Could you please provide the full rbd-nbd log? If it is too large for the attachment then may be via some public url? -- Mykola Golub On Tue, May 18, 2021 at 03:04:51PM +0800, Zhi Zhang wrote: > Hi guys, > > We are recently testing rbd-nbd using ceph N version. After map rbd > image, mkfs and mount the nbd device, the rbd-nbd and dmesg will show > following errors when doing some read/write testing. > > rbd-nbd log: > > 2021-05-18 11:35:08.034 7efdb8ff9700 20 []rbd-nbd: reader_entry: > waiting for nbd request > ... > 2021-05-18 11:35:08.066 7efdb8ff9700 -1 []rbd-nbd: failed to read nbd > request header: (33) Numerical argument out of domain > 2021-05-18 11:35:08.066 7efdb3fff700 20 []rbd-nbd: writer_entry: no io > requests, terminating > 2021-05-18 11:35:08.066 7efdea8d1a00 20 []librbd::ImageState: > 0x564a2be2b3c0 unregister_update_watcher: handle=0 > 2021-05-18 11:35:08.066 7efdea8d1a00 20 []librbd::ImageState: > 0x564a2be2b4b0 ImageUpdateWatchers::unregister_watcher: handle=0 > 2021-05-18 11:35:08.066 7efdea8d1a00 20 []librbd::ImageState: > 0x564a2be2b4b0 ImageUpdateWatchers::unregister_watcher: completing > unregister > 2021-05-18 11:35:08.066 7efdea8d1a00 10 []rbd-nbd: ~NBDServer: terminating > 2021-05-18 11:35:08.066 7efdea8d1a00 20 []librbd::ImageState: > 0x564a2be2b3c0 close > > dmesg: > > [Tue May 18 11:35:07 2021] EXT4-fs (nbd0): mounted filesystem with > ordered data mode. Opts: discard > [Tue May 18 11:35:07 2021] block nbd0: shutting down sockets > [Tue May 18 11:35:09 2021] blk_update_request: I/O error, dev nbd0, > sector 75592 op 0x0:(READ) flags 0x3000 phys_seg 1 prio class 0 > > client host info: > > centos7.x > kernel 5.4.109 > > > It looks like the kernel nbd device shutdown its socket for some > reason, but we haven't figured it out. BTW, we have tried to turn > on/off rbd cache, use different fs ext4/xfs, use ec pool or replicated > pool, but the error remains. It is more frequent for us to reproduce > when batch map, mkfs and mount rbd-nbd on different hosts > simultaneously. > > Thanks for any suggestions. > > Regards, > Zhi Zhang (David) > Contact: zhang.david2011(a)gmail.com > zhangz.david(a)outlook.com > _______________________________________________ > ceph-users mailing list -- ceph-users(a)ceph.io > To unsubscribe send an email to ceph-users-leave(a)ceph.io

On Wed, May 19, 2021 at 11:19 AM Zhi Zhang <zhang.david2011(a)gmail.com> wrote: We found the reader_entry thread got zero byte when trying to read the nbd request header, then rbd-nbd exited and closed the socket. But we haven't figured out why read zero byte?