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SubjectRe: 2.6.12-rc1-mm3
Hi Dmitry and others,

At 06:41 a.m. 31/03/2005, Dmitry Torokhov wrote:
>On Monday 28 March 2005 06:02, Russell King wrote:
> > Looks like something in the input layer went bang. The code in
> > serport_ldisc_write_wakeup is:
> >
> > 0: 8b 80 a8 09 00 00 mov 0x9a8(%eax),%eax
> > 6: 8b 40 14 mov 0x14(%eax),%eax
> > 9: 8b 50 70 mov 0x70(%eax),%edx <====
> > c: 85 d2 test %edx,%edx
> > e: 74 09 je 0x19
> >
> > and the marked line exploded on you. The above instructions correspond
> > with:
> >
> > 0: struct serport *sp = (struct serport *) tty->disc_data;
> > 6: serio_drv_write_wakeup(sp->serio);
> > 9: if (serio->drv
> >
> > So, "serio" was this strange 0xf3a6cdf8 value. But why? One for the
> > input people I think.
>
>Reuben, could you please try the patch below? Thanks!
>
>Russell, could you please tell me if ldisc->write_wakeup (tty_wakwup) and
>ldisc->read are allowed to be called from an IRQ context? IOW I wonder if
>I can use spil_lock_bh instead of spil_lock_irqsave to protect serport
>flags.
>
>--
>Dmitry
>
> serport.c | 98
> +++++++++++++++++++++++++++++++++++++++++++-------------------
> 1 files changed, 68 insertions(+), 30 deletions(-)
>
>Index: dtor/drivers/input/serio/serport.c
>===================================================================
>--- dtor.orig/drivers/input/serio/serport.c
>+++ dtor/drivers/input/serio/serport.c
>@@ -27,11 +27,15 @@ MODULE_LICENSE("GPL");
> MODULE_ALIAS_LDISC(N_MOUSE);


I've done some testing this afternoon and it seems that this patch
fixes the problem in -mm4. I don't even have a serial
mouse/keyboard, but do have a serial PCI card onboard. The box has a
USB connection to a Belkin KVM instead of directly attached input devices.

I also note that it is occurring on kernel-smp-2.6.11-1.1219_FC4 - so
it is probably a problem in mainline as well as -mm.


Now I'm crashing a bit further through the shutdown, here's the stacktrace:

INIT: Sending processes the TERM signal
Stopping yum: Disabling nightly yum update: [ OK ]
[ OK ]
Stopping cups-config-daemon: [ OK ]
Stopping HAL daemon: [ OK ]
Stopping system message bus: [ OK ]
Stopping atd: [ OK ]
Stopping cups: [ OK ]
Shutting down xfs: [ OK ]
[ OK ] down console mouse services: [ OK ]
Shutting down NFS mountd: [ OK ]
Shutting down NFS daemon: nfsd: last server has exited
nfsd: unexporting all filesystems
RPC: error 5 connecting to server localhost
RPC: failed to contact portmap (errno -5).
Unable to handle kernel paging request at virtual address f2826d2c
printing eip:
c01337a9
*pde = 00000000
Oops: 0000 [#1]
SMP DEBUG_PAGEALLOC
Modules linked in: nfsd exportfs md5 ipv6 lp snd_usb_audio
snd_usb_lib pwc video
dev usb_storage autofs4 eeprom lm85 i2c_sensor rfcomm l2cap bluetooth nfs lockd
sunrpc dm_mod video button battery ac ohci1394 ieee1394 uhci_hcd
ehci_hcd parpor
t_serial parport_pc parport hw_random i2c_i801 i2c_core emu10k1_gp
gameport snd_
emu10k1 snd_rawmidi snd_seq_device snd_ac97_codec snd_pcm_oss
snd_mixer_oss snd_
pcm snd_timer snd_page_alloc snd_util_mem snd_hwdep snd soundcore
e100 mii flopp
y ext3 jbd ata_piix libata sd_mod scsi_mod
CPU: 0
EIP: 0060:[<c01337a9>] Not tainted VLI
EFLAGS: 00010087 (2.6.12-rc1-mm4)
EIP is at worker_thread+0x149/0x230
eax: 00000001 ebx: 00000212 ecx: f7eb4018 edx: f2826d20
esi: f2826d24 edi: f7eb4000 ebp: 00000000 esp: f7e83f7c
ds: 007b es: 007b ss: 0068
Process events/0 (pid: 8, threadinfo=f7e83000 task=f7fefad0)
Stack: f7eb4028 f7eb4010 f7eb4018 f7e83000 f2826d20 c014f4b0 00000001 00000000
000f41fa 00010000 00000000 00000000 f7fefad0 c011ea50 00100100 00200200
ffffffff ffffffff fffffffc f7e46f54 f7eb4000 c0133660 c0137694 ffffffff
Call Trace:
[<c014f4b0>] cache_reap+0x0/0x240
[<c011ea50>] default_wake_function+0x0/0x10
[<c0133660>] worker_thread+0x0/0x230
[<c0137694>] kthread+0x94/0xa0
[<c0137600>] kthread+0x0/0xa0
[<c01023f5>] kernel_thread_helper+0x5/0x10
Code: 00 00 89 f8 e8 19 e3 1e 00 89 c3 8b 47 40 40 89 47 40 83 f8 03
0f 8f bd 00
00 00 8b 77 10 3b 74 24 04 74 71 8d 56 fc 89 54 24 10 <8b> 42 0c 89
44 24 14 8b
6a 10 8b 46 04 8b 16 89 10 89 36 89 42
[ OK ]
Shutting down NFS quotas: [FAILED]
Shutting down NFS services: [ OK ]
Stopping sshd: [ OK ]
Stopping postfix: Shutting down postfix: <3>BUG: soft lockup
detected on CPU#0!

