Control: reassign -1 clinfo
On 03/08/2022 08.54, Anton Qiu wrote:
Package: ocl-icd-libopencl1
Version: 2.2.14-2
When running clinfo in Raspberry Pi 3 with VC4CL manually installed the clinfo
program reported Segmentation fault.
According to the backtrace, the segfault happened in VC4CL, so either
the bug is there (e.g. it should return an error when queried for
something unknown) or in clinfo (e.g. because it tries to call something
it shouldn't).
Using gdb, I notice the the exception happened when calling clGetExtensionFunctionAddress
("clIcdGetPlatformIDsKHR")
here are the detail
$ sudo gdb clinfo
(gdb) r
Program received signal SIGSEGV, Segmentation fault.
0x0008dc40 in ?? ()
(gdb) bt full
#0 0x0008dc40 in ?? ()
No symbol table info available.
#1 0x76d47564 in clGetExtensionFunctionAddress (name=0x76f97440
"clIcdGetPlatformIDsKHR")
at /home/anton/rpi3opencl/VC4CL/src/extensions.cpp:53
No locals.
#2 0x76f918e4 in ?? () from /lib/arm-linux-gnueabihf/libOpenCL.so.1
No symbol table info available.
(gdb) info register
r0 0x8d8e4 579812
r1 0x76f97440 1996059712
r2 0x53 83
r3 0x8dc40 580672
r4 0x76d47534 1993635124
r5 0x76d48c10 1993640976
r6 0x0 0
r7 0x0 0
r8 0x76f97440 1996059712
r9 0x41350 267088
r10 0x411b8 266680
r11 0x7efff4b4 2130703540
r12 0x76fa8f6c 1996132204
sp 0x7efff4a8 0x7efff4a8
lr 0x76d47564 1993635172
pc 0x8dc40 0x8dc40
cpsr 0x20000010 536870928
fpscr 0x80000000 -2147483648
(gdb) disassemble 0x76d47564
Dump of assembler code for function clGetExtensionFunctionAddress(char const*):
0x76d47534 <+0>: push {r11, lr}
0x76d47538 <+4>: add r11, sp, #4
0x76d4753c <+8>: sub sp, sp, #8
0x76d47540 <+12>: str r0, [r11, #-8]
0x76d47544 <+16>: bl 0x76cf9bd4
<_ZN5vc4cl8Platform16getVC4CLPlatformEv@plt>
0x76d47548 <+20>: mov r3, r0
0x76d4754c <+24>: mov r0, r3
0x76d47550 <+28>: bl 0x76cf0874
<_ZN5vc4cl6ObjectI15_cl_platform_idLin32EE6toBaseEv@plt>
0x76d47554 <+32>: mov r3, r0
0x76d47558 <+36>: ldr r1, [r11, #-8]
0x76d4755c <+40>: mov r0, r3
0x76d47560 <+44>: bl 0x76cf4cfc
<clGetExtensionFunctionAddressForPlatform@plt>
0x76d47564 <+48>: mov r3, r0
0x76d47568 <+52>: mov r0, r3
0x76d4756c <+56>: sub sp, r11, #4
0x76d47570 <+60>: pop {r11, pc}
End of assembler dump.
Looking at the information above, it seems that the exception happens when
calling clGetExtensionFunctionAddressForPlatform()
for "clIcdGetPlatformIDsKHR".
The clinfo program was compiled from source based on repository
"https://github.com/Oblomov/clinfo"; on 02 Aug 2022.
-- System Information:
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
Architecture: armv7l
Kernel: Linux 5.15.56-v7+ (SMP w/4 CPU threads)
Kernel taint flags: TAINT_CRAP
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages ocl-icd-libopencl1 depends on:
ii libc6 2.31-13+rpt2+rpi1+deb11u3
ocl-icd-libopencl1 recommends no packages.
Versions of packages ocl-icd-libopencl1 suggests:
pn opencl-icd <none>
Andreas
