GNU logs - #77613, boring messages

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Subject: bug#77613: grep-3.11.69-a4628 on GNU/Hurd
Resent-From: Bruno Haible <bruno@HIDDEN>
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Date: Mon, 07 Apr 2025 19:33:00 +0200
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On
  - GNU/Hurd x86_64 from 2024,
  - GNU/Hurd i386 from 2023,
I see a test hang: hash-collision-perf.

On GNU/Hurd x86_64:

When I interrupted the build, the file 'in' has 5120000 lines, and
find attached the log file of this test. As you can see, the value of
small_ms stays 0 even for larger files.

By running
  $ date; LC_ALL=C ../../src/grep --file=in empty; date
I can see that the execution times grow like this:
  640000  0.3 sec
 1280000  0.9 sec
 2560000  1.5 sec
 5120000  > 60 sec

On GNU/Hurd i386, it's similar. Here it's when the file 'in' has
40960000 lines, that the grep execution hangs. Find attached the
last stack trace I was able to obtain before it hung.

Regardless how much RAM I give to the machine, there will always
be a point where "grep --file=in empty" will take more RAM than
available, and (since Hurd does not have an OOM killer) the machine
then hangs.

IMO, the correct behaviour would be that 'grep' exits via xalloc_die(),
not that it hangs.

Whereas on GNU/Linux (in a machine that has the same amount of RAM as
the GNU/Hurd machine):

  $ : > empty
  $ seq 640000 > in; LC_ALL=C time ./src/grep --file=in empty
  real 0.44s
  $ seq 1280000 > in; LC_ALL=C time ./src/grep --file=in empty
  real 0.99s
  $ seq 2560000 > in; LC_ALL=C time ./src/grep --file=in empty
  real 2.22s
  $ seq 5120000 > in; LC_ALL=C time ./src/grep --file=in empty
  real 4.84s
  $ seq 10240000 > in; LC_ALL=C time ./src/grep --file=in empty
  real 24.19s
  $ seq 20480000 > in; LC_ALL=C time ./src/grep --file=in empty
  Killed
  real 24.40s

Here it was the OOM killer that saved the machine from hanging.

So, IMO, there are two bugs:

  1) When the allocation of the kwset takes more memory than available,
     'grep' should exit via xalloc_die(), instead of waiting to be killed
     by the OOM killer.

  2) In the 'hash-collision-perf' unit test: The use of a perl primitive
     for measuring the execution time of a child process, that is not
     properly ported to GNU/Hurd.

Bruno

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Content-Disposition: attachment; filename="hash-collision-perf.log"
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Content-Type: text/x-log; charset="x-UTF_8J"; name="hash-collision-perf.log"

