Executing `QEMU_STRACE= ./out` here gives:
259 brk(NULL) = 0x0000000000421000 259 uname(0x40008003d8) = 0 259 faccessat(AT_FDCWD,"/etc/ld.so.preload",R_OK,AT_SYMLINK_NOFOLLOW|0x50) = -1 errno=2 (No such file or directory) 259 openat(AT_FDCWD,"/etc/ld.so.cache",O_RDONLY|O_CLOEXEC) = 3 259 fstat(3,0x00000040007ff960) = 0 259 mmap(NULL,13646,PROT_READ,MAP_PRIVATE,3,0) = 0x0000004000843000 259 close(3) = 0 259 openat(AT_FDCWD,"/lib64/libaio.so.1",O_RDONLY|O_CLOEXEC) = 3 259 read(3,0x7ffb20,832) = 832 259 fstat(3,0x00000040007ff9b0) = 0 259 mmap(NULL,131096,PROT_EXEC|PROT_READ,MAP_PRIVATE|MAP_DENYWRITE,3,0) = 0x0000004000847000 259 mprotect(0x0000004000849000,118784,PROT_NONE) = 0 259 mmap(0x0000004000866000,4096,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_DENYWRITE|MAP_FIXED,3,0xf000) = 0x0000004000866000 259 mmap(0x0000004000867000,24,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED,-1,0) = 0x0000004000867000 259 close(3) = 0 259 openat(AT_FDCWD,"/lib64/libc.so.6",O_RDONLY|O_CLOEXEC) = 3 259 read(3,0x7ffb00,832) = 832 259 fstat(3,0x00000040007ff990) = 0 259 mmap(NULL,8192,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS,-1,0) = 0x0000004000868000 259 mmap(NULL,1527680,PROT_EXEC|PROT_READ,MAP_PRIVATE|MAP_DENYWRITE,3,0) = 0x000000400086a000 259 mprotect(0x00000040009c3000,77824,PROT_NONE) = 0 259 mmap(0x00000040009d6000,24576,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_DENYWRITE|MAP_FIXED,3,0x15c000) = 0x00000040009d6000 259 mmap(0x00000040009dc000,12160,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED,-1,0) = 0x00000040009dc000 259 close(3) = 0 259 mprotect(0x00000040009d6000,16384,PROT_READ) = 0 259 mprotect(0x0000004000866000,4096,PROT_READ) = 0 259 mprotect(0x000000000041f000,4096,PROT_READ) = 0 259 mprotect(0x0000004000840000,4096,PROT_READ) = 0 259 munmap(0x0000004000843000,13646) = 0 259 brk(NULL) = 0x0000000000421000 259 brk(0x0000000000442000) = 0x0000000000442000 259 brk(NULL) = 0x0000000000442000 259 io_setup(10,4330144,4330160,4330144,274886726560,511) = -1 errno=38 (Function not implemented) 259 io_destroy(0,274886726560,38,274886726560,511,512) = -1 errno=38 (Function not implemented) 259 fstat(1,0x0000004000800388) = 0 259 write(1,0x4212c0,11)res is: -38 = 11 259 exit_group(0) Thanks for looking into this issue, Laurent Vivier! -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1884719 Title: Function not implemented when using libaio Status in QEMU: New Bug description: Hello I experience "Function not implemented" errors when trying to use Linux libaio library in foreign architecture, e.g. aarch64. I've faced this problem while using https://github.com/multiarch/qemu-user-static, i.e. Docker+QEMU. I understand that I do not use plain QEMU and you may count this report as a "distribution of QEMU"! Just let me know what are the steps to test it with plain QEMU and I will test and update this ticket! Here are the steps to reproduce the issue: 1) On x86_64 machine register QEMU: `docker run -it --rm --privileged multiarch/qemu-user-static --reset --credential yes --persistent yes` 2) Start a Docker image with foreign CPU architecture, e.g. aarch64 `docker run -it arm64v8/centos:8 bash` 3) Inside the Docker container install GCC and libaio `yum install gcc libaio libaio-devel` 4) Compile the following C program ``` #include <stdio.h> #include <errno.h> #include <libaio.h> #include <stdlib.h> struct io_control { io_context_t ioContext; }; int main() { int queueSize = 10; struct io_control * theControl = (struct io_control *) malloc(sizeof(struct io_control)); if (theControl == NULL) { printf("theControl is NULL"); return 123; } int res = io_queue_init(queueSize, &theControl->ioContext); io_queue_release(theControl->ioContext); free(theControl); printf("res is: %d", res); } ``` ``` cat > test.c [PASTE THE CODE ABOVE HERE] ^D ``` `gcc test.c -o out -laio && ./out` When executed directly on aarch64 machine (i.e. without emulation) or on x86_64 Docker image (e.g. centos:8) it prints `res is: 0`, i.e. it successfully initialized a LibAIO queue. But when executed on Docker image with foreign/emulated CPU architecture it prints `res is: -38` (ENOSYS). `man io_queue_init` says that error ENOSYS is returned when "Not implemented." Environment: QEMU version: 5.0.0.2 (https://github.com/multiarch/qemu-user-static/blob/master/.travis.yml#L24-L28) Container application: Docker Output of `docker --version`: ``` Client: Version: 19.03.8 API version: 1.40 Go version: go1.13.8 Git commit: afacb8b7f0 Built: Wed Mar 11 23:42:35 2020 OS/Arch: linux/amd64 Experimental: false Server: Engine: Version: 19.03.8 API version: 1.40 (minimum version 1.12) Go version: go1.13.8 Git commit: afacb8b7f0 Built: Wed Mar 11 22:48:33 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.3.3-0ubuntu2 GitCommit: runc: Version: spec: 1.0.1-dev GitCommit: docker-init: Version: 0.18.0 GitCommit: ``` Same happens with Ubuntu (arm64v8/ubuntu:focal). I've tried to `strace` it but : ``` /usr/bin/strace: ptrace(PTRACE_TRACEME, ...): Function not implemented /usr/bin/strace: PTRACE_SETOPTIONS: Function not implemented /usr/bin/strace: detach: waitpid(112): No child processes /usr/bin/strace: Process 112 detached ``` Here are the steps to reproduce the problem with strace: ``` docker run --rm -it --security-opt seccomp:unconfined --security-opt apparmor:unconfined --privileged --cap-add ALL arm64v8/centos:8 bash yum install -y strace` strace echo Test ``` Note: I used --privileged, disabled seccomp and apparmor, and added all capabilities Disabling security solves the "Permission denied" problem but then comes the "Not implemented" one. Any idea what could be the problem and how to work it around ? I've googled a lot but I wasn't able to find any problems related to libaio on QEMU. Thank you! Martin To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1884719/+subscriptions
