#2296 closed defect (fixed)

powerpc psxualarm01 Failure

Reported by: Joel Sherrill Owned by: Joel Sherrill
Priority: normal Milestone: 4.11
Component: unspecified Version: 4.11
Severity: normal Keywords:
Cc: Blocked By:


Assigning this to Sebastian and politely asking that he tries this on real hardware.

psxualarm01 fails on psim at init.c:95. I added the Status print.

Init's ID is 0x0b010001
Init: ualarm in 1 us
../../../../../../../rtems/c/src/../../testsuites/psxtests/psxualarm/init.c: 96 status == 0

Tracing, sleep() calls nanosleep(). nanosleep() appears to complete that the sleep() didn't block at all and there are 10 seconds remaining. The sleep() call in newlib doesn't appear to have the correct value in its ts variable and ts.tv_sec is 4294 consistent with the value printed.

Can you check this on real PowerPC hardware and see if it happens there? I am concerned that this is something odd beyond a coding bug (which I don't think there is).


Change History (4)

comment:1 Changed on Mar 11, 2015 at 5:29:40 PM by Joel Sherrill

Hmmm... maybe an underflow:

(gdb) p ticks
$5 = 1000
(gdb) n
97 ticks -= executing->Timer.stop_time - executing->Timer.start_time;
99 _Timespec_From_ticks( ticks, rmtp );
108 if ( ticks )
(gdb) p ticks
$6 = 4294967292
(gdb) p *rmtp
$7 = {tv_sec = 4294, tv_nsec = 927296000}
(gdb) p executing->Timer
$8 = {Node = {next = 0x2aa24 <_POSIX_signals_Ualarm_timer>,

previous = 0x2c3f4 <_Watchdog_Ticks_chain>}, state = WATCHDOG_INACTIVE,

initial = 1000, delta_interval = 0, start_time = 300, stop_time = 1304,
routine = 0x14808 <_Thread_Delay_ended>, id = 0, user_data = 0x32a30}

It took 1004 ticks to fire but we were only waiting for 1000.

comment:2 Changed on Mar 11, 2015 at 5:38:41 PM by Joel Sherrill

Owner: changed from Sebastian Huber to Joel Sherrill
Status: newassigned

comment:3 Changed on Mar 11, 2015 at 5:38:53 PM by Joel Sherrill

I have a pending patch and am testing this.

comment:4 Changed on Mar 12, 2015 at 6:34:01 PM by Joel Sherrill <joel.sherrill@…>

Resolution: fixed
Status: assignedclosed

In d937d364af95fec2e9a7a4af4dca6ac7d23397b2/rtems:

posix/src/nanosleep.c: Address issue when delay is longer than desired

This resulted in the elapsed time going below 0 and an arbitrarily large
number returned as the time remaining.

closes #2296.

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