On Wed, Jul 22, 2020 at 1:55 AM Arnd Bergmann arnd@arndb.de wrote:
Adding Roman Gushchin to Cc, he touched that code recently.
Naresh, if nobody has any immediate ideas, you could double-check by reverting these commits:
e0b8d00b7561 mm: memcg/percpu: per-memcg percpu memory statistics 99411af13595 mm/percpu: fix 'defined but not used' warning 9398ce6306b6 mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix-fix 54116d471779 mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix ec518e090843 mm: memcg/percpu: account percpu memory to memory cgroups 9bc897d18dc3 percpu: return number of released bytes from pcpu_free_area()
Arnd
I think syzbot has bisected this issue to the suspect patch.
https://lore.kernel.org/lkml/00000000000043f09405ab01b0b8@google.com/