Kernel Panic iMac "Spinlock acquisition timed out"

Hey guys! I have a 2010 iMac 27" i5 which is crashing a lot lately.
When using Photos, or in this case watching something on Amazon Prime:

I havent't changed anything on the iMac for ages.
Any hints?

Anonymous UUID: 34908894-336E-DE5B-02E2-02548E176848

Tue Aug 7 17:00:41 2018

*** Panic Report ***

panic(cpu 3 caller 0xffffff800a97e634): "Spinlock acquisition timed out: lock=0xffffff8025bf03e8, lock owner thread=0x40000000, current_thread: 0xffffff8025bf03c0, lock owner active on CPU 0xffffffff, current owner: 0x40000000, time: 8671947309628"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-4570.71. 2/osfmk/i386/locks_i386.c:465

Backtrace (CPU 3), Frame : Return Address

0xffffff91281cba80 : 0xffffff800a86c1c6

0xffffff91281cbad0 : 0xffffff800a995274

0xffffff91281cbb10 : 0xffffff800a987544

0xffffff91281cbb80 : 0xffffff800a81e1e0

0xffffff91281cbba0 : 0xffffff800a86bc3c

0xffffff91281cbcd0 : 0xffffff800a86b9fc

0xffffff91281cbd30 : 0xffffff800a97e634

0xffffff91281cbd70 : 0xffffff800a8b07d9

0xffffff91281cbde0 : 0xffffff800a886206

0xffffff91281cbe40 : 0xffffff7f8b6bbc39

0xffffff91281cbea0 : 0xffffff7f8b6bd72d

0xffffff91281cbf00 : 0xffffff800ad9f2fc

0xffffff91281cbf40 : 0xffffff800ae035ff

0xffffff91281cbfa0 : 0xffffff800a81e6b5

Kernel Extensions in backtrace:

com.apple.kec.pthread(1.0)[E64F7A49-CBF0-3251-9F02-3655E3B3DD31]@0xffffff7f8b6b 4000->0xffffff7f8b6c2fff

BSD process name corresponding to current thread: com.apple.WebKit

Mac OS version:

17G65

Kernel version:

Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xnu-4570.71.2~1/RELEASE_X86_64

Kernel UUID: 1AE5ACFD-3B6F-3D74-AD52-31F1430DBC6F

Kernel slide: 0x000000000a600000

Kernel text base: 0xffffff800a800000

__HIB text base: 0xffffff800a700000

System model name: iMac11,3 (Mac-F2238BAE)

System uptime in nanoseconds: 8671949013158

last loaded kext at 10905929592: com.apple.driver.AppleBluetoothMultitouch 92 (addr 0xffffff7f8d0c4000, size 61440)

last unloaded kext at 287767821339: com.apple.driver.usb.AppleUSBUHCI 1.2 (addr 0xffffff7f8ba6a000, size 135168)

loaded kexts:

com.apple.driver.AppleBluetoothMultitouch 92

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AGPM 110.23.37

com.apple.filesystems.ntfs 3.13

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleMikeyHIDDriver 131

com.apple.driver.AppleMikeyDriver 281.52

com.apple.AGDCPluginDisplayMetrics 3.20.13

com.apple.driver.pmtelemetry 1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.driver.AppleHDA 281.52

com.apple.driver.AppleUpstreamUserClient 3.6.5

com.apple.iokit.IOBluetoothSerialManager 6.0.7f10

com.apple.kext.AMDLegacyFramebuffer 1.6.8

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleHV 1

com.apple.kext.AMDRadeonX3000 1.6.8

com.apple.driver.AppleBacklight 170.12.6

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.kext.AMD5000Controller 1.6.8

com.apple.driver.AppleMCCSControl 1.5.5

com.apple.driver.eficheck 1

com.apple.driver.AppleLPC 3.1

com.apple.driver.AppleUSBCardReader 439.70.3

com.apple.driver.AppleIRController 353

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.AppleSystemPolicy 1.0

com.apple.BootCache 40

com.apple.filesystems.hfs.kext 407.50.6

com.apple.iokit.SCSITaskUserClient 404.30.2

com.apple.driver.AppleFWOHCI 5.5.9

com.apple.iokit.AppleBCM5701Ethernet 10.3.1

com.apple.driver.AirPort.Atheros40 700.74.5

com.apple.driver.AppleAHCIPort 329.50.2

com.apple.driver.AppleACPIButtons 6.1

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 6.1

com.apple.driver.AppleAPIC 1.7

com.apple.driver.AppleIntelCPUPowerManagementClient 220.50.1

com.apple.nke.applicationfirewall 183

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleIntelCPUPowerManagement 220.50.1

