[Moosefs-users] Core Dumped from mfsmount with Autofs

[Flow J. <fl...@gm...>]

Hi,

After merging moosefs into our production environment for about 2 weeks, 
I now found there are a lot of core files dumped from mfsmount and 
remaining in "/" directory. All the back traces look simulator, which 
dies at free(freecblockshead) call in write_data_term (), when 
mainloop() ends.

Fedora 12 x64 (mfsmount is compiled from source):

Core was generated by `mfsmount /home/fwjiang -o 
rw,mfssubfolder=UserHome/fwjiang'.
Program terminated with signal 6, Aborted.
#0  0x00000039ab4327f5 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install 
fuse-libs-2.8.5-2.fc12.x86_64 glibc-2.11.2-3.x86_64 
libgcc-4.4.4-10.fc12.x86_64
(gdb) bt
#0  0x00000039ab4327f5 in raise () from /lib64/libc.so.6
#1  0x00000039ab433fd5 in abort () from /lib64/libc.so.6
#2  0x00000039ab46fa1b in __libc_message () from /lib64/libc.so.6
#3  0x00000039ab475336 in malloc_printerr () from /lib64/libc.so.6
#4  0x000000000040eb12 in write_data_term () at writedata.c:906
#5  0x000000000041282d in mainloop (args=0x7fff49f484d0, mp=0x1bb72e0 
"/tmp/autotAfzu1", mt=1, fg=0) at main.c:599
#6  0x0000000000412c48 in main (argc=<value optimized out>, 
argv=0x7fff49f485f8) at main.c:819

Centos 5.5 x86 (mfsmount is from DAG repository):

Core was generated by `mfsmount /project/ui -o 
rw,mfssubfolder=ProjectData/project/ui'.
Program terminated with signal 6, Aborted.
#0  0x00417410 in __kernel_vsyscall ()
(gdb) bt
#0  0x00417410 in __kernel_vsyscall ()
#1  0x00a8ddf0 in raise () from /lib/libc.so.6
#2  0x00a8f701 in abort () from /lib/libc.so.6
#3  0x00ac628b in __libc_message () from /lib/libc.so.6
#4  0x00ace5a5 in _int_free () from /lib/libc.so.6
#5  0x00ace9e9 in free () from /lib/libc.so.6
#6  0x08056cc3 in write_data_term ()
#7  0x0805a768 in mainloop ()
#8  0x0805ab37 in main ()

The auto.home file to auto mount user home on Fedore 12 boxes look like:

* -fstype=fuse,mfssubfolder=UserHome/& :mfsmount

All the server / clients run mfs 1.6.19. And all core files are dumped 
from those mounts with Read/Write access. By reading time log of the 
core dump listed above, I found it's dumped at when autofs timeouts (the 
default timeout is 300s on CentOS 5.5).

So I tried manually copy a file (about 80MB) to a user folder which 
haven't been auto mounted, then wait 300s until the folder is auto 
unmounted, the core was dumped as expected.

Does anyone has the same issue? Am I doing the right thing to auto mount 
with Moosefs?

Thanks
Flow