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t5000-valgrind test fails on Jetson Nano #3808

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javawolfpack opened this issue Aug 1, 2021 · 5 comments · Fixed by #3809
Closed

t5000-valgrind test fails on Jetson Nano #3808

javawolfpack opened this issue Aug 1, 2021 · 5 comments · Fixed by #3809

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@javawolfpack
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So have flux-security & flux-core building and installing fine on the Jetson Nano 4GB model B01. I've tried an official Jetson Ubuntu image (18.04) and a custom image now running Ubuntu 20.04.2 LTS.

Using the manual verbose run method mentioned in #3093 get the following output. This is the only error I got the first time I ran make check; however, now subsequent runs the check hangs on the test python/t0007-watchers which I'm unsure what's causing that or how to run that one manually.

$ flux ./t5000-valgrind.t -d -v
sharness: loading extensions from /home/user/flux-core/t/sharness.d/01-setup.sh
sharness: loading extensions from /home/user/flux-core/t/sharness.d/flux-sharness.sh
expecting success:
	run_timeout 300 \
	flux start -s ${VALGRIND_NBROKERS} \
		--test-exit-timeout=120 \
		--wrap=libtool,e,${VALGRIND} \
		--wrap=--tool=memcheck \
		--wrap=--leak-check=full \
		--wrap=--gen-suppressions=all \
		--wrap=--trace-children=no \
		--wrap=--child-silent-after-fork=yes \
		--wrap=--num-callers=30 \
		--wrap=--leak-resolution=med \
		--wrap=--error-exitcode=1 \
		--wrap=--suppressions=$VALGRIND_SUPPRESSIONS \
		 ${VALGRIND_WORKLOAD}

