RE: Deadlock with restart_syscall()

2018-07-30 Thread André Pribil
> Don't do control operations from RT processes! > There can be cases of priority inversion where RT process is waiting > for > something that requires a kthread to complete the operation. I have RT throttling activated and I thought it would kick-in and give the non-RT threads some time to execu

Re: Deadlock with restart_syscall()

2018-07-27 Thread Stephen Hemminger
On Mon, 16 Jul 2018 09:31:06 +0200 André Pribil wrote: > Hello, > > I'm using kernel 4.14.52-rt34 on a single core ARM system and I'm seeing a > deadlock inside the kernel when two RT processes make calls in the right > temporal distance. The first process is trying to bring the Ethernet > in

RE: Deadlock with restart_syscall()

2018-07-27 Thread André Pribil
> I've found this thread, where a similar issue with restart_syscall() > has been reported: > https://www.spinics.net/lists/netdev/msg415144.html Found another old report about restart_syscall() producing a dead loop: https://lists.gt.net/linux/kernel/2371438 I do not agree with the conclusion th