Oh shit the default timeout is 0 if you don't set it in the client. Use the timeout option with nbd client and it should fix it for you. I'll send something up to make this a sane default. Thanks, Josef Sent from my iPhone > On Jul 21, 2017, at 8:15 AM, Adam Borowski <kilobyte@xxxxxxxxxx> wrote: > > Hi! > I'm afraid that 4.13-rc1 nbd aborts connection on writes for me: > > [ 251.938384] block nbd0: Send data failed (result -11) > [ 251.943484] block nbd0: Request send failed trying another connection > [ 251.950034] block nbd0: Receive control failed (result -32) > [ 251.955676] block nbd0: Attempted send on invalid socket > [ 251.961022] print_req_error: I/O error, dev nbd0, sector 2206344 > [ 251.961025] block nbd0: shutting down sockets > > Not all kinds of writes trigger the problem. For example, you can dd to the > nbd block device, likewise badblocks -w succeeds without a hitch. Yet at > least btrfs and swap disconnect nearly immediately. Reads seem to work: for > example, btrfs can usually mount and scrub successfully, yet minor writes > that happen on a filesystem mounted rw even without explicit user-level > writes cause a disconnect in a short time. "Real" writes to the filesystem > trigger it apparently outright. Likewise, to use swap you need to write to > it first, thus it fails quickly. > > Reproduced on arm64 (Pine64) first. As this SoC just switched from an > out-of-tree ethernet driver to a completely different new one (dwmac-sun8i), > and such a switch can't be bisected, I assumed that's the culprit and did > not complain while in -next. > > However, turns out the same happens on a bog-standard amd64, both on bare > metal and in qemu. > > In all of these cases, the server is an amd64 Debian stretch, kernel > 4.9.30-2+deb9u2, nbd-server 1:3.15.2-3. > > Bisect blames dc88e34d "nbd: set sk->sk_sndtimeo for our sockets", and > indeed, reverting that patch makes everything fine again. > > > Bisect log: > # bad: [63a86362130f4c17eaa57f3ef5171ec43111a54e] Merge tag 'pm-4.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm > # good: [6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c] Linux 4.12 > git bisect start 'linus/master' 'v4.12' > # bad: [55a7b2125cf4739a8478d2d7223310ae7393408c] Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux > git bisect bad 55a7b2125cf4739a8478d2d7223310ae7393408c > # bad: [1849f800fba32cd5a0b647f824f11426b85310d8] Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc > git bisect bad 1849f800fba32cd5a0b647f824f11426b85310d8 > # bad: [cbcd4f08aa637b74f575268770da86a00fabde6d] Merge tag 'staging-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging > git bisect bad cbcd4f08aa637b74f575268770da86a00fabde6d > # bad: [1b044f1cfc65a7d90b209dfabd57e16d98b58c5b] Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > git bisect bad 1b044f1cfc65a7d90b209dfabd57e16d98b58c5b > # bad: [892ad5acca0b2ddb514fae63fa4686bf726d2471] Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > git bisect bad 892ad5acca0b2ddb514fae63fa4686bf726d2471 > # bad: [e442cbf910c71fba5926cf757dd7f8fcce22fc5f] pktcdvd: remove the call to blk_queue_bounce > git bisect bad e442cbf910c71fba5926cf757dd7f8fcce22fc5f > # bad: [d86c4d8ef31b3d99c681c859cb4e936dafc2d7a4] nvme: move reset workqueue handling to common code > git bisect bad d86c4d8ef31b3d99c681c859cb4e936dafc2d7a4 > # bad: [fdd050b5b3c96813ae6756ed68157d32ba31b9f2] Merge branch 'uuid-types' of bombadil.infradead.org:public_git/uuid into nvme-base > git bisect bad fdd050b5b3c96813ae6756ed68157d32ba31b9f2 > # bad: [a104c9f22c7d073d4ae308ca36383ce5cc4631cc] nvme-rdma: fix merge error > git bisect bad a104c9f22c7d073d4ae308ca36383ce5cc4631cc > # good: [b040ad9cf6a169cc000a5324fcada695dfa1f4b3] loop: fix error handling regression > git bisect good b040ad9cf6a169cc000a5324fcada695dfa1f4b3 > # bad: [36ffc6c1c0e67acdacb53348350d0a37206dbadf] block_dev: propagate bio_iov_iter_get_pages error in __blkdev_direct_IO > git bisect bad 36ffc6c1c0e67acdacb53348350d0a37206dbadf > # bad: [f729b66fca43d850d564b264c2033980c00a14b0] gfs2: remove the unused sd_log_error field > git bisect bad f729b66fca43d850d564b264c2033980c00a14b0 > # bad: [401741547f95c0883fe143ac446d92c772937556] nvme-lightnvm: use blk_execute_rq in nvme_nvm_submit_user_cmd > git bisect bad 401741547f95c0883fe143ac446d92c772937556 > # bad: [dc88e34d69d87c370deaa9d613dac8e3a0411f59] nbd: set sk->sk_sndtimeo for our sockets > git bisect bad dc88e34d69d87c370deaa9d613dac8e3a0411f59 > # first bad commit: [dc88e34d69d87c370deaa9d613dac8e3a0411f59] nbd: set sk->sk_sndtimeo for our sockets > > > Meow! > -- > ⢀⣴⠾⠻⢶⣦⠀ > ⣾⠁⢠⠒⠀⣿⡁ A dumb species has no way to open a tuna can. > ⢿⡄⠘⠷⠚⠋⠀ A smart species invents a can opener. > ⠈⠳⣄⠀⠀⠀⠀ A master species delegates.
