Comment 96 for bug 769927

I have a similar (maybe?) bug that started with FC15. I run CrashPlan client on a nfs auto mounted file system. The kernel above didn't fix it. I only have 1 CPU.

2.6.38.8-32.bz708039.1.fc15.i686 #1 SMP Thu Jun 16 17:51:40 UTC 2011 i686 i686 i386 GNU/Linux

[138413.271428] BUG: Dentry f02ad480{i=13f2d0,n=/} still in use (1) [unmount of autofs autofs]
[138413.274358] ------------[ cut here ]------------
[138413.275316] kernel BUG at fs/dcache.c:947!
[138413.275316] invalid opcode: 0000 [#1] SMP
[138413.275316] last sysfs file: /sys/devices/virtual/bdi/0:81/uevent
[138413.275316] Modules linked in: nfs lockd fscache nfs_acl auth_rpcgss sunrpc p4_clockmod vfat fat snd_intel8x0 snd_ac97_codec ac97_bus snd_seq snd_seq_device snd_pcm ppdev iTCO_wdt e100 iTCO_vendor_support parport_pc mii snd_timer snd microcode soundcore parport i2c_i801 snd_page_alloc serio_raw i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last unloaded: mperf]
[138413.275316]
[138413.275316] Pid: 1885, comm: automount Not tainted 2.6.38.8-32.bz708039.1.fc15.i686 #1 Compaq Evo D510 CMT/07E8h
[138413.275316] EIP: 0060:[<c04f382d>] EFLAGS: 00010296 CPU: 0
[138413.275316] EIP is at shrink_dcache_for_umount_subtree+0xd0/0x162
[138413.275316] EAX: 00000065 EBX: f02ad480 ECX: 00000046 EDX: 00000000
[138413.275316] ESI: c093985f EDI: f282115c EBP: f43a9edc ESP: f43a9eac
[138413.275316] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[138413.275316] Process automount (pid: 1885, ti=f43a8000 task=f2bbd7f0 task.ti=f43a8000)
[138413.275316] Stack:
[138413.275316] c092d11a f02ad480 0013f2d0 f02ad4a4 00000001 c093985f f282115c 00000000
[138413.275316] f02ad4a4 f02ad480 f2821000 c07f9e64 f43a9eec c04f401b f2821000 c67ba780
[138413.275316] f43a9f08 c04e5e3d f5b9a740 c67ba780 00000029 c67ba780 f409fa00 f43a9f14
[138413.275316] Call Trace:
[138413.275316] [<c04f401b>] shrink_dcache_for_umount+0x3e/0x4a
[138413.275316] [<c04e5e3d>] generic_shutdown_super+0x1e/0xb8
[138413.275316] [<c04e5f48>] kill_anon_super+0x11/0x44
[138413.275316] [<c04e5f99>] kill_litter_super+0x1e/0x21
[138413.275316] [<c05812fe>] autofs4_kill_sb+0x35/0x39
[138413.275316] [<c04e610a>] deactivate_locked_super+0x1f/0x40
[138413.275316] [<c04e6a9b>] deactivate_super+0x2e/0x31
[138413.275316] [<c04f8694>] mntput_no_expire+0xb5/0xb9
[138413.275316] [<c04f8f32>] sys_umount+0x270/0x297
[138413.275316] [<c04f8f77>] sys_oldumount+0x1e/0x20
[138413.275316] [<c07d691c>] syscall_call+0x7/0xb
[138413.275316] [<c07d0000>] ? audit_log_exit+0xbca/0xdc3
[138413.275316] Code: 03 8b 41 60 89 54 24 10 8b 55 f0 89 7c 24 18 89 74 24 14 89 5c 24 04 89 54 24 0c 89 44 24 08 c7 04 24 1a d1 92 c0 e8 2c b5 2d 00 <0f> 0b 8b 73 10 39 f3 75 0c 8d 43 68 31 f6 e8 24 2b 0e 00 eb 16
[138413.275316] EIP: [<c04f382d>] shrink_dcache_for_umount_subtree+0xd0/0x162 SS:ESP 0068:f43a9eac
[138413.418764] ---[ end trace 073c5e8debef6d67 ]---