Kernel freeze on AMD FX-9590 CPU during I/O

Kernel freeze on AMD FX-9590 CPU during I/O

[Dmitrii Tcvetkov]

Hello,

Since linux kernel 4.14-rc1 almost any I/O has a chance to freeze kernel
(no log in /dev/tty0 nor /dev/ttyS0 not netconsole, no ARP answer over
network) on one of my machines. Compiling linux kernel reproduces the
issue reliably so far.

Bisecting between v4.13 and v4.14-rc1 led me to commit
94b1b03b519b81c494900cb112aa00ed205cc2d9
Also I created a bug in bugzilla, bisect log is attached there:
https://bugzilla.kernel.org/show_bug.cgi?id=197209

Unfortunately I can't test reverting of the commit on current mainline
due to revert conflicts and I don't know how to resolve them correctly.

My machine:
CPU: AMD FX-9590
RAM: non-ECC DDR 12 Gb
Storage layout: btrfs on top LVM on top LUKS on top HDD

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Re: Kernel freeze on AMD FX-9590 CPU during I/O

[Borislav Petkov]

On Thu, Oct 12, 2017 at 11:01:24PM +0300, Dmitrii Tcvetkov wrote:
> Hello,
> 
> Since linux kernel 4.14-rc1 almost any I/O has a chance to freeze kernel
> (no log in /dev/tty0 nor /dev/ttyS0 not netconsole, no ARP answer over
> network) on one of my machines. Compiling linux kernel reproduces the
> issue reliably so far.
> 
> Bisecting between v4.13 and v4.14-rc1 led me to commit
> 94b1b03b519b81c494900cb112aa00ed205cc2d9

There's a candidate fix in case you wanna try it:

https://lkml.kernel.org/r/8eccc9240041ea7cb94624cab8d07e2a6e911ba7.1507567665.git.luto@kernel.org

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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