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Bug #17983

Updated by Ward Vandewege over 1 year ago

<pre> 
 ward@shell:~$ arv-mount --debug --foreground --read-write --collection pirca-4zz18-nsaus8rzkfeh69m keep/ 
 2021-08-06 14:54:54 arvados.arv-mount[1224] DEBUG: arv-mount debugging enabled 
 2021-08-06 14:54:54 arvados.arv-mount[1224] INFO: /usr/bin/arv-mount 2.2.1 started 
 2021-08-06 14:54:54 arvados.arv-mount[1224] INFO: enable write is True 
 2021-08-06 14:54:54 arvados.arvados_fuse[1224] DEBUG: InodeCache touched inode 1 (size 0) (uuid pirca-4zz18-nsaus8rzkfeh69m) total now 0 (1 entries) 
 FUSE library version: 2.9.9 
 unique: 1, opcode: INIT (26), nodeid: 0, insize: 56, pid: 0 
 INIT: 7.27 
 flags=0x003ffffb 
 max_readahead=0x00020000 
    INIT: 7.19 
    flags=0x00000021 
    max_readahead=0x00020000 
    max_write=0x00020000 
    max_background=0 
    congestion_threshold=0 
    unique: 1, success, outsize: 40 
 unique: 2, opcode: GETATTR (3), nodeid: 1, insize: 56, pid: 1299 
    unique: 2, success, outsize: 120 
 unique: 3, opcode: STATFS (17), nodeid: 1, insize: 40, pid: 1299 
    unique: 3, success, outsize: 96 
 unique: 4, opcode: OPENDIR (27), nodeid: 1, insize: 48, pid: 1311 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: arv-mount opendir: inode 1 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: InodeCache touched inode 1 (size 0) (uuid pirca-4zz18-nsaus8rzkfeh69m) total now 0 (1 entries) 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: Updating collection pirca-4zz18-nsaus8rzkfeh69m inode 1 to record version None 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: <arvados_fuse.fusedir.CollectionDirectory object at 0x7fb99c7c2558> manifest_size 116 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: InodeCache touched inode 1 (size 14848) (uuid pirca-4zz18-nsaus8rzkfeh69m) total now 14848 (1 entries) 
    unique: 4, success, outsize: 32 
 unique: 5, opcode: READDIR (28), nodeid: 1, insize: 80, pid: 1311 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: arv-mount readdir: fh 0 off 0 
    unique: 5, success, outsize: 120 
 unique: 6, opcode: LOOKUP (1), nodeid: 1, insize: 55, pid: 1311 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: InodeCache touched inode 1 (size 14848) (uuid pirca-4zz18-nsaus8rzkfeh69m) total now 14848 (1 entries) 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: arv-mount lookup: parent_inode 1 name 'stderr (1).txt' inode 2 
    unique: 6, success, outsize: 144 
 unique: 7, opcode: READDIR (28), nodeid: 1, insize: 80, pid: 1311 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: arv-mount readdir: fh 0 off 3 
    unique: 7, success, outsize: 16 
 unique: 8, opcode: RELEASEDIR (29), nodeid: 1, insize: 64, pid: 0 
 2021-08-06 14:56:08 arvados.arvados_fuse[1224] DEBUG: arv-mount release fh 0 
    unique: 8, success, outsize: 16 
 unique: 9, opcode: LOOKUP (1), nodeid: 1, insize: 49, pid: 1313 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: InodeCache touched inode 1 (size 14848) (uuid pirca-4zz18-nsaus8rzkfeh69m) total now 14848 (1 entries) 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: arv-mount lookup: parent_inode 1 name 'testfile' not found 
    unique: 9, error: -2 (No such file or directory), outsize: 16 
 unique: 10, opcode: CREATE (35), nodeid: 1, insize: 65, pid: 1313 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: arv-mount create: parent_inode 1 'testfile' 100644 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: collection notify add <arvados.collection.Collection object at 0x7fb99c6a4b70> testfile <arvados.arvfile.ArvadosFile object at 0x7fb99c82b048> 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: collection notify mod <arvados.collection.Collection object at 0x7fb99c6a4b70> testfile (<arvados.arvfile.ArvadosFile object at 0x7fb99c82b048>, <arvados.arvfile.ArvadosFile object at 0x7fb99c82b048>) 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: InodeCache touched inode 1 (size 14848) (uuid pirca-4zz18-nsaus8rzkfeh69m) total now 14848 (1 entries) 
