[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Apparently so, rerunning apt update && apt dist-upgrade now shows the
update.

 $ apt-cache show autofs | grep -i version
Version: 5.1.2-1ubuntu3
 style automounter under Linux. A recent version of the kernel

 $ automount -V

Linux automount version 5.1.2

Directories:
config dir: /etc/default
maps dir:   /etc
modules dir:/usr/lib/x86_64-linux-gnu/autofs

Compile options:
  DISABLE_MOUNT_LOCKING ENABLE_FORCED_SHUTDOWN ENABLE_IGNORE_BUSY_MOUNTS 
  WITH_HESIOD WITH_LDAP WITH_SASL LIBXML2_WORKAROUND 

Nfs automount no longer crashes when using -net. Awesome. Thanks

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

Maybe your mirror is lagging behind a bit. I already see it in the .br mirror:
  Version table:
 5.1.2-1ubuntu3 500
500 http://ubuntu.c3sl.ufpr.br/ubuntu bionic/main amd64 Packages

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

Maybe your mirror is lagging behind a bit. I already see it in the .br mirror:
  Version table:
 5.1.2-1ubuntu3 500
500 http://ubuntu.c3sl.ufpr.br/ubuntu bionic/main amd64 Packages

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

How do I get and test this update?  Running apt update and apt-cache
show autofs still shows Version: 5.1.2-1ubuntu2

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Thanks for the quick response.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Launchpad Bug Tracker]

This bug was fixed in the package autofs - 5.1.2-1ubuntu3

---
autofs (5.1.2-1ubuntu3) bionic; urgency=medium

  * Revert the previous change, as it introduced a segfault when using the
builtin -hosts map. This will reopen #1101779. (LP: #1745817)

 -- Andreas Hasenack   Fri, 13 Apr 2018 16:29:51
-0300

** Changed in: autofs (Ubuntu)
   Status: In Progress => Fix Released

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

For release team members looking at this bug, the attached MP has a
simple test case that reproduces the segfault and shows that the fixed
package does not crash.

** Merge proposal linked:
   
https://code.launchpad.net/~ahasenack/ubuntu/+source/autofs/+git/autofs/+merge/343237

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

For release team members looking at this bug, the attached MP has a
simple test case that reproduces the segfault and shows that the fixed
package does not crash.

** Merge proposal linked:
   
https://code.launchpad.net/~ahasenack/ubuntu/+source/autofs/+git/autofs/+merge/343237

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

** Changed in: autofs (Ubuntu)
 Assignee: (unassigned) => Andreas Hasenack (ahasenack)

** Changed in: autofs (Ubuntu)
   Importance: Undecided => High

** Changed in: autofs (Ubuntu)
   Status: Confirmed => In Progress

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

** Changed in: autofs (Ubuntu)
 Assignee: (unassigned) => Andreas Hasenack (ahasenack)

** Changed in: autofs (Ubuntu)
   Importance: Undecided => High

** Changed in: autofs (Ubuntu)
   Status: Confirmed => In Progress

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

I'm out of ideas. We can't upgrade libtirpc to 1.0.3 for Bionic I'm
afraid, so it looks like reverting the linking with libtirpc (and
reopening #1101779) is the only option for now.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

I'm out of ideas. We can't upgrade libtirpc to 1.0.3 for Bionic I'm
afraid, so it looks like reverting the linking with libtirpc (and
reopening #1101779) is the only option for now.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

It works if I build autofs with libtirpc 1.0.3, so the bug must have
been fixed between the ancient version ubuntu is carrying, and 1.0.3.
Debian has 1.0.2 in experimental.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

It works if I build autofs with libtirpc 1.0.3, so the bug must have
been fixed between the ancient version ubuntu is carrying, and 1.0.3.
Debian has 1.0.2 in experimental.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

What I got so far:

a) Using "/net /etc/auto.net -intr,soft --timeout=60" works around it
b) The crash is in AUTH_WRAP(cl->cl_auth, xdrs, xargs, argsp):


367 if ((! XDR_PUTINT32(xdrs, (int32_t *))) ||
368 (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
369 (! AUTH_WRAP(cl->cl_auth, xdrs, xargs, argsp))) {
370 cu->cu_error.re_status = RPC_CANTENCODEARGS;
371 goto out;
372 }

For some reason, the ah_wrap and ah_unwrap functions are not set:
(gdb) p *cl->cl_auth->ah_ops
$21 = {ah_nextverf = 0x77354e50 , ah_marshal = 
0x77354e60 , ah_validate = 0x77355090 
, ah_refresh = 0x77354ed0 , 
  ah_destroy = 0x77354e80 , ah_wrap = 0x0, ah_unwrap = 
0x0}

