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<p><span style="font-size: 12pt;">Thanks Joel!</span></p>
<p><span style="font-size: 12pt;">I said it was crashing, it's actually currently hanging, but it changes. The common thread is it always seems to be in semaphore access functions w/at least one task in printf(). I don't think it's floating point, it looks
like </span><span style="font-size: 12pt;">RTEMS_FLOATING_POINT is passed to rtems_task_create(), but I'll have to do some testing to be sure.</span><br>
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<p><span style="font-size: 12pt;">The current backtrace I get when I </span><span style="font-size: 12pt;">^c after
</span><span style="font-size: 12pt;">it hangs is below.</span><br>
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<p><span style="font-size: 12pt;">Dave</span><br>
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<div><span style="font-family:"Courier New",monospace; font-size:8pt"> CPU 0: Interrupted!</span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">0x6005bad4: 80a08003 cmp %g2, %g3 <_Mutex_Acquire+52></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">CPU 1: Interrupted!</span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">0x6005ff98: 80a04002 cmp %g1, %g2 <_SMP_lock_Acquire+40></span><br>
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<span style="font-family:"Courier New",monospace; font-size:8pt">grmon3> bt cpu0</span><br>
<br>
<span style="font-family:"Courier New",monospace; font-size:8pt">%pc %sp </span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#0 0x6005bad4 0x6047af58 <_Mutex_Acquire+0x34></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#1 0x60047558 0x6047b068 <rtems_termios_imfs_write+0xc></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#2 0x600495a4 0x6047b0e8 <write+0x84></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#3 0x600d558c 0x6047b148 <__sflush_r+0x1bc></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#4 0x600d56f0 0x6047b1a8 <_fflush_r+0x9c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#5 0x600f086c 0x6047b208 <__sbprintf+0xb4></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#6 0x600db280 0x6047b6e8 <printf+0x2c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#7 0x60030f30 0x6047b750 <SCH_ProcessNextEntry+0x1e8></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#8 0x60030fd0 0x6047b7f0 <SCH_ProcessNextSlot+0x94></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#9 0x6003111c 0x6047b850 <SCH_ProcessScheduleTable+0xb4></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#10 0x600314b4 0x6047b8b0 <SCH_AppMain+0x23c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#11 0x60023d28 0x6047b928 <OS_TaskEntryPoint+0xb0></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#12 0x60056d28 0x6047b990 <_Thread_Entry_adaptor_numeric+0x8></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#13 0x60055878 0x6047b9f0 <_Thread_Handler+0xf4></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#14 0x60055784 0x6047ba58 <_Thread_Handler+0></span><br>
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<span style="font-family:"Courier New",monospace; font-size:8pt">grmon3> bt cpu1</span><br>
<br>
<span style="font-family:"Courier New",monospace; font-size:8pt">%pc %sp </span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#0 0x6005ff98 0x60466ba8 <_SMP_lock_Acquire+0x28></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#1 0x60058164 0x60466ba8 <_Thread_queue_Surrender+0x54></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#2 0x6005bd4c 0x60466c10 <_Mutex_Release+0x7c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#3 0x600475fc 0x60466d20 <rtems_termios_imfs_write+0xb0></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#4 0x600495a4 0x60466da0 <write+0x84></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#5 0x600d558c 0x60466e00 <__sflush_r+0x1bc></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#6 0x600d56f0 0x60466e60 <_fflush_r+0x9c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#7 0x600f086c 0x60466ec0 <__sbprintf+0xb4></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#8 0x600db280 0x604673a0 <printf+0x2c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#9 0x60029074 0x60467408 <SENSORS_dumpBytes+0xe8></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#10 0x60029324 0x604674c0 <SENSORS_ProcessSensorPacketSTUP+0xc4></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#11 0x60029764 0x60467528 <SENSORS_ProcessSPWRxPackets+0x210></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#12 0x600287bc 0x604675a0 <SENSORS_AppMain+0x6c></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#13 0x60023d28 0x60467608 <OS_TaskEntryPoint+0xb0></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#14 0x60056d28 0x60467670 <_Thread_Entry_adaptor_numeric+0x8></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#15 0x60055878 0x604676d0 <_Thread_Handler+0xf4></span><br>
<span style="font-family:"Courier New",monospace; font-size:8pt">#16 0x60055784 0x60467738 <_Thread_Handler+0></span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Joel Sherrill <joel@rtems.org><br>
<b>Sent:</b> Friday, April 30, 2021 4:21 PM<br>
<b>To:</b> Dave DeGroote<br>
<b>Cc:</b> users@rtems.org<br>
<b>Subject:</b> Re: Can printf() be made SMP safe?</font>
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<div style=""><span style="">CAUTION:</span> This email originated from outside of the organization.</div>
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<div dir="ltr" class="gmail_attr">On Fri, Apr 30, 2021 at 2:07 PM Dave DeGroote <<a href="mailto:Dave.DeGroote@astrobotic.com">Dave.DeGroote@astrobotic.com</a>> wrote:<br>
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<p><span style="font-size:12pt">Hello,</span></p>
<p><span style="font-size:12pt">I'm trying to get RTEMS running using SMP on a Leon3/gr712rc (2 cores). I have it partially running, but it crashes intermittently on printf's. Can anyone tell me if there's a way to make printf() SMP safe? printf appears to
use termios which uses rtems_mutex_init() and rtems_binary_semaphore_init() which I don't think are SMP safe (but I'm also new to this so I'm not sure).</span></p>
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<div>Those are SMP safe. I suspect you are using the Classic API (e.g. rtems_task_) and by default they do not have floating point enabled. You probably just need to enable the floating point attribute on the task create calls (or for the init task).</div>
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<div><a href="https://docs.rtems.org/branches/master/c-user/task/directives.html#rtems-task-create">https://docs.rtems.org/branches/master/c-user/task/directives.html#rtems-task-create</a></div>
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<div>See configuring a system chapter for the init task setting.</div>
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<div>If you provide the exception, we would know for sure.</div>
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<div>--joel </div>
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