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SubjectRe: tty-related oops in latest kernel(s)?
Hi Tero,

(I am cc'ing Alan as he's been working on tty code recently.)

On 5/27/07, Tero Roponen <teanropo@jyu.fi> wrote:
> 2.6.22-rc3 (with Reiser4 patch) oopses when watching videos with
> mplayer using neofb console.

[snip]

> Ok, everything seems to work and I can watch the video.
> However, when the mplayer stops I get these warnings:
>
> release_dev: driver.table[3] not tty for (tty4)
> Warning: dev (tty4) tty->count(3) != #fd's(2) in release_dev
> release_dev: driver.table[3] not tty for (tty4)

So sanity check for reference counting failed.

> When I try to repeat the previous step the kernel oopses:
>
> neofb: no support for 32bpp
> Mode (1024x768) larger than the LCD panel (800x600)
> Mode (1152x864) larger than the LCD panel (800x600)
> Mode (1024x1024) larger than the LCD panel (800x600)
> Mode (1280x1024) larger than the LCD panel (800x600)
> BUG: unable to handle kernel NULL pointer dereference at virtual address 00000731
> printing eip:
> c021e50e
> *pde = 00000000
> Oops: 0000 [#1]
> Modules linked in: binfmt_misc floppy loop xirc2ps_cs pcmcia usb_storage parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core evdev uhci_hcd usbcore
> CPU: 0
> EIP: 0060:[<c021e50e>] Not tainted VLI
> EFLAGS: 00010202 (2.6.22-rc3-atr #4)
> EIP is at vt_ioctl+0xda8/0x1482
> eax: 00000679 ebx: 00005600 ecx: c3d41200 edx: 00000000
> esi: 0893159c edi: c0386a2f ebp: 00000003 esp: c26a5e28
> ds: 007b es: 007b fs: 0000 gs: 0033 ss: 0068
> Process mplayer (pid: 1502, ti=c26a5000 task=c3a22500 task.ti=c26a5000)
> Stack: fffffffe c26a5f30 c0149fd9 c29fe400 c3d68600 00000001 4642f7b0 c3d0bcc0
> c3c32464 00000101 00000001 00000000 4644793c 4642f7b0 00000002 00000005
> 0000001b 00000005 c34ad240 c3d0bcc0 c1386000 00000002 00000000 c021d766
> Call Trace:
> [<c0149fd9>] link_path_walk+0xa5/0xaf
> [<c021d766>] vt_ioctl+0x0/0x1482
> [<c021a395>] tty_ioctl+0xa01/0xa87
> [<c0143c5a>] get_empty_filp+0x4f/0xc9
> [<c01439bf>] put_filp+0x14/0x31
> [<c014ab93>] __path_lookup_intent_open+0x6c/0x75
> [<c014ac10>] path_lookup_open+0x20/0x25
> [<c014acd9>] open_namei+0x6e/0x51d
> [<c0141b0c>] do_filp_open+0x25/0x39
> [<c0219994>] tty_ioctl+0x0/0xa87
> [<c014ba8a>] do_ioctl+0x3e/0x4d
> [<c014bc84>] vfs_ioctl+0x1eb/0x202
> [<c014bcce>] sys_ioctl+0x33/0x4d
> [<c01022c2>] sysenter_past_esp+0x5f/0x85
> =======================
> Code: 0f b7 c8 7f 04 85 c9 75 cd 8d 4e 04 89 d8 e8 aa 11 fd ff e9 20 f8 ff ff 8d 04 95 00 00 00 00 03 81 b8 00 00 00 8b 00 85 c0 74 16 <83> b8 b8 00 00 00 00 74 0d 42 83 fa 3f 75 de b0 ff e9 88 f7 ff
> EIP: [<c021e50e>] vt_ioctl+0xda8/0x1482 SS:ESP 0068:c26a5e28

Can we have your .config please? Also, could you work out the file and
line number of vt_ioctl+0xda8/0x1482 like this:

gdb vmlinux
(gdb) l *0xc021e50e

Pekka
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