problem when testing with ttyUSB

Okash Khawaja okash.khawaja at gmail.com
Sat Apr 1 14:45:02 EDT 2017


Okay, it was me trying to play with tty->driver_data. But usb-serial.c
uses it for its own purposes.

Thanks,
Okash

On Sat, Apr 01, 2017 at 07:12:09PM +0100, Okash Khawaja wrote:
> Hi,
> 
> I am testing Apollo and DoubleTalk LT using USB serial converter, so
> over ttyUSB0. In the call to tty_open_by_driver I am passing in (188,0).
> TTY opens without errors and ldsic is assigned too. But as soon as an
> operation is called on the tty_struct, there is a general protection or
> segmentation fault. Following is call trace from Apollo calling
> speakup_tty->ops->write. Similar call trace results from ltlk calling
> tty_write_room(speakup_tty) through spk_ttyio_synth_immediate.
> Kernel version is 4.10 but i'm using the speakup code from
> Greg K-H staging-next branch as that's what my patches apply to. Could
> this be the problem?
> 
> I'm investigating it but any hints to speed it up will be helpful.
> 
> Thanks.
> 
> pr 01 12:54:29 sanghar kernel: speakup: loading out-of-tree module taints kernel.
> Apr 01 12:54:29 sanghar kernel: speakup: module is from the staging directory, the quality is unknown, you have been warned.
> Apr 01 12:54:29 sanghar kernel: input: Speakup as /devices/virtual/input/input19
> Apr 01 12:54:29 sanghar kernel: initialized device: /dev/synth, node (MAJOR 10, MINOR 25)
> Apr 01 12:54:29 sanghar kernel: speakup 3.1.6: initialized
> Apr 01 12:54:29 sanghar kernel: synth name on entry is: (null)
> Apr 01 12:54:34 sanghar kernel: speakup_apollo: module is from the staging directory, the quality is unknown, you have been warned.
> Apr 01 12:54:34 sanghar kernel: synth probe
> Apr 01 12:54:34 sanghar kernel: speakup: completed probe
> Apr 01 12:54:34 sanghar kernel: speakup: Going to call tty->ops->write. tty->port=0x18571808
> Apr 01 12:54:34 sanghar kernel: general protection fault: 0000 [#1] PREEMPT SMP
> Apr 01 12:54:34 sanghar kernel: Modules linked in: speakup_apollo(CO) speakup(CO) ctr ccm joydev iTCO_wdt iTCO_vendor_support gpio_ich uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 arc4 videobuf2_core videodev iwldvm media dell_wmi sparse_keymap mac80211 dell_rbtn ppdev dell_laptop dell_smbios dcdbas dell_smm_hwmon coretemp kvm_intel snd_hda_codec_hdmi kvm iwlwifi cfg80211 snd_hda_codec_idt snd_hda_codec_generic irqbypass rfkill psmouse pcspkr i2c_i801 i915 lpc_ich cdc_ether usbnet mii pl2303 cdc_wdm cdc_acm usbserial snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep shpchp drm_kms_helper snd_pcm evdev snd_timer snd input_leds mousedev soundcore mac_hid thermal button battery drm e1000e wmi syscopyarea sysfillrect sysimgblt fb_sys_fops parport_pc i2c_algo_bit parport acpi_als ptp acpi_cpufreq pps_core
> Apr 01 12:54:34 sanghar kernel:  tpm_tis tpm_tis_core kfifo_buf video intel_agp tpm intel_gtt industrialio ac sch_fq_codel ip_tables x_tables ext4 crc16 jbd2 fscrypto mbcache sr_mod cdrom sd_mod hid_generic usbhid hid uhci_hcd serio_raw atkbd libps2 sdhci_pci sdhci led_class ahci libahci libata scsi_mod firewire_ohci mmc_core firewire_core crc_itu_t ehci_pci ehci_hcd usbcore usb_common i8042 serio
> Apr 01 12:54:34 sanghar kernel: CPU: 1 PID: 4806 Comm: speakup Tainted: G         C O    4.10.0-ARCH-00001-g6a2306b7d1e1-dirty #5
> Apr 01 12:54:34 sanghar kernel: Hardware name: Dell Inc. Latitude E4300                  /0D201R, BIOS A13 10/29/2009
> Apr 01 12:54:34 sanghar kernel: task: ffff880086c5c240 task.stack: ffffc900006f0000
> Apr 01 12:54:34 sanghar kernel: RIP: 0010:serial_write+0x1d/0xa0 [usbserial]
> Apr 01 12:54:34 sanghar kernel: RSP: 0018:ffffc900006f3dc8 EFLAGS: 00010282
> Apr 01 12:54:34 sanghar kernel: RAX: ffffffffa065e082 RBX: ffffffffa065f000 RCX: 32006f6c6c6f7061
> Apr 01 12:54:34 sanghar kernel: RDX: 0000000000000001 RSI: ffffc900006f3dfc RDI: ffff88009b11b400
> Apr 01 12:54:34 sanghar kernel: RBP: ffffc900006f3de8 R08: 0000000000000001 R09: 0000000000000363
> Apr 01 12:54:34 sanghar kernel: R10: 00000000000000dc R11: 0000000000000363 R12: ffff880086c5c240
> Apr 01 12:54:34 sanghar kernel: R13: 0000000000000040 R14: ffffffffa065f000 R15: 0000000000000246
> Apr 01 12:54:34 sanghar kernel: FS:  0000000000000000(0000) GS:ffff88011fd00000(0000) knlGS:0000000000000000
> Apr 01 12:54:34 sanghar kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Apr 01 12:54:34 sanghar kernel: CR2: 00007f0934283cc4 CR3: 0000000001a09000 CR4: 00000000000406e0
> Apr 01 12:54:34 sanghar kernel: Call Trace:
> Apr 01 12:54:34 sanghar kernel:  spk_ttyio_out+0x6d/0xb0 [speakup]
> Apr 01 12:54:34 sanghar kernel:  do_catch_up+0x142/0x259 [speakup_apollo]
> Apr 01 12:54:34 sanghar kernel:  speakup_thread+0x222/0x230 [speakup]
> Apr 01 12:54:34 sanghar kernel:  ? wake_atomic_t_function+0x60/0x60
> Apr 01 12:54:34 sanghar kernel:  kthread+0x101/0x140
> Apr 01 12:54:34 sanghar kernel:  ? synth_release+0x20/0x20 [speakup]
> Apr 01 12:54:34 sanghar kernel:  ? kthread_create_on_node+0x60/0x60
> Apr 01 12:54:34 sanghar kernel:  ret_from_fork+0x2c/0x40
> Apr 01 12:54:34 sanghar kernel: Code: 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89 e5 41 56 41 55 41 54 53 4c 8b b7 68 02 00 00 49 8b 06 48 8b 08 <8b> 49 18 85 c9 74 75 41 89 d4 49 89 f5 48 89 fb 66 66 66 66 90
> Apr 01 12:54:34 sanghar kernel: RIP: serial_write+0x1d/0xa0 [usbserial] RSP: ffffc900006f3dc8
> Apr 01 12:54:34 sanghar kernel: ---[ end trace 27b76f7f163ce3c9 ]---


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