Your message dated Tue, 11 Apr 2017 22:34:09 +0000 with message-id <e1cy4mt-000edc...@fasolo.debian.org> and subject line Bug#857909: fixed in glibc 2.24-10 has caused the Debian Bug report #857909, regarding [libc6-dev] getpid() in child process created using clone(CLONE_VM) returns parent's pid 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 ow...@bugs.debian.org immediately.) -- 857909: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857909 Debian Bug Tracking System Contact ow...@bugs.debian.org with problems
--- Begin Message ---Package: libc6-dev Version: 2.24-9 Severity: grave Dear Maintainer, the program below shows the problem, happening on my Debian laptop. When I create a child using clone(CLONE_VM), glibc's clone wrapper does not update cached pid, and I receive parent's pid in getpid(). Here is output of the program: $strace -o strace.log -f ./a.out parent: pid=17530 parent: fork pid=17531 1)child: pid=17531 2)child: pid=17530 When CLONE_VM flag is not passed, the problem does not occur. My case is not in the list of the cases, described in clone(2), when wrong pid may be returned, so this is a BUG. Regards, Kirill P.S. Strange, but reportbug-ng did not fill packages versions. So, I do this manually: $ dpkg-query -l 'libc6*' Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-=============================-===================-===================-================================================================ ii libc6:amd64 2.24-9 amd64 GNU C Library: Shared libraries ii libc6:i386 2.24-9 i386 GNU C Library: Shared libraries ii libc6-amd64:i386 2.24-9 i386 GNU C Library: 64bit Shared libraries for AMD64 ii libc6-arm64-cross 2.24-9cross3 all GNU C Library: Shared libraries (for cross-compiling) un libc6-arm64-dcv1 <none> <none> (no description available) ii libc6-dbg:amd64 2.24-9 amd64 GNU C Library: detached debugging symbols ii libc6-dev:amd64 2.24-9 amd64 GNU C Library: Development Libraries and Header Files ii libc6-dev-arm64-cross 2.24-9cross3 all GNU C Library: Development Libraries and Header Files (for cross un libc6-dev-arm64-dcv1 <none> <none> (no description available) ii libc6-dev-i386 2.24-9 amd64 GNU C Library: 32-bit development libraries for AMD64 ii libc6-dev-x32 2.24-9 amd64 GNU C Library: X32 ABI Development Libraries for AMD64 ii libc6-i386 2.24-9 amd64 GNU C Library: 32-bit shared libraries for AMD64 un libc6-i686 <none> <none> (no description available) ii libc6-x32 2.24-9 amd64 GNU C Library: X32 ABI Shared libraries for AMD64 un libc6.1 <none> <none> (no description available) un libc6.1-dev <none> <none> (no description available) un libc6.1-dev-arm64-cross <none> <none> (no description available) #define _GNU_SOURCE #include <sched.h> #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <errno.h> #include <sys/syscall.h> #include <sys/mman.h> #include <signal.h> int child(void *a) { printf("1)child: pid=%d\n", syscall(__NR_getpid)); printf("2)child: pid=%d\n", getpid()); return 0; } int main(void) { int stack_size = 2 * 1024 * 1024; char *stack = mmap(NULL, stack_size, PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); pid_t pid; if (stack == MAP_FAILED) { perror("Can't allocate stack"); exit(1); } setbuf(stdout, NULL); printf("parent: pid=%d\n", getpid()); pid = clone(child, stack + stack_size, CLONE_VM | CLONE_FILES | SIGCHLD, NULL); printf("parent: fork pid=%d\n", pid); } --- System information. --- Architecture: Kernel: Linux 4.10.1+ Debian Release: 9.0 500 unstable ftp.ru.debian.org 500 testing ftp.ru.debian.org 500 stable-updates ftp.ru.debian.org 500 stable security.debian.org 500 stable ftp.ru.debian.org 1 experimental ftp.ru.debian.org --- Package information. --- Depends (Version) | Installed ===============================-+-============= libc6 (= 2.24-9) | libc-dev-bin (= 2.24-9) | linux-libc-dev (>= 4.9.2-2) | Package's Recommends field is empty. Suggests (Version) | Installed ===========================-+-=========== glibc-doc | manpages-dev | 4.09-217530 execve("./a.out", ["./a.out"], [/* 48 vars */]) = 0 17530 brk(NULL) = 0x123e000 17530 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 17530 mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb686e47000 17530 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) 17530 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 17530 fstat(3, {st_mode=S_IFREG|0644, st_size=190344, ...