ci2 starts bisection 2024-02-17 14:40:53.307592403 +0000 UTC m=+123225.304650906 bisecting fixing commit since 80529b4968a8052f894d00021a576d8a2d89aa08 building syzkaller on cb976f63e0177b96eb9ce1c631cc5e2c4b4b0759 ensuring issue is reproducible on original commit 80529b4968a8052f894d00021a576d8a2d89aa08 testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b45e25b72dbeeb520a7886938c791b06c7bb5210c3389cdc83d93a08056ee024 all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] check whether we can drop unnecessary instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN LOCKDEP], they are not needed testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 229a9abec7abb41eba8b370f0ec26ab7eabeda359d30599d312929cd750c847e all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] the bug reproduces without the instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed kconfig minimization: base=3703 full=7267 leaves diff=1983 split chunks (needed=false): <1983> split chunk #0 of len 1983 into 5 parts testing without sub-chunk 1/5 disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e0787e44b1c54b778e27d8ead89f142d017eec329612af156221b2fd4dd754f7 all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [BUG KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: aa9962b4c5c61a3d4b047303be245341ca73fb60bd7bac2d6f8d7ceb97e35e63 all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 69fddb929ddc179af80c12a92d4f42638bf5fc93f94ad3cff826eb61a1622957 all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: eea939f92ed91904c94b34606ad9c0e3d6314da70aba6568b912191ecd48674e all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [BUG KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 80529b4968a8052f894d00021a576d8a2d89aa08 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6d460b1f9ec94ca28cb099edf3e28eec64728cfbb138b05bf3ac7c152c39b1e9 all runs: OK false negative chance: 0.000 minimized to 395 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB FRONTSWAP GPIOLIB HID_ZEROPLUS I2C_MUX IIO IRQ_REMAP LIBNVDIMM MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTPLUG_SPARSE MEMORY_HOTREMOVE MFD_VIPERBOARD PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RC_CORE RFKILL SND SOUND SPI SSB TAP TARGET_CORE TUN USB_AMD5536UDC USB_ATM USB_CONFIGFS USB_CONFIGFS_F_TCM USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_PHONET USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CXACRU USB_CYPRESS_CY7C63 USB_CYTHERM USB_DSBR USB_DUMMY_HCD USB_DWC2 USB_DWC2_HOST USB_DWC2_PCI USB_DWC3 USB_DWC3_GADGET USB_DWC3_OF_SIMPLE USB_DWC3_PCI USB_DWC3_ULPI USB_DYNAMIC_MINORS USB_EG20T USB_EHCI_HCD_PLATFORM USB_EHCI_ROOT_HUB_TT USB_EHSET_TEST_FIXTURE USB_EMI26 USB_EMI62 USB_EPSON2888 USB_EZUSB_FX2 USB_FEW_INIT_RETRIES USB_FOTG210_HCD USB_FOTG210_UDC USB_FTDI_ELAN USB_F_ACM USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI USB_F_NCM USB_F_OBEX USB_F_PHONET USB_F_PRINTER USB_F_RNDIS USB_F_SERIAL USB_F_SS_LB USB_F_SUBSET USB_F_TCM USB_F_UAC1 USB_F_UAC1_LEGACY USB_F_UAC2 USB_F_UVC USB_GADGET USB_GADGETFS USB_GADGET_DEBUG_FILES USB_GADGET_DEBUG_FS USB_GL860 USB_GOKU USB_GPIO_VBUS USB_GR_UDC USB_GSPCA USB_GSPCA_BENQ USB_GSPCA_CONEX USB_GSPCA_CPIA1 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USB_KC2190 USB_KEENE USB_LAN78XX USB_LCD USB_LD USB_LEDS_TRIGGER_USBPORT USB_LED_TRIG USB_LEGOTOWER USB_LIBCOMPOSITE USB_LINK_LAYER_TEST USB_M5602 USB_MA901 USB_MAX3421_HCD USB_MDC800 USB_MICROTEK USB_MR800 USB_MSI2500 USB_MUSB_DUAL_ROLE USB_MUSB_HDRC