I found a problem in my cephfs kernel client, a thread hung for days, and I check the stack debug-user@CEPH0207:/home/debug-user$ sudo cat /proc/46071/stack [<ffffffffc0e8fb60>] ceph_mdsc_do_request+0x180/0x240 [ceph] [<ffffffffc0e70e51>] __ceph_do_getattr+0xd1/0x1e0 [ceph] [<ffffffffc0e70fcc>] ceph_getattr+0x2c/0x100 [ceph] [<ffffffffbc05b943>] vfs_getattr_nosec+0x73/0x90 [<ffffffffbc05b996>] vfs_getattr+0x36/0x40 [<ffffffffbc05baae>] vfs_statx+0x8e/0xe0 [<ffffffffbc05c00d>] SYSC_newstat+0x3d/0x70 [<ffffffffbc05c7ae>] SyS_newstat+0xe/0x10 [<ffffffffbc8001a1>] entry_SYSCALL_64_fastpath+0x24/0xab [<ffffffffffffffff>] 0xffffffffffffffff and I found the the session has lost its connection, debug-user@CEPH0207:/home/debug-user$ sudo cat /sys/kernel/debug/ceph/64803197-c207-4012-b8f3-18825d34196c.client15099020/mds_sessions global_id 15099020 name "text" mds.0 reconnecting I guess the client has been in the black list, but it's not, someone can give me some ideas about how to solve the problem or it's a known bug? Thanks. The envrionment info: OS: Ubuntu kernel: linux-image-4.13.0-36-generic cpeh version: luminous
