NetBSD Problem Report #56828

From wiz@yt.nih.at  Fri May 13 09:52:10 2022
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Date: Fri, 13 May 2022 11:34:16 +0200 (CEST)
From: Thomas Klausner <wiz@NetBSD.org>
Reply-To: Thomas Klausner <wiz@NetBSD.org>
To: gnats-bugs@NetBSD.org
Subject: futex calls in Linux emulation sometimes hang
X-Send-Pr-Version: 3.95

>Number:         56828
>Category:       kern
>Synopsis:       futex calls in Linux emulation sometimes hang
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 13 09:55:00 +0000 2022
>Last-Modified:  Sat Mar 25 05:45:01 +0000 2023
>Originator:     Thomas Klausner
>Release:        NetBSD 9.99.96
>Organization:

>Environment:


Architecture: x86_64
Machine: amd64
>Description:
I'm using a Java application running under Linux emulation.
It sometimes hangs and ps says it's in futex:

ps -alxwww | grep java

1000 20124 19935 581925  83  0 37599660 110892 futex   Sl+  ttyp7    0:02.57 /usr/pkg/java/oracle-8/bin/java -cp /usr/pkg/PDF-Over/lib/* at.asit.pdfover.gui.Main file.pdf

Usually I can CTRL-C and restart it, and about 1/3 or 1/5 of tries
I can finish what I want to do with it.

>How-To-Repeat:
Install PDF-Over by downloading
https://webstart.buergerkarte.at/PDF-Over/setup_pdf-over_linux.jar

Install it using oracle-jre8-8.0.202:

oracle8-java -jar setup_pdf-over_linux.jar

Run it, using some variant of

/usr/pkg/bin/oracle8-java -cp "/installation/path/PDF-Over/lib/*" at.asit.pdfover.gui.Main "$@"

on a PDF file.
Sometimes it hangs before displaying the first screen, i.e. it pops up
a new window but that window stays gray. If you get further than that, just
ctrl-c and try again.

>Fix:
Yes, please!

>Audit-Trail:
From: Thomas Klausner <wiz@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/56828: futex calls in Linux emulation sometimes hang
Date: Fri, 13 May 2022 18:08:48 +0200

 I'm told that this can also be reproduced in the following way:

 Using the Metalworks demo
 (/usr/pkg/java/openjdk8/demo/jfc/Metalworks/Metalworks.jar from the
 opendjk8 package):

 Start it, select the "About" dialog from the help menu and click the OK button.

 I forgot to mention that this wasn't working better on the
 thorpej-futex2 branch last I tried.
  Thomas

From: Thomas Klausner <wiz@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/56828: futex calls in Linux emulation sometimes hang
Date: Fri, 16 Sep 2022 14:05:07 +0200

 Some information from debugging with riastradh, OCR'd and handfixed:

 crash> ps/w | grep futex
 7203 8445 java linux 43 futex ffffa3212cc45ed0
 7203 8701 java linux 43 futex ffffa3212cc3eed0
 ...
 many many more of these.