==1705646== Memcheck, a memory error detector
==1705646== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1705646== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==1705646== Command: /home/user/flux-core/src/broker/.libs/flux-broker --setattr=rundir=/tmp/flux-kU6Va1
==1705646==
==1705645== Memcheck, a memory error detector
==1705645== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1705645== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==1705645== Command: /home/user/flux-core/src/broker/.libs/flux-broker --setattr=rundir=/tmp/flux-kU6Va1 /home/user/flux-core/t/valgrind/valgrind-workload.sh
==1705645==
==1705645== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==1705645==    at 0x4BDFE38: epoll_ctl (syscall-template.S:78)
==1705645==    by 0x48B37EF: epoll_modify (ev_epoll.c:96)
==1705645==    by 0x48B4F57: fd_reify (ev.c:2166)
==1705645==    by 0x48B4F57: ev_run (ev.c:3677)
==1705645==    by 0x48B4F57: ev_run (ev.c:3623)
==1705645==    by 0x48824FF: flux_reactor_run (reactor.c:126)
==1705645==    by 0x1113BF: main (broker.c:449)
==1705645==  Address 0x1ffefff22c is on thread 1's stack
==1705645==  in frame #1, created by epoll_modify (ev_epoll.c:72)
==1705645==
{
   <insert_a_suppression_name_here>
   Memcheck:Param
   epoll_ctl(event)
   fun:epoll_ctl
   fun:epoll_modify
   fun:fd_reify
   fun:ev_run
   fun:ev_run
   fun:flux_reactor_run
   fun:main
}
==1705646== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==1705646==    at 0x4BDFE38: epoll_ctl (syscall-template.S:78)
==1705646==    by 0x48B37EF: epoll_modify (ev_epoll.c:96)
==1705646==    by 0x48B4F57: fd_reify (ev.c:2166)
==1705646==    by 0x48B4F57: ev_run (ev.c:3677)
==1705646==    by 0x48B4F57: ev_run (ev.c:3623)
==1705646==    by 0x48824FF: flux_reactor_run (reactor.c:126)
==1705646==    by 0x1113BF: main (broker.c:449)
==1705646==  Address 0x1ffefff26c is on thread 1's stack
==1705646==  in frame #1, created by epoll_modify (ev_epoll.c:72)
==1705646==
{
   <insert_a_suppression_name_here>
   Memcheck:Param
   epoll_ctl(event)
   fun:epoll_ctl
   fun:epoll_modify
   fun:fd_reify
   fun:ev_run
   fun:ev_run
   fun:flux_reactor_run
   fun:main
}
FLUX_URI=local:///tmp/flux-kU6Va1/local-0
Running job
f9fiDUJj submitted
f9yunexF submitted
fAMdx8VM submitted
fAsiuZBD submitted
fBNXjbmq submitted
fBrxKq9H submitted
fCdgnAJj submitted
fDPGX3nf submitted
fED7qsLB submitted
fEwrfAWj submitted
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
f9fiDUJj complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
f9yunexF complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fAMdx8VM complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fAsiuZBD complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fBNXjbmq complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fBrxKq9H complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fCdgnAJj complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fDPGX3nf complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fED7qsLB complete
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmn
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
fEwrfAWj complete
Running job-cancel
++ flux jobspec srun sleep 60
++ flux job submit
+ id=fKQ6p4cX
+ flux job wait-event fKQ6p4cX start
1627835184.583431 start
+ flux job cancel fKQ6p4cX
+ flux job wait-event fKQ6p4cX clean
1627835185.672612 clean
Running job-info
++ flux job submit
++ flux jobspec srun -t 1 -n 1 /bin/true
+ id=fLcvwkW3
+ flux job attach fLcvwkW3
+ flux job info fLcvwkW3 eventlog jobspec R
+ flux job list -A
{"id": 746888101888, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835186.3286908, "state": 64, "name": "true", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 1627835246.6190383, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835186.3286908, "t_run": 1627835186.9638536, "t_cleanup": 1627835188.3977354, "t_inactive": 1627835188.9547589, "annotations": {"sched": {"resource_summary": "rank0/core0"}}}
{"id": 700398436352, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835183.5584121, "state": 64, "name": "sleep", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 0.0, "success": false, "exception_occurred": true, "exception_severity": 0, "exception_type": "cancel", "exception_note": "", "result": 4, "waitstatus": 15, "t_depend": 1627835183.5584121, "t_run": 1627835184.1314242, "t_cleanup": 1627835184.9496472, "t_inactive": 1627835185.6726122, "annotations": {"sched": {"resource_summary": "rank0/core0"}}}
{"id": 530898223104, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835173.4553568, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "1", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835173.4553568, "t_run": 1627835175.2928183, "t_cleanup": 1627835179.3111057, "t_inactive": 1627835180.1624877, "annotations": {"sched": {"resource_summary": "rank1/core1"}}}
{"id": 502846717952, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835171.7833271, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835171.7833271, "t_run": 1627835173.5692499, "t_cleanup": 1627835179.2315712, "t_inactive": 1627835180.0472727, "annotations": {"sched": {"resource_summary": "rank0/core0"}}}
{"id": 471439769600, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835169.9108646, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "1", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835169.9108646, "t_run": 1627835171.6699777, "t_cleanup": 1627835177.0811205, "t_inactive": 1627835178.2140799, "annotations": {"sched": {"resource_summary": "rank1/core0"}}}
{"id": 442834616320, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835168.2066441, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835168.2066441, "t_run": 1627835170.143157, "t_cleanup": 1627835176.908953, "t_inactive": 1627835177.9105332, "annotations": {"sched": {"resource_summary": "rank0/core3"}}}
{"id": 413474488320, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835166.456645, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "1", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835166.456645, "t_run": 1627835168.5699501, "t_cleanup": 1627835174.508873, "t_inactive": 1627835176.4670329, "annotations": {"sched": {"resource_summary": "rank1/core2"}}}
{"id": 394818224128, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835165.3436477, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835165.3436477, "t_run": 1627835166.6062496, "t_cleanup": 1627835173.9754188, "t_inactive": 1627835175.5564713, "annotations": {"sched": {"resource_summary": "rank0/core2"}}}
{"id": 375910301696, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835164.2168148, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "1", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835164.2168148, "t_run": 1627835165.6057014, "t_cleanup": 1627835171.3448763, "t_inactive": 1627835173.2703073, "annotations": {"sched": {"resource_summary": "rank1/core1"}}}
{"id": 356163518464, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835163.0402932, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835163.0402932, "t_run": 1627835164.3542206, "t_cleanup": 1627835170.6454177, "t_inactive": 1627835172.3150239, "annotations": {"sched": {"resource_summary": "rank0/core1"}}}
{"id": 341902884864, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835162.1900585, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "1", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835162.1900585, "t_run": 1627835163.2179701, "t_cleanup": 1627835168.3095942, "t_inactive": 1627835170.393688, "annotations": {"sched": {"resource_summary": "rank1/core0"}}}
{"id": 329957507072, "userid": 1000, "urgency": 16, "priority": 16, "t_submit": 1627835161.4872923, "state": 64, "name": "lptest", "ntasks": 1, "nnodes": 1, "ranks": "0", "nodelist": "nano1", "expiration": 0.0, "success": true, "exception_occurred": false, "result": 1, "waitstatus": 0, "t_depend": 1627835161.4872923, "t_run": 1627835162.4698594, "t_cleanup": 1627835168.0936608, "t_inactive": 1627835169.7731926, "annotations": {"sched": {"resource_summary": "rank0/core0"}}}
Running job-wait
++ flux mini submit --flags waitable /bin/true
+ id=fNBfynvB
+ flux job wait fNBfynvB
++ flux mini submit --flags waitable /bin/true
+ id=fPHjEm8K
+ flux job wait-event fPHjEm8K clean
1627835194.529114 clean
==1705646==
==1705646== HEAP SUMMARY:
==1705646==     in use at exit: 238,405 bytes in 3,291 blocks
==1705646==   total heap usage: 96,363 allocs, 93,072 frees, 2,901,280,901 bytes allocated
==1705646==
==1705646== LEAK SUMMARY:
==1705646==    definitely lost: 0 bytes in 0 blocks
==1705646==    indirectly lost: 0 bytes in 0 blocks
==1705646==      possibly lost: 0 bytes in 0 blocks
==1705646==    still reachable: 238,229 bytes in 3,289 blocks
==1705646==         suppressed: 176 bytes in 2 blocks
==1705646== Reachable blocks (those to which a pointer was found) are not shown.
==1705646== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==1705646==
==1705646== Use --track-origins=yes to see where uninitialised values come from
==1705646== For lists of detected and suppressed errors, rerun with: -s
==1705646== ERROR SUMMARY: 438 errors from 1 contexts (suppressed: 1 from 1)
flux-start: 1 (pid 1705646) exited with rc=1
==1705645==
==1705645== HEAP SUMMARY:
==1705645==     in use at exit: 251,200 bytes in 3,325 blocks
==1705645==   total heap usage: 892,601 allocs, 889,276 frees, 5,678,169,955 bytes allocated
==1705645==
==1705645== LEAK SUMMARY:
==1705645==    definitely lost: 0 bytes in 0 blocks
==1705645==    indirectly lost: 0 bytes in 0 blocks
==1705645==      possibly lost: 0 bytes in 0 blocks
==1705645==    still reachable: 251,024 bytes in 3,323 blocks
==1705645==         suppressed: 176 bytes in 2 blocks
==1705645== Reachable blocks (those to which a pointer was found) are not shown.
==1705645== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==1705645==
==1705645== Use --track-origins=yes to see where uninitialised values come from
==1705645== For lists of detected and suppressed errors, rerun with: -s
==1705645== ERROR SUMMARY: 3146 errors from 1 contexts (suppressed: 1 from 1)
flux-start: 0 (pid 1705645) exited with rc=1
not ok 1 - valgrind reports no new errors on 2 broker run
#
#		run_timeout 300 \
#		flux start -s ${VALGRIND_NBROKERS} \
#			--test-exit-timeout=120 \
#			--wrap=libtool,e,${VALGRIND} \
#			--wrap=--tool=memcheck \
#			--wrap=--leak-check=full \
#			--wrap=--gen-suppressions=all \
#			--wrap=--trace-children=no \
#			--wrap=--child-silent-after-fork=yes \
#			--wrap=--num-callers=30 \
#			--wrap=--leak-resolution=med \
#			--wrap=--error-exitcode=1 \
#			--wrap=--suppressions=$VALGRIND_SUPPRESSIONS \
#			 ${VALGRIND_WORKLOAD}
#