++ initial_cwd_=/home/bruno/grep-3.11.69-a4628/build/tests
+++ testdir_prefix_
+++ printf gt
++ pfx_=gt
+++ mktempd_ /home/bruno/grep-3.11.69-a4628/build/tests gt-hash-collision-perf.XXXX
+++ case $# in
+++ destdir_=/home/bruno/grep-3.11.69-a4628/build/tests
+++ template_=gt-hash-collision-perf.XXXX
+++ MAX_TRIES_=4
+++ case $destdir_ in
+++ destdir_slash_=/home/bruno/grep-3.11.69-a4628/build/tests/
+++ case $template_ in
++++ unset TMPDIR
+++ d=/home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
+++ case $d in
+++ :
+++ test -d /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
++++ ls -dgo /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
+++ perms='drwx------ 2 4096 Apr  7 15:55 /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE'
+++ case $perms in
+++ :
+++ echo /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
+++ return
++ test_dir_=/home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
++ cd /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
++ case $srcdir in
++ srcdir=../../../tests
++ builddir=..
++ export srcdir builddir
++ gl_init_sh_nl_='
'
++ IFS=' 	
'
++ for sig_ in 1 2 3 13 15
+++ expr 1 + 128
++ eval 'trap '\''Exit 129'\'' 1'
+++ trap 'Exit 129' 1
++ for sig_ in 1 2 3 13 15
+++ expr 2 + 128
++ eval 'trap '\''Exit 130'\'' 2'
+++ trap 'Exit 130' 2
++ for sig_ in 1 2 3 13 15
+++ expr 3 + 128
++ eval 'trap '\''Exit 131'\'' 3'
+++ trap 'Exit 131' 3
++ for sig_ in 1 2 3 13 15
+++ expr 13 + 128
++ eval 'trap '\''Exit 141'\'' 13'
+++ trap 'Exit 141' 13
++ for sig_ in 1 2 3 13 15
+++ expr 15 + 128
++ eval 'trap '\''Exit 143'\'' 15'
+++ trap 'Exit 143' 15
++ saved_IFS=' 	
'
++ IFS=:
++ new_PATH=
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ test -d /home/bruno/grep-3.11.69-a4628/build/src/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ test -d /usr/local/bin/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ test -d /usr/bin/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ test -d /bin/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ test -d /usr/local/games/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games
++ for dir in $PATH
++ IFS=' 	
'
++ case "$dir" in
++ test -d /usr/games/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
++ IFS=' 	
'
++ PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
++ export PATH
++ trap remove_tmp_ EXIT
+ path_prepend_ ../src
+ test 1 '!=' 0
+ path_dir_=../src
+ case $path_dir_ in
+ abs_path_dir_=/home/bruno/grep-3.11.69-a4628/build/tests/../src
+ case $abs_path_dir_ in
+ PATH=/home/bruno/grep-3.11.69-a4628/build/tests/../src:/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+ create_exe_shims_ /home/bruno/grep-3.11.69-a4628/build/tests/../src
+ case $EXEEXT in
+ return 0
+ shift
+ test 0 '!=' 0
+ export PATH
+ fail=0
+ require_perl_
+ test perl
+ perl -e 'use warnings'
+ :
+ n_pat=40000
+ :
+ seq 40000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 40000 '*' 2
+ n_pat=80000
+ :
+ seq 80000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 80000 '*' 2
+ n_pat=160000
+ :
+ seq 160000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 160000 '*' 2
+ n_pat=320000
+ :
+ seq 320000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 320000 '*' 2
+ n_pat=640000
+ :
+ seq 640000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 640000 '*' 2
+ n_pat=1280000
+ :
+ seq 1280000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 1280000 '*' 2
+ n_pat=2560000
+ :
+ seq 2560000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
    my $expected_exit_status = $ARGV[0];
    shift @ARGV;

    system (@ARGV);
    my ($user, $system, $child_user, $child_system) = times;

    my $me = q(hash-collision-perf);
    $? == -1
      and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
    my $rc = $?;
    my $sig = ($rc & 127);
    $sig and die "$me: child died with signal $sig\n";
    $rc >>= 8;
    $rc == $expected_exit_status
      or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";

    # Print milliseconds of child user time.
    $child_user *= 1000;
    print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 2560000 '*' 2
+ n_pat=5120000
+ :
+ seq 5120000

