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[Bug 1590069] [NEW] vDSO syscalls don't work on yakkety/master-next (and unstable/master)

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Tycho Andersen <tycho.andersen@xxxxxxxxxxxxx>
Date: Tue, 07 Jun 2016 16:33:02 -0000
Reply-to: Bug 1590069 <1590069@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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Follow ups

[Bug 1590069] Re: vDSO syscalls don't work on yakkety/master-next (and unstable/master)
From: Tycho Andersen, 2016-06-14
[Bug 1590069] Re: vDSO syscalls don't work on yakkety/master-next (and unstable/master)
From: Tim Gardner, 2016-06-07
[Bug 1590069] Re: vDSO syscalls don't work on yakkety/master-next (and unstable/master)
From: Tim Gardner, 2016-06-07
[Bug 1590069] Missing required logs.
From: Brad Figg, 2016-06-07
[Bug 1590069] Re: vDSO syscalls don't work on yakkety/master-next (and unstable/master)
From: Tycho Andersen, 2016-06-07