[Bugme-new] [Bug 8906] New: Some kind of Oops removing firewire_ohci module

[bugme-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=8906

           Summary: Some kind of Oops removing firewire_ohci module
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.23-rc3-hrt2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IEEE1394
        AssignedTo: drivers_ieee1394 at kernel-bugs.osdl.org
        ReportedBy: B.W.Duncan at sms.ed.ac.uk


Most recent kernel where this bug did not occur: 2.6.22
Distribution: Debian unstable
Hardware Environment: ULI laptop
Software Environment: latest -rc with hrtimers patch
Problem Description: modprobe -r firewire_ohci gives some kind of oops which
stops my keyboard working

Steps to reproduce: simply remove the firewire_ohci module. I don't have any
firewire devices to plug in.

However, expecting it to oops again, I tried rmmod'ing firewire_ohci and then
firewire_core (its only dependency). It didn't oops.

I've made it oops about 3 times now. Once, my keyboard just kept repeating the
'enter' key. Each other time it just stops responding. Music keeps playing and
I can still use the magic SysRq keys.

The oops is:
======= CUT ========
ACPI: PCI interrupt for device 0000:00:10.2 disabled
firewire_ohci: Removed fw-ohci device.
PGD 203067 PUD 207063 PMD 36f1d067 PTE 0
CPU 0
Modules linked in: rc80211_simple snd_hda_intel i2c_ali1535 i2c_ali15x3 snd_pcm
snd_page_alloc mac80211 ehci_hcd ohci_hcd
Pid: 5, comm: events/0 Not tainted 2.6.23-rc3-hrt2 #2
RIP: 0010:[<ffffffff8806a560>]  [<ffffffff8806a560>]
RSP: 0018:ffff810037f93eb8  EFLAGS: 00010247
RAX: ffff810037fc7f80 RBX: ffff810037fc7f80 RCX: ffff8100367dd680
RDX: ffff810037fc7f80 RSI: ffff810037f93ee0 RDI: ffff8100367dd678
RBP: ffffffff8806a560 R08: ffff810037f92000 R09: 0000000000000001
R10: 000000000040c3a9 R11: 0000000000000246 R12: ffffffff8023cf00
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  00002af78a6d76e0(0000) GS:ffffffff80677000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: ffffffff8806a560 CR3: 0000000022092000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process events/0 (pid: 5, threadinfo ffff810037f92000, task ffff810037f90000)
Stack:  ffffffff8023c62f 0000000000000000 ffff810037fc7f90 ffff810037fc7f80
 ffffffff8023cfc3 0000000000000000 ffff810037f90000 ffffffff80240250
 ffff810037f93ef8 ffff810037f93ef8 0000000000000001 00000000fffffffc
Call Trace:
 [<ffffffff8023c62f>] run_workqueue+0x6f/0xf0
 [<ffffffff8023cfc3>] worker_thread+0xc3/0x130
 [<ffffffff80240250>] autoremove_wake_function+0x0/0x30
 [<ffffffff8023cf00>] worker_thread+0x0/0x130
 [<ffffffff8023fe2b>] kthread+0x4b/0x80
 [<ffffffff8020c2a8>] child_rip+0xa/0x12
 [<ffffffff8023fde0>] kthread+0x0/0x80
 [<ffffffff8020c29e>] child_rip+0x0/0x12


Code:  Bad RIP value.
 RSP <ffff810037f93eb8>
SysRq : Emergency Sync
Emergency Sync complete
SysRq : Emergency Remount R/O
======= CUT ======

Bruce


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