Re: OOPS in 2.6.13-rc1-mm1 -- EIP is at sysfs_release+0x49/0xb0

[Sonny Rao <sonny@burdell.org>]

On Tue, Aug 09, 2005 at 09:09:57AM +1000, Keith Owens wrote:
> On Mon, 8 Aug 2005 10:44:04 -0700, 
> Andrew Morton <akpm@osdl.org> wrote:
> >Sonny Rao <sonny@burdell.org> wrote:
> >> Modules linked in: cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave 
> >> cpufreq_ondemand cpufreq_conservative ipv6 video thermal processor hotkey fan co
> >> ntainer button battery ac nfs lockd sunrpc af_packet tg3 ohci_hcd usbcore generi
> >> c serverworks i2c_piix4 i2c_core sworks_agp agpgart pcspkr rtc floppy tsdev dm_m
> >> od parport_pc lp parport ide_generic ide_disk ide_cd cdrom ide_core unix
> >> CPU:    0
> >> EIP:    0060:[<c01a8bcc>]    Not tainted VLI
> >> EFLAGS: 00010246   (2.6.13-rc4-mm1) 
> >> EIP is at sysfs_release+0x4c/0xb0
> >> eax: 762f7373   ebx: 762f7373   ecx: 00000001   edx: ef3c5000
> >> esi: f596a188   edi: f21fecc0   ebp: ef3c5f3c   esp: ef3c5f2c
> >> ds: 007b   es: 007b   ss: 0068
> >> Process udev (pid: 11843, threadinfo=ef3c5000 task=ef78e550)
> >> Stack: f596a188 00000010 f762d580 c21bc944 ef3c5f68 c0166cea c21bc944 f762d580 
> >>        00000000 00000000 c2137980 ec7e9748 f762d580 dcae7300 00000000 ef3c5f78 
> >>        c0166aeb f762d580 f762d580 ef3c5f94 c01650ab f762d580 dcae7300 dcae7300 
> >> Call Trace:
> >>  [<c010401f>] show_stack+0x7f/0xa0
> >>  [<c01041d4>] show_registers+0x164/0x1d0
> >>  [<c0104422>] die+0x122/0x1c0
> >>  [<c030db1e>] do_page_fault+0x2ce/0x600
> >>  [<c0103ccb>] error_code+0x4f/0x54
> >>  [<c0166cea>] __fput+0x1da/0x1f0
> >>  [<c0166aeb>] fput+0x2b/0x50
> >>  [<c01650ab>] filp_close+0x4b/0x80
> >>  [<c016514e>] sys_close+0x6e/0x90
> >>  [<c010312f>] sysenter_past_esp+0x54/0x75
> >> Code: 85 f6 8b 40 14 8b 58 04 74 08 89 34 24 e8 0d 97 04 00 85 db 74 38 b8 01 00
> >>  00 00 e8 af 18 f7 ff e8 4a e5 04 00 c1 e0 07 8d 04 18 <ff> 88 00 01 00 00 83 3b
> >>  02 74 49 b8 01 00 00 00 e8 cf 18 f7 ff 
> >>  <6>note: udev[11843] exited with preempt_count 1
> >> Using generic hotkey driver
> >> ibm_acpi: acpi_evalf(DHKC, d, ...) failed: 4097
> >> ibm_acpi: `enable,0xffff' invalid for parameter `hotkey'
> >> toshiba_acpi: Unknown parameter `hotkeys_over_acpi'
> >> apm: BIOS not found.
> >> 
> >> Let me see if I can reproduce this on either 2.6.13-rc4 or  2.6.13-rc6 
> >> 
> >> Machine is an IBM x335 (dual P4), and I'm not using any framebuffer
> >> stuff. 
> >> 
> >
> >Keith, does this look like the use-after-free which you've been hitting?
> 
> It is certainly in the same place, freeing the data that is chained off
> sd->s_element.  This oops does not show any memory poisoning, but I am
> guessing that the kernel was not compiled with slab debugging.  On
> balance, it looks like the same problem.

You are correct; I didn't have slab debugging on.
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