Comment 13 for bug 212485

Apologies - I am mistaken! This is not fixed in LP#224750.

Unplugging and replugging the ethernet cable with my homedir mounted over NFSv4 reproduced this in 8.04.1 LTS with 2.6.24-19-generic and all updates as of late July:

[ 708.319893] ------------[ cut here ]------------
[ 708.319962] kernel BUG at /build/buildd/linux-2.6.24/net/sunrpc/rpcb_clnt.c:322!
[ 708.320034] invalid opcode: 0000 [#1] SMP
[ 708.320207] Modules linked in: sonypi ppdev ipv6 acpi_cpufreq cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand freq_table cpufreq_conservat
[ 708.325740]
[ 708.325800] Pid: 6536, comm: gnome-panel Tainted: P (2.6.24-19-generic #1)
[ 708.325903] EIP: 0060:[<f8ce5491>] EFLAGS: 00010287 CPU: 1
[ 708.326019] EIP is at rpcb_getport_async+0x251/0x3d0 [sunrpc]
[ 708.326102] EAX: e8589f00 EBX: e8589f00 ECX: 00000286 EDX: f8cfea20
[ 708.326187] ESI: dfbe1f00 EDI: f3ffd100 EBP: f3efb800 ESP: f2e09c2c
[ 708.326271] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 708.326355] Process gnome-panel (pid: 6536, ti=f2e08000 task=f582c5c0 task.ti=f2e08000)
[ 708.326441] Stack: f2e09c60 00000000 f2e09c60 00000000 f2e09c68 c031b309 f8cdd0a0 e8589f00
[ 708.327031] c01361d7 e8589f48 ffffffff f2e09d70 e8589f00 f3efb800 f2e09d70 e8589f80
[ 708.327620] f8cd6195 c013626e e8589f00 f8cdd07c 00000000 00000000 e8589f00 f8cdd542
[ 708.328222] Call Trace:
[ 708.328384] [<c031b309>] __wait_on_bit+0x59/0x70
[ 708.328528] [<f8cdd0a0>] rpc_wait_bit_interruptible+0x0/0x20 [sunrpc]
[ 708.328705] [<c01361d7>] lock_timer_base+0x27/0x60
[ 708.328851] [<f8cd6195>] call_bind+0x45/0x80 [sunrpc]
[ 708.329011] [<c013626e>] del_timer_sync+0xe/0x20
[ 708.329160] [<f8cdd07c>] rpc_delete_timer+0x2c/0x50 [sunrpc]
[ 708.329337] [<f8cdd542>] __rpc_execute+0x62/0x280 [sunrpc]
[ 708.329509] [<c0137665>] sigprocmask+0x65/0x110
[ 708.329649] [<f8cdcbf4>] rpc_set_active+0x44/0x70 [sunrpc]
[ 708.329832] [<f8cd6f38>] rpc_do_run_task+0x68/0xc0 [sunrpc]
[ 708.330010] [<f8cd700d>] rpc_call_sync+0x1d/0x40 [sunrpc]
[ 708.330185] [<f8d6b633>] nfs4_proc_access+0x73/0x1b0 [nfs]
[ 708.330351] [<c0120000>] __is_prefetch+0x20/0x240
[ 708.330506] [<c0125f20>] default_wake_function+0x0/0x10
[ 708.330652] [<c0125f20>] default_wake_function+0x0/0x10
[ 708.330796] [<c0125f20>] default_wake_function+0x0/0x10
[ 708.330942] [<c0125f20>] default_wake_function+0x0/0x10
[ 708.331101] [<f8d5655d>] nfs_do_access+0xbd/0x2e0 [nfs]
[ 708.331276] [<f8cde5b8>] rpcauth_lookupcred+0x58/0xa0 [sunrpc]
[ 708.331459] [<f8d56834>] nfs_permission+0xb4/0x160 [nfs]
[ 708.331618] [<c01a3f95>] dput+0x85/0x100
[ 708.331771] [<c019916b>] __follow_mount+0x1b/0x70
[ 708.331913] [<f8d56780>] nfs_permission+0x0/0x160 [nfs]
[ 708.332083] [<c0198fe7>] permission+0x97/0x120
[ 708.332227] [<c019acb9>] __link_path_walk+0x79/0xe10
[ 708.332373] [<c0125f20>] default_wake_function+0x0/0x10
[ 708.332522] [<c019ba95>] link_path_walk+0x45/0xc0
[ 708.332670] [<c0146034>] do_gettimeofday+0x34/0xe0
[ 708.332813] [<c021adc0>] copy_to_user+0x30/0x60
[ 708.332956] [<c019bce7>] do_path_lookup+0x77/0x200
[ 708.333095] [<c019aa3a>] getname+0xaa/0xe0
[ 708.333234] [<c019c74b>] __user_walk_fd+0x3b/0x60
[ 708.333376] [<c019c914>] __user_walk+0x14/0x20
[ 708.333512] [<c01bd345>] sys_inotify_add_watch+0x65/0x180
[ 708.333665] [<c0146034>] do_gettimeofday+0x34/0xe0
[ 708.333805] [<c021adc0>] copy_to_user+0x30/0x60
[ 708.333949] [<c01043c2>] sysenter_past_esp+0x6b/0xa9
[ 708.334102] =======================
[ 708.334178] Code: fe ff ff 8b 54 24 1c 0f b7 82 ac 00 00 00 c7 44 24 08 44 a9 ce f8 c7 04 24 70 e0 ce f8 89 44 24 04 e8 14 7d 44 c7 e9 3c fe ff ff <0f> 0b eb
[ 708.337859] EIP: [<f8ce5491>] rpcb_getport_async+0x251/0x3d0 [sunrpc] SS:ESP 0068:f2e09c2c
[ 708.338144] ---[ end trace 8e395e6fce64df61 ]---