}) = 0 17530 mmap(NULL, 190344, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fb686e18000 17530 close(3) = 0 17530 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 17530 open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 17530 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\3\2\0\0\0\0\0"..., 832) = 832 17530 fstat(3, {st_mode=S_IFREG|0755, st_size=1685264, ...}) = 0 17530 mmap(NULL, 3791264, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb686889000 17530 mprotect(0x7fb686a1e000, 2093056, PROT_NONE) = 0 17530 mmap(0x7fb686c1d000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x194000) = 0x7fb686c1d000 17530 mmap(0x7fb686c23000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fb686c23000 17530 close(3) = 0 17530 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb686e16000 17530 arch_prctl(ARCH_SET_FS, 0x7fb686e16700) = 0 17530 mprotect(0x7fb686c1d000, 16384, PROT_READ) = 0 17530 mprotect(0x600000, 4096, PROT_READ) = 0 17530 mprotect(0x7fb686e4a000, 4096, PROT_READ) = 0 17530 munmap(0x7fb686e18000, 190344) = 0 17530 mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb686689000 17530 getpid() = 17530 17530 write(1, "parent: pid=17530\n", 18) = 18 17530 clone(child_stack=0x7fb686888ff0, flags=CLONE_VM|CLONE_FILES|SIGCHLD) = 17531 17531 getpid( <unfinished ...> 17530 write(1, "parent: fork pid=17531\n", 23 <unfinished ...> 17531 <... getpid resumed> ) = 17531 17530 <... write resumed> ) = 23 17530 exit_group(0) = ? 17531 write(1, "1)child: pid=17531\n", 19 <unfinished ...> 17530 +++ exited with 0 +++ 17531 <... write resumed> ) = 19 17531 write(1, "2)child: pid=17530\n", 19) = 19 17531 exit_group(0) = ? 17531 +++ exited with 0 +++
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--- Begin Message ---Source: glibc Source-Version: 2.24-10 We believe that the bug you reported is fixed in the latest version of glibc, which is due to be installed in the Debian FTP archive. A summary of the changes between this version and the previous one is attached. Thank you for reporting the bug, which will now be closed. If you have further comments please address them to 857...@bugs.debian.org, and the maintainer will reopen the bug report if appropriate. Debian distribution maintenance software pp. Aurelien Jarno <aure...@debian.org> (supplier of updated glibc package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing ftpmas...@ftp-master.debian.org) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Wed, 12 Apr 2017 00:13:55 +0200 Source: glibc Binary: libc-bin libc-dev-bin libc-l10n glibc-doc glibc-source locales locales-all nscd multiarch-support libc6 libc6-dev libc6-dbg libc6-pic libc6-udeb libc6.1 libc6.1-dev libc6.1-dbg libc6.1-pic libc6.1-udeb libc0.3 libc0.3-dev libc0.3-dbg libc0.3-pic libc0.3-udeb libc0.1 libc0.1-dev libc0.1-dbg libc0.1-pic libc0.1-udeb libc6-i386 libc6-dev-i386 libc6-sparc libc6-dev-sparc libc6-sparc64 libc6-dev-sparc64 libc6-s390 libc6-dev-s390 libc6-amd64 libc6-dev-amd64 libc6-powerpc libc6-dev-powerpc libc6-ppc64 libc6-dev-ppc64 libc6-mips32 libc6-dev-mips32 libc6-mipsn32 libc6-dev-mipsn32 libc6-mips64 libc6-dev-mips64 libc0.1-i386 libc0.1-dev-i386 libc6-x32 libc6-dev-x32 libc6-xen libc0.3-xen libc6.1-alphaev67 libc0.1-i686 libc0.3-i686 libc6-i686 Architecture: source Version: 2.24-10 Distribution: unstable Urgency: medium Maintainer: GNU Libc Maintainers <debian-gl...@lists.debian.org> Changed-By: Aurelien Jarno <aure...