USB_MV_U3D USB_MV_UDC USB_NET2272 USB_NET2272_DMA USB_NET2280 USB_NET_AX88179_178A USB_NET_AX8817X USB_NET_CDCETHER USB_NET_CDC_EEM USB_NET_CDC_MBIM USB_NET_CDC_NCM USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_CH9200 USB_NET_CX82310_ETH USB_NET_DM9601 USB_NET_GL620A USB_NET_HUAWEI_CDC_NCM USB_NET_INT51X1 USB_NET_KALMIA USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_QMI_WWAN USB_NET_RNDIS_HOST USB_NET_RNDIS_WLAN USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_OXU210HP_HCD USB_PEGASUS USB_PULSE8_CEC USB_PWC USB_PWC_INPUT_EVDEV USB_PXA27X USB_R8A66597 USB_R8A66597_HCD USB_RAINSHADOW_CEC USB_RAREMONO USB_RAW_GADGET USB_RTL8150 USB_RTL8152 USB_RTL8153_ECM USB_S2255 USB_SERIAL USB_SERIAL_AIRCABLE USB_SERIAL_ARK3116 USB_SERIAL_BELKIN USB_SERIAL_CH341 USB_SERIAL_CONSOLE USB_SERIAL_CP210X USB_SERIAL_CYBERJACK USB_SERIAL_CYPRESS_M8 USB_SERIAL_DEBUG USB_SERIAL_DIGI_ACCELEPORT USB_SERIAL_EDGEPORT USB_SERIAL_EDGEPORT_TI USB_SERIAL_EMPEG USB_SERIAL_F81232 USB_SERIAL_F8153X USB_SERIAL_FTDI_SIO USB_SERIAL_GARMIN USB_SERIAL_GENERIC USB_SERIAL_IPAQ USB_SERIAL_IPW USB_SERIAL_IR USB_SERIAL_IUU USB_SERIAL_KEYSPAN USB_SERIAL_KEYSPAN_PDA USB_SERIAL_KLSI USB_SERIAL_KOBIL_SCT USB_SERIAL_MCT_U232 USB_SERIAL_METRO USB_SERIAL_MOS7715_PARPORT USB_SERIAL_MOS7720 USB_SERIAL_MOS7840 USB_SERIAL_MXUPORT USB_SERIAL_NAVMAN USB_SERIAL_OMNINET USB_SERIAL_OPTICON USB_SERIAL_OPTION USB_SERIAL_OTI6858 USB_SERIAL_PL2303 USB_SERIAL_QCAUX USB_SERIAL_QT2 USB_SERIAL_QUALCOMM USB_SERIAL_SAFE USB_SERIAL_SIERRAWIRELESS USB_SERIAL_SIMPLE USB_SERIAL_SPCP8X5 USB_SERIAL_SSU100 USB_SERIAL_SYMBOL USB_SERIAL_TI USB_SERIAL_UPD78F0730 USB_SERIAL_VISOR USB_SERIAL_WHITEHEAT USB_SERIAL_WISHBONE USB_SERIAL_WWAN USB_SERIAL_XR USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STKWEBCAM USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_U132_HCD USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USB_ZR364XX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VETH VFIO VFIO_IOMMU_TYPE1 VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_VDPA VHOST_VSOCK VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOBUF_GEN VIDEOBUF_VMALLOC VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CPIA2 VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_STK1160_COMMON VIDEO_TM6000 VIDEO_TM6000_ALSA VIDEO_TM6000_DVB VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2 VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK X86_SGX X86_X2APIC X86_X32 XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZBUD ZEROPLUS_FF ZONEFS_FS ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD] disabling configs for [HANG LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing current HEAD 6139f2a02fe0ac7a08389b4eb786e0c659039ddd testing commit 6139f2a02fe0ac7a08389b4eb786e0c659039ddd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 585935c1baa5fc465321ee9def28bd4590f6618d0e1134ec863efbc6df206efe all runs: crashed: BUG: unable to handle kernel paging request in copy_from_kernel_nofault representative crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault, types: [UNKNOWN] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 56m6.230817145s (build: 24m0.587822468s, test: 30m17.852049547s) crash still not fixed or there were kernel test errors commit msg: Linux 5.15.148 crash: BUG: unable to handle kernel paging request in copy_from_kernel_nofault BUG: unable to handle page fault for address: ffffffffff600000 #PF: supervisor read access in kernel mode #PF: error_code(0x0001) - permissions