On 6.0-STABLE, I'm able to mount my one-and-only Exfat drive (a 128GB PNY flash drive) just fine. The drive also mounts fine on Windows, OS X and both OpenBSD-STABLE amd64 and i386. The package is fuse-exfat-1.1.0 maintained by Helg Bredow.
For the past several months, I've been running snapshots on my primary laptop, and I cannot mount this drive. The package I see is exfat-fuse-1.2.4 maintained by YASUOKA Masahiko. fuse-exfat seems to not be in the repository any longer. I am copying maintainers of both packages on this email to ports@. On -CURRENT, mount.exfat-fuse exits with an error code of 1 without any explanation even with the -d flag, and doesn't mount the drive. Included is output from -CURRENT and a dmesg. I can provide output of success on -STABLE if required. [axon@transient ~]$ dmesg| tail -n 4 umass1: using SCSI over Bulk-Only scsibus5 at umass1: 2 targets, initiator 0 sd3 at scsibus5 targ 1 lun 0: <PNY, USB 2.0 FD, 1100> SCSI2 0/direct removable serial.154b005b45YD26000352 sd3: 122791MB, 512 bytes/sector, 251477760 sectors [axon@transient ~]$ doas disklabel sd3 doas (a...@transient.labs.h-i-r.net) password: # /dev/rsd3c: type: SCSI disk: SCSI disk label: USB 2.0 FD duid: 0000000000000000 flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 15653 total sectors: 251477760 boundstart: 0 boundend: 251477760 drivedata: 0 16 partitions: # size offset fstype [fsize bsize cpg] c: 251477760 0 unused i: 251477758 2 NTFS [axon@transient ~]$ doas mount.exfat-fuse /dev/sd3i /mnt FUSE exfat 1.2.4 [axon@transient ~]$ df -h /mnt Filesystem Size Used Avail Capacity Mounted on /dev/sd2a 1005M 53.2M 901M 6% / <-- Note this is root on softraid crypto at sd2a, not sd3i. [axon@transient ~]$ doas mount.exfat-fuse /dev/sd3i /mnt FUSE exfat 1.2.4 [axon@transient ~]$ echo $? 1 [axon@transient ~]$ doas mount.exfat-fuse -d /dev/sd3i /mnt FUSE exfat 1.2.4 [axon@transient ~]$ echo $? 1 OpenBSD 6.0-current (GENERIC.MP) #0: Mon Nov 28 14:42:19 MST 2016 bu...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP RTC BIOS diagnostic error 80<clock_battery> real mem = 8227655680 (7846MB) avail mem = 7973707776 (7604MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.6 @ 0xe9d90 (47 entries) bios0: vendor Acer version "V1.07" date 11/07/2011 bios0: Acer Aspire 5733Z acpi0 at bios0: rev 2 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP ASF! HPET APIC MCFG SLIC BOOT ASPT DMAR SSDT SSDT SSDT acpi0: wakeup devices AZAL(S3) P0P1(S4) EHC1(S3) USB1(S3) USB2(S3) USB3(S3) USB4(S3) USB5(S3) USB6(S3) USB7(S3) RP01(S4) PEG5(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpihpet0 at acpi0: 14318179 Hz acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz, 2527.86 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG,LAHF,PERF,ITSC,SENSOR,ARAT cpu0: 256KB 64b/line 8-way L2 cache cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges cpu0: apic clock running at 133MHz cpu0: mwait min=64, max=64, C-substates=0.2.1.1, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz, 2527.45 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG,LAHF,PERF,ITSC,SENSOR,ARAT cpu1: 256KB 64b/line 8-way L2 cache cpu1: smt 1, core 0, package 0 cpu2 at mainbus0: apid 4 (application processor) cpu2: Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz, 2527.45 MHz cpu2: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG,LAHF,PERF,ITSC,SENSOR,ARAT cpu2: 256KB 64b/line 8-way L2 cache cpu2: smt 0, core 2, package 0 cpu3 at mainbus0: apid 5 (application processor) cpu3: Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz, 2527.45 MHz cpu3: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG,LAHF,PERF,ITSC,SENSOR,ARAT cpu3: 256KB 64b/line 8-way L2 cache cpu3: smt 1, core 2, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (P0P2) acpiprt2 at acpi0: bus 3 (P0P1) acpiprt3 at acpi0: bus 1 (RP01) acpiprt4 at acpi0: bus 2 (RP02) acpiprt5 at acpi0: bus -1 (RP03) acpiprt6 at acpi0: bus -1 (RP04) acpiprt7 at acpi0: bus -1 (RP05) acpiprt8 at acpi0: bus -1 (RP06) acpiprt9 at acpi0: bus -1 (RP07) acpiprt10 at acpi0: bus -1 (RP08) acpiprt11 at acpi0: bus -1 (PEG5) acpiec0 at acpi0 acpicpu0 at acpi0: C3(350@245 mwait.3@0x20), C2(500@205 mwait.3@0x10), C1(1000@3 mwait.1), PSS acpicpu1 at acpi0: C3(350@245 mwait.3@0x20), C2(500@205 