>Synopsis: posix_memalign does not return aligned memory >Category: system >Environment: System : OpenBSD 6.1 Details : OpenBSD 6.1 (GENERIC.MP) #20: Sat Apr 1 13:45:56 MDT 2017 dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
Architecture: OpenBSD.amd64 Machine : amd64 >Description: when compiled, the program below gives: $ ./a.out rc=0 res=cc3061966d0 The 'res' value should be aligned on 64 bytes, i.e., end with either 00, 40, 80, or c0. >How-To-Repeat: ude <stdio.h> #include <stdlib.h> int main() { void *res = NULL; int rc = posix_memalign (&res, 64, 2340); printf ("rc=%d res=%lx\n", rc, (unsigned long) res); } Fix: dmesg: OpenBSD 6.1 (GENERIC.MP) #20: Sat Apr 1 13:45:56 MDT 2017 dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 2130698240 (2031MB) avail mem = 2061508608 (1966MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xf6200 (11 entries) bios0: vendor Seabios version "0.5.1" date 01/01/2011 bios0: Apache Software Foundation CloudStack KVM Hypervisor acpi0 at bios0: rev 0 acpi0: sleep states S5 acpi0: tables DSDT FACP SSDT APIC acpi0: wakeup devices acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: QEMU Virtual CPU version 1.5.3, 2400.38 MHz cpu0: FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,HV,NXE,LONG,LAHF,ABM cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges cpu0: apic clock running at 999MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: QEMU Virtual CPU version 1.5.3, 2400.08 MHz cpu1: FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,HV,NXE,LONG,LAHF,ABM cpu1: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu1: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu1: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped cpu1: smt 0, core 0, package 1 ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins acpiprt0 at acpi0: bus 0 (PCI0) acpicpu0 at acpi0: C1(@1 halt!) acpicpu1 at acpi0: C1(@1 halt!) "ACPI0006" at acpi0 not configured "PNP0303" at acpi0 not configured "PNP0F13" at acpi0 not configured "PNP0700" at acpi0 not configured "PNP0501" at acpi0 not configured "QEMU0002" at acpi0 not configured "ACPI0007" at acpi0 not configured "ACPI0007" at acpi0 not configured pvbus0 at mainbus0: KVM pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02 pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00 pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: <QEMU HARDDISK> wd0: 16-sector PIO, LBA48, 20480MB, 41943040 sectors wd0(pciide0:0:0): using PIO mode 4, DMA mode 2 atapiscsi0 at pciide0 channel 1 drive 0 scsibus1 at atapiscsi0: 2 targets cd0 at scsibus1 targ 0 lun 0: <QEMU, QEMU DVD-ROM, 1.5.> ATAPI 5/cdrom removable cd0(pciide0:1:0): using PIO mode 4, DMA mode 2 uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11 piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9 iic0 at piixpm0 iic0: addr 0x18 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x1a 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x29 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x2b 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x4c 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 iic0: addr 0x4e 00=00 01=00 02=00 03=00 04=00 05=00 06=00 07=00 08=00 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000 vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) em0 at pci0 dev 3 function 0 "Intel 82540EM" rev 0x03: apic 0 int 11, address 06:cf:ba:00:05:32 isa0 at pcib0 isadma0 at isa0 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 1: density unknown com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo 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 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 usb0 at uhci0: USB revision 1.0 uhub0 at usb0 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 uhidev0 at uhub0 port 1 configuration 1 interface 0 "QEMU QEMU USB Tablet" rev 2.00/0.00 addr 2 uhidev0: iclass 3/0 ums0 at uhidev0: 3 buttons, Z dir wsmouse1 at ums0 mux 0 vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets root on wd0a (45fa98c23200d9ec.a) swap on wd0b dump on wd0b usbdevs: Controller /dev/usb0: addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), Intel(0x8086), rev 1.00 port 1 addr 2: full speed, power 100 mA, config 1, QEMU USB Tablet(0x0001), QEMU(0x0627), rev 0.00, iSerialNumber 42 port 2 powered