Connection with Smart Z hangs

[Martin Lang]

Ok,

I debugged a little bit and got the impression that the problem is with 
the IRDA driver and not libdivecomputer.

strace gave:
....
gettimeofday({1414947379, 477685}, NULL) = 0
write(2, "INFO: Connect: address=ebd76f01,"..., 40INFO: Connect: 
address=ebd76f01, lsap=1
) = 40
connect(4, {sa_family=AF_IRDA, 
sa_data="\1\0\1o\327\353\0\0\0\0\0\0\0\0"}, 36

But immediately after the connect I got  a Kernel OOPs:

[  348.319858] usbcore: registered new interface driver mcs7780
[  763.753777] IrLAP, no activity on link!
[  765.354442] IrLAP, no activity on link!
[  766.955107] IrLAP, no activity on link!
[  767.319321] BUG: unable to handle kernel NULL pointer dereference 
at           (null)
[  767.319423] IP: [<          (null)>]           (null)
[  767.319482] PGD 3bd506067 PUD 3bd55f067 PMD 0
[  767.319541] Oops: 0010 [#1] SMP
[  767.319584] Modules linked in: mcs7780 irda_usb irda crc_ccitt 
snd_hda_codec_hdmi snd_hda_codec_realtek bnep rfcomm bluetooth 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm eeepc_wmi 
asus_wmi sparse_keymap crct10dif_pclmul crc32_pclmul uvcvideo 
ghash_clmulni_intel snd_hda_intel videobuf2_vmalloc snd_hda_codec 
snd_usb_audio videobuf2_memops videobuf2_core snd_usbmidi_lib ftdi_sio 
videodev usbserial snd_hwdep snd_pcm i915 aesni_intel snd_page_alloc 
aes_x86_64 binfmt_misc lrw gf128mul snd_seq_midi glue_helper 
snd_seq_midi_event snd_rawmidi ablk_helper snd_seq cryptd drm_kms_helper 
mei_me drm serio_raw snd_seq_device mei snd_timer lpc_ich i2c_algo_bit 
snd soundcore wmi video mac_hid parport_pc ppdev lp parport 
nls_iso8859_1 hid_generic usbhid hid ahci r8169 libahci mii
[  767.320541] CPU: 0 PID: 3093 Comm: smart Not tainted 
3.13.0-37-generic #64-Ubuntu
[  767.320621] Hardware name: ASUS All Series/H87M-PRO, BIOS 1101 12/02/2013
[  767.320694] task: ffff8803bd741800 ti: ffff8803bd696000 task.ti: 
ffff8803bd696000
[  767.320787] RIP: 0010:[<0000000000000000>]  [< (null)>]           (null)
[  767.320870] RSP: 0018:ffff8803bd697e00  EFLAGS: 00010206
[  767.320928] RAX: ffffffffa02cf2c0 RBX: ffff8803de716d00 RCX: 
ffff8803bd505f08
[  767.321002] RDX: ffff8803bd505f08 RSI: 0000000000000002 RDI: 
ffff880407867000
[  767.321076] RBP: ffff8803bd697e78 R08: 0000000000000212 R09: 
0000000000000003
[  767.321150] R10: 0000000000000004 R11: 0000000000000005 R12: 
ffff8803bd697e90
[  767.321224] R13: ffff880407867000 R14: 0000000000000000 R15: 
0000000000000024
[  767.321300] FS:  0000000000000000(0000) GS:ffff88041fa00000(0063) 
knlGS:00000000f75f5940
[  767.321384] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[  767.321444] CR2: 0000000000000000 CR3: 00000003bd665000 CR4: 
00000000001407f0
[  767.321518] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[  767.321592] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
[  767.321665] Stack:
[  767.321689]  ffffffffa02c75c6 0000000000000000 ffffffff810789db 
0000000000000000
[  767.321780]  00000002bd697e58 0000000000000000 ffff8803bd741800 
ffffffff810aafd0
[  767.321870]  ffff8803bd697e40 ffff8803bd697e40 ffff8803de716d00 
0000000000000024
[  767.321960] Call Trace:
[  767.322008]  [<ffffffffa02c75c6>] ? irda_connect+0x156/0x480 [irda]
[  767.322083]  [<ffffffff810789db>] ? ptrace_stop+0x1cb/0x2c0
[  767.322150]  [<ffffffff810aafd0>] ? prepare_to_wait_event+0x100/0x100
[  767.322223]  [<ffffffff8160a6a7>] SYSC_connect+0xe7/0x120
[  767.322286]  [<ffffffff81079f0f>] ? ptrace_notify+0x5f/0xc0
[  767.322348]  [<ffffffff8160b3fe>] SyS_connect+0xe/0x10
[  767.322408]  [<ffffffff81642700>] compat_sys_socketcall+0x1f0/0x260
[  767.322479]  [<ffffffff8173152c>] sysenter_dispatch+0x7/0x21
[  767.322540] Code:  Bad RIP value.
[  767.322585] RIP  [<          (null)>]           (null)
[  767.322643]  RSP <ffff8803bd697e00>
[  767.322681] CR2: 0000000000000000
[  767.348054] ---[ end trace e742aca706087bcd ]---


I will try to debug a little bit more.

Thank you

On 26.10.2014 20:38, Jef Driesen wrote:
> On 22-10-14 12:10, Martin Lang wrote:
>> since my Windows machine stopped working and I cannot read out my Uwatec
>> Smart Z computer anymore on this computer, I tried doing directly with
>> my Ubuntu workstation. Unfortunately subsurface hangs always during
>> import of the dive logs. So I tried the test application from
>> libdivecomputer.
>>
>>   >martin at Asterix:~/Downloads$ ./smart /dev/ttyS1
>>   >DATETIME 2014-10-22T09:19:17Z (1413969557)
>>   >VERSION 0.5.0-devel (61e9847196b4e7f4e2c80e47dd6cd7070c9c4418)
>>   >uwatec_smart_device_open
>>   >INFO: Discover: address=ebd76f01, name=Aladin Smart Z, charset=00,
>> hints=8000
>>   >INFO: Connect: address=ebd76f01, lsap=1
>>
>> After that the window freezes and the smart application hangs. The
>> system is an Ubuntu 14.10 system.
>>
>> Any help is highly appreciated.
>
> I've no idea what's going wrong here. Can you try to run under strace 
> to see whether it's still busy in some syscall? Running under a 
> debugger should work too, if you're familiar doing that.
>
> Jef
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