[Ovmsdev] version 3.2.007: Crash on boot

Michael Balzer dexter at expeedo.de
Thu Dec 12 18:17:35 HKT 2019


Last line of a2l was missing:

#!/bin/bash
elf=~/esp/Open-Vehicle-Monitoring-System-3/vehicle/OVMS.V3/build/ovms3.elf
for adr in $* ; do
  if [[ "$adr" =~ "elf" ]] ; then
    elf="$adr"
  else
    cmd+=" -ex 'l *${adr/:*/}'"
  fi
done
cmd+=" -ex 'q'"
echo "Using elf file: $elf"
eval xtensa-esp32-elf-gdb -batch $elf $cmd 2>/dev/null



Am 12.12.19 um 11:12 schrieb Michael Balzer:
> Mark,
>
> 1) maybe I missed posting my later version of a2l, which automatically strips the stack pointers from the ":" address syntax so you can copy&paste the USB
> output. Here it is:
>
> #!/bin/bash
> elf=~/esp/Open-Vehicle-Monitoring-System-3/vehicle/OVMS.V3/build/ovms3.elf
> for adr in $* ; do
>   if [[ "$adr" =~ "elf" ]] ; then
>     elf="$adr"
>   else
>     cmd+=" -ex 'l *${adr/:*/}'"
>   fi
> done
> cmd+=" -ex 'q'"
> echo "Using elf file: $elf"
>
>
> 2) You're right, the bug is tx_frame with null origin overwriting body.bus in the union. I didn't notice that when checking Marko's submission.
>
> tx_frame is a copy of the last frame given to the bus for transmission. The queue msg is gone when the TX done IRQ comes in, and Marko needed a copy of the
> frame the TX IRQ relates to. I asked him (see PR discussion), he checked and confirmed that all TX is done sequentially, so a single buffer is sufficient.
>
> Swapping the lines would work. The frame.origin also shouldn't be null, but the handler should tolerate that. …oops, tx_frame also doesn't get initialized in
> the canbus constructor, so there's also potentially garbage in tx_frame if due to some bug a TX IRQ is generated or processed without a previous tx.
>
> I'll do the fixes… and also rename tx_frame to m_tx_frame for consistency.
>
> Regards,
> Michael
>
>
> Am 12.12.19 um 01:20 schrieb Mark Webb-Johnson:
>> Two issues:
>>
>> _*1] A2L*_
>>
>> My a2l is this:
>>
>>     #!/bin/bash
>>     elf=3.2.007.ovms3.elf
>>     for adr in $* ; do
>>       if [[ "$adr" =~ "elf" ]] ; then
>>         elf="$adr"
>>       else
>>         cmd+=" -ex 'l *$adr'"
>>       fi
>>     done
>>     cmd+=" -ex 'q'"
>>     echo "Using elf file: $elf"
>>     echo "xtensa-esp32-elf-gdb -batch $elf $cmd"
>>     eval xtensa-esp32-elf-gdb -batch $elf $cmd 2>/dev/null #| grep "^0x.* is in "
>>
>>
>> When I run it, I get:
>>
>>     $ a2l 3.2.007.ovms3.elf 0x400d5e4c:0x3ffc5c40 0x7ffffffd:0x3ffc5c90
>>     Using elf file: 3.2.007.ovms3.elf
>>     xtensa-esp32-elf-gdb -batch 3.2.007.ovms3.elf  -ex 'l *0x400d5e4c:0x3ffc5c40' -ex 'l *0x7ffffffd:0x3ffc5c90' -ex ‘q'
>>
>>
>> And a manual run gives:
>>
>>     $ xtensa-esp32-elf-gdb -batch 3.2.007.ovms3.elf  -ex 'l *0x400d5e4c:0x3ffc5c40' -ex 'l *0x7ffffffd:0x3ffc5c90' -ex 'q'
>>     Junk at end of line specification.
>>
>>     $ xtensa-esp32-elf-gdb 3.2.007.ovms3.elf
>>     GNU gdb (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a) 7.10
>>     (gdb) l *0x400d5e4c:0x3ffc5c40
>>     Junk at end of line specification.
>>     (gdb) l *0x7ffffffd:0x3ffc5c90
>>     (gdb) quit
>>
>>
>> _*2] Frame origin*_
>>
>> Regarding the CAN_txcallback, I think you are correct. And both generators of that message set the frame correctly. So my initial thought was that it is
>> either a memory corruption, or somewhere else sending a frame with garbage data.
>>
>> I do see this technique used in both the mcp2515 and esp32can drivers:
>>
>>     msg.body.bus = me;
>>     msg.body.frame = me->tx_frame;
