Hi, On Sat, Mar 25, 2023 at 12:47:17PM -0700, Alexei Starovoitov wrote: > On Sat, Mar 25, 2023 at 7:55 AM Florian Lehner <dev@xxxxxxxxxxx> wrote: > > > > With this patch applied on top of bpf/bpf-next (55fbae05) the system no longer runs into a total freeze as reported in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033398. > > > > Tested-by: Florian Lehner <dev@xxxxxxxxxxx> > > Thanks for testing and for bumping the thread. > The fix slipped through the cracks. > > Looking at the stack trace in bugzilla the patch set > should indeed fix the issue, since the kernel is deadlocking on: > copy_from_user_nofault -> check_object_size -> find_vmap_area -> spin_lock > > I'm travelling this and next week, so if you can take over > the whole patch set and roll in the tweak that was proposed back in January: > > - if (is_vmalloc_addr(ptr)) { > + if (is_vmalloc_addr(ptr) && !pagefault_disabled()) > > and respin for the bpf tree our group maintainers can review and apply > while I'm travelling. Anyone can pick it up as suggested by Alexei, and propose that to the bpf tree maintainers? Regards, Salvatore
