geom gate freezes the system

[Eric Saint-Etienne]

> I have no clue of what's happening.
> Could someone experienced in geom have a look please?

sysctl show buffers seems exhausted:
	vfs.maxbufspace: 90013696
	vfs.bufspace: 89292800

After the filesystem lockage, these values have changed :
        vfs.ufs.dirhash_mem: 70984				90573
        vfs.devfs.generation: 101				103
        vfs.getnewbufcalls: 1135				31152
        vfs.numfreebuffers: 5478				4839
        vfs.numdirtybuffers: 16					245
        vfs.recursiveflushes: 2					4766
        vfs.bufreusecnt: 875					5450
        vfs.bufmallocspace: 8192				6144
        vfs.bufspace: 14336000					89292800
        vfs.runningbufspace: 65536				5679104
        vfs.cache.numfullpathfound: 36				253
        vfs.cache.numfullpathcalls: 36				253
        vfs.cache.nchstats: 29755 2576 38 0 2291 0 18 141	89820 3947
262 0 4187 0 48 253
        vfs.cache.numneghits: 2576				3947
        vfs.cache.numnegzaps: 10				184
        vfs.cache.numposhits: 29755				89821
        vfs.cache.numposzaps: 28				78
        vfs.cache.nummisszap: 11				41
        vfs.cache.nummiss: 2280					4146
        vfs.cache.numchecks: 32742				94133
        vfs.cache.dotdothits: 17				367
        vfs.cache.dothits: 178					1208
        vfs.cache.numcalls: 34854				99788
        vfs.cache.numcache: 624					1259
        vfs.cache.numneg: 39					61
        vfs.reassignbufcalls: 310				10896
        vfs.freevnodes: 53					197
        vfs.numvnodes: 638					1403
(on the left, the original value, on the right the new value)

