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. 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