    unique: 10, success, outsize: 160 
 unique: 11, opcode: FLUSH (25), nodeid: 3, insize: 64, pid: 1313 
    unique: 11, success, outsize: 16 
 unique: 12, opcode: GETXATTR (22), nodeid: 3, insize: 68, pid: 1313 
    unique: 12, error: -38 (Function not implemented), outsize: 16 
 unique: 13, opcode: WRITE (16), nodeid: 3, insize: 112, pid: 1313 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: arv-mount write 1 0 32 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: collection notify write <arvados.collection.Collection object at 0x7fb99c6a4b70> testfile (<arvados.arvfile.ArvadosFile object at 0x7fb99c82b048>, <arvados.arvfile.ArvadosFile object at 0x7fb99c82b048>) 
    unique: 13, success, outsize: 24 
 unique: 14, opcode: FLUSH (25), nodeid: 3, insize: 64, pid: 1313 
 2021-08-06 14:56:21 arvados.arvados_fuse[1224] DEBUG: collection notify mod <arvados.collection.Collection object at 0x7fb99c6a4b70> testfile (<arvados.arvfile.ArvadosFile object at 0x7fb99c82b048>, <arvados.arvfile.ArvadosFile object at 0x7fb99c82b048>) 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: {'pirca-bi6l4-1cd520a55b71d5a7': {'href': '/keep_services/pirca-bi6l4-1cd520a55b71d5a7', 'kind': 'arvados#keepService', 'etag': '2k0rcryua3dxrzkrar3m1pvyc', 'uuid': 'pirca-bi6l4-1cd520a55b71d5a7', 'owner_uuid': 'pirca-tpzed-000000000000000', 'created_at': '2021-08-02T14:54:54.574032000Z', 'modified_by_client_uuid': None, 'modified_by_user_uuid': 'pirca-tpzed-000000000000000', 'modified_at': '2021-08-02T14:54:54.574032000Z', 'service_host': 'keep0.pirca.arvadosapi.com', 'service_port': 25107, 'service_ssl_flag': False, 'service_type': 'disk', 'read_only': False, '_service_root': 'http://keep0.pirca.arvadosapi.com:25107/'}, 'pirca-bi6l4-629198f41fae2d7c': {'href': '/keep_services/pirca-bi6l4-629198f41fae2d7c', 'kind': 'arvados#keepService', 'etag': '97c5ja2or0op55az5cx3dxaui', 'uuid': 'pirca-bi6l4-629198f41fae2d7c', 'owner_uuid': 'pirca-tpzed-000000000000000', 'created_at': '2021-08-02T14:54:54.574032000Z', 'modified_by_client_uuid': None, 'modified_by_user_uuid': 'pirca-tpzed-000000000000000', 'modified_at': '2021-08-02T14:54:54.574032000Z', 'service_host': 'keep1.pirca.arvadosapi.com', 'service_port': 25107, 'service_ssl_flag': False, 'service_type': 'disk', 'read_only': False, '_service_root': 'http://keep1.pirca.arvadosapi.com:25107/'}} 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: 0837c95a7eebd0844371cda55d082228+32: ['http://keep1.pirca.arvadosapi.com:25107/', 'http://keep0.pirca.arvadosapi.com:25107/'] 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: Pool max threads is 2 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: Request: PUT http://keep1.pirca.arvadosapi.com:25107/0837c95a7eebd0844371cda55d082228 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: Request: PUT http://keep0.pirca.arvadosapi.com:25107/0837c95a7eebd0844371cda55d082228 
 2021-08-06 14:56:21 arvados.keep[1224] INFO: PUT 200: 32 bytes in 147.55630493164062 msec (0.000 MiB/sec) 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: KeepWriterThread <KeepWriterThread(Thread-37, started daemon 140433837463296)> succeeded 0837c95a7eebd0844371cda55d082228+32 http://keep0.pirca.arvadosapi.com:25107/ 
 2021-08-06 14:56:21 arvados.keep[1224] INFO: PUT 200: 32 bytes in 170.5644130706787 msec (0.000 MiB/sec) 
 2021-08-06 14:56:21 arvados.keep[1224] DEBUG: KeepWriterThread <KeepWriterThread(Thread-36, started daemon 140433845856000)> succeeded 0837c95a7eebd0844371cda55d082228+32 http://keep1.pirca.arvadosapi.com:25107/ 


