Re: Deadlock in vtime_account_user() vs itself across a page fault

2014-09-11 Thread Frederic Weisbecker
On Thu, Sep 11, 2014 at 11:54:34PM +0100, David Howells wrote: > > Whilst trying to use docker, I'm occasionally seeing the attached deadlock in > user time accounting, with a page fault in the middle. The relevant lines > from the pre-fault bits of stack: > > [] ? cpuacct_account_field+0x

Deadlock in vtime_account_user() vs itself across a page fault

2014-09-11 Thread David Howells
Whilst trying to use docker, I'm occasionally seeing the attached deadlock in user time accounting, with a page fault in the middle. The relevant lines from the pre-fault bits of stack: [] ? cpuacct_account_field+0x65/0x9a (gdb) i li *0x8106d954 Line 272 of "../ke