Re: [Moosefs-users] Core Dumped from mfsmount with Autofs

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

I found a more easy way to re-create the issue.

Just keep the auto.home as:

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

Then copy a file to an unmounted user folder, and run:

service autofs stop

The core file will be dumped.

Flow

On 02/26/2011 04:44 PM, Flow Jiang wrote:
> 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