From: Nick Piggin <npiggin@suse.de>
To: Linux Memory Management <linux-mm@kvack.org>,
Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@suse.de>
Subject: [patch 1/5] mm: fault vs invalidate/truncate check
Date: Tue, 10 Oct 2006 16:21:41 +0200 (CEST) [thread overview]
Message-ID: <20061010121323.19693.99051.sendpatchset@linux.site> (raw)
In-Reply-To: <20061010121314.19693.75503.sendpatchset@linux.site>
Add a bugcheck for Andrea's pagefault vs invalidate race. This is triggerable
for both linear and nonlinear pages with a userspace test harness (using
direct IO and truncate, respectively).
Signed-off-by: Nick Piggin <npiggin@suse.de>
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -120,6 +120,8 @@ void __remove_from_page_cache(struct pag
page->mapping = NULL;
mapping->nrpages--;
__dec_zone_page_state(page, NR_FILE_PAGES);
+
+ BUG_ON(page_mapped(page));
}
void remove_from_page_cache(struct page *page)
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <npiggin@suse.de>
To: Linux Memory Management <linux-mm@kvack.org>,
Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@suse.de>
Subject: [patch 1/5] mm: fault vs invalidate/truncate check
Date: Tue, 10 Oct 2006 16:21:41 +0200 (CEST) [thread overview]
Message-ID: <20061010121323.19693.99051.sendpatchset@linux.site> (raw)
In-Reply-To: <20061010121314.19693.75503.sendpatchset@linux.site>
Add a bugcheck for Andrea's pagefault vs invalidate race. This is triggerable
for both linear and nonlinear pages with a userspace test harness (using
direct IO and truncate, respectively).
Signed-off-by: Nick Piggin <npiggin@suse.de>
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -120,6 +120,8 @@ void __remove_from_page_cache(struct pag
page->mapping = NULL;
mapping->nrpages--;
__dec_zone_page_state(page, NR_FILE_PAGES);
+
+ BUG_ON(page_mapped(page));
}
void remove_from_page_cache(struct page *page)
--
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next prev parent reply other threads:[~2006-10-10 14:21 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-10 14:21 [rfc] 2.6.19-rc1-git5: consolidation of file backed fault handlers Nick Piggin
2006-10-10 14:21 ` Nick Piggin
2006-10-10 14:21 ` Nick Piggin [this message]
2006-10-10 14:21 ` [patch 1/5] mm: fault vs invalidate/truncate check Nick Piggin
2006-10-10 14:21 ` [patch 2/5] mm: fault vs invalidate/truncate race fix Nick Piggin
2006-10-10 14:21 ` Nick Piggin
2006-10-11 4:38 ` Andrew Morton
2006-10-11 4:38 ` Andrew Morton
2006-10-11 5:39 ` Nick Piggin
2006-10-11 5:39 ` Nick Piggin
2006-10-11 6:00 ` Andrew Morton
2006-10-11 6:00 ` Andrew Morton
2006-10-11 9:21 ` Nick Piggin
2006-10-11 9:21 ` Nick Piggin
2006-10-11 16:21 ` Linus Torvalds
2006-10-11 16:21 ` Linus Torvalds
2006-10-11 16:57 ` SPAM: " Nick Piggin
2006-10-11 16:57 ` Nick Piggin
2006-10-11 17:11 ` Linus Torvalds
2006-10-11 17:11 ` Linus Torvalds
2006-10-11 17:21 ` SPAM: " Nick Piggin
2006-10-11 17:21 ` Nick Piggin
2006-10-11 17:38 ` Linus Torvalds
2006-10-11 17:38 ` Linus Torvalds
2006-10-12 3:33 ` Nick Piggin
2006-10-12 3:33 ` Nick Piggin
2006-10-12 15:37 ` Linus Torvalds
2006-10-12 15:37 ` Linus Torvalds
2006-10-12 15:40 ` Nick Piggin
2006-10-12 15:40 ` Nick Piggin
2006-10-11 5:13 ` Andrew Morton
2006-10-11 5:13 ` Andrew Morton
2006-10-11 5:50 ` Nick Piggin
2006-10-11 5:50 ` Nick Piggin
2006-10-11 6:10 ` Andrew Morton
2006-10-11 6:10 ` Andrew Morton
2006-10-11 6:17 ` [patch 1/6] revert "generic_file_buffered_write(): handle zero length iovec segments" Andrew Morton
2006-10-11 6:17 ` Andrew Morton, Andrew Morton
[not found] ` <20061010231150.fb9e30f5.akpm@osdl.org>
2006-10-11 6:17 ` [patch 2/6] revert "generic_file_buffered_write(): deadlock on vectored write" Andrew Morton
2006-10-11 6:17 ` Andrew Morton, Andrew Morton
[not found] ` <20061010231243.bc8b834c.akpm@osdl.org>
2006-10-11 6:17 ` [patch 3/6] generic_file_buffered_write() cleanup Andrew Morton
2006-10-11 6:17 ` Andrew Morton, Andrew Morton
[not found] ` <20061010231339.a79c1fae.akpm@osdl.org>
2006-10-11 6:18 ` [patch 4/6] generic_file_buffered_write(): fix page prefaulting Andrew Morton
2006-10-11 6:18 ` Andrew Morton, Andrew Morton
[not found] ` <20061010231424.db88931f.akpm@osdl.org>
2006-10-11 6:18 ` [patch 5/6] generic_file_buffered_write(): max_len cleanup Andrew Morton
2006-10-11 6:18 ` Andrew Morton, Andrew Morton
[not found] ` <20061010231514.c1da7355.akpm@osdl.org>
2006-10-11 6:18 ` [patch 6/6] fix pagecache write deadlocks Andrew Morton
2006-10-11 6:18 ` Andrew Morton, Andrew Morton
2006-10-21 1:53 ` [patch 2/5] mm: fault vs invalidate/truncate race fix Benjamin Herrenschmidt
2006-10-21 1:53 ` Benjamin Herrenschmidt
2006-10-10 14:22 ` [patch 3/5] mm: fault handler to replace nopage and populate Nick Piggin
2006-10-10 14:22 ` Nick Piggin
2006-10-10 14:22 ` [patch 4/5] mm: add vm_insert_pfn helpler Nick Piggin
2006-10-10 14:22 ` Nick Piggin
2006-10-11 10:12 ` Thomas Hellstrom
2006-10-11 11:24 ` Nick Piggin
2006-10-11 21:30 ` Thomas Hellström
2006-10-10 14:22 ` [patch 5/5] mm: merge nopfn with fault handler Nick Piggin
2006-10-10 14:22 ` Nick Piggin
2006-10-10 14:26 ` [rfc] 2.6.19-rc1-git5: consolidation of file backed fault handlers Nick Piggin
2006-10-10 14:26 ` Nick Piggin
2006-10-10 14:33 ` Christoph Hellwig
2006-10-10 14:33 ` Christoph Hellwig
2006-10-10 15:01 ` Nick Piggin
2006-10-10 15:01 ` Nick Piggin
2006-10-10 16:09 ` Arjan van de Ven
2006-10-10 16:09 ` Arjan van de Ven
2006-10-11 0:46 ` SPAM: " Nick Piggin
2006-10-11 0:46 ` Nick Piggin
2006-10-10 15:07 ` Arjan van de Ven
2006-10-10 15:07 ` Arjan van de Ven
-- strict thread matches above, loose matches on Subject: below --
2006-10-09 16:12 Nick Piggin
2006-10-09 16:12 ` [patch 1/5] mm: fault vs invalidate/truncate check Nick Piggin
2006-10-09 16:12 ` Nick Piggin
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