for info the whole output before running /bin/cp on the mounted ggate0:
        vfs.ufs.dirhash_reclaimage: 5
        vfs.ufs.dirhash_lowmemcount: 0
        vfs.ufs.dirhash_docheck: 0
        vfs.ufs.dirhash_mem: 90573
        vfs.ufs.dirhash_maxmem: 2097152
        vfs.ufs.dirhash_minsize: 2560
        vfs.devfs.rule_depth: 1
        vfs.devfs.generation: 103
        vfs.nfs.downdelayinitial: 12
        vfs.nfs.downdelayinterval: 30
        vfs.nfs.skip_wcc_data_onerr: 1
        vfs.nfs.nfs3_jukebox_delay: 10
        vfs.nfs.reconnects: 0
        vfs.nfs.bufpackets: 4
        vfs.nfs.defect: 0
        vfs.nfs.iodmax: 20
        vfs.nfs.iodmin: 0
        vfs.nfs.iodmaxidle: 120
        vfs.nfs.diskless_rootpath:
        vfs.nfs.diskless_valid: 0
        vfs.nfs.nfs_ip_paranoia: 1
        vfs.nfs.nfs_directio_allow_mmap: 1
        vfs.nfs.nfs_directio_enable: 0
        vfs.nfs.clean_pages_on_close: 1
        vfs.nfs.nfsv3_commit_on_close: 0
        vfs.nfs.prime_access_cache: 0
        vfs.nfs.access_cache_timeout: 60
        vfs.pfs.trace: 0
        vfs.pfs.vncache.misses: 0
        vfs.pfs.vncache.hits: 0
        vfs.pfs.vncache.maxentries: 0
        vfs.pfs.vncache.entries: 0
        vfs.flushwithdeps: 0
        vfs.notbufdflashes: 0
        vfs.flushbufqtarget: 100
        vfs.getnewbufrestarts: 0
        vfs.getnewbufcalls: 31152
        vfs.hifreebuffers: 620
        vfs.lofreebuffers: 310
        vfs.numfreebuffers: 4839
        vfs.dirtybufthresh: 1253
        vfs.hidirtybuffers: 1393
        vfs.lodirtybuffers: 696
        vfs.numdirtybuffers: 245
        vfs.recursiveflushes: 4766
        vfs.altbufferflushes: 0
        vfs.bdwriteskip: 0
        vfs.dirtybufferflushes: 0
        vfs.hirunningspace: 1048576
        vfs.lorunningspace: 524288
        vfs.bufdefragcnt: 0
        vfs.buffreekvacnt: 0
        vfs.bufreusecnt: 5450
        vfs.hibufspace: 89358336
        vfs.lobufspace: 89292800
        vfs.maxmallocbufspace: 4467916
        vfs.bufmallocspace: 6144
        vfs.maxbufspace: 90013696
        vfs.bufspace: 89292800
        vfs.runningbufspace: 5679104
        vfs.vmiodirenable: 1
        vfs.cache.numfullpathfound: 253
        vfs.cache.numfullpathfail4: 0
        vfs.cache.numfullpathfail2: 0
        vfs.cache.numfullpathfail1: 0
        vfs.cache.numfullpathcalls: 253
        vfs.cache.nchstats: 89820 3947 262 0 4187 0 48 253
        vfs.cache.numupgrades: 1
        vfs.cache.numneghits: 3947
        vfs.cache.numnegzaps: 184
        vfs.cache.numposhits: 89821
        vfs.cache.numposzaps: 78
        vfs.cache.nummisszap: 41
        vfs.cache.nummiss: 4146
        vfs.cache.numchecks: 94133
        vfs.cache.dotdothits: 367
        vfs.cache.dothits: 1208
        vfs.cache.numcalls: 99788
        vfs.cache.numcache: 1259
        vfs.cache.numneg: 61
        vfs.ncsizefactor: 2
        vfs.ncnegfactor: 16
        vfs.read_max: 8
        vfs.write_behind: 1
        vfs.lookup_shared: 1
        vfs.usermount: 0
        vfs.worklist_len: 5
        vfs.timestamp_precision: 0
        vfs.reassignbufcalls: 10896
        vfs.vlru_allow_cache_src: 0
        vfs.freevnodes: 197
        vfs.wantfreevnodes: 13222
        vfs.numvnodes: 1403
        vfs.nfs_common.realign_count: 0
        vfs.nfs_common.realign_test: 0
        vfs.nfsrv.nfs_privport: 0
        vfs.nfsrv.fha.bin_shift: 18
        vfs.nfsrv.fha.max_nfsds_per_fh: 8
        vfs.nfsrv.fha.max_reqs_per_nfsd: 4
        vfs.nfsrv.fha.fhe_stats: No file handle entries.
        vfs.nfsrv.commit_miss: 0
        vfs.nfsrv.commit_blks: 0
        vfs.nfsrv.async: 0
        vfs.nfsrv.gatherdelay_v3: 0
        vfs.nfsrv.gatherdelay: 10000
        vfs.nfsrv.minthreads: 1
        vfs.nfsrv.maxthreads: 1
        vfs.nfsrv.threads: 0
        vfs.nfsrv.request_space_used: 0
        vfs.nfsrv.request_space_used_highest: 0
        vfs.nfsrv.request_space_high: 12877824
        vfs.nfsrv.request_space_low: 8585216
        vfs.nfsrv.request_space_throttled: 0
        vfs.nfsrv.request_space_throttle_count: 0
        vfs.ffs.doreallocblks: 1
        vfs.ffs.doasyncfree: 1
        vfs.ffs.compute_summary_at_mount: 0
        vfs.fuse.kernelabi_minor: 8
        vfs.fuse.kernelabi_major: 7
        vfs.fuse.maxtickets: 0
        vfs.fuse.iov_credit: 16
        vfs.fuse.iov_permanent_bufsize: 524288
        vfs.fuse.maxfreetickets: 1024
        vfs.fuse.fuse4bsd_version: 0.3.9-pre1
        vfs.fuse.sync_unmount: 1
        vfs.fuse.enforce_dev_perms: 0
        vfs.fuse.init_backgrounded: 1

-eric