On 2022-01-03 12:09 p.m., John David Anglin wrote:
I've seen this crash twice recently: Bad Address (null pointer deref?): Code=6 (Instruction TLB miss fault) at addr 00000000e5361d5f Kernel panic - not syncing: Bad Address (null pointer deref?)
After more thinking, I think it's likely that the pagefault_disabled counter is getting corrupted. pagefault_disable/pagefault_enable are not atomic on parisc. The corruption is probably coming from the revised LWS code. At a minimum, we need to move pagefault_disable/pagefault_enable inside spinlock. It's also not a great idea to panic on user space faults when faulthandler_disabled(). Dave -- John David Anglin dave.anglin@xxxxxxxx
