[Group.of.nepali.translators] [Bug 1873448] [NEW] stress-ng in xenial segfaults on dup stressor on arm64

[Colin Ian King]

Public bug reported:

Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
stress-ng: info:  [10979] defaulting to a 86400 second run per stressor
stress-ng: info:  [10979] dispatching hogs: 1 dup
stress-ng: info:  [10979] cache allocate: using built-in defaults as unable to 
determine cache details
stress-ng: info:  [10979] cache allocate: default cache size: 2048K
[New process 10982]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
65536 1048573

Thread 2.1 "stress-ng-dup" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xffffb7ff1000 (LWP 10982)]
0x00000000004191f0 in stress_dup (counter=0xffffb7cbee78, instance=<optimised 
out>, max_ops=0, name=<optimised out>)
    at stress-dup.c:63
63                              fds[i] = dup(fds[0]);

This requires a fix  from commit:

67d872611b860a79b03dca8c7549e5cee7fec4eb Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.k...@canonical.com>
Date: Tue, 8 Nov 2016 15:50:20 +0000
Subject: [PATCH] treewide: remove messy #if defined() build checks

diff --git a/stress-dup.c b/stress-dup.c
index 2fe2d6a6..0ac13fee 100644
--- a/stress-dup.c
+++ b/stress-dup.c
@@ -45,7 +45,7 @@ int stress_dup(
        const char *name)
 {
        int fds[STRESS_FD_MAX];
-       const size_t max_fd = stress_get_file_limit();
+       size_t max_fd = stress_get_file_limit();
        size_t i;
 #if defined(__linux__)
        bool do_dup3 = true;
@@ -53,6 +53,9 @@ int stress_dup(

        (void)instance;

+       if (max_fd > SIZEOF_ARRAY(fds))
+               max_fd =  SIZEOF_ARRAY(fds);
+
        fds[0] = open("/dev/zero", O_RDONLY);
        if (fds[0] < 0) {
                pr_fail_dbg(name, "open on /dev/zero");

** Affects: stress-ng (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: stress-ng (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Changed in: stress-ng
       Status: New => In Progress

** Changed in: stress-ng
   Importance: Undecided => Medium

** Changed in: stress-ng
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Also affects: stress-ng (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: stress-ng

** Also affects: stress-ng (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1873448

Title:
  stress-ng in xenial segfaults on dup stressor on arm64

Status in stress-ng package in Ubuntu:
  New
Status in stress-ng source package in Xenial:
  New

Bug description:
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  stress-ng: info:  [10979] defaulting to a 86400 second run per stressor
  stress-ng: info:  [10979] dispatching hogs: 1 dup
  stress-ng: info:  [10979] cache allocate: using built-in defaults as unable 
to determine cache details
  stress-ng: info:  [10979] cache allocate: default cache size: 2048K
  [New process 10982]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
  65536 1048573

  Thread 2.1 "stress-ng-dup" received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0xffffb7ff1000 (LWP 10982)]
  0x00000000004191f0 in stress_dup (counter=0xffffb7cbee78, instance=<optimised 
out>, max_ops=0, name=<optimised out>)
      at stress-dup.c:63
  63                            fds[i] = dup(fds[0]);

  This requires a fix  from commit:

  67d872611b860a79b03dca8c7549e5cee7fec4eb Mon Sep 17 00:00:00 2001
  From: Colin Ian King <colin.k...@canonical.com>
  Date: Tue, 8 Nov 2016 15:50:20 +0000
  Subject: [PATCH] treewide: remove messy #if defined() build checks

  diff --git a/stress-dup.c b/stress-dup.c
  index 2fe2d6a6..0ac13fee 100644
  --- a/stress-dup.c
  +++ b/stress-dup.c
  @@ -45,7 +45,7 @@ int stress_dup(
          const char *name)
   {
          int fds[STRESS_FD_MAX];
  -       const size_t max_fd = stress_get_file_limit();
  +       size_t max_fd = stress_get_file_limit();
          size_t i;
   #if defined(__linux__)
          bool do_dup3 = true;
  @@ -53,6 +53,9 @@ int stress_dup(

          (void)instance;

  +       if (max_fd > SIZEOF_ARRAY(fds))
  +               max_fd =  SIZEOF_ARRAY(fds);
  +
          fds[0] = open("/dev/zero", O_RDONLY);
          if (fds[0] < 0) {
                  pr_fail_dbg(name, "open on /dev/zero");

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