BIND 9.16.1 on CentOS 6

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BIND 9.16.1 on CentOS 6

Anand Buddhdev
Hi BIND developers,

The 9.16.1 release notes say:

"The system-provided POSIX Threads read-write lock implementation is now
used by default instead of the native BIND 9 implementation. Please be
aware that glibc versions 2.26 through 2.29 had a bug that could cause
BIND 9 to deadlock. A fix was released in glibc 2.30, and most current
Linux distributions have patched or updated glibc, with the notable
exception of Ubuntu 18.04 (Bionic) which is a work in progress. If you
are running on an affected operating system, compile BIND 9 with
--disable-pthread-rwlock until a fixed version of glibc is available."

CentOS 6 has an older glibc version, 2.12. Is it safe to compile BIND on
CentOS 6 with the system read-write lock implementation?

Regards,
Anand
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Re: BIND 9.16.1 on CentOS 6

Ondřej Surý
Hi Anand,

yes, it is.  The broken code was introduced in the glibc 2.26, and generally
RedHat/CentOS/Fedora/Debian libc6 already has the required patches.

Ubuntu 18.04 (and derivatives) is the only major Linux distribution that
doesn’t have the patch yet.

Ondrej
--
Ondřej Surý
[hidden email]

> On 18 Mar 2020, at 15:33, Anand Buddhdev <[hidden email]> wrote:
>
> Hi BIND developers,
>
> The 9.16.1 release notes say:
>
> "The system-provided POSIX Threads read-write lock implementation is now
> used by default instead of the native BIND 9 implementation. Please be
> aware that glibc versions 2.26 through 2.29 had a bug that could cause
> BIND 9 to deadlock. A fix was released in glibc 2.30, and most current
> Linux distributions have patched or updated glibc, with the notable
> exception of Ubuntu 18.04 (Bionic) which is a work in progress. If you
> are running on an affected operating system, compile BIND 9 with
> --disable-pthread-rwlock until a fixed version of glibc is available."
>
> CentOS 6 has an older glibc version, 2.12. Is it safe to compile BIND on
> CentOS 6 with the system read-write lock implementation?
>
> Regards,
> Anand
> _______________________________________________
> Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list
>
> bind-users mailing list
> [hidden email]
> https://lists.isc.org/mailman/listinfo/bind-users

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Re: BIND 9.16.1 on CentOS 6

Anand Buddhdev
Thank you for your swift and clear response Ondrej!

Regards,
Anand

On 18/03/2020 15:35, Ondřej Surý wrote:

> Hi Anand,
>
> yes, it is.  The broken code was introduced in the glibc 2.26, and generally
> RedHat/CentOS/Fedora/Debian libc6 already has the required patches.
>
> Ubuntu 18.04 (and derivatives) is the only major Linux distribution that
> doesn’t have the patch yet.
>
> Ondrej
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