[Bug 12977] New: oops unmounting pmount'ed CD or DVD disc with inotify enabled

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Ubuntu | linux

           Summary: oops unmounting pmount'ed CD or DVD disc with inotify
                    enabled
           Product: Ubuntu
           Version: unspecified
          Platform: i386
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: linux
        AssignedTo: fabbione at ubuntu.com
        ReportedBy: trisk at acm.jhu.edu
         QAContact: kernel-bugs at lists.ubuntu.com


Whenever I unmount (using pumount) a removable disc that was mounted using     
pmount, I get the oops below. I'm running with inotify enabled, but the    
problem occurs even if there's no inotify watch on that filesystem.    
HAL doesn't register the unmount after the oops (volume.is_mounted = true). 
Tested on linux-image-2.6.10-5-k7.   
   
       
Unable to handle kernel NULL pointer dereference at virtual address       
00000010       
 printing eip:       
c017a692       
*pde = 00000000       
Oops: 0000 [#1]       
PREEMPT       
Modules linked in: nls_cp437 isofs udf nvidia ipx iptable_nat ipt_state       
ip_conntrack iptable_filter ip_tables pcspkr snd_emu10k1 snd_rawmidi       
snd_seq_device snd_ac97_codec snd_util_mem snd_hwdep capability commoncap       
snd_pcm_oss snd_pcm snd_timer snd_page_alloc snd_mixer_oss snd soundcore       
ipv6 af_packet floppy lp ide_cd parport_pc parport i2c_viapro pci_hotplug       
via_agp agpgart tsdev mousedev joydev evdev usblp usbhid emu10k1_gp       
gameport ehci_hcd uhci_hcd usbcore 3c59x via_rhine mii rtc sr_mod cdrom       
sata_via i2c_algo_bit i2c_core unix fbcon font bitblit vesafb cfbcopyarea       
cfbimgblt cfbfillrect xfs ext3 jbd mbcache libata ide_generic via82cxxx       
sd_mod scsi_mod ide_pnp ide_disk ide_core       
CPU:    0       
EIP:    0060:[<c017a692>]    Tainted: P      VLI       
EFLAGS: 00210296   (2.6.10-5-k7)       
EIP is at inotify_super_block_umount+0x67/0x12f       
eax: 00000010   ebx: cee66000   ecx: c02d3754   edx: c02d3860       
esi: 00000008   edi: cee66000   ebp: d5941548   esp: cee67ef4       
ds: 007b   es: 007b   ss: 0068       
Process umount (pid: 7830, threadinfo=cee66000 task=d7dcf080)       
Stack: c16dbc60 d582c258 00002000 00000000 00000000 cee66000 c02d3860       
c02d3754       
       c3ce0074 c59c0400 e0f9dae0 cee66000 c015a309 c59c0400 c59c0400       
defb9200       
       080506af c015aef6 c59c0400 00000005 c59c0400 e0f9dce0 c015a1ef       
c59c0400       
Call Trace:       
 [<c015a309>] generic_shutdown_super+0x27/0x130       
 [<c015aef6>] kill_block_super+0x2d/0x50       
 [<c015a1ef>] deactivate_super+0x5b/0x8a       
 [<c017007e>] sys_umount+0x3f/0x8e       
 [<c01480fd>] do_munmap+0x142/0x17f       
 [<c014818a>] sys_munmap+0x50/0x74       
 [<c01700e4>] sys_oldumount+0x17/0x1b       
 [<c0102efb>] syscall_call+0x7/0xb       
Code: bb 00 00 00 89 4c 24 14 8b 44 24 14 83 40 14 01 8b 4c 24 1c 8b 54 24       
1c 81 c2 0c 01 00 00 89 54 24 18 8b 81 0c 01 00 00 8d 70 f8 <8b> 6e 08 83       
ed 08 39 d0 74 5a bf 00 e0 ff ff 21 e7 8b 5e 14 83       
 <6>note: umount[7830] exited with preempt_count 2       
scheduling while atomic: umount/0x00000002/7830       
 [<c028d2d5>] schedule+0x52f/0x534       
 [<c0143dfd>] unmap_page_range+0x4b/0x71       
 [<c0143fcb>] unmap_vmas+0x1a8/0x1b6       
 [<c01484f0>] exit_mmap+0x84/0x15c       
 [<c0115ec5>] mmput+0x37/0xa0       
 [<c011a6d5>] do_exit+0x175/0x477       
 [<c0112e0c>] do_page_fault+0x0/0x5c8       
 [<c01040a1>] do_trap+0x0/0x110       
 [<c0112e0c>] do_page_fault+0x0/0x5c8       
 [<c01183d6>] printk+0x17/0x1b       
 [<c011303d>] do_page_fault+0x231/0x5c8       
 [<c0120799>] update_process_times+0x46/0x52       
 [<c0114320>] try_to_wake_up+0xa4/0xb3       
 [<c01208ca>] run_timer_softirq+0x10f/0x1ae       
 [<c0114bf7>] __wake_up_common+0x38/0x57       
 [<c0112e0c>] do_page_fault+0x0/0x5c8       
 [<c0103933>] error_code+0x2b/0x30       
 [<c017a692>] inotify_super_block_umount+0x67/0x12f       
 [<c015a309>] generic_shutdown_super+0x27/0x130       
 [<c015aef6>] kill_block_super+0x2d/0x50       
 [<c015a1ef>] deactivate_super+0x5b/0x8a       
 [<c017007e>] sys_umount+0x3f/0x8e       
 [<c01480fd>] do_munmap+0x142/0x17f       
 [<c014818a>] sys_munmap+0x50/0x74       
 [<c01700e4>] sys_oldumount+0x17/0x1b       
 [<c0102efb>] syscall_call+0x7/0xb

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