@debian.org> Description: glibc-doc - GNU C Library: Documentation glibc-source - GNU C Library: sources libc-bin - GNU C Library: Binaries libc-dev-bin - GNU C Library: Development binaries libc-l10n - GNU C Library: localization files libc0.1 - GNU C Library: Shared libraries libc0.1-dbg - GNU C Library: detached debugging symbols libc0.1-dev - GNU C Library: Development Libraries and Header Files libc0.1-dev-i386 - GNU C Library: 32bit development libraries for AMD64 libc0.1-i386 - GNU C Library: 32bit shared libraries for AMD64 libc0.1-i686 - transitional dummy package libc0.1-pic - GNU C Library: PIC archive library libc0.1-udeb - GNU C Library: Shared libraries - udeb (udeb) libc0.3 - GNU C Library: Shared libraries libc0.3-dbg - GNU C Library: detached debugging symbols libc0.3-dev - GNU C Library: Development Libraries and Header Files libc0.3-i686 - transitional dummy package libc0.3-pic - GNU C Library: PIC archive library libc0.3-udeb - GNU C Library: Shared libraries - udeb (udeb) libc0.3-xen - GNU C Library: Shared libraries [Xen version] libc6 - GNU C Library: Shared libraries libc6-amd64 - GNU C Library: 64bit Shared libraries for AMD64 libc6-dbg - GNU C Library: detached debugging symbols libc6-dev - GNU C Library: Development Libraries and Header Files libc6-dev-amd64 - GNU C Library: 64bit Development Libraries for AMD64 libc6-dev-i386 - GNU C Library: 32-bit development libraries for AMD64 libc6-dev-mips32 - GNU C Library: o32 Development Libraries for MIPS libc6-dev-mips64 - GNU C Library: 64bit Development Libraries for MIPS64 libc6-dev-mipsn32 - GNU C Library: n32 Development Libraries for MIPS64 libc6-dev-powerpc - GNU C Library: 32bit powerpc development libraries for ppc64 libc6-dev-ppc64 - GNU C Library: 64bit Development Libraries for PowerPC64 libc6-dev-s390 - GNU C Library: 32bit Development Libraries for IBM zSeries libc6-dev-sparc - GNU C Library: 32bit Development Libraries for SPARC libc6-dev-sparc64 - GNU C Library: 64bit Development Libraries for UltraSPARC libc6-dev-x32 - GNU C Library: X32 ABI Development Libraries for AMD64 libc6-i386 - GNU C Library: 32-bit shared libraries for AMD64 libc6-i686 - transitional dummy package libc6-mips32 - GNU C Library: o32 Shared libraries for MIPS libc6-mips64 - GNU C Library: 64bit Shared libraries for MIPS64 libc6-mipsn32 - GNU C Library: n32 Shared libraries for MIPS64 libc6-pic - GNU C Library: PIC archive library libc6-powerpc - GNU C Library: 32bit powerpc shared libraries for ppc64 libc6-ppc64 - GNU C Library: 64bit Shared libraries for PowerPC64 libc6-s390 - GNU C Library: 32bit Shared libraries for IBM zSeries libc6-sparc - GNU C Library: 32bit Shared libraries for SPARC libc6-sparc64 - GNU C Library: 64bit Shared libraries for UltraSPARC libc6-udeb - GNU C Library: Shared libraries - udeb (udeb) libc6-x32 - GNU C Library: X32 ABI Shared libraries for AMD64 libc6-xen - GNU C Library: Shared libraries [Xen version] libc6.1 - GNU C Library: Shared libraries libc6.1-alphaev67 - GNU C Library: Shared libraries (EV67 optimized) libc6.1-dbg - GNU C Library: detached debugging symbols libc6.1-dev - GNU C Library: Development Libraries and Header Files libc6.1-pic - GNU C Library: PIC archive library libc6.1-udeb - GNU C Library: Shared libraries - udeb (udeb) locales - GNU C Library: National Language (locale) data [support] locales-all - GNU C Library: Precompiled locale data multiarch-support - Transitional package to ensure multiarch compatibility nscd - GNU C Library: Name Service Cache Daemon Closes: 857909 Changes: glibc (2.24-10) unstable; urgency=medium . [ Samuel Thibault ] * hurd-i386/cvs-truncate64.diff: New patch to support 64bit truncate. * hurd-i386/cvs-send-recv-posix.diff: New patch to make send/recv more posix. . [ Aurelien Jarno ] * debian/patches/git-updates.diff: update from upstream stable branch: - Fix readahead on mips64el. - Improve branch predication in _dl_runtime_resolve_avx512_opt; - Fix symbol redirect for fts_set on 32-bit architectures. - Fix AVX2/AVX512 optimized unaligned memset. - Don't use PLT nor GOT in static archives on amd64. - Drop GLIBC_TUNABLES in setxid processes. - Fix write-after-destroy in lock elision on powerpc/ppc64el. * Drop patches/any/cvs-resolv-internal-qtype.diff, merged upstream. * any/cvs-remove-pid-tid-cache-clone.diff: patch from upstream to remove cached PID/TID in clone. Closes: #857909. * debian/rules.d/build.mk: do not fail the build in case of testsuite regressions when building a +debXuX version. That way changes in the environment (e.g.: kernel) do not prevent security or stable versions to be built. 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