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David Rientjes 066b3aa845 oprofile: fix race condition in event_buffer free 
Looking at the 2.6.31-rc9 code, it appears there is a race condition
in the event_buffer cleanup code path (shutdown). This could lead to
kernel panic as some CPUs may be operating on the event buffer AFTER
it has been freed. The attached patch solves the problem and makes
sure CPUs check if the buffer is not NULL before they access it as
some may have been spinning on the mutex while the buffer was being
freed.

The race may happen if the buffer is freed during pending reads. But
it is not clear why there are races in add_event_entry() since all
workqueues or handlers are canceled or flushed before the event buffer
is freed.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
2009-10-09 18:02:01 +02:00
..
accessibility
acpi Merge branch 'acpi-pad' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-10-04 15:03:00 -07:00
amba
ata trivial: fix comment typo in drivers/ata/pata_hpt37x.c 2009-09-21 15:15:53 +02:00
atm net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
auxdisplay
base mm: oom analysis: add shmem vmstat 2009-09-22 07:17:27 -07:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2009-10-04 12:39:14 -07:00
bluetooth
cdrom sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
char headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
clocksource
connector connector: Removed the destruct_data callback since it is always kfree_skb() 2009-10-02 10:54:05 -07:00
cpufreq
cpuidle cpuidle: menu governor: reduce latency on exit 2009-09-22 07:17:45 -07:00
crypto
dca
dio
dma Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx into for-linus 2009-09-23 18:31:11 +10:00
edac edac: core: remove completion-wait for complete with rcu_barrier 2009-09-24 07:21:05 -07:00
eisa
firewire headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
firmware mm: don't use alloc_bootmem_low() where not strictly needed 2009-09-22 07:17:38 -07:00
gpio const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
gpu Merge branch 'drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-09-30 08:03:00 -07:00
hid headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
hwmon ltc4215/ltc4245: Discard obsolete detect methods 2009-10-04 22:53:42 +02:00
i2c i2c: Hide probe errors caused by ACPI resource conflicts 2009-10-04 22:53:45 +02:00
ide Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-09-23 09:32:11 -07:00
idle
ieee1394 const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
ieee802154
infiniband headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
input headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
isdn headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
leds leds: leds-pca9532 - Drop unused module parameters 2009-10-04 22:53:43 +02:00
lguest const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
macintosh macintosh: Don't assume i2c device probing always succeeds 2009-10-04 22:53:46 +02:00
mca
md Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2009-10-04 12:39:14 -07:00
media headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
memstick memstick: move dev_dbg 2009-09-24 07:21:05 -07:00
message Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-09-22 07:51:45 -07:00
mfd headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
misc max6875: Discard obsolete detect method 2009-10-04 22:53:41 +02:00
mmc Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-10-02 16:20:43 -07:00
mtd block: use normal I/O path for discard requests 2009-10-01 21:19:30 +02:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-10-02 13:37:18 -07:00
nubus
of of: remove "stm,m25p40" alias 2009-09-23 07:39:43 -07:00
oprofile oprofile: fix race condition in event_buffer free 2009-10-09 18:02:01 +02:00
parisc mm: replace various uses of num_physpages by totalram_pages 2009-09-22 07:17:38 -07:00
parport sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
pci ACPICA: fixup after acpi_get_object_info() change 2009-09-25 14:24:22 -04:00
pcmcia Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-10-02 16:20:43 -07:00
platform Merge branches 'sony-laptop', 'bugzilla-14247' and 'bugzilla-14271' into release 2009-10-02 11:27:57 -04:00
pnp ACPI: remove acpi_device.flags.hardware_id 2009-09-25 15:09:48 -04:00
power Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2009-09-23 03:49:27 +04:00
pps
ps3
rapidio
regulator regulator: fix voltage range in da9034 ldo12 2009-09-22 13:58:23 +01:00
rtc Merge branch 'origin' into for-linus 2009-09-24 21:22:33 +01:00
s390 const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
sbus const: make block_device_operations const 2009-09-22 07:17:25 -07:00
scsi const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
serial Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-10-02 16:20:43 -07:00
sfi SFI: remove __init from sfi_verify_table 2009-10-03 01:16:12 -04:00
sh
sn
spi spi-imx: strip down chipselect function to only drive the chipselect 2009-10-01 16:11:17 -07:00
ssb ssb/sdio: fix printk format warnings 2009-09-23 11:35:41 -04:00
staging Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2009-10-04 14:59:14 -07:00
tc
telephony
thermal thermal: add missing Kconfig dependency 2009-09-19 01:41:49 -04:00
uio const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
usb headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
uwb const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
video Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-10-02 13:37:18 -07:00
virtio virtio: add virtio IDs file 2009-09-23 22:26:32 +09:30
vlynq drivers/vlynq/vlynq.c: fix resource size off by 1 error 2009-09-24 07:21:05 -07:00
w1 ds2482: Discard obsolete detect method 2009-10-04 22:53:41 +02:00
watchdog [WATCHDOG] Add support for the Avionic Design Xanthos watchdog timer. 2009-09-25 08:38:16 +00:00
xen headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
zorro
Kconfig
Makefile Merge git://git.infradead.org/mtd-2.6 2009-09-23 10:07:49 -07:00