Glusterfs deadlocks when a volume is mounted over NFS on the same host where glusterfsd is running. I would like to know if this configuration is supported, because I know that some network filesystems can deadlock in this configuration. Deadlock happens when writing a file big enough to fill the filesystem cache and kernel is trying to flush it to free some memory for glusterfsd which needs memory to commit some filesystem blocks to free some memory for glusterfsd... I'm testing glusterfs-3.1.1 on Fedora 14 with kernel 2.6.35.10-74.fc14.x86_64. # ps xaww -Owchan:22 PID WCHAN S TTY TIME COMMAND 1603 nfs_wait_bit_killable D ? 00:00:07 /usr/sbin/glusterfs -f /etc/glusterd/nfs/nfs-server.vol -p /etc/glusterd/nfs/run/nfs.pid -l /var/log/glusterfs/nfs.log 1655 nfs_wait_bit_killable D pts/1 00:00:00 dd if=/dev/zero of=/home/gluster/bigfile bs=1M count=100 # cat /proc/1603/stack [<ffffffffa0100a6c>] nfs_wait_bit_killable+0x34/0x38 [nfs] [<ffffffffa010cea7>] nfs_commit_inode+0x71/0x1d6 [nfs] [<ffffffffa00ff128>] nfs_release_page+0x66/0x83 [nfs] [<ffffffff810d2d47>] try_to_release_page+0x32/0x3b [<ffffffff810de9ec>] shrink_page_list+0x2cf/0x446 [<ffffffff810deeb0>] shrink_inactive_list.clone.35+0x34d/0x5c6 [<ffffffff810df732>] shrink_zone+0x355/0x3e2 [<ffffffff810dfbaa>] do_try_to_free_pages+0x160/0x363 [<ffffffff810dff46>] try_to_free_pages+0x67/0x69 [<ffffffff810da1d3>] __alloc_pages_nodemask+0x525/0x776 [<ffffffff81100015>] alloc_pages_current+0xa9/0xc3 [<ffffffff813fc9cc>] tcp_sendmsg+0x3c5/0x809 [<ffffffff813aefe3>] __sock_sendmsg+0x6b/0x77 [<ffffffff813afd99>] sock_aio_write+0xc2/0xd6 [<ffffffff811176aa>] do_sync_readv_writev+0xc1/0x100 [<ffffffff81117900>] do_readv_writev+0xa7/0x127 [<ffffffff811179c5>] vfs_writev+0x45/0x47 [<ffffffff81117ae8>] sys_writev+0x4a/0x93 [<ffffffff81009cf2>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff # cat /proc/1655/stack [<ffffffffa0100a6c>] nfs_wait_bit_killable+0x34/0x38 [nfs] [<ffffffffa010cfd6>] nfs_commit_inode+0x1a0/0x1d6 [nfs] [<ffffffffa00ff128>] nfs_release_page+0x66/0x83 [nfs] [<ffffffff810d2d47>] try_to_release_page+0x32/0x3b [<ffffffff810de9ec>] shrink_page_list+0x2cf/0x446 [<ffffffff810deeb0>] shrink_inactive_list.clone.35+0x34d/0x5c6 [<ffffffff810df732>] shrink_zone+0x355/0x3e2 [<ffffffff810dfbaa>] do_try_to_free_pages+0x160/0x363 [<ffffffff810dff46>] try_to_free_pages+0x67/0x69 [<ffffffff810da1d3>] __alloc_pages_nodemask+0x525/0x776 [<ffffffff81100015>] alloc_pages_current+0xa9/0xc3 [<ffffffff810d3aa3>] __page_cache_alloc+0x77/0x7e [<ffffffff810d3c6c>] grab_cache_page_write_begin+0x5c/0xa3 [<ffffffffa00ff41e>] nfs_write_begin+0xd4/0x187 [nfs] [<ffffffff810d2f27>] generic_file_buffered_write+0xfa/0x23d [<ffffffff810d498c>] __generic_file_aio_write+0x24f/0x27f [<ffffffff810d4a17>] generic_file_aio_write+0x5b/0xab [<ffffffffa010001f>] nfs_file_write+0xe0/0x172 [nfs] [<ffffffff81116bf6>] do_sync_write+0xcb/0x108 [<ffffffff811172d0>] vfs_write+0xac/0x100 [<ffffffff811174d9>] sys_write+0x4a/0x6e [<ffffffff81009cf2>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff