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Subject: bug#77613: Acknowledgement (grep-3.11.69-a4628 on GNU/Hurd)
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Subject: bug#77613: grep-3.11.69-a4628 on GNU/Hurd
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On Mon, Apr 7, 2025 at 10:34=E2=80=AFAM Bruno Haible via Bug reports for GN=
U
grep <bug-grep@HIDDEN> wrote:
> On
>   - GNU/Hurd x86_64 from 2024,
>   - GNU/Hurd i386 from 2023,
> I see a test hang: hash-collision-perf.
>
> On GNU/Hurd x86_64:
>
> When I interrupted the build, the file 'in' has 5120000 lines, and
> find attached the log file of this test. As you can see, the value of
> small_ms stays 0 even for larger files.
>
> By running
>   $ date; LC_ALL=3DC ../../src/grep --file=3Din empty; date
> I can see that the execution times grow like this:
>   640000  0.3 sec
>  1280000  0.9 sec
>  2560000  1.5 sec
>  5120000  > 60 sec
>
> On GNU/Hurd i386, it's similar. Here it's when the file 'in' has
> 40960000 lines, that the grep execution hangs. Find attached the
> last stack trace I was able to obtain before it hung.
>
> Regardless how much RAM I give to the machine, there will always
> be a point where "grep --file=3Din empty" will take more RAM than
> available, and (since Hurd does not have an OOM killer) the machine
> then hangs.
>
> IMO, the correct behaviour would be that 'grep' exits via xalloc_die(),
> not that it hangs.
>
> Whereas on GNU/Linux (in a machine that has the same amount of RAM as
> the GNU/Hurd machine):
>
>   $ : > empty
>   $ seq 640000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty
>   real 0.44s
>   $ seq 1280000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty
>   real 0.99s
>   $ seq 2560000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty
>   real 2.22s
>   $ seq 5120000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty
>   real 4.84s
>   $ seq 10240000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty
>   real 24.19s
>   $ seq 20480000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty
>   Killed
>   real 24.40s
>
> Here it was the OOM killer that saved the machine from hanging.
>
> So, IMO, there are two bugs:
>
>   1) When the allocation of the kwset takes more memory than available,
>      'grep' should exit via xalloc_die(), instead of waiting to be killed
>      by the OOM killer.
>
>   2) In the 'hash-collision-perf' unit test: The use of a perl primitive
>      for measuring the execution time of a child process, that is not
>      properly ported to GNU/Hurd.

Thanks for reporting that!
Adding a timeout should resolve this. Expect to push tomorrow:

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Subject: bug#77613: grep-3.11.69-a4628 on GNU/Hurd
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Hi Jim,

> > So, IMO, there are two bugs:
> >
> >   1) When the allocation of the kwset takes more memory than available,
> >      'grep' should exit via xalloc_die(), instead of waiting to be killed
> >      by the OOM killer.
> >
> >   2) In the 'hash-collision-perf' unit test: The use of a perl primitive
> >      for measuring the execution time of a child process, that is not
> >      properly ported to GNU/Hurd.
> 
> Thanks for reporting that!
> Adding a timeout should resolve this. Expect to push tomorrow:

No, it does not resolve the problem.

In both of my Hurd machines, with the patch, the 'hash-collision-perf'
unit test is still running after 20 minutes.
In the Hurd (32-bit) machine, a 'grep --file=in empty' command crashed from
signal 6 (SIGABRT); see attached screenshot.
Both machines are unresponsive and need to be rebooted.

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Subject: bug#77613: grep-3.11.69-a4628 on GNU/Hurd
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From: Jim Meyering <jim@HIDDEN>
Date: Tue, 8 Apr 2025 07:26:40 -0700
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On Tue, Apr 8, 2025 at 12:54=E2=80=AFAM Bruno Haible <bruno@HIDDEN> wrot=
e:
> Hi Jim,
>
> > > So, IMO, there are two bugs:
> > >
> > >   1) When the allocation of the kwset takes more memory than availabl=
e,
> > >      'grep' should exit via xalloc_die(), instead of waiting to be ki=
lled
> > >      by the OOM killer.
> > >
> > >   2) In the 'hash-collision-perf' unit test: The use of a perl primit=
ive
> > >      for measuring the execution time of a child process, that is not
> > >      properly ported to GNU/Hurd.
> >
> > Thanks for reporting that!
> > Adding a timeout should resolve this. Expect to push tomorrow:
>
> No, it does not resolve the problem.
>
> In both of my Hurd machines, with the patch, the 'hash-collision-perf'
> unit test is still running after 20 minutes.
> In the Hurd (32-bit) machine, a 'grep --file=3Din empty' command crashed =
from
> signal 6 (SIGABRT); see attached screenshot.
> Both machines are unresponsive and need to be rebooted.

Oh! Sorry. I made only the final invocation use the timeout. Must use
it in the loop, too.
Here's a better patch:

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