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Message #184078
[Bug 1590069] Re: vDSO syscalls don't work on yakkety/master-next (and unstable/master)
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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References