 </pre> 

 The above backtrace was caused by (in a separate shell): 

 <pre> 
 ward@shell:~$ date > keep/testfile 

 </pre> 

 which just hangs. 

 On latest main, the behavior is better (no hang) but still suboptimal: 

 <pre> 
 ward@shell:~$ arv-mount --foreground --debug --read-write --collection ce8i5-4zz18-k74yj38bjtguqg4 keep 
 2021-08-06 15:19:53 arvados.arv-mount[1884] DEBUG: arv-mount debugging enabled 
 2021-08-06 15:19:53 arvados.arv-mount[1884] INFO: /usr/bin/arv-mount 2.3.0.dev20210726143205 started 
 2021-08-06 15:19:53 arvados.arv-mount[1884] INFO: enable write is True 
 2021-08-06 15:19:53 arvados.arvados_fuse[1884] DEBUG: InodeCache touched inode 1 (size 0) (uuid ce8i5-4zz18-k74yj38bjtguqg4) total now 0 (1 entries) 
 FUSE library version: 2.9.7 
 unique: 2, opcode: INIT (26), nodeid: 0, insize: 56, pid: 0 
 INIT: 7.31 
 flags=0x03fffffb 
 max_readahead=0x00020000 
    INIT: 7.19 
    flags=0x00000021 
    max_readahead=0x00020000 
    max_write=0x00020000 
    max_background=0 
    congestion_threshold=0 
    unique: 2, success, outsize: 40 



