Bernhard Held <berny156@xxxxxx> wrote: > On 08/28/2017 at 06:56 PM, Nadav Amit wrote: >> Bernhard Held <berny156@xxxxxx> wrote: >>> On 08/27/2017 at 02:35 PM, Adam Borowski wrote: >>>> 4.13-rc5 retested fails >>>> Crashed only after two hours or so of testing. >>>> 4.13-rc4 apparently works >>>> It survived several hours of varied tests (like 5 debian-installer runs, a >>>> win10 point release upgrade, some hurd package building, openbsd, etc), >>>> all while the host was likewise busy. >>>> Thus: to the best of my knowledge, the problem is between 4.13-rc4 and 4.13-rc5 >>>> but I wouldn't bet my life on it. >>> >>> I get crashes with Win10 in kvm with 4.13-rc5. 4.13-rc4 works for me. THP seems to accelerate the crash, but that's not 100% sure. >>> >>> There's still no crash after reverting merge 27df70 on 4.13-rc7. There are 21 commits in this merge, 10 are mm-related: >>> >>> $ git log 4e082e9ba7cd..e86b298bebf7 --pretty=oneline --abbrev-commit >>> e86b298bebf7 userfaultfd: replace ENOSPC with ESRCH in case mm has gone during copy/zeropage >>> f357e345eef7 zram: rework copy of compressor name in comp_algorithm_store() >>> aac2fea94f7a rmap: do not call mmu_notifier_invalidate_page() under ptl >>> d041353dc98a mm: fix list corruptions on shmem shrinklist >>> af54aed94bf3 mm/balloon_compaction.c: don't zero ballooned pages >>> c0a6a5ae6b5d MAINTAINERS: copy virtio on balloon_compaction.c >>> b3a81d0841a9 mm: fix KSM data corruption >>> 99baac21e458 mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem >>> 0a2dd266dd6b mm: make tlb_flush_pending global >>> 56236a59556c mm: refactor TLB gathering API >>> a9b802500ebb Revert "mm: numa: defer TLB flush for THP migration as long as possible" >>> 0a2c40487f3e mm: migrate: fix barriers around tlb_flush_pending >>> 16af97dc5a89 mm: migrate: prevent racy access to tlb_flush_pending >>> 9eeb52ae712e fault-inject: fix wrong should_fail() decision in task context >>> 4e98ebe5f435 test_kmod: fix small memory leak on filesystem tests >>> 9c56771316ef test_kmod: fix the lock in register_test_dev_kmod() >>> 434b06ae23ba test_kmod: fix bug which allows negative values on two config options >>> a4afe8cdec16 test_kmod: fix spelling mistake: "EMTPY" -> "EMPTY" >>> 5af10dfd0afc userfaultfd: hugetlbfs: remove superfluous page unlock in VM_SHARED case >>> 75dddef32514 mm: ratelimit PFNs busy info message >>> d507e2ebd2c7 mm: fix global NR_SLAB_.*CLAIMABLE counter reads >> Don’t blame me for the TLB stuff... My money is on aac2fea94f7a . > > Amit, thanks for your courage to expose your patch! Just for the record, aac2fea94f7a is not mine (some others are). > > I'm more and more confident that aac2fea94f7a is the culprit. Maybe it just accelerates the triggering of the splash. To be more sure the kernel needs to be tested for a couple of days. It would be great if others could assist in testing aac2fea94f7a.
