialized memory

[akopytov]

This is a copy of https://bugs.launchpad.net/sysbench/+bug/1529742

FATAL: Cannot open file errno = 24 ((
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FATAL: Cannot open file errno = 24 (8�6k�)

FATAL: Cannot open file errno = 24 (��
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[akopytov]

I'm unable to reproduce this. This is on Ubuntu 14.10 in a read-only directory:

user@ubuntu:/tmp/test$ ~/src/git/sysbench/sysbench/sysbench --test=fileio prepare
sysbench 0.5: multi-threaded system evaluation benchmark

128 files, 16384Kb each, 2048Mb total
Creating files for the test...
Extra file open flags: 0
FATAL: Can't open file errno = 13 (Permission denied)

[chadmiller]

Perhaps it's the path up to this. Create more data files than your ulimit (-n) has the ability to open. For me, this was

sysbench --num-threads=16 --test=fileio --file-total-size=1300G --file-test-mode=rndrw --file-num=13000

[akopytov]

Still can't repeat:

user@ubuntu:/tmp/test$ ulimit -n 50
user@ubuntu:/tmp/test$ ~/src/git/sysbench/sysbench/sysbench --test=fileio --file-test-mode=rndrw run
...
Doing random r/w test
FATAL: Cannot open file errno = 24 (Too many open files)

I'll try more ways to repeat that. What's the OS version in your setup?

[chadmiller]

Ubuntu xenial, to be 16.04. sysbench version 0.4.12-1.1 from Debian.

I can still reproduce even with sources. Looks to me like
strerror_r(old_errno, errbuf, sizeof(errbuf));
doesn't fill errbuf. I thought it could be because of an attempt to open
gettext files, but strace doesn't bear that out.

I'll look more later.

On Tue, Dec 29, 2015 at 9:55 AM, Alexey Kopytov notifications@github.com
wrote:

Still can't repeat:

user@ubuntu:/tmp/test$ ulimit -n 50
user@ubuntu:/tmp/test$ ~/src/git/sysbench/sysbench/sysbench --test=fileio --file-test-mode=rndrw run
...
Doing random r/w test
FATAL: Cannot open file errno = 24 (Too many open files)

I'll try more ways to repeat that. What's the OS version in your setup?

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#16 (comment).

Chad Miller
chad.org

[akopytov]

Closing, feel free to reopen if can provide more details.