 unique: 4, opcode: LOOKUP (1), nodeid: 1, insize: 43, pid: 1925 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: InodeCache touched inode 1 (size 0) (uuid ce8i5-4zz18-k74yj38bjtguqg4) total now 0 (1 entries) 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: Updating collection ce8i5-4zz18-k74yj38bjtguqg4 inode 1 to record version None 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: <arvados_fuse.fusedir.CollectionDirectory object at 0x7f9df1d97b88> manifest_size 102 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: InodeCache touched inode 1 (size 13056) (uuid ce8i5-4zz18-k74yj38bjtguqg4) total now 13056 (1 entries) 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: arv-mount lookup: parent_inode 1 name 'xy' not found 
    unique: 4, error: -2 (No such file or directory), outsize: 16 
 unique: 6, opcode: CREATE (35), nodeid: 1, insize: 59, pid: 1925 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: arv-mount create: parent_inode 1 'xy' 100664 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: collection notify add <arvados.collection.Collection object at 0x7f9df1e44588> xy <arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0> 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: collection notify mod <arvados.collection.Collection object at 0x7f9df1e44588> xy (<arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>, <arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>) 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: InodeCache touched inode 1 (size 13056) (uuid ce8i5-4zz18-k74yj38bjtguqg4) total now 13056 (1 entries) 
    unique: 6, success, outsize: 160 
 unique: 8, opcode: FLUSH (25), nodeid: 3, insize: 64, pid: 1925 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] ERROR: Unhandled exception during FUSE operation 
 Traceback (most recent call last): 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 327, in catch_exceptions_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 835, in flush 
     self._filehandles[fh].flush() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 126, in flush 
     return self.obj.flush() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/fusefile.py", line 80, in flush 
     self.arvfile.parent.root_collection().save() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/arvfile.py", line 469, in must_be_writable_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/arvfile.py", line 270, in synchronized_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/retry.py", line 177, in num_retries_setter 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/collection.py", line 1621, in save 
     ).execute(num_retries=num_retries)) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/googleapiclient/_helpers.py", line 130, in positional_wrapper 
     return wrapped(*args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/googleapiclient/http.py", line 840, in execute 
     raise HttpError(resp, content, uri=self.uri) 
 arvados.errors.ApiError: <HttpError 422 when requesting https://ce8i5.arvadosapi.com/arvados/v1/collections/ce8i5-4zz18-k74yj38bjtguqg4?alt=json returned "//railsapi.internal/arvados/v1/collections/ce8i5-4zz18-k74yj38bjtguqg4: 422 Unprocessable Entity: #<NoMethodError: undefined method `each_line' for nil:NilClass> (req-puytdn1bmo02euf8fjwm)"> 
    unique: 8, error: -5 (Input/output error), outsize: 16 
 unique: 10, opcode: GETXATTR (22), nodeid: 3, insize: 68, pid: 1925 
    unique: 10, error: -38 (Function not implemented), outsize: 16 
 unique: 12, opcode: WRITE (16), nodeid: 3, insize: 109, pid: 1925 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: arv-mount write 0 0 29 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: collection notify write <arvados.collection.Collection object at 0x7f9df1e44588> xy (<arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>, <arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>) 
    unique: 12, success, outsize: 24 
 unique: 14, opcode: FLUSH (25), nodeid: 3, insize: 64, pid: 1925 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: collection notify mod <arvados.collection.Collection object at 0x7f9df1e44588> xy (<arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>, <arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>) 
 NOTIFY: code=2 length=40 
 2021-08-06 15:19:59 arvados.keep[1884] DEBUG: {'ce8i5-bi6l4-e590e84c83da7331': {'href': '/keep_services/ce8i5-bi6l4-e590e84c83da7331', 'kind': 'arvados#keepService', 'etag': '4v201wqdbg3e2tkfepptokiqs', 'uuid': 'ce8i5-bi6l4-e590e84c83da7331', 'owner_uuid': 'ce8i5-tpzed-000000000000000', 'created_at': '2021-08-04T16:51:32.445461000Z', 'modified_by_client_uuid': None, 'modified_by_user_uuid': 'ce8i5-tpzed-000000000000000', 'modified_at': '2021-08-04T16:51:32.445461000Z', 'service_host': 'keep0.ce8i5.arvadosapi.com', 'service_port': 25107, 'service_ssl_flag': False, 'service_type': 'disk', 'read_only': False, '_service_root': 'http://keep0.ce8i5.arvadosapi.com:25107/'}} 
 2021-08-06 15:19:59 arvados.keep[1884] DEBUG: 6553036b26773f12f96a68142e010f6a+29: ['http://keep0.ce8i5.arvadosapi.com:25107/'] 
