Public bug reported:

Assigned to libfm, as this is definitely an internal core problem,
nothing visual.

I don't know what I did to trigger the bug, I think I just clicked on the next 
file in my folder and pcmanfm was no more.
BTW, please also note that the configuration file in Lubuntu is not found. 
(/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf)

Current only two VALID paths are:

/etc/xdg/pcmanfm/lubuntu/pcmanfm.conf

/etc/xdg/pcmanfm/default/pcmanfm.conf

Hopefully this report will give some deeper insight what was responsible
for this crash.

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: pcmanfm 1.2.3-1.1
ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
Uname: Linux 3.18.0-9-generic i686
ApportVersion: 2.16.1-0ubuntu2
Architecture: i386
Config_pcmanfm_System_Lubuntu: Error: [Errno 2] No such file or directory: 
'/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf'
CrashCounter: 1
CurrentDesktop: LXDE
Date: Wed Feb 11 23:15:18 2015
ExecutablePath: /usr/bin/pcmanfm
ProcCmdline: pcmanfm --desktop --profile lubuntu
SegvAnalysis:
 Segfault happened at: 0xb6d74de4 <fm_mime_type_ref+4>: lock addl 
$0x1,0x10(%eax)
 PC (0xb6d74de4) ok
 source "$0x1" ok
 destination "0x10(%eax)" (0x00000010) not located in a known VMA region 
(needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: pcmanfm
StacktraceTop:
 fm_mime_type_ref () from /usr/lib/i386-linux-gnu/libfm.so.4
 ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
 ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
 ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
 ffi_call_SYSV () from /usr/lib/i386-linux-gnu/libffi.so.6
Title: pcmanfm crashed with SIGSEGV in fm_mime_type_ref()
UpgradeStatus: Upgraded to vivid on 2014-12-30 (43 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: libfm (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: fedora
     Importance: Unknown
         Status: Unknown


** Tags: apport-crash gnome3-ppa i386 need-i386-retrace third-party-packages 
vivid

** Attachment removed: "Udisks_dump.txt"
   
https://bugs.launchpad.net/ubuntu/+source/pcmanfm/+bug/1420998/+attachment/4317526/+files/Udisks_dump.txt

** Package changed: pcmanfm (Ubuntu) => libfm (Ubuntu)

** Information type changed from Private to Public

** Description changed:

  Assigned to libfm, as this is definitely an internal core problem,
  nothing visual.
  
  I don't know what I did to trigger the bug, I think I just clicked on the 
next file in my folder and pcmanfm was no more.
- BTW, please also note that the configuration file in Lubuntu is not found. 
(....xdg... path)
+ BTW, please also note that the configuration file in Lubuntu is not found. 
(/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf)
+ 
+ Current only two VALID paths are:
+ 
+ /etc/xdg/pcmanfm/lubuntu/pcmanfm.conf
+ 
+ /etc/xdg/pcmanfm/default/pcmanfm.conf
  
  Hopefully this report will give some deeper insight what was responsible
  for this crash.
  
  ProblemType: Crash
  DistroRelease: Ubuntu 15.04
  Package: pcmanfm 1.2.3-1.1
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Uname: Linux 3.18.0-9-generic i686
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: i386
  Config_pcmanfm_System_Lubuntu: Error: [Errno 2] No such file or directory: 
'/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf'
  CrashCounter: 1
  CurrentDesktop: LXDE
  Date: Wed Feb 11 23:15:18 2015
  ExecutablePath: /usr/bin/pcmanfm
  ProcCmdline: pcmanfm --desktop --profile lubuntu
  SegvAnalysis:
-  Segfault happened at: 0xb6d74de4 <fm_mime_type_ref+4>:       lock addl 
$0x1,0x10(%eax)
-  PC (0xb6d74de4) ok
-  source "$0x1" ok
-  destination "0x10(%eax)" (0x00000010) not located in a known VMA region 
(needed writable region)!
+  Segfault happened at: 0xb6d74de4 <fm_mime_type_ref+4>:       lock addl 
$0x1,0x10(%eax)
+  PC (0xb6d74de4) ok
+  source "$0x1" ok
+  destination "0x10(%eax)" (0x00000010) not located in a known VMA region 
(needed writable region)!
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: pcmanfm
  StacktraceTop:
-  fm_mime_type_ref () from /usr/lib/i386-linux-gnu/libfm.so.4
-  ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
-  ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
-  ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
-  ffi_call_SYSV () from /usr/lib/i386-linux-gnu/libffi.so.6
+  fm_mime_type_ref () from /usr/lib/i386-linux-gnu/libfm.so.4
+  ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
+  ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
+  ?? () from /usr/lib/i386-linux-gnu/libfm.so.4
+  ffi_call_SYSV () from /usr/lib/i386-linux-gnu/libffi.so.6
  Title: pcmanfm crashed with SIGSEGV in fm_mime_type_ref()
  UpgradeStatus: Upgraded to vivid on 2014-12-30 (43 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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https://bugs.launchpad.net/bugs/1420998

Title:
  pcmanfm crashed with SIGSEGV in fm_mime_type_ref() (bug in libfm core)

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