On Wed, 13 Aug 2014 08:42:34 -0700 Ben Greear <greearb@xxxxxxxxxxxxxxx> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hello! > > Did you get a chance to look at the stacks below? Yes I did, and I replied on Date: Fri, 1 Aug 2014 07:50:53 +1000 The problem is that "fsync" and related functions are not killable. I think it is generally agreed that this is a bug, and that a fix would probably be accepted. I started working on one the other day but haven't got very hard yet (lots of other things to work on). NeilBrown > > Thanks, > Ben > > > On 07/31/2014 02:20 PM, Ben Greear wrote: > > On 07/31/2014 01:42 PM, NeilBrown wrote: > >> On Thu, 31 Jul 2014 11:00:35 -0700 Ben Greear <greearb@xxxxxxxxxxxxxxx> wrote: > > > >>> So, this has been asked all over the interweb for years and years, but the best answer I can find is to reboot the system or create a fake NFS server > >>> somewhere with the same IP as the gone-away NFS server. > >>> > >>> The problem is: > >>> > >>> I have some mounts to an NFS server that no longer exists (crashed/powered down). > >>> > >>> I have some processes stuck trying to write to files open on these mounts. > >>> > >>> I want to kill the process and unmount. > >>> > >>> umount -l will make the mount go a way, sort of. But process is still hung. umount -f complains: umount2: Device or resource busy umount.nfs: > >>> /mnt/foo: device is busy > >>> > >>> kill -9 does not work on process. > > > >> Kill -1 should work (since about 2.6.25 or so). > > > > That is -[ONE], right? Assuming so, it did not work for me. > > > > Kernel is 3.14.4+, with some of extra patches, but probably nothing that influences this particular behaviour. > > > > [root@lf1005-14010010 ~]# cat /proc/3805/stack [<ffffffff811371ba>] sleep_on_page+0x9/0xd [<ffffffff8113738e>] wait_on_page_bit+0x71/0x78 > > [<ffffffff8113769a>] filemap_fdatawait_range+0xa2/0x16d [<ffffffff8113780e>] filemap_write_and_wait_range+0x3b/0x77 [<ffffffffa0f04734>] > > nfs_file_fsync+0x37/0x83 [nfs] [<ffffffff811a8d32>] vfs_fsync_range+0x19/0x1b [<ffffffff811a8d4b>] vfs_fsync+0x17/0x19 [<ffffffffa0f05305>] > > nfs_file_flush+0x6b/0x6f [nfs] [<ffffffff81183e46>] filp_close+0x3f/0x71 [<ffffffff8119c8ae>] __close_fd+0x80/0x98 [<ffffffff81183de5>] > > SyS_close+0x1c/0x3e [<ffffffff815c55f9>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff [root@lf1005-14010010 ~]# kill -1 3805 > > [root@lf1005-14010010 ~]# cat /proc/3805/stack [<ffffffff811371ba>] sleep_on_page+0x9/0xd [<ffffffff8113738e>] wait_on_page_bit+0x71/0x78 > > [<ffffffff8113769a>] filemap_fdatawait_range+0xa2/0x16d [<ffffffff8113780e>] filemap_write_and_wait_range+0x3b/0x77 [<ffffffffa0f04734>] > > nfs_file_fsync+0x37/0x83 [nfs] [<ffffffff811a8d32>] vfs_fsync_range+0x19/0x1b [<ffffffff811a8d4b>] vfs_fsync+0x17/0x19 [<ffffffffa0f05305>] > > nfs_file_flush+0x6b/0x6f [nfs] [<ffffffff81183e46>] filp_close+0x3f/0x71 [<ffffffff8119c8ae>] __close_fd+0x80/0x98 [<ffffffff81183de5>] > > SyS_close+0x1c/0x3e [<ffffffff815c55f9>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff > > > > Thanks, Ben > > > >> If it doesn't please report the kernel version and cat /proc/$PID/stack > > > >> for some processes that cannot be killed. > > > >> NeilBrown > > > >>> > >>> > >>> Aside from bringing a fake NFS server back up on the same IP, is there any other way to get these mounts unmounted and the processes killed without > >>> rebooting? > >>> > >>> Thanks, Ben > >>> > > > > > > > > -- 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 > > > > - -- > Ben Greear <greearb@xxxxxxxxxxxxxxx> > Candela Technologies Inc http://www.candelatech.com > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.13 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJT64dqAAoJELbHqkYeJT4OHC0IAIRB2A8v5msRhXrdd+ybvkwD > NcOSYOhSsxCHIS5BR5CNLg89zipRuocVCbdLRdtbse8nspMq8PAiQJt3YOkGwzos > ifcsgxouMUKfmLcFHtJ0maIkWMPIrttPvHJuw67gt7LbHLPsFjlrdrKPv6aGa95m > 7mCkY/bRniiJYCxrCqixzQpuWfIyVal6FPGtmpydTVh6lq0y05vDEVB8lP5xGyes > w+I/vJkGf9ddTIDasYJbLwUXECbN3makJxmHNAZf4slQMB5FNNnpeTOqL17u62cY > F/do8m/zxzztibTZqjKHIhHGDw/huTyQWfRsQ0AA9Exu8/RZKhJlL2EeYlFJWJQ= > =hNGY > -----END PGP SIGNATURE----- > -- > 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
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