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Groups > linux.debian.bugs.dist > #1202104

Bug#1074170: linux: missing 5.10 backport of pfn_valid() changes from f6564fce256a3944aa1bc76cb3c40e792d97c1eb ?

Cross-posted to 2 groups.

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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

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Bug#1074170: linux: missing 5.10 backport of pfn_valid() changes from f6564fce256a3944aa1bc76cb3c40e792d97c1eb ? Andreas Beckmann <anbe@debian.org> - 2024-06-24 11:10 +0200

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