 2021-08-06 15:19:59 arvados.keep[1884] DEBUG: Pool max threads is 2 
 2021-08-06 15:19:59 arvados.keep[1884] DEBUG: Request: PUT http://keep0.ce8i5.arvadosapi.com:25107/6553036b26773f12f96a68142e010f6a 
 2021-08-06 15:19:59 arvados.keep[1884] INFO: PUT 200: 29 bytes in 619.6091175079346 msec (0.000 MiB/sec) 
 2021-08-06 15:19:59 arvados.keep[1884] DEBUG: KeepWriterThread <KeepWriterThread(Thread-36, started daemon 140315499423488)> succeeded 6553036b26773f12f96a68142e010f6a+29 http://keep0.ce8i5.arvadosapi.com:25107/ 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: collection notify mod <arvados.collection.Collection object at 0x7f9df1e44588> xy (<arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>, <arvados.arvfile.ArvadosFile object at 0x7f9df1d684c0>) 
 NOTIFY: code=2 length=40 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] ERROR: Unhandled exception during FUSE operation 
 Traceback (most recent call last): 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 327, in catch_exceptions_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 835, in flush 
     self._filehandles[fh].flush() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 126, in flush 
     return self.obj.flush() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/fusefile.py", line 80, in flush 
     self.arvfile.parent.root_collection().save() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/arvfile.py", line 469, in must_be_writable_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/arvfile.py", line 270, in synchronized_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/retry.py", line 177, in num_retries_setter 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/collection.py", line 1621, in save 
     ).execute(num_retries=num_retries)) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/googleapiclient/_helpers.py", line 130, in positional_wrapper 
     return wrapped(*args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/googleapiclient/http.py", line 840, in execute 
     raise HttpError(resp, content, uri=self.uri) 
 arvados.errors.ApiError: <HttpError 422 when requesting https://ce8i5.arvadosapi.com/arvados/v1/collections/ce8i5-4zz18-k74yj38bjtguqg4?alt=json returned "//railsapi.internal/arvados/v1/collections/ce8i5-4zz18-k74yj38bjtguqg4: 422 Unprocessable Entity: #<NoMethodError: undefined method `each_line' for nil:NilClass> (req-9r96avrlw2t948a6f7zq)"> 
    unique: 14, error: -5 (Input/output error), outsize: 16 
 unique: 16, opcode: RELEASE (18), nodeid: 3, insize: 64, pid: 0 
 2021-08-06 15:19:59 arvados.arvados_fuse[1884] DEBUG: arv-mount release fh 0 
 2021-08-06 15:20:00 arvados.arvados_fuse[1884] ERROR: Unhandled exception during FUSE operation 
 Traceback (most recent call last): 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 327, in catch_exceptions_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 687, in release 
     self._filehandles[fh].flush() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/__init__.py", line 126, in flush 
     return self.obj.flush() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados_fuse/fusefile.py", line 80, in flush 
     self.arvfile.parent.root_collection().save() 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/arvfile.py", line 469, in must_be_writable_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/arvfile.py", line 270, in synchronized_wrapper 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/retry.py", line 177, in num_retries_setter 
     return orig_func(self, *args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/arvados/collection.py", line 1621, in save 
     ).execute(num_retries=num_retries)) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/googleapiclient/_helpers.py", line 130, in positional_wrapper 
     return wrapped(*args, **kwargs) 
   File "/usr/share/python3/dist/python3-arvados-fuse/lib/python3.6/site-packages/googleapiclient/http.py", line 840, in execute 
     raise HttpError(resp, content, uri=self.uri) 
 arvados.errors.ApiError: <HttpError 422 when requesting https://ce8i5.arvadosapi.com/arvados/v1/collections/ce8i5-4zz18-k74yj38bjtguqg4?alt=json returned "//railsapi.internal/arvados/v1/collections/ce8i5-4zz18-k74yj38bjtguqg4: 422 Unprocessable Entity: #<NoMethodError: undefined method `each_line' for nil:NilClass> (req-055kh17g0sm2d067zexx)"> 
    unique: 16, error: -5 (Input/output error), outsize: 16 


 </pre> 

 The process that tries to write fails instead of hanging, which is better: 

 <pre> 
 ward@shell:~$ date > keep/xy 
 date: write error: Input/output error 
 </pre> 

 Since the keep mount didn't hang, you can now proceed: 

 <pre> 
 ward@shell:~$ cat keep/ 
 file1.txt    xy          
 ward@shell:~$ cat keep/xy  
 Fri Aug    6 15:19:59 UTC 2021 
 cat: keep/xy: Input/output error 
 </pre> 

 But we're in a bad state; the keep mount has cached the addition of the 'xy' file with the content as the output of the date command, which is expected, but when verifying the contents of the collection on workbench, that file is not present.

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