Public bug reported:
ubuntu version: Ubuntu 12.04.2 LTS
kernel version: Linux boris-System-Product-Name 3.5.0-29-generic
#49~precise1-Ubuntu SMP Wed May 8 00:08:45 UTC 2013 x86_64 x86_64 x86_64
GNU/Linux
action:
sudo insmod tiny_tty.ko
sudo rmmod tiny_tty.ko
sudo insmod tiny_tty.ko
dmesg:
[ 3800.078041] ------------[ cut here ]------------
[ 3800.078053] WARNING: at
/build/buildd/linux-lts-quantal-3.5.0/fs/proc/generic.c:586
proc_register+0xbf/0x170()
[ 3800.078055] Hardware name: System Product Name
[ 3800.078056] proc_dir_entry 'driver/tiny_tty' already registered
[ 3772.423808] Tiny TTY driver v2.0
[ 3800.078058] Modules linked in: tiny_tty(O+) pci_stub vboxpci(O)
vboxnetadp(O) vboxnetflt(O) vboxdrv(O) bnep rfcomm bluetooth parport_pc ppdev
nfsd nfs binfmt_misc lockd fscache auth_rpcgss nfs_acl sunrpc
snd_hda_codec_hdmi snd_hda_codec_via snd_hda_intel snd_hda_codec bridge stp llc
snd_hwdep i915 snd_pcm snd_seq_midi kvm_intel snd_rawmidi kvm drm_kms_helper
snd_seq_midi_event drm snd_seq snd_timer ghash_clmulni_intel snd_seq_device snd
aesni_intel i2c_algo_bit cryptd joydev aes_x86_64 psmouse soundcore eeepc_wmi
asus_wmi alx snd_page_alloc sparse_keymap pcspkr serio_raw mac_hid video
microcode mei wmi lpc_ich mdio coretemp lp parport hid_generic usbhid hid ahci
libahci [last unloaded: tiny_tty]
[ 3800.078111] Pid: 3661, comm: insmod Tainted: G O 3.5.0-29-generic
#49~precise1-Ubuntu
[ 3800.078113] Call Trace:
[ 3800.078120] [<ffffffff81052c7f>] warn_slowpath_common+0x7f/0xc0
[ 3800.078124] [<ffffffff81052d76>] warn_slowpath_fmt+0x46/0x50
[ 3800.078130] [<ffffffff813320bc>] ? ida_get_new_above+0x24c/0x310
[ 3800.078134] [<ffffffff811ef10f>] proc_register+0xbf/0x170
[ 3800.078139] [<ffffffff811ef515>] proc_create_data+0x75/0xd0
[ 3800.078143] [<ffffffff811f1d34>] proc_tty_register_driver+0x54/0x70
[ 3800.078147] [<ffffffff813eb9ae>] tty_register_driver+0x14e/0x310
[ 3800.078152] [<ffffffffa0008000>] ? 0xffffffffa0007fff
[ 3800.078157] [<ffffffffa00080ab>] tiny_init+0xab/0x1000 [tiny_tty]
[ 3800.078162] [<ffffffff8100203f>] do_one_initcall+0x3f/0x170
[ 3800.078167] [<ffffffff810b83be>] sys_init_module+0xbe/0x220
[ 3800.078173] [<ffffffff816a4d69>] system_call_fastpath+0x16/0x1b
[ 3800.078175] ---[ end trace d7af2e4f1c4a0ae6 ]---
When I read from /proc/tty/driver/tiny_tty from application, kernel will
crash. This happens because driver was unloaded, but proc entry point
was not removed (entry created by tty_register_driver)
I'm attaching example code to reproduce this bug
** Affects: linux-lts-quantal (Ubuntu)
Importance: Undecided
Status: Invalid
** Tags: kernel-bug serial tty
** Package changed: erlang (Ubuntu) => linux-lts-quantal (Ubuntu)
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https://bugs.launchpad.net/bugs/1368311
Title:
Kernel OOPS on reload serial driver
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