On 2021/7/22 22:00, Greg KH wrote: > On Thu, Jul 22, 2021 at 03:26:52PM +0200, Greg KH wrote: >> On Thu, Jul 22, 2021 at 01:36:02PM +0100, Matthew Wilcox wrote: >>> On Thu, Jul 22, 2021 at 04:57:57PM +0800, Zhouyi Zhou wrote: >>>> Thanks for reviewing, >>>> >>>> What I have deduced from the dmesg is: >>>> In function do_swap_page, >>>> after invoking >>>> 3385 si = get_swap_device(entry); /* rcu_read_lock */ >>>> and before >>>> 3561 out: >>>> 3562 if (si) >>>> 3563 put_swap_device(si); >>>> The thread got scheduled out in >>>> 3454 locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags); >>>> >>>> I am only familiar with Linux RCU subsystem, hope mm people can solve our >>>> confusions. >>> >>> I don't understamd why you're still talking. The problem is understood. >>> You need to revert the unnecessary backport of 2799e77529c2 and >>> 2efa33fc7f6e >> >> Sorry for the delay, will go do so in a minute... > > Both now reverted from 5.10.y and 5.13.y. > I browsed my previous backport notifying email and found that these two patches are also backported into 5.12. And it seems it's missed. Thanks. > thanks, > > greg k-h > . >
