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linux/drivers
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Jibin Xu 1c4d760039 sysrq : fix Show Regs call trace on ARM 
[ Upstream commit b00bebbc30 ]

When kernel configuration SMP,PREEMPT and DEBUG_PREEMPT are enabled,
echo 1 >/proc/sys/kernel/sysrq
echo p >/proc/sysrq-trigger
kernel will print call trace as below:

sysrq: SysRq : Show Regs
BUG: using __this_cpu_read() in preemptible [00000000] code: sh/435
caller is __this_cpu_preempt_check+0x18/0x20
Call trace:
[<ffffff8008088e80>] dump_backtrace+0x0/0x1d0
[<ffffff8008089074>] show_stack+0x24/0x30
[<ffffff8008447970>] dump_stack+0x90/0xb0
[<ffffff8008463950>] check_preemption_disabled+0x100/0x108
[<ffffff8008463998>] __this_cpu_preempt_check+0x18/0x20
[<ffffff80084c9194>] sysrq_handle_showregs+0x1c/0x40
[<ffffff80084c9c7c>] __handle_sysrq+0x12c/0x1a0
[<ffffff80084ca140>] write_sysrq_trigger+0x60/0x70
[<ffffff8008251e00>] proc_reg_write+0x90/0xd0
[<ffffff80081f1788>] __vfs_write+0x48/0x90
[<ffffff80081f241c>] vfs_write+0xa4/0x190
[<ffffff80081f3354>] SyS_write+0x54/0xb0
[<ffffff80080833f0>] el0_svc_naked+0x24/0x28

This can be seen on a common board like an r-pi3.
This happens because when echo p >/proc/sysrq-trigger,
get_irq_regs() is called outside of IRQ context,
if preemption is enabled in this situation,kernel will
print the call trace. Since many prior discussions on
the mailing lists have made it clear that get_irq_regs
either just returns NULL or stale data when used outside
of IRQ context,we simply avoid calling it outside of
IRQ context.

Signed-off-by: Jibin Xu <jibin.xu@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-09 18:42:40 +01:00
..
accessibility
acpi ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal 2017-08-30 10:19:29 +02:00
amba
android ANDROID: binder: fix proc->tsk check. 2017-08-30 10:19:26 +02:00
ata ata: fixes kernel crash while tracing ata_eh_link_autopsy event 2017-11-30 08:37:21 +00:00
atm
auxdisplay
base PM / OPP: Add missing of_node_put(np) 2017-11-30 08:37:25 +00:00
bcma bcma: use (get|put)_device when probing/removing device driver 2017-03-12 06:37:30 +01:00
block xen-blkback: don't leak stack data via response ring 2017-11-21 09:21:17 +01:00
bluetooth Bluetooth: btusb: fix QCA Rome suspend/resume 2017-11-21 09:21:18 +01:00
bus bus: mbus: fix window size calculation for 4GB windows 2017-10-27 10:23:17 +02:00
cdrom
char ipmi: fix unsigned long underflow 2017-11-24 08:32:25 +01:00
clk clk: ti: dra7-atl-clock: fix child-node lookups 2017-11-30 08:37:23 +00:00
clocksource clockevents/drivers/cs5535: Improve resilience to spurious interrupts 2017-10-27 10:23:17 +02:00
connector
cpufreq cpufreq: CPPC: add ACPI_PROCESSOR dependency 2017-10-21 17:09:06 +02:00
cpuidle ARM: cpuidle: Fix error return code 2016-10-16 17:36:15 +02:00
crypto crypto: vmx - disable preemption to enable vsx in aes_ctr.c 2017-11-15 17:13:10 +01:00
dca
devfreq
dio
dma dmaengine: zx: set DMA_CYCLIC cap_mask bit 2017-11-30 08:37:26 +00:00