# failed 1 among 1 test(s)
1..1

Few system details in case they're useful:

Linux version 4.9.201-tegra (buildbrain@mobile-u64-5294-d8000) (gcc version 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701] (Linaro GCC 7.3-2018.05) ) #1 SMP PREEMPT Fri Feb 19 08:40:32 PST 2021

Python 3.8.10
Valgrind 3.15.0
gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
g++ (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
GNU Make 4.2.1 Built for aarch64-unknown-linux-gnu
Flux-Security v0.4.0
Flux-Core v0.28.0
@garlick
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garlick commented Aug 1, 2021

Ah thanks for reporting this Bryan. Since the failure is down in libev (which is vendored in flux-core) probably we just need to add the recommended suppression. It's not the first one for libev. Could you verify that this shuts up the failure?

diff --git a/t/valgrind/valgrind.supp b/t/valgrind/valgrind.supp
index 00909e353..d963ab408 100644
--- a/t/valgrind/valgrind.supp
+++ b/t/valgrind/valgrind.supp
@@ -123,3 +123,13 @@
    fun:hwloc_topology_load
    ...
 }
+{
+   <issue_3808>
+   Memcheck:Param
+   epoll_ctl(event)
+   fun:epoll_ctl
+   fun:epoll_modify
+   fun:fd_reify
+   fun:ev_run
+   ...
+}

On the other failure, if you have time, please open another bug. The way to run the python tests standalone is e.g.

