Source: linux Version: 5.10.218-1 Severity: important Tags: upstream There are two commits in 6.8 that modify (the arch independent) pfn_valid() in include/linux/mmzone.h to fix race conditions:
mm/sparsemem: fix race in accessing memory_section->usage 5ec8e8ea8b7783fab150cf86404fc38cb4db8800 (v6.8-rc1) introduces usage of rcu_read_lock()/rcu_read_unlock() (which are (transitively) GPL-only symbols) mm, kmsan: fix infinite recursion due to RCU critical section f6564fce256a3944aa1bc76cb3c40e792d97c1eb (v6.8-rc3) switches that to rcu_read_lock_sched()/rcu_read_unlock_sched() (which are not) Both commits got backported to Linux 6.1 (in bookworm) in v6.1.76/v6.1.77 but so far only the first got backported to Linux 5.10 (in bullseye) in v5.10.210. This triggered a module build failure of the proprietary nvidia driver in bullseye-pu on ppc64el (no other architectures affected), while it succeeds for the kernels in bookworm-pu and sid. (see #1072965 for details) Andreas
