On Wed, 2 Jul 2014, Hugh Dickins wrote: > On Wed, 2 Jul 2014, Johannes Weiner wrote: > > > > Could you give the following patch a spin? I put it in the mmots > > stack on top of mm-memcontrol-rewrite-charge-api-fix-shmem_unuse-fix. > > I'm just with the laptop until this evening. I slapped it on top of > my 3.16-rc2-mm1 plus fixes (but obviously minus my memcg_batch one > - which incidentally continues to run without crashing on the G5), > and it quickly gave me this lockdep splat, which doesn't look very > different from the one before. > > I see there's now an -rc3-mm1, I'll try it out on that in half an > hour... but unless I send word otherwise, assume that's the same. Yes, I get that lockdep report each time on -rc3-mm1 + your patch. I also twice got a flurry of res_counter.c:28 underflow warnings. Hmm, 62 of them each time (I was checking for a number near 512, which would suggest a THP/4k confusion, but no). The majority of them coming from mem_cgroup_reparent_charges. But the laptop stayed up fine (for two hours before I had to stop it), and the G5 has run fine with that load for 16 hours now, no problems with release_pages, and not even a res_counter.c:28 (but I don't use lockdep on it). The x86 workstation ran fine for 4.5 hours, then hit some deadlock which I doubt had any connection to your changes: looked more like a jbd2 transaction was failing to complete (which, with me trying ext4 on loop on tmpfs, might be more my problem than anyone else's). Oh, but nearly forgot, I did an earlier run on the laptop last night, which crashed within minutes on VM_BUG_ON_PAGE(!(pc->flags & PCG_MEM)) mm/memcontrol.c:6680! page had count 1 mapcount 0 mapping anon index 0x196 flags locked uptodate reclaim swapbacked, pcflags 1, memcg not root mem_cgroup_migrate < move_to_new_page < migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages < __alloc_pages_direct_compact < __alloc_pages_nodemask < alloc_pages_vma < do_huge_pmd_anonymous_page < handle_mm_fault < __do_page_fault I was expecting to reproduce that quite easily on the laptop or workstation, and investigate more closely then; but in fact have not seen it since. Hugh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>