 (gdb) p futex_tab
 $1 = (lock = {u = (mtxa_owner = 0, s = (mtxs_dummy = 0 '\000', mtxs_ipl = {_ipl = 0 '\000'}, mtxs_lock = 0 '\000', mtxs_unused = 0 '\000'}}}, va = {rbt_root = 0x0, rbt_ops = 0xffffffff81375ba0 <futex_rb_ops>,
 rbt_minmax = {0x0, 0x0}}, oa = {rbt_root = 0xffff8039324615a0, rbt_ops = 0xffffffff81375b80 <futex_shared_rb_ops>, rbt_minmax = {0xffff8035d9ac71e0, 0xffff8035fa7f0c60}}}
 (gdb) print ((struct futex_wait *) (0xffffa3212cc45ed0
 - (size_t)&((struct futex_wait *)0)->fw_cv))
 $2 = (struct futex wait *) 0xffffa3212cc45ec8
 (gd) print &((struct futex_wait *)0)->fw_cv
 $3 = (kcondvar t *) 0x8
 (gdb) print _Alignof (struct futex_wait)
 $4 = 8
 (gdb) print *((struct futex_wait *) (0xffffa3212cc45ed0 - (size_t)&((struct futex_wait *)0)->fw_cv))
 $5 = (fw lock = {u = {mtxa_owner = 0, s = {mtxs_dummy = 0 '\000', mtxs_ipl = { ipl = 0 '\000'}, mtxs_lock = 0 '\000', mtxs_unused = 0 '\000'}}}, fw_cv = {cv_opaque = 0xffff803897cb8100, 0xffffffff813e61a9}}, fw_futex = 0xffff803873cf9400, fw_entry = {tqe_next = 0x0, tqe_prev = 0xffff803873cf9440}, fw_abort = (le_next = 0xca, le_prev = 0xffffa3212cc45f407, fw_bitset=-1, fw_aborting = false}
 (gdb) x/s ((struct futex_wait *)(0xffffa3212cc45ed0 - (size_t)&((struct futex_wait *)0)->fw_cv))->fw_cv->cv_opaque[1]
 Oxffffffff813e61a9: "futex"
 (gdb) print *((struct futex_wait *)(0xffffa3212cceed0 - (size_t)&((struct futex_wait *)0)->fw_cv))
 $6 = {fw lock = {u = (mtxa_owner = 0, s = {mtxs_dummy = 0 '\000', mtxs_ipl = { ipl = 0 '\000'}, mtxs_lock = 0 '\000', mtxs_unused = 0 '\000'}}}, fw_cv = {cv_opaque = {0xffff80389a4d3940, 0xffffffff813e61a93}, fw_futex = 0xffff8038720bcac0, fw_entry = {tqe_next = 0x0, tqe_prev = 0xffff8038720bcb00}, fw_abort = {le_next = Oxffff8035da5d3100, le_prev = 0xffffa3212cc3ef307, fw_bitset = -1, fw_aborting = false }

From: Thomas Klausner <wiz@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/56828: futex calls in Linux emulation sometimes hang
Date: Sat, 25 Mar 2023 06:44:46 +0100

 I compiled
 https://github.com/linux-test-project/ltp/releases/download/20230127/ltp-full-20230127.tar.bz2
 on a CentOS (exact version unknown, sorry) and copied the contents of
 testcases/kernel/syscalls/futex (see
 https://github.com/linux-test-project/ltp/tree/master/testcases/kernel/syscalls/futex)
 to a NetBSD 10.99.2/amd64 system and ran them. The output shows quite
 a number of problems (look for 'failed' and 'broken' below):

 *** futex_cmp_requeue01 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_cmp_requeue01.c:194: TINFO: Testing variant: syscall with old kernel spec
 futex_cmp_requeue01.c:103: TINFO: Test 0: waiters: 10, wakes: 3, requeues: 7
 futex_cmp_requeue01.c:126: TINFO: futex_cmp_requeue() returned 3
 futex_cmp_requeue01.c:140: TINFO: children woken, futex0: 0, futex1: 7, spurious wakeups: 0
 futex_cmp_requeue01.c:180: TFAIL: woken up -4, expected range (3, 3)
 futex_cmp_requeue01.c:103: TINFO: Test 1: waiters: 10, wakes: 0, requeues: 10
 futex_cmp_requeue01.c:126: TINFO: futex_cmp_requeue() returned 0
 futex_cmp_requeue01.c:140: TINFO: children woken, futex0: 0, futex1: 10, spurious wakeups: 0
 futex_cmp_requeue01.c:180: TFAIL: woken up -10, expected range (0, 0)
 futex_cmp_requeue01.c:103: TINFO: Test 2: waiters: 10, wakes: 2, requeues: 6
 futex_cmp_requeue01.c:126: TINFO: futex_cmp_requeue() returned 2
 futex_cmp_requeue01.c:140: TINFO: children woken, futex0: 2, futex1: 6, spurious wakeups: 0
 futex_cmp_requeue01.c:180: TFAIL: woken up -4, expected range (2, 2)
 futex_cmp_requeue01.c:103: TINFO: Test 3: waiters: 100, wakes: 50, requeues: 50
 futex_cmp_requeue01.c:126: TINFO: futex_cmp_requeue() returned 50
 futex_cmp_requeue01.c:140: TINFO: children woken, futex0: 0, futex1: 50, spurious wakeups: 0
 futex_cmp_requeue01.c:180: TFAIL: woken up 0, expected range (50, 50)
 futex_cmp_requeue01.c:103: TINFO: Test 4: waiters: 100, wakes: 0, requeues: 70
 futex_cmp_requeue01.c:126: TINFO: futex_cmp_requeue() returned 0
 futex_cmp_requeue01.c:140: TINFO: children woken, futex0: 30, futex1: 70, spurious wakeups: 0
 futex_cmp_requeue01.c:180: TFAIL: woken up -70, expected range (0, 0)
 futex_cmp_requeue01.c:95: TBROK: fork() failed: EAGAIN/EWOULDBLOCK (11)
 tst_test.c:1606: TINFO: Killed the leftover descendant processes

