Date:	Mon, 18 Feb 2008 04:59:13 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	linux-kernel@...ith.clara.net
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Oops on 2.6.24.2 "rmmod fan" && "rmmod 8250_pnp"

On Fri, 15 Feb 2008 00:34:19 +0000 linux-kernel@...ith.clara.net wrote:

> ...
>
> Also managed to get a nasty issue with rmmod 8250_pnp and agetty. I
> have the machine boot up to use ttyS0 as the console. On removing 8250_pnp.ko
> it threw the following oops and then promptly wrote thousands of lines of
> errors, all saying:
> 
> [ 1193.307736] release_dev: ttyS0: read/write wait queue active!
> 
> Feb 14 18:53:01 nike kernel: [ 1114.912518]  at 0000000000000010 RIP:
> Feb 14 18:53:01 nike kernel: [ 1114.913047] PGD 75552067 PUD 75074067 PMD 0
> Feb 14 18:53:01 nike kernel: [ 1114.913653] CPU 0
> Feb 14 18:53:01 nike kernel: [ 1114.913920] Modules linked in: ipv6 ipt_owner ipt_LOG xt_limit ipt_REJECT xt_tcpudp nf_conntrack_ipv4 xt_state nf_conntrack iptable_filter ip_tables x
> _tables binfmt_misc quota_v2 sbshc sbp2 firewire_sbp2 nvram ohci1394 8250_pnp ieee1394 firewire_ohci 8250 firewire_core serial_core crc_itu_t forcedeth sg unix dm_mod libusual sata_n
> v libata sd_mod scsi_mod ext3 jbd mbcache ssb pcmcia pcmcia_core firmware_class usbcore
> Feb 14 18:53:01 nike kernel: [ 1114.916274] Pid: 3320, comm: agetty Not tainted 2.6.24.2 #1
> Feb 14 18:53:01 nike kernel: [ 1114.916525] RIP: 0010:[<ffffffff88240160>]  [<ffffffff88240160>] :serial_core:uart_chars_in_buffer+0xf/0x1c
> Feb 14 18:53:01 nike kernel: [ 1114.917028] RSP: 0000:ffff8100754d7bf8  EFLAGS: 00010292
> Feb 14 18:53:01 nike kernel: [ 1114.917279] RAX: ffff81007b1af9b0 RBX: 7fffffffffffffff RCX: 000000001d60dd26
> Feb 14 18:53:01 nike kernel: [ 1114.917532] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff810075517090
> Feb 14 18:53:01 nike kernel: [ 1114.917785] RBP: ffff8100754d7bf8 R08: ffff8100755173c8 R09: 00000000755173a8
> Feb 14 18:53:01 nike kernel: [ 1114.918038] R10: ffffffff805a7f38 R11: 0000000000000001 R12: ffff810075517090
> Feb 14 18:53:01 nike kernel: [ 1114.918298] R13: 7fffffffffffffff R14: 0000000000000000 R15: 0000000000005403
> Feb 14 18:53:01 nike kernel: [ 1114.918554] FS:  00002b1ad993b6f0(0000) GS:ffffffff8057a000(0000) knlGS:0000000000000000
> Feb 14 18:53:01 nike kernel: [ 1114.919031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> Feb 14 18:53:01 nike kernel: [ 1114.919283] CR2: 0000000000000010 CR3: 0000000076568000 CR4: 00000000000006e0
> Feb 14 18:53:01 nike kernel: [ 1114.919536] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> Feb 14 18:53:01 nike kernel: [ 1114.919789] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Feb 14 18:53:01 nike kernel: [ 1114.920043] Process agetty (pid: 3320, threadinfo ffff8100754d6000, task ffff8100754d4000)
> Feb 14 18:53:01 nike kernel: [ 1114.920519] Stack:  ffff8100754d7c58 ffffffff80384ff6 0000000000000000 ffff8100754d4000
> Feb 14 18:53:01 nike kernel: [ 1114.921102]  ffffffff8024e355 ffff8100755173c8 ffff8100755173c8 0000000000000296
> Feb 14 18:53:01 nike kernel: [ 1114.921663]  ffff8100754d7c58 ffff8100755170a8 ffff810075517090 0000000000000002
> Feb 14 18:53:01 nike kernel: [ 1114.921981] Call Trace:
> Feb 14 18:53:01 nike kernel: [ 1114.922486]  [<ffffffff80384ff6>] tty_wait_until_sent+0xa6/0x108
> Feb 14 18:53:01 nike kernel: [ 1114.922741]  [<ffffffff8024e355>] autoremove_wake_function+0x0/0x38
> Feb 14 18:53:01 nike kernel: [ 1114.922996]  [<ffffffff80385159>] set_termios+0x101/0x399
> Feb 14 18:53:01 nike kernel: [ 1114.923249]  [<ffffffff8037ea9c>] tty_ldisc_try+0x40/0x47
> Feb 14 18:53:01 nike kernel: [ 1114.923504]  [<ffffffff8042403b>] _spin_unlock_irqrestore+0x3f/0x47
> Feb 14 18:53:01 nike kernel: [ 1114.923760]  [<ffffffff803854e8>] tty_mode_ioctl+0xf7/0x266
> Feb 14 18:53:01 nike kernel: [ 1114.924014]  [<ffffffff80385867>] n_tty_ioctl+0x210/0x221
> Feb 14 18:53:01 nike kernel: [ 1114.924268]  [<ffffffff803823a1>] tty_ioctl+0xc78/0xce2
> Feb 14 18:53:01 nike kernel: [ 1114.924523]  [<ffffffff802d5547>] inotify_inode_queue_event+0x4f/0xe0
> Feb 14 18:53:01 nike kernel: [ 1114.924779]  [<ffffffff80309ecc>] inode_has_perm+0x6b/0x7a
> Feb 14 18:53:01 nike kernel: [ 1114.925034]  [<ffffffff802a53c0>] check_bytes_and_report+0x38/0xcb
> Feb 14 18:53:01 nike kernel: [ 1114.925288]  [<ffffffff80309f82>] file_has_perm+0xa7/0xb6
> Feb 14 18:53:01 nike kernel: [ 1114.925543]  [<ffffffff802b8d8a>] do_ioctl+0x5e/0x77
> Feb 14 18:53:01 nike kernel: [ 1114.931362]  [<ffffffff802b8ff4>] vfs_ioctl+0x251/0x26e
> Feb 14 18:53:01 nike kernel: [ 1114.931616]  [<ffffffff802b9068>] sys_ioctl+0x57/0x7b
> Feb 14 18:53:01 nike kernel: [ 1114.931869]  [<ffffffff8020c21a>] tracesys+0xdc/0xe1
> Feb 14 18:53:01 nike kernel: [ 1114.932123]
> Feb 14 18:53:01 nike kernel: [ 1114.932368]
> Feb 14 18:53:01 nike kernel: [ 1114.932369] Code: 8b 42 10 2b 42 14 c9 25 ff 0f 00 00 c3 48 8b 87 b0 00 00 00
> Feb 14 18:53:01 nike kernel: [ 1114.934036]  RSP <ffff8100754d7bf8>
> Feb 14 18:53:01 nike kernel: [ 1114.934554] ---[ end trace d01c9c9b8dd780f4 ]---
> 
> Agetty is spawned via:
> 
> S0:2345:respawn:/sbin/agetty -h -L ttyS0 115200 vt100

uhm, Alan has been poking around in there but it wouldn't surprise me if
this bug as bene there for ages.

> This kernel is 2.6.24.2 from kernel.org and configured only with
> "make allmodconfig".

An allmodconfig kernel actually works?  I never knew that.
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