On Mon, 14 Jun 2021 21:22:43 +0800 Dongliang Mu <mudongliangabcd@xxxxxxxxx> wrote: > Dear kernel developers, > > I was trying to debug the crash - memory leak in hwsim_add_one [1] > recently. However, I encountered a disgusting issue: my breakpoint and > printk/pr_alert in the functions that will be surely executed do not > work. The stack trace is in the following. I wrote this email to ask > for some suggestions on how to debug such cases? > > Thanks very much. Looking forward to your reply. > Hi, Dongliang! This bug is not similar to others on the dashboard. I spent some time debugging it a week ago. The main problem here, that memory allocation happens in the boot time: > [<ffffffff84359255>] kernel_init+0xc/0x1a7 init/main.c:1447 and reproducer simply tries to free this data. You can use ftrace to look at it. Smth like this: $ echo 'hwsim_*' > $TRACE_DIR/set_ftrace_filter would work. With regards, Pavel Skripkin
