On 02/11/15 08:52, Richard Weinberger wrote: > Am 02.11.2015 um 09:41 schrieb Anton Ivanov: >> On 02/11/15 08:37, Richard Weinberger wrote: >>> Hi! >>> >>> Am 02.11.2015 um 09:14 schrieb Anton Ivanov: >>>> I was testing under similar conditions (CPU pinning using taskset -c 0 on >>>> a multicore). >>>> >>>> I have removed it and run some retests - I cannot reproduce the hang at >>>> this point with my config >>>> >>>> I am going to run a defconfig and compare the results to see if this will >>>> give me any insights on the root cause. >>> I can reproduce on both my build machine (8 core) and my laptop (4 core). >>> If it helps I can share the rootfs. >>> >>> On my laptop I was able to reproduce within 5 minutes. >>> 1. make defconfig ARCH=um >>> 2. make -j 4 linux ARCH=um >>> 3. ./linux ubda=../Downloads/Debian-Squeeze-AMD64-root_fs mem=1G >>> 4. login to tty0 >>> 5. wait a few minutes >>> 6. try to run top, it will hang in nanosleep >> Pretty much the same. Does not hang, multiple test runs. Userspace is a >> relatively full install of a debian jessie. >> >> I ran deconfig and did a diff. The prime suspect differences between my >> config and defconfig are stack order 3 (not 1) and io sched of cfq, not >> deadline. >> >> I am going to retest just with these first to see if one of them is the >> culprit, if that does not make a difference, run it with defconfig and try >> to reproduce the hang. > I'm pretty sure that you don't see the issue as your Jessy userspace uses > nanosleep periodically.
There are quite a few things running so this may indeed be the case. What do you use for userspace (so I can try to reproduce this and debug it)? A. > > Thanks, > //richard > ------------------------------------------------------------------------------ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
