Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-20 Thread Greg Kroah-Hartman
On Wed, May 15, 2019 at 08:20:35AM -0700, Matthew Wilcox wrote: > On Wed, May 15, 2019 at 05:04:06PM +0200, Greg Kroah-Hartman wrote: > > > Greg, can you consider 6daef95b8c914866a46247232a048447fff97279 for > > > backporting to stable? Nobody realised it was a bugfix at the time it > > > went

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-16 Thread Lech Perczak
W dniu 15.05.2019 o 17:18, Matthew Wilcox pisze: > On Wed, May 15, 2019 at 08:02:17AM -0700, Eric Dumazet wrote: >> On Wed, May 15, 2019 at 7:43 AM Matthew Wilcox wrote: >>> You're seeing a race between page_address(page) being called twice. >>> Between those two calls, something has caused the

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Greg Kroah-Hartman
On Wed, May 15, 2019 at 08:20:35AM -0700, Matthew Wilcox wrote: > On Wed, May 15, 2019 at 05:04:06PM +0200, Greg Kroah-Hartman wrote: > > > Greg, can you consider 6daef95b8c914866a46247232a048447fff97279 for > > > backporting to stable? Nobody realised it was a bugfix at the time it > > > went

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Matthew Wilcox
On Wed, May 15, 2019 at 05:04:06PM +0200, Greg Kroah-Hartman wrote: > > Greg, can you consider 6daef95b8c914866a46247232a048447fff97279 for > > backporting to stable? Nobody realised it was a bugfix at the time it > > went in. I suspect there aren't too many of us running HIGHMEM kernels > > any

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Matthew Wilcox
On Wed, May 15, 2019 at 08:02:17AM -0700, Eric Dumazet wrote: > On Wed, May 15, 2019 at 7:43 AM Matthew Wilcox wrote: > > You're seeing a race between page_address(page) being called twice. > > Between those two calls, something has caused the page to be removed from > > the page_address_map()

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Greg Kroah-Hartman
On Wed, May 15, 2019 at 07:43:52AM -0700, Matthew Wilcox wrote: > > > W dniu 25.04.2019 o 11:25, Lech Perczak pisze: > > >> Some time ago, after upgrading the Kernel on our i.MX6Q-based boards to > > >> mainline 4.18, and now to LTS 4.19 line, during stress tests we started > > >> noticing

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Eric Dumazet
On Wed, May 15, 2019 at 7:43 AM Matthew Wilcox wrote: > > > > W dniu 25.04.2019 o 11:25, Lech Perczak pisze: > > >> Some time ago, after upgrading the Kernel on our i.MX6Q-based boards to > > >> mainline 4.18, and now to LTS 4.19 line, during stress tests we started > > >> noticing strange

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Matthew Wilcox
> > W dniu 25.04.2019 o 11:25, Lech Perczak pisze: > >> Some time ago, after upgrading the Kernel on our i.MX6Q-based boards to > >> mainline 4.18, and now to LTS 4.19 line, during stress tests we started > >> noticing strange warnings coming from 'read' syscall, when > >> page_copy_sane()

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-05-15 Thread Lech Perczak
Hi, W dniu 26.04.2019 o 10:42, Lech Perczak pisze: > Cc linux...@kvack.org > > W dniu 25.04.2019 o 11:25, Lech Perczak pisze: >> Hello, >> >> Some time ago, after upgrading the Kernel on our i.MX6Q-based boards to >> mainline 4.18, and now to LTS 4.19 line, during stress tests we started >>

Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-04-26 Thread Lech Perczak
Cc linux...@kvack.org W dniu 25.04.2019 o 11:25, Lech Perczak pisze: > Hello, > > Some time ago, after upgrading the Kernel on our i.MX6Q-based boards to > mainline 4.18, and now to LTS 4.19 line, during stress tests we started > noticing strange warnings coming from 'read' syscall, when

Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop_caches

2019-04-25 Thread Lech Perczak
Hello, Some time ago, after upgrading the Kernel on our i.MX6Q-based boards to mainline 4.18, and now to LTS 4.19 line, during stress tests we started noticing strange warnings coming from 'read' syscall, when page_copy_sane() check failed. Typical reproducibility is up to ~4 events per 24h.