dma-buf
edac EDAC, sb_edac: Fix missing break in switch 2017-12-09 18:42:40 +01:00
eisa
extcon extcon: palmas: Check the parent instance to prevent the NULL 2017-11-21 09:21:18 +01:00
firewire firewire: net: fix fragmented datagram_size off-by-one 2016-11-10 16:36:35 +01:00
firmware x86/efi-bgrt: Fix kernel panic when mapping BGRT data 2017-12-05 11:22:50 +01:00
fmc
fpga
gpio gpio: mpc8xxx: Correct irq handler function 2016-10-28 03:01:25 -04:00
gpu drm/i915: Prevent zero length "index" write 2017-12-05 11:22:52 +01:00
hid HID: usbhid: fix out-of-bounds bug 2017-10-18 09:20:41 +02:00
hsi
hv Drivers: hv: fcopy: restore correct transfer length 2017-10-12 11:27:33 +02:00
hwmon hwmon: (gl520sm) Fix overflows and crash seen when writing into limit attributes 2017-10-08 10:14:17 +02:00
hwspinlock
hwtracing stm class: Fix a use-after-free 2017-10-12 11:27:33 +02:00
i2c i2c: riic: correctly finish transfers 2017-11-08 10:06:29 +01:00
ide
idle intel_idle: Support for Intel Xeon Phi Processor x200 Product Family 2016-09-15 08:27:46 +02:00
iio iio: light: fix improper return value 2017-11-30 08:37:27 +00:00
infiniband IB/srp: Avoid that a cable pull can trigger a kernel crash 2017-11-30 08:37:23 +00:00
input Input: ims-psu - check if CDC union descriptor is sane 2017-11-18 11:11:05 +01:00
iommu iommu/arm-smmu-v3: Clear prior settings when updating STEs 2017-11-15 17:13:09 +01:00
ipack
irqchip irqchip/crossbar: Fix incorrect type of local variables 2017-10-21 17:09:04 +02:00
isdn isdn/i4l: fetch the ppp_write buffer in one shot 2017-10-21 17:09:02 +02:00
leds leds: ktd2692: avoid harmless maybe-uninitialized warning 2017-05-14 13:32:55 +02:00
lguest
lightnvm lightnvm: put bio before return 2016-09-24 10:07:35 +02:00
macintosh
mailbox mailbox: handle empty message in tx_tick 2017-08-06 19:19:41 -07:00
mcb
md bcache: recover data from backing when data is clean 2017-12-09 18:42:37 +01:00
media media: v4l2-ctrl: Fix flags field on Control events 2017-11-30 08:37:25 +00:00
memory
memstick memstick: rtsx_usb_ms: Manage runtime PM when accessing the device 2016-10-28 03:01:35 -04:00
message
mfd mfd: axp20x: Fix axp288 PEK_DBR and PEK_DBF irqs being swapped 2017-11-08 10:06:29 +01:00
misc eeprom: at24: check at24_read/write arguments 2017-12-05 11:22:51 +01:00
mmc mmc: core: Do not leave the block driver in a suspended state 2017-12-05 11:22:51 +01:00
mtd mtd: nand: Fix writing mtdoops to nand flash. 2017-12-05 11:22:51 +01:00
net ath10k: set CTS protection VDEV param only if VDEV is up 2017-11-30 08:37:26 +00:00
nfc nfc: fdp: fix NULL pointer dereference 2017-08-06 19:19:40 -07:00
ntb ntb_transport: fix bug calculating num_qps_mw 2017-08-30 10:19:29 +02:00
nubus
nvdimm libnvdimm, namespace: make 'resource' attribute only readable by root 2017-11-30 08:37:23 +00:00
nvme nvme: Fix memory order on async queue deletion 2017-11-24 08:32:25 +01:00
nvmem nvmem: imx-ocotp: Fix wrong register size 2017-08-06 19:19:46 -07:00
