"CIFS VFS: Error -104 sending data on socket to server" というエラーが表示され、CIFS マウントにアクセスできない

Issue

• "CIFS VFS: Error -104 sending data on socket to server" というエラーが表示され、CIFS マウントにアクセスできません。続いて、ブロックされたタスクメッセージ と、CIFS I/O の完了を待機している間にタスクがスタックしていることを示す呼び出しトレースが表示されます。

Sep 16 00:21:43 sg1dbs1s kernel: CIFS VFS: Error -104 sending data on socket to server
Sep 16 00:21:43 sg1dbs1s kernel: CIFS VFS: Error -104 sending data on socket to server
Sep 16 00:21:43 sg1dbs1s kernel: CIFS VFS: Error -32 sending data on socket to server
Sep 16 00:26:27 sg1dbs1s kernel: INFO: task postgres:12987 blocked for more than 120 seconds.
Sep 16 00:26:27 sg1dbs1s kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 16 00:26:27 sg1dbs1s kernel: postgres        D ffffffff816895f0     0 12987   8964 0x00000084
Sep 16 00:26:27 sg1dbs1s kernel: ffff8800ba293c50 0000000000000086 ffff8802b2bbce70 ffff8800ba293fd8
Sep 16 00:26:27 sg1dbs1s kernel: ffff8800ba293fd8 ffff8800ba293fd8 ffff8802b2bbce70 ffff8802bfc96c40
Sep 16 00:26:27 sg1dbs1s kernel: 0000000000000000 7fffffffffffffff ffff8802bffac3e8 ffffffff816895f0
Sep 16 00:26:27 sg1dbs1s kernel: Call Trace:
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff816895f0>] ? bit_wait+0x50/0x50
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8168b579>] schedule+0x29/0x70
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff81688fc9>] schedule_timeout+0x239/0x2d0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff810eaa6c>] ? ktime_get_ts64+0x4c/0xf0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8113cb5f>] ? delayacct_end+0x8f/0xb0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff810eaa6c>] ? ktime_get_ts64+0x4c/0xf0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff816895f0>] ? bit_wait+0x50/0x50
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8168ab1e>] io_schedule_timeout+0xae/0x130
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8168abb8>] io_schedule+0x18/0x20
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff81689601>] bit_wait_io+0x11/0x50
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff81689125>] __wait_on_bit+0x65/0x90
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8117fb61>] wait_on_page_bit+0x81/0xa0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff810b16c0>] ? wake_bit_function+0x40/0x40
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8117fc91>] filemap_fdatawait_range+0x111/0x1b0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8117fd57>] filemap_fdatawait+0x27/0x30
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff81181ecc>] filemap_write_and_wait+0x4c/0x80
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffffa03e2db5>] cifs_flush+0x25/0x30 [cifs]
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff811fb8d4>] filp_close+0x34/0x80
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff8121cc38>] __close_fd+0x78/0xa0
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff811fd473>] SyS_close+0x23/0x50
Sep 16 00:26:27 sg1dbs1s kernel: [<ffffffff816964c9>] system_call_fastpath+0x16/0x1b