Am Mittwoch, 15. März 2006 05:23 schrieb Bob Copeland:
> hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100
> acm_tty_unregister if=cee8896c dev=cee88980 ref=2
> class_device_del call sysfs_remove_link class_dev=c9a6aec4 ref=2
> dentry=c8f7a2b4
> class_device_del call sysfs_remove_link class_dev->dev=cee88980 ref=1
> dentry=ceaaa1a4 class_name=tty:ttyACM0
> sysfs_hash_and_remove dir=ceaaa1a4 d_inode=6b6b6b6b
sysfs_hash_and_remove() is called for a freed dentry. This is from the second
call in class_device_del().
> Unable to handle kernel paging request at virtual address 6b6b6bfb
> printing eip:
> c02798de
> *pde = 00000000
> Oops: 0000 [#1]
> Modules linked in: ppp_deflate zlib_deflate bsd_comp ppp_async crc_ccitt
> ppp_generic slhc cdc_acm binfmt_misc parport_pc lp parport video thermal
> processor fan button battery ac af_packet nls_iso8859_1 nls_cp437 vfat fat
> dm_mod evdev usb_storage ide_cd sr_mod scsi_mod cdrom i810 drm eth1394 pcmcia
> crc32 tg3 8250_pci 8250 serial_core yenta_socket snd_intel8x0 ieee80211
> ieee80211_crypt ohci1394 ieee1394 rsrc_nonstatic pcmcia_core snd_intel8x0m
> ehci_hcd snd_ac97_codec uhci_hcd snd_ac97_bus usbcore intel_agp agpgart unix
> CPU: 0
> EIP: 0060:[<c02798de>] Not tainted VLI
> EFLAGS: 00010046 (2.6.16-rc6 #26)
> EIP is at __mutex_lock_slowpath+0x70/0x286
> eax: c38e7e18 ebx: c38e6000 ecx: 00000000 edx: 00000054
> esi: 6b6b6bdb edi: cf486a70 ebp: c017595f esp: c38e7e18
> ds: 007b es: 007b ss: 0068
> Process pppd (pid: 3981, threadinfo=c38e6000 task=cf486a70)
> Stack: <0>c38e7e18 c38e7e18 11111111 11111111 c38e7e18 c9a6aec4 cf609cc4
> cf609ccc
> cf609c60 c017595f c3a18748 ceaaa1a4 6b6b6b6b c9a6aec4 cf609cc4
> cf609ccc
> cf609c60 c01e7626 ceaaa1a4 c3a18748 00000000 c3a18748 c9a6aec4
> c8a052ec
> Call Trace:
> [<c017595f>] sysfs_hash_and_remove+0x55/0x12a
> [<c01e7626>] class_device_del+0xd4/0x14f
The kobj frees its dentry to early. I am afraid there's a bug in the kobj code.
Regards
Oliver
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