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Description of problem: Kernel crashes with the following trace during umount: BUG: Dentry f7498f70{i=12803e,n=client72} still in use (1) [unmount of nfs 0:18] ------------[ cut here ]------------ kernel BUG at fs/dcache.c:615! invalid opcode: 0000 [#1] SMP last sysfs file: /block/ram0/range Modules linked in: nfs fscache nfsd exportfs lockd nfs_acl ipmi_msghandler kazprocs(U) sunrpc ipv6 dm_mirror dm_mod video sbs i2c_ec button battery asus_acpi ac lp floppy snd_intel8x0 snd_ac97_codec snd_ac97 _bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc ide_cd e100 parport_pc i2c_i801 mii parport pcspkr i2c_core c drom serio_raw ata_piix libata sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd CPU: 0 EIP: 0060:[<c047e49f>] Not tainted VLI EFLAGS: 00010246 (2.6.18-8.el5 #1) EIP is at shrink_dcache_for_umount_subtree+0x133/0x1c1 eax: 00000054 ebx: f7498f70 ecx: c0621b24 edx: de121ee8 esi: 00000001 edi: f7835740 ebp: 0012803e esp: de121ee4 ds: 007b es: 007b ss: 0068 Process umount.nfs (pid: 29559, ti=de121000 task=ebbe5000 task.ti=de121000) Stack: c0621b24 f7498f70 0012803e f7498fd4 00000001 f8d55765 f7835740 f7835600 f8d67980 00000000 00000000 c047ec5d f7835600 c0470153 00000018 f8d67960 c0470248 e1b0d380 f8d3a175 f7835600 c04702d7 f74629c0 f7835600 c0483165 Call Trace: [<c047ec5d>] shrink_dcache_for_umount+0x2e/0x3a [<c0470153>] generic_shutdown_super+0x16/0xd5 [<c0470248>] kill_anon_super+0x9/0x2f [<f8d3a175>] nfs_kill_super+0xc/0x14 [nfs] [<c04702d7>] deactivate_super+0x52/0x65 [<c0483165>] sys_umount+0x1f0/0x218 [<c059c9eb>] release_sock+0xc/0x91 [<c05fd48f>] do_page_fault+0x20a/0x4b8 [<c05fd4f9>] do_page_fault+0x274/0x4b8 [<c0483198>] sys_oldumount+0xb/0xe [<c0403eff>] syscall_call+0x7/0xb ======================= Code: ed 8b 53 0c 8b 33 8b 4b 24 8d b8 40 01 00 00 8b 40 1c 85 d2 8b 00 74 03 8b 6a 20 57 50 56 51 55 53 68 24 1b 62 c0 e8 c5 5c fa ff <0f> 0b 67 02 18 1b 62 c0 83 c4 1c 8b 73 18 39 de 75 04 31 f6 eb EIP: [<c047e49f>] shrink_dcache_for_umount_subtree+0x133/0x1c1 SS:ESP 0068:de121ee4 It happens prettry regularly after long stress tests with bonnie, doing intermittent umounts and mounts. I was able to collect the core, but that did not help much. Version-Release number of selected component (if applicable): 2.6.18-8.el5 How reproducible: Run bonnie & dbench tests with intermittent mounts & umounts. Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
-8.el was the kernel we shipped at RHEL5's release. There have been a few updates to it since. It would be good to see if you can reproduce it on a more recent version. Also, can this be reproduced on a kernel that only contains modules that we ship? I've never heard of the "kazprocs" module. What exactly does it do?
Actually, I think this is likely a duplicate of bug #218718. *** This bug has been marked as a duplicate of 218718 ***