Comment 13 for bug 752012

Today's 11.04 still has the problem:

[ 226.550326] gnome-panel D 0000000000000000 0 2683 2563 0x00800004
[ 226.550331] ffff8800a6547958 0000000000000086 ffff8800a6547fd8 ffff8800a6546000
[ 226.550334] 0000000000013d00 ffff88005bea1a98 ffff8800a6547fd8 0000000000013d00
[ 226.550338] ffff880091528000 ffff88005bea16e0 ffff8800a336bc48 ffff88008d791d78
[ 226.550341] Call Trace:
[ 226.550359] [<ffffffffa01ce7d1>] wait_for_response.clone.1+0x81/0xd0 [cifs]
[ 226.550365] [<ffffffff81087fb0>] ? autoremove_wake_function+0x0/0x40
[ 226.550372] [<ffffffffa01cf5c3>] SendReceive+0x1a3/0x3b0 [cifs]
[ 226.550379] [<ffffffffa01b4c79>] CIFSSMBUnixQPathInfo+0x139/0x2b0 [cifs]
[ 226.550386] [<ffffffffa01c95dd>] cifs_get_inode_info_unix+0x7d/0x1a0 [cifs]
[ 226.550390] [<ffffffff81192547>] ? unlock_buffer+0x17/0x20
[ 226.550396] [<ffffffffa01c02e0>] ? build_path_from_dentry+0xf0/0x230 [cifs]
[ 226.550403] [<ffffffffa01c0397>] ? build_path_from_dentry+0x1a7/0x230 [cifs]
[ 226.550410] [<ffffffffa01caaba>] cifs_revalidate_dentry+0xfa/0x1e0 [cifs]
[ 226.550416] [<ffffffffa01c01a2>] cifs_d_revalidate+0x22/0x70 [cifs]
[ 226.550420] [<ffffffff8116f0c7>] do_revalidate+0x17/0x60
[ 226.550423] [<ffffffff81171616>] do_lookup+0x236/0x2e0
[ 226.550427] [<ffffffff8116ef83>] ? generic_permission+0x23/0xc0
[ 226.550430] [<ffffffff81171826>] link_path_walk+0x166/0xc40
[ 226.550433] [<ffffffff811725fb>] do_path_lookup+0x5b/0x160
[ 226.550436] [<ffffffff81172967>] user_path_at+0x57/0xa0
[ 226.550440] [<ffffffff8118333f>] ? mntput+0x1f/0x30
[ 226.550445] [<ffffffff812ae314>] ? apparmor_inode_getattr+0x54/0x60
[ 226.550449] [<ffffffff81169398>] ? cp_new_stat+0xf8/0x110
[ 226.550453] [<ffffffff81169659>] vfs_fstatat+0x39/0x70
[ 226.550456] [<ffffffff811696ae>] vfs_lstat+0x1e/0x20
[ 226.550459] [<ffffffff8116994a>] sys_newlstat+0x1a/0x40
[ 226.550463] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b

Also, this is a common problem that comes again and again:
- 5.10: https://bugs.launchpad.net/linux/+bug/24330
- 8.10: https://bugs.launchpad.net/ubuntu/+bug/279043
- 9.10: https://bugs.launchpad.net/ubuntu/+bug/499342
- 11.04 beta: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/752012
- 11.04: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/784030