From: Hugh Dickins <hughd@google.com> To: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Witold Baryluk <baryluk@smp.if.uj.edu.pl>, Nitin Gupta <ngupta@vflare.org>, Konstantin Khlebnikov <khlebnikov@openvz.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH] tmpfs: fix highmem swapoff crash regression Date: Fri, 20 May 2011 15:47:33 -0700 (PDT) [thread overview] Message-ID: <alpine.LSU.2.00.1105201535530.1899@sister.anvils> (raw) Commit 778dd893ae78 "tmpfs: fix race between umount and swapoff" forgot the new rules for strict atomic kmap nesting, causing WARNING: at arch/x86/mm/highmem_32.c:81 from __kunmap_atomic(), then BUG: unable to handle kernel paging request at fffb9000 from shmem_swp_set() when shmem_unuse_inode() is handling swapoff with highmem in use. My disgrace again. See https://bugzilla.kernel.org/show_bug.cgi?id=35352 Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl> Signed-off-by: Hugh Dickins <hughd@google.com> Cc: stable@kernel.org --- mm/shmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- 2.6.39/mm/shmem.c 2011-05-18 21:06:34.000000000 -0700 +++ linux/mm/shmem.c 2011-05-20 13:57:20.778870967 -0700 @@ -916,11 +916,12 @@ static int shmem_unuse_inode(struct shme if (size > ENTRIES_PER_PAGE) size = ENTRIES_PER_PAGE; offset = shmem_find_swp(entry, ptr, ptr+size); + shmem_swp_unmap(ptr); if (offset >= 0) { shmem_dir_unmap(dir); + ptr = shmem_swp_map(subdir); goto found; } - shmem_swp_unmap(ptr); } } lost1:
WARNING: multiple messages have this Message-ID (diff)
From: Hugh Dickins <hughd@google.com> To: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Witold Baryluk <baryluk@smp.if.uj.edu.pl>, Nitin Gupta <ngupta@vflare.org>, Konstantin Khlebnikov <khlebnikov@openvz.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH] tmpfs: fix highmem swapoff crash regression Date: Fri, 20 May 2011 15:47:33 -0700 (PDT) [thread overview] Message-ID: <alpine.LSU.2.00.1105201535530.1899@sister.anvils> (raw) Commit 778dd893ae78 "tmpfs: fix race between umount and swapoff" forgot the new rules for strict atomic kmap nesting, causing WARNING: at arch/x86/mm/highmem_32.c:81 from __kunmap_atomic(), then BUG: unable to handle kernel paging request at fffb9000 from shmem_swp_set() when shmem_unuse_inode() is handling swapoff with highmem in use. My disgrace again. See https://bugzilla.kernel.org/show_bug.cgi?id=35352 Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl> Signed-off-by: Hugh Dickins <hughd@google.com> Cc: stable@kernel.org --- mm/shmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- 2.6.39/mm/shmem.c 2011-05-18 21:06:34.000000000 -0700 +++ linux/mm/shmem.c 2011-05-20 13:57:20.778870967 -0700 @@ -916,11 +916,12 @@ static int shmem_unuse_inode(struct shme if (size > ENTRIES_PER_PAGE) size = ENTRIES_PER_PAGE; offset = shmem_find_swp(entry, ptr, ptr+size); + shmem_swp_unmap(ptr); if (offset >= 0) { shmem_dir_unmap(dir); + ptr = shmem_swp_map(subdir); goto found; } - shmem_swp_unmap(ptr); } } lost1: -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2011-05-20 22:47 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-05-20 22:47 Hugh Dickins [this message] 2011-05-20 22:47 ` [PATCH] tmpfs: fix highmem swapoff crash regression Hugh Dickins
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