[Bug 1573307] Re: wget crashed with SIGSEGV in __memset_avx2()

Fri Apr 22 00:52:24 UTC 2016

I've downloaded the source package and debugged it... this seems related to a bug that is being discussed on the wget
mailing list at the following url: http://lists.gnu.org/archive/html/bug-wget/2016-02/msg00033.html

They say this happens with a small terminal window... but on me it happens no matter how big the terminal is...
i've tried to run wget with "quiet" mode and also chanding the progress from "bar" to "dot" and it works ...
anyways this is the backtrace done with gdb and you can see the padding is negative. Hope it helps :-)

evan at HPPC:~/Scaricati/wget-1.17.1/src$ gdb --args ./wget http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso
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Reading symbols from ./wget...done.

(gdb) run
Starting program: /home/evan/Scaricati/wget-1.17.1/src/wget http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso
--2016-04-22 02:31:01--  http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso
Risoluzione di releases.ubuntu.com... 91.189.92.163, 2001:6b0:e:2018::1337
Connessione a releases.ubuntu.com|91.189.92.163|:80... connesso.
Richiesta HTTP inviata, in attesa di risposta... 302 Found
Posizione: http://d3f216qdpm0le3.cloudfront.net/ubuntu-16.04-desktop-amd64.iso [segue]
--2016-04-22 02:31:01--  http://d3f216qdpm0le3.cloudfront.net/ubuntu-16.04-desktop-amd64.iso
Risoluzione di d3f216qdpm0le3.cloudfront.net... 54.192.25.79, 54.192.25.232, 54.192.25.72, ...
Connessione a d3f216qdpm0le3.cloudfront.net|54.192.25.79|:80... connesso.
Richiesta HTTP inviata, in attesa di risposta... 200 OK
Lunghezza: 1485881344 (1,4G) [application/x-iso9660-image]
Salvataggio in: "ubuntu-16.04-desktop-amd64.iso.1"

ubuntu-16.04-desktop-amd64.iso.1             0%[                                                                                      ]   2,74M   996KB/s               
Program received signal SIGSEGV, Segmentation fault.
__memset_avx2 () at ../sysdeps/x86_64/multiarch/memset-avx2.S:161
161	../sysdeps/x86_64/multiarch/memset-avx2.S: File o directory non esistente.

(gdb) backtrace 
#0  __memset_avx2 () at ../sysdeps/x86_64/multiarch/memset-avx2.S:161
#1  0x0000000000431ac2 in create_image (bp=0x690220, dl_total_time=3,0172397000000002, done=false) at progress.c:1167
#2  0x0000000000430950 in bar_draw (progress=0x690220) at progress.c:658
#3  0x000000000042fd62 in progress_update (progress=0x690220, howmuch=1440, dltime=3,0172397000000002) at progress.c:188
#4  0x0000000000435689 in fd_read_body (downloaded_filename=0x688040 "ubuntu-16.04-desktop-amd64.iso.1", fd=4, out=0x68dfb0, toread=1485881344, startpos=0, 
    qtyread=0x7fffffffd940, qtywritten=0x7fffffffd8f0, elapsed=0x7fffffffd948, flags=1, out2=0x0) at retr.c:417
#5  0x0000000000421761 in read_response_body (hs=0x7fffffffd8f0, sock=4, fp=0x68dfb0, contlen=1485881344, contrange=0, chunked_transfer_encoding=false, 
    url=0x68d630 "http://d3f216qdpm0le3.cloudfront.net/ubuntu-16.04-desktop-amd64.iso", warc_timestamp_str=0x7fffffffd5d0 "]", warc_request_uuid=0x7fffffffd5f0 "Y", 
    warc_ip=0x0, type=0x68ce70 "application/x-iso9660-image", statcode=200, 
    head=0x68cb80 "HTTP/1.1 200 OK\r\nContent-Type: application/x-iso9660-image\r\nContent-Length: 1485881344\r\nConnection: keep-alive\r\nDate: Thu, 21 Apr 2016 13:53:05 GMT\r\nCache-Control: public,max-age=259200\r\nLast-Modified"...) at http.c:1682
#6  0x0000000000425c39 in gethttp (u=0x687fd0, hs=0x7fffffffd8f0, dt=0x7fffffffdcc8, proxy=0x0, iri=0x6863c0 <dummy_iri>, count=1) at http.c:3753
#7  0x0000000000426378 in http_loop (u=0x687fd0, original_url=0x687c80, newloc=0x7fffffffdbb8, local_file=0x7fffffffdbc0, referer=0x0, dt=0x7fffffffdcc8, proxy=0x0, 
    iri=0x6863c0 <dummy_iri>) at http.c:3971
#8  0x000000000043608b in retrieve_url (orig_parsed=0x687c80, origurl=0x6885e0 "http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso", file=0x7fffffffdcf8, 
    newloc=0x7fffffffdd00, refurl=0x0, dt=0x7fffffffdcc8, recursive=false, iri=0x6863c0 <dummy_iri>, register_status=true) at retr.c:817
#9  0x000000000042ecd6 in main (argc=2, argv=0x7fffffffdf28) at main.c:1868

(gdb) frame 1
#1  0x0000000000431ac2 in create_image (bp=0x690220, dl_total_time=3,0172397000000002, done=false) at progress.c:1167
1167	  memset (p, ' ', padding);

(gdb) print p
$1 = 0x690499 ' ' <repeats 200 times>...

(gdb) print padding
$2 = -1

(gdb)

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https://bugs.launchpad.net/bugs/1573307

Title:
  wget crashed with SIGSEGV in __memset_avx2()

Status in wget package in Ubuntu:
  New

Bug description:
  When I try to download a big file with wget on Ubuntu 16.04 it crashes
  after a couple seconds.

  To reproduce the bug try the following:

  wget http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso

  I've asked another guy on IRC on channel #ubuntu-it to try and reproduce this bug
  and he said it was crashing also on his machine.

  evan at HPPC:~$ lsb_release -rd
  Description:	Ubuntu 16.04 LTS
  Release:	16.04

  evan at HPPC:~$ apt-cache policy wget
  wget:
    Installato: 1.17.1-1ubuntu1
    Candidato:  1.17.1-1ubuntu1
    Tabella versione:
   *** 1.17.1-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: wget 1.17.1-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Apr 22 01:34:10 2016
  ExecutablePath: /usr/bin/wget
  InstallationDate: Installed on 2016-04-21 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcCmdline: wget http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso
  SegvAnalysis:
   Segfault happened at: 0x7f4eac3b7328 <__memset_avx2+392>:	rep stos %al,%es:(%rdi)
   PC (0x7f4eac3b7328) ok
   source "%al" ok
   destination "%es:(%rdi)" (0x562969134000) not located in a known VMA region (needed writable region)!
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: wget
  StacktraceTop:
   __memset_avx2 () at ../sysdeps/x86_64/multiarch/memset-avx2.S:161
   ?? ()
   ?? ()
   ?? ()
   ?? ()
  Title: wget crashed with SIGSEGV in __memset_avx2()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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