of of: device: Export of_device_{get_modalias, uvent_modalias} to modules 2017-07-27 15:06:09 -07:00
oprofile
parisc parisc: pci memory bar assignment fails with 64bit kernels on dino/cujo 2017-08-24 17:02:35 -07:00
parport parisc, parport_gsc: Fixes for printk continuation lines 2017-06-17 06:39:37 +02:00
pci PCI: Apply _HPX settings only to relevant devices 2017-11-30 08:37:26 +00:00
pcmcia
perf drivers/perf: arm_pmu: Fix leak in error path 2016-10-07 15:23:41 +02:00
phy phy: qcom-usb-hs: Add depends on EXTCON 2017-05-14 13:32:57 +02:00
pinctrl pinctrl: samsung: Remove bogus irq_[un]mask from resource management 2017-08-16 13:40:30 -07:00
platform platform/x86: hp-wmi: Do not shadow error values 2017-11-15 17:13:11 +01:00
pnp
power power: supply: bq24190_charger: Handle fault before status on interrupt 2017-05-14 13:32:54 +02:00
powercap
pps
ps3
ptp
pwm pwm: pca9685: Fix period change with same duty cycle 2017-03-15 09:57:14 +08:00
rapidio
ras
regulator regulator: fan53555: fix I2C device ids 2017-11-02 09:40:50 +01:00
remoteproc
reset
rpmsg
rtc rtc: tegra: Implement clock handling 2017-04-21 09:30:07 +02:00
s390 s390/qeth: issue STARTLAN as first IPA command 2017-11-15 17:13:11 +01:00
sbus
scsi scsi: lpfc: Clear the VendorVersion in the PLOGI/PLOGI ACC payload 2017-11-21 09:21:20 +01:00
sfi
sh
sn
soc soc: qcom/spm: shut up uninitialized variable warning 2016-09-24 10:07:42 +02:00
spi spi: sh-msiof: Fix DMA transfer size check 2017-12-09 18:42:39 +01:00
spmi spmi: Include OF based modalias in device uevent 2017-07-27 15:06:10 -07:00
ssb ssb: Fix error routine when fallback SPROM fails 2017-01-09 08:07:42 +01:00
staging staging: iio: cdc: fix improper return value 2017-11-30 08:37:27 +00:00
target target: Fix QUEUE_FULL + SCSI task attribute handling 2017-11-30 08:37:22 +00:00
tc
thermal thermal: cpu_cooling: Avoid accessing potentially freed structures 2017-07-27 15:06:02 -07:00
thunderbolt
tty sysrq : fix Show Regs call trace on ARM 2017-12-09 18:42:40 +01:00
uio uio: fix dmem_region_start computation 2016-10-31 04:13:59 -06:00
usb usb: phy: tahvo: fix error handling in tahvo_usb_probe() 2017-12-09 18:42:39 +01:00
uwb uwb: ensure that endpoint is interrupt 2017-10-12 11:27:35 +02:00
vfio vfio-pci: Handle error from pci_iomap 2017-08-06 19:19:46 -07:00
vhost fix a page leak in vhost_scsi_iov_to_sgl() error recovery 2017-11-30 08:37:22 +00:00
video backlight: adp5520: Fix error handling in adp5520_bl_probe() 2017-11-21 09:21:21 +01:00
virt
virtio virtio_balloon: init 1st buffer in stats vq 2017-03-31 09:49:53 +02:00
vlynq
vme vme: Fix wrong pointer utilization in ca91cx42_slave_get 2017-01-19 20:17:21 +01:00
w1 w1: ds2490: USB transfer buffers need to be DMAable 2017-03-12 06:37:29 +01:00
watchdog watchdog: kempld: fix gcc-4.3 build 2017-10-21 17:09:04 +02:00
xen xen: xenbus driver must not accept invalid transaction ids 2017-11-30 08:37:28 +00:00
zorro
Kconfig
Makefile usb: Make sure usb/phy/of gets built-in 2017-05-20 14:26:59 +02:00