Shaohua Li d02a2c077f cfq-iosched: fix an oops caused by slab leak ... I got below oops when unloading cfq-iosched. Considering scenario: queue A merge to B, C merge to D and B will be merged to D. Before B is merged to D, we do split B. We should put B's reference for D. [ 807.768536] ============================================================================= [ 807.768539] BUG cfq_queue: Objects remaining on kmem_cache_close() [ 807.768541] ----------------------------------------------------------------------------- [ 807.768543] [ 807.768546] INFO: Slab 0xffffea0003e6b4e0 objects=26 used=1 fp=0xffff88011d584fd8 flags=0x200000000004082 [ 807.768550] Pid: 5946, comm: rmmod Tainted: G W 2.6.34-07097-gf4b87de-dirty #724 [ 807.768552] Call Trace: [ 807.768560] [<ffffffff81104e8d>] slab_err+0x8f/0x9d [ 807.768564] [<ffffffff811059e1>] ? flush_cpu_slab+0x0/0x93 [ 807.768569] [<ffffffff8164be52>] ? add_preempt_count+0xe/0xca [ 807.768572] [<ffffffff8164bd9c>] ? sub_preempt_count+0xe/0xb6 [ 807.768577] [<ffffffff81648871>] ? _raw_spin_unlock+0x15/0x30 [ 807.768580] [<ffffffff8164bd9c>] ? sub_preempt_count+0xe/0xb6 [ 807.768584] [<ffffffff811061bc>] list_slab_objects+0x9b/0x19f [ 807.768588] [<ffffffff8164bf0a>] ? add_preempt_count+0xc6/0xca [ 807.768591] [<ffffffff81109e27>] kmem_cache_destroy+0x13f/0x21d [ 807.768597] [<ffffffffa000ff13>] cfq_slab_kill+0x1a/0x43 [cfq_iosched] [ 807.768601] [<ffffffffa000ffcf>] cfq_exit+0x93/0x9e [cfq_iosched] [ 807.768606] [<ffffffff810973a2>] sys_delete_module+0x1b1/0x219 [ 807.768612] [<ffffffff8102fb5b>] system_call_fastpath+0x16/0x1b [ 807.768618] INFO: Object 0xffff88011d584618 @offset=1560 [ 807.768622] INFO: Allocated in cfq_get_queue+0x11e/0x274 [cfq_iosched] age=7173 cpu=1 pid=5496 [ 807.768626] ============================================================================= Cc: stable@kernel.org Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2010-05-25 10:17:26 +02:00
..
Kconfig	blk-cgroup: config options re-arrangement	2010-04-26 19:27:56 +02:00
Kconfig.iosched	blk-cgroup: config options re-arrangement	2010-04-26 19:27:56 +02:00
Makefile	blkdev: move blkdev_issue helper functions to separate file	2010-04-28 19:47:36 +02:00
blk-barrier.c	blkdev: move blkdev_issue helper functions to separate file	2010-04-28 19:47:36 +02:00
blk-cgroup.c	Merge branch 'master' into for-2.6.35	2010-05-21 21:27:26 +02:00
blk-cgroup.h	blk-cgroup: config options re-arrangement	2010-04-26 19:27:56 +02:00
blk-core.c	block: allow initialization of previously allocated request_queue	2010-05-11 08:57:42 +02:00
blk-exec.c	block: don't set REQ_NOMERGE unnecessarily	2009-04-28 07:37:33 +02:00
blk-integrity.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
blk-ioc.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
blk-iopoll.c	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
blk-lib.c	block: fix bad use of min() on different types	2010-04-29 09:28:21 +02:00
blk-map.c	block: Use accessor functions for queue limits	2009-05-22 23:22:54 +02:00
blk-merge.c	block: Consolidate phys_segment and hw_segment limits	2010-02-26 13:58:08 +01:00
blk-settings.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block	2010-04-09 11:50:29 -07:00
blk-softirq.c	generic-ipi: remove CSD_FLAG_WAIT	2009-02-25 14:13:44 +01:00
blk-sysfs.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block	2010-04-09 11:50:29 -07:00
blk-tag.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
blk-timeout.c	block: ensure jiffies wrap is handled correctly in blk_rq_timed_out_timer	2010-04-21 17:42:08 +02:00
blk.h	block: implement mixed merge of different failfast requests	2009-09-11 14:33:30 +02:00
bsg.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
cfq-iosched.c	cfq-iosched: fix an oops caused by slab leak	2010-05-25 10:17:26 +02:00
compat_ioctl.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
deadline-iosched.c	block: convert to pos and nr_sectors accessors	2009-05-11 09:50:54 +02:00
elevator.c	block: Adjust elv_iosched_show to return "none" for bio-based DM	2010-05-24 09:07:32 +02:00
genhd.c	block: remove all rcu head initializations	2010-05-21 20:01:02 +02:00
ioctl.c	blkdev: generalize flags for blkdev_issue_fn functions	2010-04-28 19:47:36 +02:00
noop-iosched.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
scsi_ioctl.c	block/scsi_ioctl.c: quiet sparse noise	2009-11-04 09:10:33 +01:00