From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: stable-review@kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk,
Marcin Slusarz <marcin.slusarz@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Tejun Heo <tj@kernel.org>, Dipankar Sarma <dipankar@in.ibm.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: [13/35] debugobjects: Fix boot crash when kmemleak and debugobjects enabled
Date: Fri, 08 Jul 2011 16:00:29 -0700 [thread overview]
Message-ID: <20110708230110.847411874@clark.kroah.org> (raw)
In-Reply-To: <20110708230122.GA18807@kroah.com>
2.6.33-longterm review patch. If anyone has any objections, please let us know.
------------------
From: Marcin Slusarz <marcin.slusarz@gmail.com>
commit 161b6ae0e067e421b20bb35caf66bdb405c929ac upstream.
Order of initialization look like this:
...
debugobjects
kmemleak
...(lots of other subsystems)...
workqueues (through early initcall)
...
debugobjects use schedule_work for batch freeing of its data and kmemleak
heavily use debugobjects, so when it comes to freeing and workqueues were
not initialized yet, kernel crashes:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff810854d1>] __queue_work+0x29/0x41a
[<ffffffff81085910>] queue_work_on+0x16/0x1d
[<ffffffff81085abc>] queue_work+0x29/0x55
[<ffffffff81085afb>] schedule_work+0x13/0x15
[<ffffffff81242de1>] free_object+0x90/0x95
[<ffffffff81242f6d>] debug_check_no_obj_freed+0x187/0x1d3
[<ffffffff814b6504>] ? _raw_spin_unlock_irqrestore+0x30/0x4d
[<ffffffff8110bd14>] ? free_object_rcu+0x68/0x6d
[<ffffffff8110890c>] kmem_cache_free+0x64/0x12c
[<ffffffff8110bd14>] free_object_rcu+0x68/0x6d
[<ffffffff810b58bc>] __rcu_process_callbacks+0x1b6/0x2d9
...
because system_wq is NULL.
Fix it by checking if workqueues susbystem was initialized before using.
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20110528112342.GA3068@joi.lan
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
lib/debugobjects.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -196,7 +196,7 @@ static void free_object(struct debug_obj
* initialized:
*/
if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache)
- sched = !work_pending(&debug_obj_work);
+ sched = keventd_up() && !work_pending(&debug_obj_work);
hlist_add_head(&obj->node, &obj_pool);
obj_pool_free++;
obj_pool_used--;
next prev parent reply other threads:[~2011-07-09 6:08 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-08 23:01 [00/35] 2.6.33.16-longterm review Greg KH
2011-07-08 23:00 ` [01/35] ksm: fix NULL pointer dereference in scan_get_next_rmap_item() Greg KH
2011-07-08 23:00 ` [02/35] migrate: dont account swapcache as shmem Greg KH
2011-07-08 23:00 ` [03/35] xen: partially revert "xen: set max_pfn_mapped to the last pfn mapped" Greg KH
2011-07-08 23:00 ` [04/35] clocksource: Make watchdog robust vs. interruption Greg KH
2011-07-08 23:00 ` [05/35] TTY: ldisc, do not close until there are readers Greg KH
2011-07-08 23:00 ` [06/35] xhci: Reject double add of active endpoints Greg KH
2011-07-08 23:00 ` [07/35] PM: Free memory bitmaps if opening /dev/snapshot fails Greg KH
2011-07-08 23:00 ` [08/35] ath5k: fix memory leak when fewer than N_PD_CURVES are in use Greg KH
2011-07-08 23:00 ` [09/35] ath9k: Fix suspend/resume when no interface is UP Greg KH
2011-07-08 23:00 ` [10/35] mm: fix negative commitlimit when gigantic hugepages are allocated Greg KH
2011-07-08 23:00 ` [11/35] [media] uvcvideo: Remove buffers from the queues when freeing Greg KH
2011-07-08 23:00 ` [12/35] watchdog: mtx1-wdt: request gpio before using it Greg KH
2011-07-08 23:00 ` Greg KH [this message]
2011-07-08 23:00 ` [14/35] cfq-iosched: fix locking around ioc->ioc_data assignment Greg KH
2011-07-08 23:00 ` [15/35] cfq-iosched: fix a rcu warning Greg KH
2011-07-08 23:00 ` [16/35] i2c-taos-evm: Fix log messages Greg KH
2011-07-08 23:00 ` [17/35] md: avoid endless recovery loop when waiting for fail device to complete Greg KH
2011-07-08 23:00 ` [18/35] SUNRPC: Ensure the RPC client only quits on fatal signals Greg KH
2011-07-08 23:00 ` [19/35] 6pack,mkiss: fix lock inconsistency Greg KH
2011-07-08 23:00 ` [20/35] taskstats: dont allow duplicate entries in listener mode Greg KH
2011-07-08 23:00 ` [21/35] USB: dont let errors prevent system sleep Greg KH
2011-07-08 23:00 ` [22/35] USB: dont let the hub driver " Greg KH
2011-07-08 23:00 ` [23/35] uml: fix CONFIG_STATIC_LINK=y build failure with newer glibc Greg KH
2011-07-08 23:00 ` [24/35] um: os-linux/mem.c needs sys/stat.h Greg KH
2011-07-08 23:00 ` [25/35] netlink: Make nlmsg_find_attr take a const nlmsghdr* Greg KH
2011-07-08 23:00 ` [26/35] inet_diag: fix inet_diag_bc_audit() Greg KH
2011-07-08 23:00 ` [27/35] PM / Hibernate: Avoid hitting OOM during preallocation of memory Greg KH
2011-07-08 23:00 ` [28/35] PM / Hibernate: Fix free_unnecessary_pages() Greg KH
2011-07-08 23:00 ` [29/35] bug.h: Add WARN_RATELIMIT Greg KH
2011-07-08 23:00 ` [30/35] net: filter: Use WARN_RATELIMIT Greg KH
2011-07-08 23:00 ` [31/35] af_packet: prevent information leak Greg KH
2011-07-08 23:00 ` [32/35] net/ipv4: Check for mistakenly passed in non-IPv4 address Greg KH
2011-07-08 23:00 ` [33/35] ipv6/udp: Use the correct variable to determine non-blocking condition Greg KH
2011-07-08 23:00 ` [34/35] udp/recvmsg: Clear MSG_TRUNC flag when starting over for a new packet Greg KH
2011-07-08 23:00 ` [35/35] mm: prevent concurrent unmap_mapping_range() on the same inode Greg KH
-- strict thread matches above, loose matches on Subject: below --
2011-07-08 22:53 [00/35] 2.6.32.43-longterm review Greg KH
2011-07-08 22:50 ` [13/35] debugobjects: Fix boot crash when kmemleak and debugobjects enabled Greg KH
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