The patch titled mm_owner: fix cgroup null dereference has been added to the -mm tree. Its filename is mm-owner-fix-race-between-swap-and-exit-fix.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 *** See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm_owner: fix cgroup null dereference From: Jiri Slaby <jirislaby@xxxxxxxxx> mm->owner is set to NULL prior to calling cgroup_mm_owner_callbacks, but it should be set after that to not pass NULL pointer as the old owner which otherwise results in an oops (shortened): BUG: unable to handle kernel NULL pointer dereference at 0000000000000580 Oops: 0000 [1] SMP Pid: 3396, comm: nscd Tainted: G W 2.6.27-rc3-mm1_64 #439 RIP: 0010:[<ffffffff8027035a>] [<ffffffff8027035a>] cgroup_mm_owner_callbacks+0x3a/0x90 RAX: 0000000000000000 RBX: ffffffff80589720 RCX: ffff880079f503e8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff806c36e0 RBP: ffff880078291bd8 R08: ffff880078290000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8800787f8e20 Call Trace: [<ffffffff8023d42a>] mm_update_next_owner+0x1ca/0x240 [<ffffffff8023d5aa>] exit_mm+0x10a/0x150 [<ffffffff8023f1fc>] do_exit+0x1dc/0x940 Code: 89 fe 41 55 49 89 f5 41 54 53 74 68 48 c7 c3 20 97 58 80 45 31 e4 0f 1f 00 48 8b 3b 4d 85 ed 48 63 47 58 48 8d 14 c5 00 00 00 00 <49> 8b 86 80 05 00 00 48 8d 44 10 38 48 8b 00 48 8b 30 74 12 49 Signed-off-by: Jiri Slaby <jirislaby@xxxxxxxxx> Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> Cc: Hugh Dickins <hugh@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/exit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN kernel/exit.c~mm-owner-fix-race-between-swap-and-exit-fix kernel/exit.c --- a/kernel/exit.c~mm-owner-fix-race-between-swap-and-exit-fix +++ a/kernel/exit.c @@ -637,8 +637,8 @@ retry: * the callback and take action */ down_write(&mm->mmap_sem); - mm->owner = NULL; cgroup_mm_owner_callbacks(mm->owner, NULL); + mm->owner = NULL; up_write(&mm->mmap_sem); return; _ Patches currently in -mm which might be from jirislaby@xxxxxxxxx are ath5k-unify-resets.patch mm-owner-fix-race-between-swap-and-exit-fix.patch viafb-viafbdevc-viafbdevh.patch viafb-viafbdevc-viafbdevh-checkpatch-fixes.patch ip2-fix-iielliscleanup-as-it-is-static-but-not-always-used.patch char-merge-ip2main-and-ip2base.patch char-ip2-cleanup-globals.patch char-ip2-fix-sparse-warnings.patch char-ip2-init-deinit-cleanup.patch ip2-avoid-add_timer-with-pending-timer.patch char-ds1286-eliminate-busy-waiting.patch reiser4.patch shrink_slab-handle-bad-shrinkers.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