Dan Williams 5fd3a17ed4 md: fix deadlock when stopping arrays ... Resolve a deadlock when stopping redundant arrays, i.e. ones that require a call to sysfs_remove_group when shutdown. The deadlock is summarized below: Thread1 Thread2 ------- ------- read sysfs attribute stop array take mddev lock sysfs_remove_group sysfs_get_active wait for mddev lock wait for active Sysrq-w: -------- mdmon S 00000017 2212 4163 1 f1982ea8 00000046 2dcf6b85 00000017 c0b23100 f2f83ed0 c0b23100 f2f8413c c0b23100 c0b23100 c0b1fb98 f2f8413c 00000000 f2f8413c c0b23100 f2291ecc 00000002 c0b23100 00000000 00000017 f2f83ed0 f1982eac 00000046 c044d9dd Call Trace: [<c044d9dd>] ? debug_mutex_add_waiter+0x1d/0x58 [<c06ef451>] __mutex_lock_common+0x1d9/0x338 [<c06ef451>] ? __mutex_lock_common+0x1d9/0x338 [<c06ef5e3>] mutex_lock_interruptible_nested+0x33/0x3a [<c0634553>] ? mddev_lock+0x14/0x16 [<c0634553>] mddev_lock+0x14/0x16 [<c0634eda>] md_attr_show+0x2a/0x49 [<c04e9997>] sysfs_read_file+0x93/0xf9 mdadm D 00000017 2812 4177 1 f0401d78 00000046 430456f8 00000017 f0401d58 f0401d20 c0b23100 f2da2c4c c0b23100 c0b23100 c0b1fb98 f2da2c4c 0a10fc36 00000000 c0b23100 f0401d70 00000003 c0b23100 00000000 00000017 f2da29e0 00000001 00000002 00000000 Call Trace: [<c06eed1b>] schedule_timeout+0x1b/0x95 [<c06eed1b>] ? schedule_timeout+0x1b/0x95 [<c06eeb97>] ? wait_for_common+0x34/0xdc [<c044fa8a>] ? trace_hardirqs_on_caller+0x18/0x145 [<c044fbc2>] ? trace_hardirqs_on+0xb/0xd [<c06eec03>] wait_for_common+0xa0/0xdc [<c0428c7c>] ? default_wake_function+0x0/0x12 [<c06eeccc>] wait_for_completion+0x17/0x19 [<c04ea620>] sysfs_addrm_finish+0x19f/0x1d1 [<c04e920e>] sysfs_hash_and_remove+0x42/0x55 [<c04eb4db>] sysfs_remove_group+0x57/0x86 [<c0638086>] do_md_stop+0x13a/0x499 This has been there for a while, but is easier to trigger now that mdmon is closely watching sysfs. Cc: <stable@kernel.org> Reported-by: Jacek Danecki <jacek.danecki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2009-03-04 00:57:25 -07:00
..
accessibility
acpi	Merge branches 'release', 'bugzilla-12011', 'bugzilla-12632', 'misc' and 'suspend' into release	2009-02-21 22:01:43 -05:00
amba
ata	[libata] pata_legacy: for VLB 32bit PIO don't try tricks with slop	2009-02-25 15:30:23 -05:00
atm	ATM: misplaced parentheses?	2009-02-18 17:41:38 -08:00
auxdisplay
base	PM: Split up sysdev_[suspend|resume] from device_power_[down|up], fix	2009-02-22 22:09:33 +01:00
block	xen/blkfront: use blk_rq_map_sg to generate ring entries	2009-02-26 10:45:48 +01:00
bluetooth
cdrom
char	m68k: atari - Rename "mfp" to "st_mfp"	2009-02-22 09:23:02 -08:00
clocksource
connector
cpufreq
cpuidle
crypto	crypto: ixp4xx - Fix qmgr_request_queue build failure	2009-03-04 08:01:22 +08:00
dca
dio
dma	[ARM] fix lots of ARM __devexit sillyness	2009-03-03 21:04:04 +00:00
edac
eisa
firewire
firmware	Bernhard has moved	2009-02-18 15:37:56 -08:00
gpio
gpu	drm/i915: Fix use-before-null-check in i915_irq_emit().	2009-03-03 09:53:05 +10:00
hid	HID: move tmff and zpff devices from ignore_list to blacklist	2009-02-17 13:25:01 +01:00
hwmon	lis3lv02d: add axes knowledge of HP Pavilion dv5 models	2009-02-18 15:37:54 -08:00
i2c	Merge master.kernel.org:/home/rmk/linux-2.6-arm	2009-03-03 14:12:41 -08:00
ide	ide: fix refcounting in device drivers	2009-02-25 20:28:24 +01:00
idle
ieee1394	Make ieee1394_init a fs-initcall	2009-02-26 10:32:31 -08:00
infiniband
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2009-03-02 15:43:03 -08:00
isdn	ISDN: fix sc/shmem printk format warning	2009-02-20 00:54:44 -08:00
leds
lguest
macintosh
mca
md	md: fix deadlock when stopping arrays	2009-03-04 00:57:25 -07:00
media	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2009-03-02 15:43:03 -08:00
memstick
message	[SCSI] mpt: fix disable lsi sas to use msi as default	2009-02-22 08:51:07 -06:00
mfd	mfd: Fix sm501_register_gpio section mismatch	2009-02-17 09:48:05 +01:00
misc	hpilo: new pci device	2009-02-27 16:26:22 -08:00
mmc	sdhci: Add NO_BUSY_IRQ quirk for Marvell CAFE host chip	2009-03-02 21:48:20 +01:00
mtd	Merge master.kernel.org:/home/rmk/linux-2.6-arm	2009-03-03 14:12:41 -08:00
net	Merge master.kernel.org:/home/rmk/linux-2.6-arm	2009-03-03 14:12:41 -08:00
nubus
of
oprofile
parisc
parport	m68k: atari - Rename "mfp" to "st_mfp"	2009-02-22 09:23:02 -08:00
pci	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2009-02-26 14:43:42 -08:00
pcmcia
platform	fujitsu-laptop: Use RFKILL support bitmask from firmware	2009-02-21 21:59:55 -05:00
pnp
power
ps3
rapidio
regulator
rtc
s390	[S390] fix "mem=" handling in case of standby memory	2009-02-19 15:19:19 +01:00
sbus
scsi	[SCSI] fix ABORTED_COMMAND looping forever problem	2009-02-21 20:29:38 -06:00
serial	Merge branch 'sh/for-2.6.29' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6	2009-02-27 16:40:00 -08:00
sh
sn
spi	spi-gpio: sanitize MISO bitvalue	2009-02-18 15:37:56 -08:00
ssb
staging	Staging: w35und: fix usb_control_msg() error handling in wb35_probe()	2009-02-27 12:56:24 -08:00
tc
telephony
thermal
uio
usb	USB: musb: fix srp sysfs entry deletion	2009-02-27 14:40:51 -08:00
uwb
video	Merge master.kernel.org:/home/rmk/linux-2.6-arm	2009-03-03 14:12:41 -08:00
virtio
w1	w1: add missing Kconfig/Makefile entries for DS2431 slave driver	2009-02-27 16:26:21 -08:00
watchdog	Merge master.kernel.org:/home/rmk/linux-2.6-arm	2009-02-19 09:52:12 -08:00
xen	PM: Split up sysdev_[suspend|resume] from device_power_[down|up]	2009-02-22 10:33:44 -08:00
zorro
Kconfig
Makefile