>>
>>
>> I don’t normally just copy structures over like that. I memcpy() them, but I guess it must work. However, as our CAN_queue_msg_t is a union of CAN_frame_t
>> (frame, with first member of the structure a canbus*) and 'canbus* bus’, that is a little worrying. It seems that the msg.body.bus will get overwritten with
>> whatever is in msg.body.frame.origin. I can’t see anywhere that tx_frame.origin is set - which is scary because that would mean it is always random junk.
>>
>> Maybe it works if tx_frame.origin is set to the bus before anything else, but not in Greg’s circumstances where something else arrives first. Perhaps related
>> to obd2ecu? I only see tx_frame set in can.cpp canbus::Write. I don’t really understand the tx_frame approach at all, and why the frame is just not passed on
>> the queue.
>>
>>     // CAN Frame
>>     // Note: Take care changing this structure, as it is a union with
>>     // CAN_log_message_t and position of 'origin' is fixed.
>>     struct CAN_frame_t
>>       {
>>       canbus*     origin;                   // Origin of the frame
>>       CanFrameCallback * callback;          // Frame-specific callback. Is called when this frame is successfully sent (or sending failed)
>>       CAN_FIR_t   FIR;                      // Frame information record
>>       uint32_t    MsgID;                    // Message ID
>>       union
>>         {
>>         uint8_t   u8[8];                    // Payload byte access
>>         uint32_t  u32[2];                   // Payload u32 access (Att: little endian!)
>>         uint64_t  u64;                      // Payload u64 access (Att: little endian!)
>>         } data;
>>
>>       esp_err_t Write(canbus* bus=NULL, TickType_t maxqueuewait=0);  // bus: NULL=origin
>>       };
>>
>>     // CAN message
>>     typedef struct
>>       {
>>       CAN_queue_type_t type;
>>       union
>>         {
>>         CAN_frame_t frame;  // CAN_frame
>>         canbus* bus;
>>         } body;
>>       } CAN_queue_msg_t;
>>
>>
>> This approach seems to date back to the swcan support merge (f94ae5a1b).
>>
>> Should we swap around, and set the msg.body.bus after msg.body.frame? Or am I missing something…
>>
>> Regards, Mark.
>>
>>> On 12 Dec 2019, at 2:29 AM, Michael Balzer <dexter at expeedo.de <mailto:dexter at expeedo.de>> wrote:
>>>
>>> Mark,
>>>
>>> good example why not to use addr2line: I think that result is wrong. a2l uses gdb which gives:
>>>
>>> balzer at leela:~/esp/Open-Vehicle-Monitoring-System-3/vehicle/OVMS.V3> a2l tmp/3.2.007.ovms3.elf 0x400d5e4c:0x3ffc5c40 0x7ffffffd:0x3ffc5c90
>>> Using elf file: tmp/3.2.007.ovms3.elf
>>> 0x400d5e4c is in CAN_rxtask(void*) (/home/openvehicles/build/Open-Vehicle-Monitoring-System-3.1/vehicle/OVMS.V3/components/can/src/can.cpp:730).
>>> 725                  me->IncomingFrame(&msg.body.frame);
>>> 726                } while (loop);
>>> 727              break;
>>> 728              }
>>> 729            case CAN_txcallback:
>>> 730              msg.body.bus->TxCallback(&msg.body.frame, true);
>>> 731              break;
>>> 732            case CAN_txfailedcallback:
>>> 733              msg.body.bus->TxCallback(&msg.body.frame, false);
>>> 734              msg.body.bus->LogStatus(CAN_LogStatus_Error);
>>>
>>> …and that actually makes sense and matches the register dump.
>>>
>>> If I read the gdb disassembly correctly, A10 = msg.body.bus, so Greg's got a CAN_txcallback msg without a bus.
>>>
