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Correct order of ossl_condvar_signal in quic_multistream_test - #22616

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Correct order of ossl_condvar_signal in quic_multistream_test#22616
nhorman wants to merge 7 commits into
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nhorman:22588

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@nhorman nhorman commented Nov 3, 2023 •
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quic_multistream test was issuing a signal on a condvar after dropping the corresponding mutex, not before, leading to potential race conditions in the reading of the associated data

Related to #22588

@nhorman
Correct order of ossl_condvar_signal in quic_multistream_test
ecad973 
quic_multistream test was issuing a signal on a condvar after dropping
the corresponding mutex, not before, leading to potential race
conditions in the reading of the associated data

Fixes openssl#22588
@nhorman
nhorman marked this pull request as draft November 3, 2023 16:22
@nhorman nhorman mentioned this pull request Nov 3, 2023
Closed
@hlandau hlandau added approval: review pending This pull request needs review by a committer branch: 3.2 Applies to openssl-3.2 (EOL) branch: master Applies to master branch labels Nov 3, 2023
@hlandau hlandau added this to the 3.2.0 milestone Nov 3, 2023
@nhorman
add locking around fake_now
a3c1041 
fake_now in the quictestlib is read/written by potentially many threads,
and as such should have a surrounding lock to prevent WAR/RAW errors as
caught by tsan:

2023-11-03T16:27:23.7184999Z ==================
2023-11-03T16:27:23.7185290Z WARNING: ThreadSanitizer: data race (pid=18754)
2023-11-03T16:27:23.7185720Z   Read of size 8 at 0x558f6f9fe970 by main thread:
2023-11-03T16:27:23.7186726Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7187665Z     #1 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7188567Z     #2 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7189561Z     #3 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190294Z     #4 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190720Z
2023-11-03T16:27:23.7190902Z   Previous write of size 8 at 0x558f6f9fe970 by thread T1:
2023-11-03T16:27:23.7191607Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aecf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7192505Z     #1 run_server_thread quictestlib.c (quicapitest+0x14b1d6) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193361Z     #2 thread_run quictestlib.c (quicapitest+0x14cadf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193848Z
2023-11-03T16:27:23.7194220Z   Location is global 'fake_now.0' of size 8 at 0x558f6f9fe970 (quicapitest+0x1af4970)
2023-11-03T16:27:23.7194636Z
2023-11-03T16:27:23.7194816Z   Thread T1 (tid=18760, running) created by main thread at:
2023-11-03T16:27:23.7195465Z     #0 pthread_create <null> (quicapitest+0xca12d) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7196317Z     #1 qtest_create_quic_connection_ex <null> (quicapitest+0x14adcb) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7197214Z     #2 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198111Z     #3 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198940Z     #4 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7199661Z     #5 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7200083Z
2023-11-03T16:27:23.7200862Z SUMMARY: ThreadSanitizer: data race (/home/runner/work/openssl/openssl/test/quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5) in qtest_create_quic_connection_ex
@nhorman
fixup! add locking around fake_now
c6398a9
@mattcaswell

mattcaswell commented Nov 3, 2023

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LGTM...pending this coming out of draft before approval.

@nhorman

nhorman commented Nov 4, 2023

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I think this is probably worth merging, even though it doesn't fix the nonstop problem yet, as locking shared data (fake_now), and correcting the mutex/signal order is the right thing to do in terms of programming patterns

@nhorman
nhorman marked this pull request as ready for review November 4, 2023 14:17
hlandau
hlandau suggested changes Nov 6, 2023
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Comment thread test/helpers/quictestlib.c Outdated
Comment thread test/helpers/quictestlib.c
Comment thread test/helpers/quictestlib.c Outdated
@hlandau

hlandau commented Nov 6, 2023

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Few comments, otherwise looks good

@nhorman nhorman mentioned this pull request Nov 6, 2023
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paulidale
paulidale reviewed Nov 7, 2023
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Comment thread test/helpers/quictestlib.c Outdated
@t8m t8m added triaged: bug The issue/pr is/fixes a bug tests: present The PR has suitable tests present labels Nov 7, 2023
@mattcaswell mattcaswell added approval: done This pull request has the required number of approvals and removed approval: review pending This pull request needs review by a committer labels Nov 7, 2023
@levitte

levitte commented Nov 7, 2023

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This might fix the issues I've noticed on VMS. I'll have a look this evening

t8m
t8m requested changes Nov 8, 2023
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Comment thread test/helpers/quictestlib.c
Comment on lines +363 to +364
/* zero time can have a special meaning, bump it */
qtest_add_time(1);

@t8m t8m Nov 8, 2023

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Is this racy? Could you just ossl_time_add() inside the write lock?

