On Tue, Feb 25, 2025 at 12:57:37PM +0100, Oleg Nesterov wrote: > On 02/24, Oleg Nesterov wrote: > > > > Just in case, did you use > > > > https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git/tree/src/hackbench/hackbench.c > > > > ? > > Or did you use another version? > > Exactly what parameters did you use? > > If possible, please reproduce the hang again. How many threads/processes > sleeping in pipe_read() or pipe_write() do you see? (you can look at > /proc/$pid/stack). > > Please pick one sleeping writer, and do > > $ strace -p pidof_that_write > > this should wake this writer up. If a missed wakeup is the only problem, > hackbench should continue. > > The more info you can provide the better ;) I was also able to reproduce the hackbench hang with the parameters mentioned earlier (threads and processes) on the kernel from master. -- Rgrds, legion
