Orion Poplawski <orion@...> writes: > > See https://bugzilla.redhat.com/show_bug.cgi?id=820707 > > If the network is disconnected it is impossible to unmount, even if no > processes are accessing the mount. umount -f and umount -l both hang on > readlink("/home/orion"). umount needs to canonicalize the path so it does a readlink on the path given to it. This hangs. Here's the kernel trace. [94630.673017] umount.nfs D 0000009c 0 14999 14882 0x00000080 [94630.673017] c30f5c38 00000086 00000001 0000009c ed110004 1b928142 0000560e 00000000 [94630.673017] c0c4b180 ed37c000 c0c4b180 f5007180 f6b37110 c32ef110 c30f5c28 f7fd6243 [94630.673017] c2f9c580 c30f5c20 f7fd9ff2 f82520c0 00000246 c30f5c0c c0927c33 c30f5c30 [94630.673017] Call Trace: [94630.673017] [<f7fd6243>] ? xs_sendpages+0x63/0x1f0 [sunrpc] [94630.673017] [<f7fd9ff2>] ? __rpc_sleep_on_priority+0x122/0x210 [sunrpc] [94630.673017] [<c0927c33>] ? _raw_spin_unlock_bh+0x13/0x20 [94630.673017] [<c0927c33>] ? _raw_spin_unlock_bh+0x13/0x20 [94630.673017] [<c0926ed5>] schedule+0x35/0x50 [94630.673017] [<f7fd96fd>] rpc_wait_bit_killable+0x2d/0x70 [sunrpc] [94630.673017] [<c09259a1>] __wait_on_bit+0x51/0x70 [94630.673017] [<f7fd96d0>] ? __rpc_wait_for_completion_task+0x30/0x30 [sunrpc] [94630.673017] [<f7fd96d0>] ? __rpc_wait_for_completion_task+0x30/0x30 [sunrpc] [94630.673017] [<c0925a21>] out_of_line_wait_on_bit+0x61/0x70 [94630.673017] [<c0455480>] ? autoremove_wake_function+0x50/0x50 [94630.673017] [<f7fda2e7>] __rpc_execute+0x187/0x2a0 [sunrpc] [94630.673017] [<c0455423>] ? wake_up_bit+0x23/0x30 [94630.673017] [<f7fda548>] rpc_execute+0x38/0x40 [sunrpc] [94630.673017] [<f7fd30a9>] rpc_run_task+0x59/0x70 [sunrpc] [94630.673017] [<f7fd31bc>] rpc_call_sync+0x3c/0x60 [sunrpc] [94630.673017] [<f84aff63>] _nfs4_call_sync+0x23/0x30 [nfs] [94630.673017] [<f84afc3e>] _nfs4_proc_getattr+0x8e/0xa0 [nfs] [94630.673017] [<f84b385b>] nfs4_proc_getattr+0x3b/0x60 [nfs] [94630.673017] [<f849d311>] __nfs_revalidate_inode+0x81/0x210 [nfs] [94630.673017] [<f849d5df>] nfs_revalidate_inode+0x2f/0x50 [nfs] [94630.673017] [<f8496b3f>] nfs_check_verifier+0x4f/0x80 [nfs] [94630.673017] [<f8498ca2>] nfs_lookup_revalidate+0x232/0x450 [nfs] [94630.673017] [<c05ead5e>] ? autofs4_d_manage+0x8e/0xf0 [94630.673017] [<f8499811>] nfs_open_revalidate+0x41/0x220 [nfs] [94630.673017] [<c053e79b>] ? follow_managed+0x19b/0x1f0 [94630.673017] [<c053ff00>] ? unlazy_walk+0xd0/0x180 [94630.673017] [<c0540153>] ? do_lookup+0x1a3/0x350 [94630.673017] [<c053f748>] complete_walk+0x88/0xc0 [94630.673017] [<c0540cc3>] path_lookupat+0x63/0x620 [94630.673017] [<c0523b89>] ? kmem_cache_alloc+0x29/0x120 [94630.673017] [<c065a998>] ? strncpy_from_user+0x38/0x70 [94630.673017] [<c05412aa>] do_path_lookup+0x2a/0xb0 [94630.673017] [<c0542466>] user_path_at_empty+0x46/0x80 [94630.673017] [<c092b557>] ? do_page_fault+0x1b7/0x450 [94630.673017] [<c050c074>] ? remove_vma+0x44/0x60 [94630.673017] [<c054e233>] ? mntput_no_expire+0x23/0x100 [94630.673017] [<c0539313>] sys_readlinkat+0x43/0xb0 [94630.673017] [<c05393ac>] sys_readlink+0x2c/0x30 [94630.673017] [<c0927ed4>] syscall_call+0x7/0xb This appears to wait forever. This pretty much makes it impossible to use krb5 nfs4 with laptops where the network can disappear. -- 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
