On 14/05/2021 03:09, Dave DeGroote wrote:
I'm still beating my head against this so I wrote a simple RTEMS only
test to narrow it down and the problem is still occurring. Sometimes it
crashes, hangs, or runs fine, depending on the number of RTEMS objects
created (it sometimes works with fewer objects and fails with more).
If it crashes depending on the number of object, then this still looks
like a general memory corruption which depends on the memory layout.
Which RTEMS version do you use? Did enabling RTEMS_DEBUG help to get
more information.
I checked your example program on another target and it works fine. I
didn't see anything obviously wrong in the example.
- The code starts two tasks with printf() loops.
- To start, the printf()'s do not overlap - this always works
- The code then switches to fast overlapping printf()'s where it fails
(depending on the #of objects).
The compile command, code, and results are below.
Thanks for any help or insight!
Compile command (gcc version 7.2.0 (Cobham Gaisler RCC 1.3-rc7) ):
sparc-gaisler-rtems5-gcc -Wall -g -O2 -Werror -mcpu=leon3 -mfix-gr712rc
-qbsp=gr712rc_smp -o smp_test smp_test.c
Results: fails with 20 semaphores:
|gncsim||@gncsim||:~/grmon-pro-||3.0||.||9||/linux/bin64$ sudo ./grmon
-ftdi -log /tmp/grmon-log.log -e ||"load
~/lander/flat_sat/DaveD/smp_test; run"||-u|
|||GRMON LEON debug monitor v3.||0.9| |64||-bit pro version|
||
|||Copyright (C) ||2018| |Cobham Gaisler - All rights reserved.|
|||For latest updates, go to http:||//www.gaisler.com/|
|||Comments or bug-reports to support||@gaisler||.com|
|JTAG chain (||1||): GR712RC|
|Device ID: ||0x712|
|||GRLIB build version: ||3696|
|||Detected system: GR712RC|
|||Detected frequency: ||80| |MHz|
||
|||Component Vendor|
|||LEON3FT SPARC V8 Processor Cobham Gaisler|
<... snip ...>
||
|||Timer Unit with Latches Cobham Gaisler|
||
|||Use command ||'info sys'| |to print a detailed report of attached cores|
|||40000000| |.text ||191||.7kB / ||191||.7kB [===============>] ||100||%|
|||4002FED0 .rtemsroset 96B
[===============>] ||100||%|
|||40031F40 .data ||5||.6kB / ||5||.6kB [===============>] ||100||%|
|||Total size: ||197||.38kB (||774||.38kbit/s)|
|||Entry point ||0x40000000|
|||Image /home/gncsim/lander/flat_sat/DaveD/smp_test loaded|
|t1a:||0| |<||0||>|
|t2a:||1| |[||0||]|
|t1a:||0| |<||1||>|
|t2a:||1| |[||1||]|
|t1a:||0| |<||2||>|
|t2a:||1| |[||2||]|
|t2b:||1| |[||0||]|
|t1b:||0| |<||0||>|
|t2b:||1| |[||1||]|
||
|||CPU ||0||: Unknown watchpoint hit|
|||0x400217b4||: ba100015 mov %l5, %i5 <_vfprintf_r+||316||>|
|||CPU ||1||: IU exception (tt = ||0x2B||, data store error)|
|||0x40011818||: ||96100001| |mov %g1, %o3
<_Thread_queue_Queue_enqueue+||108||>|
||
|grmon3> bt cpu0|
||
|||%pc %sp|
|||#||0| |0x400217b4| |0x4003eb60| |<_vfprintf_r+||0x13c||>|
|||#||1| |0x4001e1ec| |0x4003ed38| |<printf+||0x2c||>|
|||#||2| |0x40001334| |0x4003eda0| |<task1+||0x68||>|
|||#||3| |0x40010084| |0x4003ee00| |<_Thread_Entry_adaptor_numeric+||0x8||>|
|||#||4| |0x4000ea8c| |0x4003ee60| |<_Thread_Handler+||0x60||>|
|||#||5| |0x4000ea2c| |0x4003eec0| |<_Thread_Handler+||0||>|
||
|grmon3> bt cpu1|
||
|||%pc %sp|
|||#||0| |0x40011818| |0x4003fae0| |<_Thread_queue_Queue_enqueue+||0x6c||>|
|||#||1| |0x40010c00| |0x4003fb40| |<_Thread_queue_Enqueue+||0x80||>|
|||#||2| |0x4002ce60| |0x4003fba8| |<clock_nanosleep.part.||4||+||0x134||>|
|||#||3| |0x4002cf34| |0x4003fcd8| |<nanosleep+||0x10||>|
|||#||4| |0x400214c4| |0x4003fd38| |<usleep+||0x48||>|
|||#||5| |0x400013dc| |0x4003fda8| |<task2+||0x70||>|
|||#||6| |0x40010084| |0x4003fe08| |<_Thread_Entry_adaptor_numeric+||0x8||>|
|||#||7| |0x4000ea8c| |0x4003fe68| |<_Thread_Handler+||0x60||>|
|||#||8| |0x4000ea2c| |0x4003fec8| |<_Thread_Handler+||0||>|
||
|grmon3>|
There seems to be a data store error in usleep(). This function uses a
global object: _Nanosleep_Pseudo_queue. I would check the state of this
object during crash.
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