violation PGD 2c24067 P4D 2c24067 PUD 2c26067 PMD 2c49067 PTE 8000000002c05165 Oops: 0001 [#1] SMP CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.15.148-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:copy_from_kernel_nofault mm/maccess.c:37 [inline] RIP: 0010:copy_from_kernel_nofault+0x4e/0xf0 mm/maccess.c:25 Code: 25 00 af 01 00 83 80 f8 15 00 00 01 49 83 fc 07 76 3f 31 c9 eb 12 49 83 ec 08 48 83 c5 08 48 83 c3 08 49 83 fc 07 76 29 89 c8 <48> 8b 13 85 c0 48 89 55 00 74 e1 65 48 8b 04 25 00 af 01 00 83 a8 RSP: 0018:ffffc9000006bc98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffffff600000 RCX: 0000000000000000 RDX: 0000000000000030 RSI: 0000000000000008 RDI: ffffffffff600000 RBP: ffffc9000006bd10 R08: ffffffffff600000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000008 R13: ffffffff810ead69 R14: ffff8881017c77b8 R15: ffff888237c2d098 FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600000 CR3: 00000001160d6000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bpf_probe_read_kernel_common kernel/trace/bpf_trace.c:220 [inline] ____bpf_probe_read_kernel kernel/trace/bpf_trace.c:229 [inline] bpf_probe_read_kernel+0x18/0x40 kernel/trace/bpf_trace.c:226 ___bpf_prog_run+0xddc/0x1ef0 kernel/bpf/core.c:1564 __bpf_prog_run32+0x31/0x60 kernel/bpf/core.c:1784 bpf_dispatcher_nop_func include/linux/bpf.h:776 [inline] __bpf_prog_run include/linux/filter.h:625 [inline] bpf_prog_run include/linux/filter.h:632 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline] bpf_trace_run2+0x4f/0xc0 kernel/trace/bpf_trace.c:1920 trace_kfree include/trace/events/kmem.h:118 [inline] kfree+0x2ea/0x490 mm/slub.c:4549 security_cred_free+0x37/0x50 security/security.c:1701 put_cred_rcu+0x44/0xf0 kernel/cred.c:115 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0x2b3/0x670 kernel/rcu/tree.c:2763 __do_softirq+0x88/0x273 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x15/0x20 kernel/softirq.c:913 smpboot_thread_fn+0x9d/0x130 kernel/smpboot.c:164 kthread+0x10b/0x130 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: CR2: ffffffffff600000 ---[ end trace ae63b8e6408ebe8c ]--- RIP: 0010:copy_from_kernel_nofault mm/maccess.c:37 [inline] RIP: 0010:copy_from_kernel_nofault+0x4e/0xf0 mm/maccess.c:25 Code: 25 00 af 01 00 83 80 f8 15 00 00 01 49 83 fc 07 76 3f 31 c9 eb 12 49 83 ec 08 48 83 c5 08 48 83 c3 08 49 83 fc 07 76 29 89 c8 <48> 8b 13 85 c0 48 89 55 00 74 e1 65 48 8b 04 25 00 af 01 00 83 a8 RSP: 0018:ffffc9000006bc98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffffff600000 RCX: 0000000000000000 RDX: 0000000000000030 RSI: 0000000000000008 RDI: ffffffffff600000 RBP: ffffc9000006bd10 R08: ffffffffff600000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000008 R13: ffffffff810ead69 R14: ffff8881017c77b8 R15: ffff888237c2d098 FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600000 CR3: 00000001160d6000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 25 00 af 01 00 and $0x1af00,%eax 5: 83 80 f8 15 00 00 01 addl $0x1,0x15f8(%rax) c: 49 83 fc 07 cmp $0x7,%r12 10: 76 3f jbe 0x51 12: 31 c9 xor %ecx,%ecx 14: eb 12 jmp 0x28 16: 49 83 ec 08 sub $0x8,%r12 1a: 48 83 c5 08 add $0x8,%rbp 1e: 48 83 c3 08 add $0x8,%rbx 22: 49 83 fc 07 cmp $0x7,%r12 26: 76 29 jbe 0x51 28: 89 c8 mov %ecx,%eax * 2a: 48 8b 13 mov (%rbx),%rdx <-- trapping instruction 2d: 85 c0 test %eax,%eax 2f: 48 89 55 00 mov %rdx,0x0(%rbp) 33: 74 e1 je 0x16 35: 65 48 8b 04 25 00 af mov %gs:0x1af00,%rax 3c: 01 00 3e: 83 .byte 0x83 3f: a8 .byte 0xa8