AUTH_WRAP() in particular wants ah_wrap.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

What I got so far:

a) Using "/net /etc/auto.net -intr,soft --timeout=60" works around it
b) The crash is in AUTH_WRAP(cl->cl_auth, xdrs, xargs, argsp):


367 if ((! XDR_PUTINT32(xdrs, (int32_t *))) ||
368 (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
369 (! AUTH_WRAP(cl->cl_auth, xdrs, xargs, argsp))) {
370 cu->cu_error.re_status = RPC_CANTENCODEARGS;
371 goto out;
372 }

For some reason, the ah_wrap and ah_unwrap functions are not set:
(gdb) p *cl->cl_auth->ah_ops
$21 = {ah_nextverf = 0x77354e50 , ah_marshal = 
0x77354e60 , ah_validate = 0x77355090 
, ah_refresh = 0x77354ed0 , 
  ah_destroy = 0x77354e80 , ah_wrap = 0x0, ah_unwrap = 
0x0}

AUTH_WRAP() in particular wants ah_wrap.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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Re: [Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Sounds good.  Let me know if there is more information I can get out of
gdb.

On Fri, Apr 13, 2018 at 8:14 AM, Andreas Hasenack 
wrote:

> Thanks for the troubleshooting. I'm taking a look.
>
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> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1745817
>
> Title:
>   autofs 5.1.2-1ubuntu2 crashes on nfs mount
>
> Status in autofs package in Ubuntu:
>   Confirmed
>
> Bug description:
>   Using the latest autofs package (with libtirpc support) the automount
>   process crashes when mounting a nfs share (at least when using IPv4).
>
>   I am using a file /etc/auto.master.d/net.autofs to be able to mount
>   arbitrary nfs shares to /net:
>
>   /net-hosts -intr,soft --timeout=60
>
>   When trying to access a share (e.g. with the command "cd
>   /net/192.168.1.104" - using the hostname has the same effect)
>   automount crashes:
>
>   $ sudo systemctl stop autofs.service
>   $ source /etc/default/autofs
>   $ sudo gdb --args /usr/sbin/automount $OPTIONS -d -v -f
>   (gdb) run
>   [...]
>   attempting to mount entry /net/192.168.1.104
>   lookup_mount: lookup(hosts): 192.168.1.104 -> (null)
>   get_exports: lookup(hosts): fetchng export list for 192.168.1.104
>
>   Thread 6 "automount" received signal SIGSEGV, Segmentation fault.
>   [Switching to Thread 0x77fc7700 (LWP 4640)]
>   0x in ?? ()
>   (gdb) bt
>   #0  0x in ?? ()
>   #1  0x7435b8dc in ?? () from /lib/x86_64-linux-gnu/libtirpc.so.1
>   #2  0x729b11ec in ?? () from /usr/lib/x86_64-linux-gnu/
> autofs/lookup_hosts.so
>   #3  0x729b23fa in rpc_get_exports () from
> /usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
>   #4  0x729ad516 in ?? () from /usr/lib/x86_64-linux-gnu/
> autofs/lookup_hosts.so
>   #5  0x729ae013 in lookup_mount () from /usr/lib/x86_64-linux-gnu/
> autofs/lookup_hosts.so
>   #6  0x5556c70d in do_lookup_mount ()
>   #7  0x5556d441 in lookup_nss_mount ()
>   #8  0x555634d5 in ?? ()
>   #9  0x77bbd7fc in start_thread () from /lib/x86_64-linux-gnu/
> libpthread.so.0
>   #10 0x77325b0f in clone () from /lib/x86_64-linux-gnu/libc.so.6
>
>   The segfault disappears if the autofs package is recompiled without
>   "--with-libtirpc" in debian/rules.
>
>   $ lsb_release -rd
>   Description:  Ubuntu Bionic Beaver (development branch)
>   Release:  18.04
>
>   $ apt-cache policy autofs
>   autofs:
> Installiert:   5.1.2-1ubuntu2
> Installationskandidat: 5.1.2-1ubuntu2
> Versionstabelle:
>*** 5.1.2-1ubuntu2 500
>   500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64
> Packages
>   100 /var/lib/dpkg/status
>
>   $ apt-cache policy libtirpc1
>   libtirpc1:
> Installiert:   0.2.5-1.2
> Installationskandidat: 0.2.5-1.2
> Versionstabelle:
>*** 0.2.5-1.2 500
>   500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64
> Packages
>   100 /var/lib/dpkg/status
>
>   BTW: libtirpc1 seems to be quite old in Ubuntu, the current release is
>   1.0.2
>
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> https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/
> 1745817/+subscriptions
>

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

Thanks for the troubleshooting. I'm taking a look.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Andreas Hasenack]

Thanks for the troubleshooting. I'm taking a look.