com.apple.driver.IOBluetoothHIDDriver 6.0.7f10

com.apple.driver.AppleMultitouchDriver 1404.4

com.apple.driver.AppleInputDeviceSupport 1404.3

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 281.52

com.apple.kext.OSvKernDSPLib 526

com.apple.iokit.IOSerialFamily 11

com.apple.iokit.IOAVBFamily 680.2

com.apple.plugin.IOgPTPPlugin 680.15

com.apple.driver.AppleSSE 1.0

com.apple.iokit.IOAcceleratorFamily2 378.26

com.apple.iokit.IOSurface 211.15

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 519.20

com.apple.iokit.IOFireWireIP 2.2.9

com.apple.AppleGPUWrangler 3.20.13

com.apple.AppleGraphicsDeviceControl 3.20.13

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.driver.AppleHDAController 281.52

com.apple.iokit.IOHDAFamily 281.52

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.driver.AppleSMBusController 1.0.18d1

com.apple.driver.IOPlatformPluginFamily 6.0.0d8

com.apple.kext.AMDLegacySupport 1.6.8

com.apple.iokit.IOGraphicsFamily 519.20

com.apple.driver.AppleHIDKeyboard 205

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 6.0.7f10

com.apple.iokit.IOBluetoothHostControllerUSBTransport 6.0.7f10

com.apple.iokit.IOBluetoothHostControllerTransport 6.0.7f10

com.apple.iokit.IOBluetoothFamily 6.0.7f10

com.apple.driver.AppleUSBAudio 312.6

com.apple.iokit.IOAudioFamily 206.5

com.apple.vecLib.kext 1.2.0

com.apple.driver.usb.IOUSBHostHIDDevice 1.2

com.apple.driver.usb.networking 5.0.0

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.2

com.apple.driver.usb.AppleUSBHub 1.2

com.apple.driver.CoreStorage 546.50.1

com.apple.filesystems.hfs.encodings.kext 1

com.apple.iokit.IOSCSIMultimediaCommandsDevice 404.30.2

com.apple.iokit.IOBDStorageFamily 1.8

com.apple.iokit.IODVDStorageFamily 1.8

com.apple.iokit.IOCDStorageFamily 1.8

com.apple.iokit.IOAHCISerialATAPI 267.50.1

com.apple.iokit.IOAHCIBlockStorage 301.40.2

com.apple.iokit.IOFireWireFamily 4.7.2

com.apple.iokit.IOEthernetAVBController 1.1.0

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IO80211Family 1200.12.2

com.apple.driver.corecapture 1.0.4

com.apple.iokit.IOAHCIFamily 288

com.apple.driver.usb.AppleUSBEHCIPCI 1.2

com.apple.driver.usb.AppleUSBEHCI 1.2

com.apple.driver.usb.AppleUSBHostPacketFilter 1.0

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.driver.AppleUSBHostMergeProperties 1.2

com.apple.driver.AppleEFINVRAM 2.1

com.apple.driver.AppleEFIRuntime 2.1

com.apple.iokit.IOSMBusFamily 1.1

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.security.sandbox 300.0

com.apple.kext.AppleMatch 1.0.0d1

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleEffaceableStorage 1.0

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleUSBTDM 439.70.3

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.iokit.IOUSBMassStorageDriver 140.70.2

com.apple.iokit.IOSCSIBlockCommandsDevice 404.30.2

com.apple.iokit.IOSCSIArchitectureModelFamily 404.30.2

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.KernelRelayHost 1

com.apple.iokit.IOUSBHostFamily 1.2

com.apple.driver.usb.AppleUSBCommon 1.0

com.apple.driver.AppleBusPowerController 1.0

com.apple.driver.AppleSEPManager 1.0.1

com.apple.driver.IOSlaveProcessor 1

com.apple.driver.DiskImages 480.60.1

com.apple.iokit.IOStorageFamily 2.1

com.apple.iokit.IOReportFamily 31

com.apple.iokit.IOTimeSyncFamily 680.15

com.apple.iokit.IONetworkingFamily 3.4

com.apple.driver.AppleACPIPlatform 6.1

com.apple.driver.AppleSMC 3.1.9

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.Libm 1

com.apple.kec.pthread 1

com.apple.kec.corecrypto 1.0

EOF

Model: iMac11,3, BootROM IM112.005D.B00, 4 processors, Intel Core i5, 2,8 GHz, 8 GB, SMC 1.59f2

Graphics: ATI Radeon HD 5750, ATI Radeon HD 5750, PCIe

Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54333235533642465238432D48392020

Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54313235533654465238432D48392020

Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54313235533654465238432D48392020

Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54333235533642465238432D48392020

AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.74.0-P2P

Bluetooth: Version 6.0.7f10, 3 services, 27 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: SAMSUNG HD103SJ, 1 TB

Serial ATA Device: HL-DT-STDVDRW GA32N

Serial ATA Device: Crucial_CT128MX100SSD1, 128,04 GB

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: 4-Port USB 2.0 Hub

USB Device: Deskjet 3050A J611 series

USB Device: USB Audio CODEC

USB Device: IR Receiver

USB Device: Built-in iSight

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: Keyboard Hub

USB Device: Apple Keyboard

USB Device: Internal Memory Card Reader

USB Device: BRCM2046 Hub

USB Device: Bluetooth USB Host Controller

Thunderbolt Bus: