Your message dated Tue, 15 Oct 2024 23:46:26 +0200 with message-id <CA+6XHwQMsTC1Pf9AKuB=J0=9myxun6aqvnapsuqphfftl4j...@mail.gmail.com> and subject line Re: strace: Shows wrong system call has caused the Debian Bug report #459820, regarding strace: Shows wrong system call to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 459820: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=459820 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: strace Version: 4.5.14-2 Severity: normal -- BEGIN TESTCASE PROGRAM -- #include <stdio.h> #include <unistd.h> int main () { printf("--------------------\n"); __asm__("movl $2, %eax; int $0x80"); printf("[i am %d]\n", getpid()); return 0; } -- END TESTCASE PROGRAM -- The testcase code executes fork() by calling it directly. That is, putting 2 (SYS_fork on i386) into eax and doing int 0x80. Let's see how this runs on amd64: -------------------- [i am 10869] [i am 10868] Yep, forks. Now let's see what strace tells about it: <snip> write(1, "--------------------\n", 21-------------------- ) = 21 open(umovestr: Input/output error 0x1, O_WRONLY|0x14[i am 10873] ) = 10873 --- SIGCHLD (Child exited) @ 0 (0) --- getpid() = 10872 write(1, "[i am 10872]\n", 13[i am 10872] ) = 13 exit_group(13) = ? Process 10872 detached The heading line is printed, then there's an open() printed instead of a fork, yet it did fork. Possible cause: 2 is SYS_fork on i386, and this int 0x80 is i386 way of syscalling. amd64 way is SYSCALL orsomethingicantremember, and 2 is SYS_open on amd64. I don't know whether strace is confused, or whether ptrace() gives out something silly. -- System Information: Debian Release: 4.0 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.18-5-amd64 Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Versions of packages strace depends on: ii libc6 2.3.6.ds1-13etch4 GNU C Library: Shared libraries strace recommends no packages. -- no debconf information
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--- Begin Message ---Version: 4.26-0.1 On Thu, 3 Oct 2019 05:37:08 +0300 "Dmitry V. Levin" <[email protected]> wrote: > A ptrace API extension called PTRACE_GET_SYSCALL_INFO has been implemented to > fix this longstanding issue. > > Both strace >= 4.26 and linux kernel >= 5.3 are required to make the fix > available.
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