diff options
authorPaolo 'Blaisorblade' Giarrusso <>2005-11-13 16:07:04 -0800
committerLinus Torvalds <>2005-11-13 18:14:14 -0800
commitcbc24afa82106b67df804cb434739e4382eecd9a (patch)
parent2ab23c95a0b77d45dc764dd4aed48fe6e8906e59 (diff)
[PATCH] uml: remove bogus WARN_ON, triggerable harmlessly on a page fault race
The below warning was added in place of pte_mkyoung(); if (is_write) pte_mkdirty(); In fact, if the PTE is not marked young/dirty, our dirty/accessed bit emulation would cause the TLB permission not to be changed, and so we'd loop, and given we don't support preemption yet, we'd busy-hang here. However, I've seen this warning trigger without crashes during a loop of concurrent kernel builds, at random times (i.e. like a race condition), and I realized that two concurrent faults on the same page, one on read and one on write, can trigger it. The read fault gets serviced and the PTE gets marked writable but clean (it's possible on a shared-writable mapping), while the generic code sees the PTE was already installed and returns without action. In this case, we'll see another fault and service it normally. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <> Acked-by: Jeff Dike <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c
index 95c8f8733baf..0d4c10a73607 100644
--- a/arch/um/kernel/trap_kern.c
+++ b/arch/um/kernel/trap_kern.c
@@ -95,7 +95,16 @@ survive:
pte = pte_offset_kernel(pmd, address);
} while(!pte_present(*pte));
err = 0;
+ /* The below warning was added in place of
+ * pte_mkyoung(); if (is_write) pte_mkdirty();
+ * If it's triggered, we'd see normally a hang here (a clean pte is
+ * marked read-only to emulate the dirty bit).
+ * However, the generic code can mark a PTE writable but clean on a
+ * concurrent read fault, triggering this harmlessly. So comment it out.
+ */
+#if 0
WARN_ON(!pte_young(*pte) || (is_write && !pte_dirty(*pte)));
flush_tlb_page(vma, address);