Hi Tim, I just tested this in a fresh yakkety VM using the daily cloud images and the kernel team PPA you mentioned and reproduced it with your program:
ubuntu@yakkety:~$ strace ./tester execve("./tester", ["./tester"], [/* 17 vars */]) = 0 brk(NULL) = 0x55dbbabdf000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f444ba48000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=23765, ...}) = 0 mmap(NULL, 23765, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f444ba42000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1864888, ...}) = 0 mmap(NULL, 3967488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f444b45c000 mprotect(0x7f444b61c000, 2093056, PROT_NONE) = 0 mmap(0x7f444b81b000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bf000) = 0x7f444b81b000 mmap(0x7f444b821000, 14848, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f444b821000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f444ba41000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f444ba40000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f444ba3f000 arch_prctl(ARCH_SET_FS, 0x7f444ba40700) = 0 mprotect(0x7f444b81b000, 16384, PROT_READ) = 0 mprotect(0x55dbb9616000, 4096, PROT_READ) = 0 mprotect(0x7f444ba4a000, 4096, PROT_READ) = 0 munmap(0x7f444ba42000, 23765) = 0 nanosleep({1, 0}, 0x7ffd91f7c6c0) = 0 gettimeofday({1465946468, 561043}, {tz_minuteswest=0, tz_dsttime=0}) = 0 fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(4, 64), ...}) = 0 ioctl(1, TCGETS, {B9600 opost isig icanon echo ...}) = 0 brk(NULL) = 0x55dbbabdf000 brk(0x55dbbac01000) = 0x55dbbac01000 write(1, "sec 1465946468\n", 15sec 1465946468 ) = 15 nanosleep({1, 0}, 0x7ffd91f7c6c0) = 0 gettimeofday({1465946469, 567377}, {tz_minuteswest=0, tz_dsttime=0}) = 0 write(1, "sec 1465946469\n", 15sec 1465946469 ) = 15 nanosleep({1, 0}, 0x7ffd91f7c6c0) = 0 gettimeofday({1465946470, 570615}, {tz_minuteswest=0, tz_dsttime=0}) = 0 write(1, "sec 1465946470\n", 15sec 1465946470 ) = 15 nanosleep({1, 0}, 0x7ffd91f7c6c0) = 0 gettimeofday({1465946471, 574084}, {tz_minuteswest=0, tz_dsttime=0}) = 0 write(1, "sec 1465946471\n", 15sec 1465946471 ) = 15 nanosleep({1, 0}, 0x7ffd91f7c6c0) = 0 gettimeofday({1465946472, 576646}, {tz_minuteswest=0, tz_dsttime=0}) = 0 write(1, "sec 1465946472\n", 15sec 1465946472 ) = 15 nanosleep({1, 0}, ^Cstrace: Process 1490 detached <detached ...> ubuntu@yakkety:~$ uname -a Linux yakkety 4.6.0-7-generic #8-Ubuntu SMP Fri Jun 3 15:08:18 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ubuntu@yakkety:~$ apt-cache showpkg linux-image-4.6.0-7-generic Package: linux-image-4.6.0-7-generic Versions: 4.6.0-7.8 (/var/lib/apt/lists/ppa.launchpad.net_canonical-kernel-team_ppa_ubuntu_dists_yakkety_main_binary-amd64_Packages) (/var/lib/dpkg/status) Description Language: File: /var/lib/apt/lists/ppa.launchpad.net_canonical-kernel-team_ppa_ubuntu_dists_yakkety_main_binary-amd64_Packages MD5: eb70ad30d136e11219815e66f14ab797 Description Language: en File: /var/lib/apt/lists/ppa.launchpad.net_canonical-kernel-team_ppa_ubuntu_dists_yakkety_main_i18n_Translation-en MD5: eb70ad30d136e11219815e66f14ab797 Reverse Depends: linux-image-generic,linux-image-4.6.0-7-generic linux-image-extra-4.6.0-7-generic,linux-image-4.6.0-7-generic linux-image-virtual,linux-image-4.6.0-7-generic Dependencies: 4.6.0-7.8 - initramfs-tools (16 (null)) linux-initramfs-tool (0 (null)) kmod (0 (null)) grub-pc (16 (null)) grub-efi-amd64 (16 (null)) grub-efi-ia32 (16 (null)) grub (16 (null)) lilo (0 (null)) fdutils (0 (null)) linux-doc-4.6.0 (16 (null)) linux-source-4.6.0 (0 (null)) linux-tools (0 (null)) linux-headers-4.6.0-7-generic (0 (null)) Provides: 4.6.0-7.8 - zfs-dkms (= ) virtualbox-guest-modules (= ) spl-dkms (= ) redhat-cluster-modules (= ) linux-image (= ) kvm-api-4 (= ) ivtv-modules (= ) fuse-module (= ) Reverse Provides: ubuntu@yakkety:~$ Here the kernel has a 4.6.0-7 version number, not a 4.6.0-7.8 as you mentioned. Where do I get that kernel? