On Fri, Oct 30, 2015 at 3:02 PM, Jeenu Viswambharan <jeenuv@xxxxxxxxx> wrote: > On Fri, Oct 30, 2015 at 2:54 PM, Jeenu Viswambharan <jeenuv@xxxxxxxxx> wrote: >> I've a development board whose root file system is shared via. NFS >> from my PC (3.13.0-66-generic #108-Ubuntu SMP x86_64 GNU/Linux). The >> behaviour at times is that board mounts the NFS share, but then soon >> thereafter, while in execution, it started displaying NFS timeouts, >> retries, and hangs. That's the end of it. > > I missed to mention that once this happens, the board won't boot > again: it'll wait for the root file system to be mounted, fails, and > then crashes. Even restarting NFS server doesn't help. I found signs that the NFS server is probably allowing access to the said share, but for some reason Linux on my development board wouldn't boot. I found the following traces in syslog, indicating retries from the Linux boot: Nov 2 11:48:26 e105349-lin rpc.mountd[7920]: authenticated mount request from 10.1.197.27:912 for /work/nfs (/work/nfs) Nov 2 11:49:09 e105349-lin rpc.mountd[7920]: authenticated mount request from 10.1.197.27:899 for /work/nfs (/work/nfs) Nov 2 11:50:02 e105349-lin rpc.mountd[7920]: authenticated mount request from 10.1.197.27:871 for /work/nfs (/work/nfs) Nov 2 11:51:15 e105349-lin rpc.mountd[7920]: authenticated mount request from 10.1.197.27:759 for /work/nfs (/work/nfs) Nov 2 11:52:48 e105349-lin rpc.mountd[7920]: authenticated mount request from 10.1.197.27:999 for /work/nfs (/work/nfs) Nov 2 11:54:21 e105349-lin rpc.mountd[7920]: authenticated mount request from 10.1.197.27:792 for /work/nfs (/work/nfs) Also, there are entries in /var/lib/nfs/rmtab for the said NFS share. For some reason the board isn't happy with all these, and gives up citing NFS timeout: [ 197.211808] VFS: Unable to mount root fs via NFS, trying floppy. [ 197.214885] VFS: Cannot open root device "nfs" or unknown-block(2,0): error -6 [ 197.218459] Please append a correct "root=" boot option; here are the available partitions: [ 197.222611] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0) [ 197.226702] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.15.0-rc8+ #2 Could somebody help diagnose the problem please? -- Jeenu -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
