> > But in the core dump case there is no return to user. The process is being > > terminated by the signal that leads to this core dump. So even though you > > may consider the page being accessed to be a "user" page, you can't fix > > it by queueing work to run on return to user. > > For coredump，the task work will be called too, see following code, > > get_signal > sig_kernel_coredump > elf_core_dump > dump_user_range > _copy_from_iter // with MC-safe copy, return without panic > do_group_exit(ksig->info.si_signo); > do_exit > exit_task_work > task_work_run > kill_me_never > memory_failure > Nice. I didn't realize that the exit code path would clear any pending task_work() requests. But it makes sense that this happens. Thanks for filling a gap in my knowledge. -Tony