mwait.3@0x10), C1(1000@3 mwait.1), PSS acpicpu2 at acpi0: C3(350@245 mwait.3@0x20), C2(500@205 mwait.3@0x10), C1(1000@3 mwait.1), PSS acpicpu3 at acpi0: C3(350@245 mwait.3@0x20), C2(500@205 mwait.3@0x10), C1(1000@3 mwait.1), PSS "pnp0c14" at acpi0 not configured acpibat0 at acpi0: BAT0 model "Li_Ion_4000mA " serial 716a type Lion oem "SANYO " acpiac0 at acpi0: AC unit online acpibtn0 at acpi0: PWRB acpibtn1 at acpi0: LID0 acpibtn2 at acpi0: SLPB "PNP0303" at acpi0 not configured "ETD0500" at acpi0 not configured "PNP0C14" at acpi0 not configured "PNP0C14" at acpi0 not configured acpivideo0 at acpi0: GFX0 acpivout0 at acpivideo0: DD03 acpivideo1 at acpi0: VGA_ cpu0: Enhanced SpeedStep 2527 MHz: speeds: 2533, 2399, 2266, 2133, 1999, 1866, 1733, 1599, 1466, 1333, 1199 MHz pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel Core Host" rev 0x02 inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x02 drm0 at inteldrm0 intagp0 at inteldrm0 agp0 at intagp0: aperture at 0xc0000000, size 0x10000000 inteldrm0: msi inteldrm0: 1366x768 wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) "Intel 3400 MEI" rev 0x06 at pci0 dev 22 function 0 not configured ehci0 at pci0 dev 26 function 0 "Intel 3400 USB" rev 0x05: apic 2 int 16 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 azalia0 at pci0 dev 27 function 0 "Intel 3400 HD Audio" rev 0x05: msi azalia0: codecs: Realtek ALC272 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 3400 PCIE" rev 0x05: msi pci1 at ppb0 bus 1 bge0 at pci1 dev 0 function 0 "Broadcom BCM57780" rev 0x01, BCM57780 A1 (0x57780001): msi, address dc:0e:a1:91:7a:b9 brgphy0 at bge0 phy 1: BCM57780 10/100/1000baseT PHY, rev. 1 ppb1 at pci0 dev 28 function 1 "Intel 3400 PCIE" rev 0x05: msi pci2 at ppb1 bus 2 athn0 at pci2 dev 0 function 0 "Atheros AR9285" rev 0x01: apic 2 int 17 athn0: AR9285 rev 2 (1T1R), ROM rev 13, address 00:25:d3:f4:f8:4b ehci1 at pci0 dev 29 function 0 "Intel 3400 USB" rev 0x05: apic 2 int 23 usb1 at ehci1: USB revision 2.0 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xa5 pci3 at ppb2 bus 3 pcib0 at pci0 dev 31 function 0 "Intel HM55 LPC" rev 0x05 ahci0 at pci0 dev 31 function 2 "Intel 3400 AHCI" rev 0x05: msi, AHCI 1.3 ahci0: port 0: 3.0Gb/s ahci0: port 1: 1.5Gb/s scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, SanDisk SDSSDA12, Z320> SCSI3 0/direct fixed naa.5001b444a668bf8d sd0: 114473MB, 512 bytes/sector, 234441648 sectors, thin cd0 at scsibus1 targ 1 lun 0: <HL-DT-ST, DVDRAM GT51N, 1.00> ATAPI 5/cdrom removable ichiic0 at pci0 dev 31 function 3 "Intel 3400 SMBus" rev 0x05: apic 2 int 19 iic0 at ichiic0 spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-10600 SO-DIMM spdmem1 at iic0 addr 0x52: 4GB DDR3 SDRAM PC3-10600 SO-DIMM itherm0 at pci0 dev 31 function 6 "Intel 3400 Thermal" rev 0x05 isa0 at pcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 pms0: Elantech Touchpad, version 2, firmware 0x40213 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 pci4 at mainbus0 bus 255 pchb1 at pci4 dev 0 function 0 "Intel QuickPath" rev 0x02 pchb2 at pci4 dev 0 function 1 "Intel QuickPath" rev 0x02 pchb3 at pci4 dev 2 function 0 "Intel QPI Link" rev 0x02 pchb4 at pci4 dev 2 function 1 "Intel QPI Physical" rev 0x02 pchb5 at pci4 dev 2 function 2 "Intel Reserved" rev 0x02 pchb6 at pci4 dev 2 function 3 "Intel Reserved" rev 0x02 vmm0 at mainbus0: VMX/EPT uhub2 at uhub0 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2 uvideo0 at uhub2 port 1 configuration 1 interface 0 "SuYin 1.3M HD WebCam" rev 2.00/1.02 addr 3 video0 at uvideo0 umass0 at uhub2 port 2 configuration 1 interface 0 "Generic USB2.0-CRW" rev 2.00/38.82 addr 4 umass0: using SCSI over Bulk-Only scsibus2 at umass0: 2 targets, initiator 0 sd1 at scsibus2 targ 1 lun 0: <Generic-, Multi-Card, 1.00> SCSI0 0/direct removable serial.0bda0138516388200000 uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2 vscsi0 at root scsibus3 at vscsi0: 256 targets softraid0 at root scsibus4 at softraid0: 256 targets softraid0: sd2 was not shutdown properly sd2 at scsibus4 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed sd2: 114470MB, 512 bytes/sector, 234435953 sectors root on sd2a (6ece0cd095375a76.a) swap on sd2b dump on sd2b WARNING: / was not properly unmounted