The patch titled Subject: mm, thp: print useful information when mmap_sem is unlocked in zap_pmd_range has been added to the -mm tree. Its filename is mm-thp-print-useful-information-when-mmap_sem-is-unlocked-in-zap_pmd_range.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: David Rientjes <rientjes@xxxxxxxxxx> Subject: mm, thp: print useful information when mmap_sem is unlocked in zap_pmd_range Andrea asked for addr, end, vma->vm_start, and vma->vm_end to be emitted when !rwsem_is_locked(&tlb->mm->mmap_sem). Otherwise, debugging the underlying issue is more difficult. Suggested-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memory.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff -puN mm/memory.c~mm-thp-print-useful-information-when-mmap_sem-is-unlocked-in-zap_pmd_range mm/memory.c --- a/mm/memory.c~mm-thp-print-useful-information-when-mmap_sem-is-unlocked-in-zap_pmd_range +++ a/mm/memory.c @@ -1227,7 +1227,15 @@ static inline unsigned long zap_pmd_rang next = pmd_addr_end(addr, end); if (pmd_trans_huge(*pmd)) { if (next - addr != HPAGE_PMD_SIZE) { - VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem)); +#ifdef CONFIG_DEBUG_VM + if (!rwsem_is_locked(&tlb->mm->mmap_sem)) { + pr_err("%s: mmap_sem is unlocked! addr=0x%lx end=0x%lx vma->vm_start=0x%lx vma->vm_end=0x%lx\n", + __func__, addr, end, + vma->vm_start, + vma->vm_end); + BUG(); + } +#endif split_huge_page_pmd(vma->vm_mm, pmd); } else if (zap_huge_pmd(tlb, vma, pmd, addr)) goto next; _ Subject: Subject: mm, thp: print useful information when mmap_sem is unlocked in zap_pmd_range Patches currently in -mm which might be from rientjes@xxxxxxxxxx are linux-next.patch mm-oom-fix-and-cleanup-oom-score-calculations.patch mm-thp-print-useful-information-when-mmap_sem-is-unlocked-in-zap_pmd_range.patch slab-move-full-state-transition-to-an-initcall.patch mm-buddy-cleanup-on-should_fail_alloc_page.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html