On Wed, Feb 23, 2022 at 10:50:09PM -0500, Theodore Ts'o wrote:
> On Thu, Feb 24, 2022 at 12:48:42PM +1100, Dave Chinner wrote:
> > > Fair enough; on the other hand, we could also view this as making ext4
> > > more robust against buggy code in other subsystems, and while other
> > > file systems
On Wed, Feb 23, 2022 at 04:44:07PM -0800, John Hubbard wrote:
>
> Actually...I can confirm that real customers really are doing *exactly*
> that! Despite the kernel crashes--because the crashes don't always
> happen unless you have a large (supercomputer-sized) installation. And
> even then it
On Thu, Feb 24, 2022 at 12:48:42PM +1100, Dave Chinner wrote:
> > Fair enough; on the other hand, we could also view this as making ext4
> > more robust against buggy code in other subsystems, and while other
> > file systems may be losing user data if they are actually trying to do
> > remote
On Wed, Feb 23, 2022 at 06:35:54PM -0500, Theodore Ts'o wrote:
> On Fri, Feb 18, 2022 at 08:51:54AM +0100, Greg Kroah-Hartman wrote:
> > > The challenge is that fixing this "the right away" is probably not
> > > something we can backport into an LTS kernel, whether it's 5.15 or
> > > 5.10... or
On Fri, Feb 18, 2022 at 08:51:54AM +0100, Greg Kroah-Hartman wrote:
> > The challenge is that fixing this "the right away" is probably not
> > something we can backport into an LTS kernel, whether it's 5.15 or
> > 5.10... or 4.19.
>
> Don't worry about stable backports to start with. Do it the
On Thu, Feb 17, 2022 at 10:33:34PM -0800, John Hubbard wrote:
>
> Just a small thing I'll say once, to get it out of my system. No action
> required here, I just want it understood:
>
> Before commit 803e4572d7c5 ("mm/process_vm_access: set FOLL_PIN via
> pin_user_pages_remote()"), you would
On Thu, Feb 17, 2022 at 11:08:38PM -0500, Theodore Ts'o wrote:
> On Thu, Feb 17, 2022 at 05:06:45PM -0800, John Hubbard wrote:
> > Yes. And looking at the pair of backtraces below, this looks very much
> > like another aspect of the "get_user_pages problem" [1], originally
> > described in Jan
On Fri, Feb 18, 2022 at 04:24:20AM +, Matthew Wilcox wrote:
> On Thu, Feb 17, 2022 at 09:54:30PM -0500, Theodore Ts'o wrote:
> > process_vm_writev() uses [un]pin_user_pages_remote() which is the same
> > interface uses for RDMA. But it's not clear this is ever supposed to
> > work for memory
On Thu, Feb 17, 2022 at 09:54:30PM -0500, Theodore Ts'o wrote:
> process_vm_writev() uses [un]pin_user_pages_remote() which is the same
> interface uses for RDMA. But it's not clear this is ever supposed to
> work for memory which is mmap'ed region backed by a file.
> pin_user_pages_remote()
On Thu, Feb 17, 2022 at 05:06:45PM -0800, John Hubbard wrote:
> Yes. And looking at the pair of backtraces below, this looks very much
> like another aspect of the "get_user_pages problem" [1], originally
> described in Jan Kara's 2018 email [2].
Hmm... I just posted my analysis, which tracks
On Wed, Feb 16, 2022 at 04:31:36PM +, Lee Jones wrote:
>
> After recently receiving a bug report from Syzbot [0] which was raised
> specifically against the Android v5.10 kernel, I spent some time
> trying to get to the crux. Firstly I reproduced the issue on the
> reported kernel, then did
Good afternoon,
After recently receiving a bug report from Syzbot [0] which was raised
specifically against the Android v5.10 kernel, I spent some time
trying to get to the crux. Firstly I reproduced the issue on the
reported kernel, then did the same using the latest release kernel
v5.16.
The
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