Pid: 3413, comm: rpc.rquotad
EIP: 0060:[<c0321ac0>] CPU: 0
EIP is at _spin_lock_irqsave+0x20/0x50
EFLAGS: 00000286 Not tainted (2.6.12-rc1-mm4)
EAX: f7eb4000 EBX: 00000246 ECX: f7eb4000 EDX: c22021a0
ESI: f7eb4000 EDI: c22021a0 EBP: c01335b0 DS: 007b ES: 007b
CR0: 8005003b CR2: 800147fc CR3: 37256d20 CR4: 000006e0
[<c013350c>] __queue_work+0xc/0x50
[<c012cc17>] run_timer_softirq+0xd7/0x1c0
[<c0128950>] __do_softirq+0x80/0x100
[<c0106adb>] do_softirq+0x4b/0x50
=======================
[<c010511c>] apic_timer_interrupt+0x1c/0x30
[<c02b7ed8>] kfree_skbmem+0x8/0x20
[<c02b007b>] cpufreq_governor+0x3b/0x50
[<c014eed2>] kfree+0x62/0x90
[<c02b7ed8>] kfree_skbmem+0x8/0x20
[<c02b7fcc>] __kfree_skb+0xdc/0x1a0
[<c02d2501>] netlink_recvmsg+0xf1/0x230
[<c02b422a>] sock_recvmsg+0xfa/0x120
[<c02b40d2>] sock_sendmsg+0xe2/0x110
[<c0137b20>] autoremove_wake_function+0x0/0x30
[<c0149d32>] __alloc_pages+0x122/0x440
[<c01d94a2>] copy_from_user+0x42/0x80
[<c02b5ba9>] sys_recvmsg+0x109/0x1e0
[<c01d94a2>] copy_from_user+0x42/0x80
[<c02b553e>] sys_sendto+0xfe/0x140
[<c011a863>] do_page_fault+0x253/0x6a1
[<c017c6a1>] d_alloc+0x141/0x1a0
[<c01648d1>] fd_install+0x21/0x50
[<c02b3e57>] sock_map_fd+0xf7/0x130
[<c032068d>] schedule+0x97d/0xc10
[<c02b5e67>] sys_socketcall+0x1e7/0x200
[<c0103fbb>] sysenter_past_esp+0x54/0x79

System is an up to date FC4- devel box with a 2.8 Ghz SMP Intel processor.

reuben



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