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[ChristianEhrhardt]

** Tags added: server-next

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Tested building autofs without --with-libtirpc and segfault went away.

 $ mkdir build
 $ cd build/
 $ sudo apt install flex bison build-essential autoconf debhelper
 $ sudo apt-get build-dep autofs
 $ apt-get source autofs
 $ cd autofs-5.1.2/
 $ dpkg-buildpackage -rfakeroot -b
 $ sed 's/--with-libtirpc//' debian/rules -i
 $ dpkg-buildpackage -rfakeroot -b
 $ mkdir INSTALL
 $ make DESTDIR=$PWD/INSTALL install
 $ mkdir ../system_lib/
 $ sudo mv /usr/lib/x86_64-linux-gnu/autofs/* ../system_lib/
 $ sudo mv INSTALL/usr/lib/x86_64-linux-gnu/autofs/* 
/usr/lib/x86_64-linux-gnu/autofs/

 $ sudo INSTALL/usr/sbin/automount --pid-file /var/run/autofs.pid -f -d
 $ ls /net/wanda  # Mounted and No crash

 $ sudo automount --pid-file /var/run/autofs.pid -f -d
 $ ls /net/wanda  # Mounted and No crash

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  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Adding ahasenack as he was the one assigned to the above issue.

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Linked to this change.
https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/1101779

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

Note the libtirpc version appears to be 1.0.10 and not 0.2.5-1.2

 $ ll /lib/x86_64-linux-gnu/libtirpc.so.1
lrwxrwxrwx 1 root root 18 May  5  2017 /lib/x86_64-linux-gnu/libtirpc.so.1 -> 
libtirpc.so.1.0.10
 $ file /lib/x86_64-linux-gnu/libtirpc.so.1.0.10 
/lib/x86_64-linux-gnu/libtirpc.so.1.0.10: ELF 64-bit LSB shared object, x86-64, 
version 1 (SYSV), dynamically linked, 
BuildID[sha1]=539908bd2e69d701d81bc12577b1532e4964a8f4, stripped

Although the latest version here appears to be 1.0.3
https://sourceforge.net/projects/libtirpc/files/libtirpc/

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Jonathan]

$ sudo gdb --args /usr/sbin/automount $OPTIONS -d -v -f

(gdb) run
Starting program: /usr/sbin/automount -d -v -f  
[...]
attempting to mount entry /net/wanda
lookup_mount: lookup(hosts): wanda -> (null)
 
get_exports: lookup(hosts): fetchng export list for wanda   
 

 
Thread 6 "automount" received signal SIGSEGV, Segmentation fault.   
 
[Switching to Thread 0x77fc8700 (LWP 13530)]
 
0x in ?? () 
 
(gdb) bt
 
#0  0x in ?? () 
 
#1  0x742fb8dc in ?? () from /lib/x86_64-linux-gnu/libtirpc.so.1
 
#2  0x718b01ec in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so 
#3  0x718b13fa in rpc_get_exports () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#4  0x718ac516 in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#5  0x718ad013 in lookup_mount () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#6  0x5556c70d in do_lookup_mount ()
#7  0x5556d441 in lookup_nss_mount ()
#8  0x555634d5 in ?? ()
#9  0x77bbd6db in start_thread (arg=0x77fc8700) at 
pthread_create.c:463
#10 0x7732188f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)
#0  0x in ?? ()
#1  0x742fb8dc in ?? () from /lib/x86_64-linux-gnu/libtirpc.so.1
#2  0x718b01ec in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#3  0x718b13fa in rpc_get_exports () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#4  0x718ac516 in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#5  0x718ad013 in lookup_mount () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#6  0x5556c70d in do_lookup_mount ()
#7  0x5556d441 in lookup_nss_mount ()
#8  0x555634d5 in ?? ()
#9  0x77bbd6db in start_thread (arg=0x77fc8700) at 
pthread_create.c:463
#10 0x7732188f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

 $ lsb_release -rd
Description:Ubuntu Bionic Beaver (development branch)
Release:18.04

Beta2

Package versions are the same as well.

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Title:
  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: autofs (Ubuntu)
   Status: New => Confirmed

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Title:
  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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[Bug 1745817] Re: autofs 5.1.2-1ubuntu2 crashes on nfs mount

[CKone]

here same on bionic server

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Title:
  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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