 Summary:
 passed   0
 failed   5
 broken   1
 skipped  0
 warnings 0

 *** futex_cmp_requeue02 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_cmp_requeue02.c:71: TINFO: Testing variant: syscall with old kernel spec
 futex_cmp_requeue02.c:64: TPASS: futex_cmp_requeue() failed as expected: EINVAL (22)
 futex_cmp_requeue02.c:64: TPASS: futex_cmp_requeue() failed as expected: EINVAL (22)
 futex_cmp_requeue02.c:53: TFAIL: futex_cmp_requeue() succeeded unexpectedly

 HINT: You _MAY_ be missing kernel fixes:

 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fbe0e839d1e2

 HINT: You _MAY_ be vulnerable to CVE(s):

 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6927

 Summary:
 passed   2
 failed   1
 broken   0
 skipped  0
 warnings 0

 *** futex_wait01 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wait01.c:69: TINFO: Testing variant: syscall with old kernel spec
 futex_wait01.c:62: TPASS: futex_wait() passed: ETIMEDOUT (110)
 futex_wait01.c:62: TPASS: futex_wait() passed: EAGAIN/EWOULDBLOCK (11)
 futex_wait01.c:62: TPASS: futex_wait() passed: ETIMEDOUT (110)
 futex_wait01.c:62: TPASS: futex_wait() passed: EAGAIN/EWOULDBLOCK (11)

 Summary:
 passed   4
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_wait02 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wait02.c:66: TINFO: Testing variant: syscall with old kernel spec
 futex_wait02.c:59: TPASS: futex_wait() woken up

 Summary:
 passed   1
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_wait03 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wait03.c:63: TINFO: Testing variant: syscall with old kernel spec
 Test timeouted, sending SIGKILL!
 tst_test.c:1612: TINFO: If you are running on slow machine, try exporting LTP_TIMEOUT_MUL > 1
 tst_test.c:1614: TBROK: Test killed! (timeout?)

 Summary:
 passed   0
 failed   0
 broken   1
 skipped  0
 warnings 0

 *** futex_wait04 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wait04.c:50: TINFO: Testing variant: syscall with old kernel spec
 futex_wait04.c:39: TPASS: futex_wait() returned -1: EAGAIN/EWOULDBLOCK (11)

