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.
