Re: 2.6.20-git6 usbserial crashes

On Mon, Feb 12, 2007 at 03:29:00PM -0800, Greg KH wrote:
> On Tue, Feb 13, 2007 at 12:23:41AM +0100, Andi Kleen wrote:
> > On Mon, Feb 12, 2007 at 03:20:23PM -0800, Greg KH wrote:
> > > On Tue, Feb 13, 2007 at 12:09:53AM +0100, Andi Kleen wrote:
> > > > 
> > > > Got this while playing around with a toy.
> > > > 
> > > > I have multiple usb serial devices of different types.
> > > 
> > > Did you yank one of them out?  Was a program accessing it at the same
> > > time?
> > 
> > Yes, pilot-xfer was (unsuccessfully) accessing one.
> 
> Ah, the fun visor driver race where it disconnects while userspace is
> just about to close the port :(
> 
> Can you enable debugging in the visor driver:
> 	echo 1 > /sys/module/visor/parameters/debug
> and try to sync again and send me the kernel log output right before it
> crashes?

Hmm, i did that, but it didn't actually log anything new. Just 
the oops again

-Andi

visor ttyUSB0: Handspring Visor / Palm OS converter now disconnected from ttyUSB
0
visor ttyUSB1: Handspring Visor / Palm OS converter now disconnected from ttyUSB
1
usb 5-2: USB disconnect, address 5
/home/lsrc/quilt/linux/drivers/usb/serial/visor.c: visor_shutdown
Unable to handle kernel NULL pointer dereference at 0000000000000020 RIP: 
 [<ffffffff804e3a61>] klist_del+0xa/0x46
PGD 77ad4067 PUD 77bd9067 PMD 0 
Oops: 0000 [1] SMP 
CPU 0 
Modules linked in: pppoe pppox ppp_generic slhc ipt_MASQUERADE i2c_isa snd_pcm_o
ss iptable_nat nf_nat_sip snd_mixer_oss nf_conntrack_sip nf_nat_ftp nf_nat_irc n
f_nat snd_seq snd_seq_device ip6t_LOG ip6t_REJECT ip6table_filter ip6_tables xt_
tcpudp nf_conntrack_ipv4 xt_state nf_conntrack_ftp nf_conntrack_irc nf_conntrack
 ipt_LOG ipt_REJECT iptable_filter ip_tables x_tables snd_hda_intel snd_hda_code
c snd_pcm snd_timer snd snd_page_alloc visor usbserial i2c_i801 i2c_core
Pid: 160, comm: khubd Not tainted 2.6.20-git8-BASIL #120
RIP: 0010:[<ffffffff804e3a61>]  [<ffffffff804e3a61>] klist_del+0xa/0x46
RSP: 0018:ffff81007fe6bc40  EFLAGS: 00010282
RAX: ffff81007e481400 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff81007abde1d8 RSI: 0000000000000046 RDI: ffff81007e481518
RBP: ffff81007e4814f0 R08: ffffffff806e56a0 R09: ffff81007d3ea630
R10: ffff81007eb9dc20 R11: ffffffff8029f6ff R12: ffff81007e481518
R13: ffff81007eb9dc20 R14: ffff81007eb9dc20 R15: ffff810002f98800
FS:  0000000000000000(0000) GS:ffffffff80676000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000020 CR3: 0000000078d43000 CR4: 00000000000006e0
Process khubd (pid: 160, threadinfo ffff81007fe6a000, task ffff81007ee1d600)
Stack:  ffff81007e4814f0 ffff81007e4814f0 ffff81007abde1c0 ffffffff80385df2
 ffff81007abde1c8 ffff81007e4814f0 ffff81007abde1c0 ffff81007abde1c0
 0000000000000000 ffffffff80385fdb 0000000000000002 ffffffff8800bacb
Call Trace:
 [<ffffffff80385df2>] device_del+0x22/0x202
 [<ffffffff80385fdb>] device_unregister+0x9/0x12
 [<ffffffff8800bacb>] :usbserial:destroy_serial+0x98/0xef
 [<ffffffff8800ba33>] :usbserial:destroy_serial+0x0/0xef
 [<ffffffff803314c0>] kref_put+0x5d/0x68
 [<ffffffff8800b938>] :usbserial:usb_serial_disconnect+0x8c/0xb4
 [<ffffffff804111e7>] usb_unbind_interface+0x59/0xa6
 [<ffffffff80388112>] __device_release_driver+0x8e/0xb0
 [<ffffffff80388596>] device_release_driver+0x31/0x49
 [<ffffffff80387a84>] bus_remove_device+0x89/0x9c
 [<ffffffff80385f61>] device_del+0x191/0x202
 [<ffffffff8040ebe5>] usb_disable_device+0x6c/0xdf
 [<ffffffff8040b687>] usb_disconnect+0xa3/0x145
 [<ffffffff8040c4a5>] hub_thread+0x3f7/0xbb7
 [<ffffffff8023aac7>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8040c0ae>] hub_thread+0x0/0xbb7
 [<ffffffff8023a74a>] keventd_create_kthread+0x0/0x65
 [<ffffffff8023a9a0>] kthread+0xd1/0x101
 [<ffffffff8020a038>] child_rip+0xa/0x12
 [<ffffffff8023a74a>] keventd_create_kthread+0x0/0x65
 [<ffffffff8023a8cf>] kthread+0x0/0x101
 [<ffffffff8020a02e>] child_rip+0x0/0x12

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