 Summary:
 passed   1
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_wait05 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 sh: systemd-detect-virt: not found
 tst_timer_test.c:357: TINFO: CLOCK_MONOTONIC resolution 69ns
 tst_timer_test.c:365: TINFO: prctl(PR_GET_TIMERSLACK) = -1, using 50us
 tst_test.c:1566: TINFO: Updating max runtime to 0h 00m 09s
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 39s
 tst_timer_test.c:379: TINFO: Failed to set zero latency constraint: No such file or directory
 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 1000us 500 iterations, threshold 450.01us
 tst_timer_test.c:285: TINFO: Found 500 outliners in [20033,10715] range
 tst_timer_test.c:305: TINFO: min 10715us, max 20033us, median 19998us, trunc mean 19811.95us (discarded 25)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
     10715 | *
     11206 |
     11697 |
     12188 | .
     12679 |
     13170 |
     13661 |
     14152 |
     14643 |
     15134 |
     15625 |
     16116 |
     16607 |
     17098 |
     17589 |
     18080 |
     18571 | +
     19062 | -
     19553 | ********************************************************************
 --------------------------------------------------------------------------------
     491us | 1 sample = 0.14108 '*', 0.28216 '+', 0.56432 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 2000us 500 iterations, threshold 450.01us
 tst_timer_test.c:285: TINFO: Found 11 outliners in [20014,20001] range
 tst_timer_test.c:305: TINFO: min 11091us, max 20014us, median 19998us, trunc mean 19963.34us (discarded 25)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
     11091 | .
     11561 |
     12031 |
     12501 |
     12971 |
     13441 |
     13911 | .
     14381 |
     14851 |
     15321 |
     15791 |
     16261 |
     16731 |
     17201 |
     17671 |
     18141 |
     18611 | .
     19081 |
     19551 | ********************************************************************
 --------------------------------------------------------------------------------
     470us | 1 sample = 0.13682 '*', 0.27364 '+', 0.54728 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 5000us 300 iterations, threshold 450.04us
 tst_timer_test.c:305: TINFO: min 19554us, max 20000us, median 19998us, trunc mean 19996.26us (discarded 15)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
     19554 | .
     19578 |
     19602 |
     19626 |
     19650 |
     19674 |
     19698 |
     19722 |
     19746 |
     19770 |
     19794 |
     19818 |
     19842 |
     19866 |
     19890 |
     19914 |
     19938 |
     19962 |
     19986 | ********************************************************************
 --------------------------------------------------------------------------------
      24us | 1 sample = 0.22742 '*', 0.45485 '+', 0.90970 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 10000us 100 iterations, threshold 450.33us
 tst_timer_test.c:305: TINFO: min 19678us, max 20001us, median 19998us, trunc mean 19994.49us (discarded 5)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
     19678 | +
     19695 |
     19712 |
     19729 |
     19746 |
     19763 |
     19780 |
     19797 |
     19814 |
     19831 |
     19848 |
     19865 |
     19882 |
     19899 |
     19916 |
     19933 |
     19950 |
     19967 |
     19984 | ********************************************************************
     20001 | +
 --------------------------------------------------------------------------------
      17us | 1 sample = 0.69388 '*', 1.38776 '+', 2.77551 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 25000us 50 iterations, threshold 451.29us
 tst_timer_test.c:305: TINFO: min 39713us, max 40000us, median 39998us, trunc mean 39992.19us (discarded 2)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
     39713 | *-
     39729 |
     39745 |
     39761 |
     39777 |
     39793 |
     39809 |
     39825 |
     39841 |
     39857 |
     39873 |
     39889 |
     39905 |
     39921 |
     39937 |
     39953 |
     39969 |
     39985 | ********************************************************************
 --------------------------------------------------------------------------------
      16us | 1 sample = 1.38776 '*', 2.77551 '+', 5.55102 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 100000us 10 iterations, threshold 537.00us
 tst_timer_test.c:305: TINFO: min 109716us, max 110001us, median 109999us, trunc mean 109967.78us (discarded 1)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
    109716 | ********+
    109731 |
    109746 |
    109761 |
    109776 |
    109791 |
    109806 |
    109821 |
    109836 |
    109851 |
    109866 |
    109881 |
    109896 |
    109911 |
    109926 |
    109941 |
    109956 |
    109971 |
    109986 | ********************************************************************
    110001 | ********+
 --------------------------------------------------------------------------------
      15us | 1 sample = 8.50000 '*', 17.00000 '+', 34.00000 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: futex_wait() sleeping for 1000000us 2 iterations, threshold 4400.00us
 tst_timer_test.c:305: TINFO: min 1009721us, max 1010012us, median 1009721us, trunc mean 1009721.00us (discarded 1)
 tst_timer_test.c:314: TFAIL: futex_wait() slept for too long