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1590069 Title: vDSO syscalls don't work on yakkety/master-next (and unstable/master) Status in linux package in Ubuntu: Triaged Status in linux source package in Yakkety: Triaged Bug description: Hi guys, I'm having a problem where vDSO syscalls don't work on yakkety-next: dev:~ uname -a Linux dev 4.6.0-8-generic #9 SMP Mon Jun 6 14:21:30 MDT 2016 x86_64 x86_64 x86_64 GNU/Linux dev:~ cat tester.c #include <unistd.h> #include <stdio.h> #include <sys/time.h> int main() { struct timeval tv; struct timezone tz; while (1) { sleep(1); if (gettimeofday(&tv, &tz) < 0) { perror("gettimeofday"); } } return 0; } dev:~ make tester make: 'tester' is up to date. dev:~ strace tester strace: Can't stat 'tester': No such file or directory dev:~ 1 strace ./tester execve("./tester", ["./tester"], [/* 35 vars */]) = 0 brk(NULL) = 0x19e4000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbca234b000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=44113, ...}) = 0 mmap(NULL, 44113, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fbca2340000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1864888, ...}) = 0 mmap(NULL, 3967488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fbca1d5f000 mprotect(0x7fbca1f1f000, 2093056, PROT_NONE) = 0 mmap(0x7fbca211e000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bf000) = 0x7fbca211e000 mmap(0x7fbca2124000, 14848, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fbca2124000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbca233f000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbca233e000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbca233d000 arch_prctl(ARCH_SET_FS, 0x7fbca233e700) = 0 mprotect(0x7fbca211e000, 16384, PROT_READ) = 0 mprotect(0x600000, 4096, PROT_READ) = 0 mprotect(0x7fbca234d000, 4096, PROT_READ) = 0 munmap(0x7fbca2340000, 44113) = 0 nanosleep({1, 0}, 0x7fffc8ec71f0) = 0 gettimeofday({1465317034, 813437}, {tz_minuteswest=0, tz_dsttime=0}) = 0 nanosleep({1, 0}, 0x7fffc8ec71f0) = 0 gettimeofday({1465317035, 813718}, {tz_minuteswest=0, tz_dsttime=0}) = 0 nanosleep({1, 0}, 0x7fffc8ec71f0) = 0 gettimeofday({1465317036, 814008}, {tz_minuteswest=0, tz_dsttime=0}) = 0 nanosleep({1, 0}, ^Cstrace: Process 15793 detached <detached ...> whereas on a normal machine, they do: ~ uname -a Linux hopstrocity 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ~ cat tester.c #include <unistd.h> #include <stdio.h> #include <sys/time.h> int main() { struct timeval tv; struct timezone tz; while (1) { sleep(1); if (gettimeofday(&tv, &tz) < 0) { perror("gettimeofday"); } } return 0; } ~ make tester make: 'tester' is up to date. ~ strace ./tester execve("./tester", ["./tester"], [/* 60 vars */]) = 0 brk(NULL) = 0x12c7000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb544a9b000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=143083, ...}) = 0 mmap(NULL, 143083, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fb544a78000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1864888, ...}) = 0 mmap(NULL, 3967488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb5444af000 mprotect(0x7fb54466f000, 2093056, PROT_NONE) = 0 mmap(0x7fb54486e000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bf000) = 0x7fb54486e000 mmap(0x7fb544874000, 14848, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fb544874000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb544a77000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb544a76000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb544a75000 arch_prctl(ARCH_SET_FS, 0x7fb544a76700) = 0 mprotect(0x7fb54486e000, 16384, PROT_READ) = 0 mprotect(0x600000, 4096, PROT_READ) = 0 mprotect(0x7fb544a9d000, 4096, PROT_READ) = 0 munmap(0x7fb544a78000, 143083) = 0 nanosleep({1, 0}, 0x7fffb8b22f40) = 0 nanosleep({1, 0}, 0x7fffb8b22f40) = 0 nanosleep({1, 0}, 0x7fffb8b22f40) = 0 nanosleep({1, 0}, ^Cstrace: Process 16752 detached <detached ...> I suspect this is due to 3d26b8d8361a9cfa098fe8548f1836573925cc7d, but I'm not sure. 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