Arvados

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/

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

ward@shell:~$ date > keep/testfile

which just hangs.

On latest main with collection versioning disabled, the problem is identical (tested on tordo).

When the `--disable-event-listening` flag is added to `arv-mount`, the deadlock does not happen.

On latest main with collection versioning enabled (e.g. ce8i5), the deadlock is partially masked due to bug #18005.