  Time: us | Frequency
 --------------------------------------------------------------------------------
   1009721 | ********************************************************************
   1009737 |
   1009753 |
   1009769 |
   1009785 |
   1009801 |
   1009817 |
   1009833 |
   1009849 |
   1009865 |
   1009881 |
   1009897 |
   1009913 |
   1009929 |
   1009945 |
   1009961 |
   1009977 |
   1009993 |
   1010009 | ********************************************************************
 --------------------------------------------------------------------------------
      16us | 1 sample = 68.00000 '*', 136.00000 '+', 272.00000 '-', non-zero '.'


 Summary:
 passed   0
 failed   7
 broken   0
 skipped  0
 warnings 0

 *** futex_wait_bitset01 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wait_bitset01.c:99: TINFO: Testing variant: syscall with old kernel spec
 futex_wait_bitset01.c:44: TINFO: testing futex_wait_bitset() timeout with CLOCK_MONOTONIC
 futex_wait_bitset01.c:86: TPASS: futex_wait_bitset() waited 114236us, expected 100010us
 futex_wait_bitset01.c:44: TINFO: testing futex_wait_bitset() timeout with CLOCK_REALTIME
 futex_wait_bitset01.c:86: TPASS: futex_wait_bitset() waited 119960us, expected 100010us

 Summary:
 passed   2
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_waitv01 ***

 tst_test.c:899: TCONF: The test requires kernel 5.16 or newer

 *** futex_waitv02 ***

 tst_test.c:899: TCONF: The test requires kernel 5.16 or newer

 *** futex_waitv03 ***

 tst_test.c:899: TCONF: The test requires kernel 5.16 or newer

 *** futex_wake01 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wake01.c:59: TINFO: Testing variant: syscall with old kernel spec
 futex_wake01.c:52: TPASS: futex_wake() passed
 futex_wake01.c:52: TPASS: futex_wake() passed
 futex_wake01.c:52: TPASS: futex_wake() passed
 futex_wake01.c:52: TPASS: futex_wake() passed
 futex_wake01.c:52: TPASS: futex_wake() passed
 futex_wake01.c:52: TPASS: futex_wake() passed

 Summary:
 passed   6
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_wake02 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wake02.c:134: TINFO: Testing variant: syscall with old kernel spec
 futex_utils.h:69: TINFO: 0 threads sleeping, expected 55
 futex_wake02.c:91: TPASS: futex_wake() woken up 1 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 2 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 3 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 4 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 5 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 6 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 7 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 8 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 9 threads
 futex_wake02.c:91: TPASS: futex_wake() woken up 10 threads
 futex_wake02.c:103: TPASS: futex_wake() woken up 0 threads

 Summary:
 passed   11
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_wake03 ***

 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
 tst_memutils.c:141: TINFO: oom_score_adj does not exist, skipping the adjustment
 futex_wake03.c:97: TINFO: Testing variant: syscall with old kernel spec
 futex_wake03.c:61: TPASS: futex_wake() woken up 1 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 2 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 3 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 4 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 5 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 6 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 7 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 8 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 9 childs
 futex_wake03.c:61: TPASS: futex_wake() woken up 10 childs
 futex_wake03.c:89: TPASS: futex_wake() woken up 0 children

 Summary:
 passed   11
 failed   0
 broken   0
 skipped  0
 warnings 0

 *** futex_wake04 ***

 tst_test.c:1152: TCONF: Test needs to be run as root


 Running the last as root just gives:

 tst_hugepage.c:34: TCONF: hugetlbfs is not supported

 Perhaps these are easier-to-debug cases?
  Thomas

>Unformatted:

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