>>> Hardening the rxtask against null here would probably avoid the crash, but I don't see yet how that could be possible.
>>> Both esp32can and mcp2515 set the bus field to their object addresses, which cannot be null.
>>>
>>> Regards,
>>> Michael
>>>
>>>
>>> Am 11.12.19 um 13:45 schrieb Mark Webb-Johnson:
>>>> Can’t get a2l working at the moment. The addr2line gives:
>>>>
>>>>     addr2line -e 3.2.007.ovms3.elf 0x400d5e4c:0x3ffc5c40 0x7ffffffd:0x3ffc5c90
>>>>     /home/openvehicles/build/Open-Vehicle-Monitoring-System-3.1/vehicle/OVMS.V3/components/can/src/can.cpp:551
>>>>
>>>>
>>>> That is:
>>>>
>>>>     void canbus::LogInfo(CAN_log_type_t type, const char* text)
>>>>       {
>>>>       MyCan.LogInfo(this, type, text);    <—— HERE
>>>>       }
>>>>
>>>>
>>>> ELF is at:
>>>>
>>>>     http://api.openvehicles.com/firmware/ota/v3.2/main/3.2.007.ovms3.elf
>>>>
>>>>
>>>> Regards, Mark.
>>>>
>>>>> On 11 Dec 2019, at 5:20 PM, Michael Balzer <dexter at expeedo.de <mailto:dexter at expeedo.de>> wrote:
>>>>>
>>>>> Mark,
>>>>>
>>>>> Greg uses your build, the crash point seems to be consistent, can you post the a2l on this?
>>>>>
>>>>> Regards,
>>>>> Michael
>>>>>
>>>>> PS: Greg, would you mind switching to EAP to beta test future releases?
>>>>>
>>>>>
>>>>> Am 11.12.19 um 04:33 schrieb Greg D.:
>>>>>> Hi folks,
>>>>>>
>>>>>> Well, the module updated to 3.2.007 last night.  I just checked on it,
>>>>>> and it appears that it didn't exactly survive.  Crashed while running
>>>>>> the autoconfig script.  Log with two cycles attached.
>>>>>>
>>>>>> I tried renaming the /store/events directory to /store/was_events since
>>>>>> it seems like Duktape was getting in the way, but that didn't resolve
>>>>>> the crash.  I manually enabled wifi so I could manage the module, and
>>>>>> moved it back to 3.2.005 from the other partition.  Seems stable again.
>>>>>>
>>>>>> The car is going into the Service Center tomorrow (the perennial issue
>>>>>> with 1146 alerts), so I need to have the module stable so that I can
>>>>>> keep an eye on it.  Going to leave it on 3.2.005 for now, unless someone
>>>>>> has a quick fix in the next few hours...
>>>>>>
>>>>>> Otherwise, any ideas for troubleshooting after I get the car back back
>>>>>> (hopefully end of day)?
>>>>>>
>>>>>> Greg
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> OvmsDev mailing list
>>>>>> OvmsDev at lists.openvehicles.com
>>>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>>>
>>>>>
>>>>> -- 
>>>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>>>> _______________________________________________
>>>>> OvmsDev mailing list
>>>>> OvmsDev at lists.openvehicles.com <mailto:OvmsDev at lists.openvehicles.com>
>>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>>
>>>>
>>>> _______________________________________________
>>>> OvmsDev mailing list
>>>> OvmsDev at lists.openvehicles.com
>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>
>>> -- 
>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>> _______________________________________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.openvehicles.com <mailto:OvmsDev at lists.openvehicles.com>
>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>>
>> _______________________________________________
>> OvmsDev mailing list
>> OvmsDev at lists.openvehicles.com
>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com
> http://lists.openvehicles.com/mailman/listinfo/ovmsdev

-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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