Jens Axboe <ax...@kernel.dk> writes: > Powerpc sets up PF_KTHREAD and PF_IO_WORKER with a NULL pt_regs, which > from my (arguably very short) checking is not commonly done for other > archs. This is fine, except when PF_IO_WORKER's have been created and > the task does something that causes a coredump to be generated.
Do kthread's ever core dump? I didn't think they did, but I can't find any logic to prevent it. Maybe it's always been possible but just never happened due to luck. As Nick said we should probably have a non-NULL regs for PF_IO_WORKERS, but I'll still take this as a nice backportable fix for the immediate crash. I tagged it as Fixes: pointing back at the commit that added ppr_get(), even though I don't know for sure the bug was triggerable back then (v4.8). cheers