$ cd t
$ ../src/cmd/flux python python/t0007-watchers.py
TAP version 13
ok 1 __main__.TestFdWatcher.test_fd_watcher
ok 2 __main__.TestFdWatcher.test_fd_watcher_exception
ok 3 __main__.TestSignal.test_s0_signal_watcher_add
ok 4 __main__.TestSignal.test_s1_signal_watcher_remove
ok 5 __main__.TestSignal.test_signal_watcher
ok 6 __main__.TestSignal.test_signal_watcher_exception
ok 7 __main__.TestSignal.test_signal_watcher_invalid
ok 8 __main__.TestTimer.test_msg_watcher_bytes
ok 9 __main__.TestTimer.test_msg_watcher_unicode
ok 10 __main__.TestTimer.test_s1_0_timer_add
ok 11 __main__.TestTimer.test_s1_1_timer_remove
ok 12 __main__.TestTimer.test_timer_add_negative
ok 13 __main__.TestTimer.test_timer_callback_exception
ok 14 __main__.TestTimer.test_timer_with_reactor
1..14

@javawolfpack
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Ah thanks for reporting this Bryan. Since the failure is down in libev (which is vendored in flux-core) probably we just need to add the recommended suppression. It's not the first one for libev. Could you verify that this shuts up the failure?

diff --git a/t/valgrind/valgrind.supp b/t/valgrind/valgrind.supp

I get this when running that command:

$ diff --git a/t/valgrind/valgrind.supp b/t/valgrind/valgrind.supp
diff: unrecognized option '--git'
diff: Try 'diff --help' for more information

Everything seems to indicate that I should run the following after committing the state of my code and it does that:

$ git diff t/valgrind/valgrind.supp
$

But it yields no output. Is the suppression beyond v0.28.0 of flux-core?

@javawolfpack
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I'm going to redownload and build a fresh copy of v0.28.0 and see if the tests hang again before submitting that ticket. Running the python test manually ran fine and I get that same output.

@garlick
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garlick commented Aug 1, 2021

Oops, sorry, that's a patch you could cut and paste into a file, say supp.diff, then run

$ patch -p1 <supp.diff

from the top level of the flux-core source tree.

@javawolfpack
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Patch applied, now shows this in the output:

...
make[2]: Nothing to be done for 't5000-valgrind.t'.
...
PASS: t5000-valgrind.t 1 - valgrind reports no new errors on 2 broker run
...

So guess that's a success in squashing the failure for that test. Thanks, will let you know if it still hangs again and submit a new ticket if it does.

garlick added a commit to garlick/flux-core that referenced this issue Aug 1, 2021
@garlick
testsuite: add valgrind suppression
2789b59 
Problem: a new valgrind test failure was encountered on aarch64,
Ubuntu 20.04.2 LTS and also the official Jetson Ubuntu 18.04:

==1705645== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==1705645==    at 0x4BDFE38: epoll_ctl (syscall-template.S:78)
==1705645==    by 0x48B37EF: epoll_modify (ev_epoll.c:96)
==1705645==    by 0x48B4F57: fd_reify (ev.c:2166)
==1705645==    by 0x48B4F57: ev_run (ev.c:3677)
==1705645==    by 0x48B4F57: ev_run (ev.c:3623)
==1705645==    by 0x48824FF: flux_reactor_run (reactor.c:126)
==1705645==    by 0x1113BF: main (broker.c:449)
==1705645==  Address 0x1ffefff22c is on thread 1's stack
==1705645==  in frame #1, created by epoll_modify (ev_epoll.c:72)

Since this is apparently internal to libev, add a suppression.

Fixes flux-framework#3808
@garlick garlick mentioned this issue Aug 1, 2021
Merged
This was referenced Aug 2, 2021
Closed
Closed
chu11 pushed a commit to chu11/flux-core that referenced this issue Sep 28, 2021
@garlick @chu11
testsuite: add valgrind suppression
569e7b2 
Problem: a new valgrind test failure was encountered on aarch64,
Ubuntu 20.04.2 LTS and also the official Jetson Ubuntu 18.04:

==1705645== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==1705645==    at 0x4BDFE38: epoll_ctl (syscall-template.S:78)
==1705645==    by 0x48B37EF: epoll_modify (ev_epoll.c:96)
==1705645==    by 0x48B4F57: fd_reify (ev.c:2166)
==1705645==    by 0x48B4F57: ev_run (ev.c:3677)
==1705645==    by 0x48B4F57: ev_run (ev.c:3623)
==1705645==    by 0x48824FF: flux_reactor_run (reactor.c:126)
==1705645==    by 0x1113BF: main (broker.c:449)
==1705645==  Address 0x1ffefff22c is on thread 1's stack
==1705645==  in frame flux-framework#1, created by epoll_modify (ev_epoll.c:72)

Since this is apparently internal to libev, add a suppression.

Fixes flux-framework#3808
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testsuite: add valgrind suppression for libev on aarch64 garlick/flux-core
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@garlick @javawolfpack