Alternatively you can see this function as something that should be never used in racy contexts and drop the lock calls completely here. Using this in a racy context would mean that we need to have multiple fake_now storages per use actually because otherwise one thread could reset the fake time for another innocent thread and the time would go backwards.

@nhorman nhorman Nov 8, 2023

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I don't think this is racy. qtest_add_time retakes the global lock, so there aren't any read/write races strictly speaking. It is theoretically possible that another thread might read the zero time, but given that this is during setup, there should be no other threads running

Comment thread test/helpers/quictestlib.c Outdated
Comment thread test/helpers/quictestlib.c Outdated
@openssl-machine

openssl-machine commented Nov 8, 2023

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24 hours has passed since 'approval: done' was set, but as this PR has been updated in that time the label 'approval: ready to merge' is not being automatically set. Please review the updates and set the label manually.

@t8m

t8m commented Nov 8, 2023

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As the last fixup is only a trivial code style fix no re-approvals are IMO needed.

@t8m t8m added approval: ready to merge The 24 hour grace period has passed, ready to merge and removed approval: done This pull request has the required number of approvals labels Nov 8, 2023
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t8m commented Nov 8, 2023

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Merged to the master and 3.2 branches. Thank you.

@t8m t8m closed this Nov 8, 2023
openssl-machine pushed a commit that referenced this pull request Nov 8, 2023
@nhorman @t8m
Correct order of ossl_condvar_signal in quic_multistream_test
b4cf49c 
quic_multistream test was issuing a signal on a condvar after dropping
the corresponding mutex, not before, leading to potential race
conditions in the reading of the associated data

Fixes #22588

Reviewed-by: Hugo Landau <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
(Merged from #22616)

(cherry picked from commit 22b482a)
openssl-machine pushed a commit that referenced this pull request Nov 8, 2023
@nhorman @t8m
add locking around fake_now
d025b22 
fake_now in the quictestlib is read/written by potentially many threads,
and as such should have a surrounding lock to prevent WAR/RAW errors as
caught by tsan:

2023-11-03T16:27:23.7184999Z ==================
2023-11-03T16:27:23.7185290Z WARNING: ThreadSanitizer: data race (pid=18754)
2023-11-03T16:27:23.7185720Z   Read of size 8 at 0x558f6f9fe970 by main thread:
2023-11-03T16:27:23.7186726Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7187665Z     #1 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7188567Z     #2 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7189561Z     #3 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190294Z     #4 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190720Z
2023-11-03T16:27:23.7190902Z   Previous write of size 8 at 0x558f6f9fe970 by thread T1:
2023-11-03T16:27:23.7191607Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aecf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7192505Z     #1 run_server_thread quictestlib.c (quicapitest+0x14b1d6) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193361Z     #2 thread_run quictestlib.c (quicapitest+0x14cadf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193848Z
2023-11-03T16:27:23.7194220Z   Location is global 'fake_now.0' of size 8 at 0x558f6f9fe970 (quicapitest+0x1af4970)
2023-11-03T16:27:23.7194636Z
2023-11-03T16:27:23.7194816Z   Thread T1 (tid=18760, running) created by main thread at:
2023-11-03T16:27:23.7195465Z     #0 pthread_create <null> (quicapitest+0xca12d) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7196317Z     #1 qtest_create_quic_connection_ex <null> (quicapitest+0x14adcb) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7197214Z     #2 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198111Z     #3 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198940Z     #4 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7199661Z     #5 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7200083Z
2023-11-03T16:27:23.7200862Z SUMMARY: ThreadSanitizer: data race (/home/runner/work/openssl/openssl/test/quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5) in qtest_create_quic_connection_ex

Reviewed-by: Hugo Landau <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
(Merged from #22616)

(cherry picked from commit 11179b3)
openssl-machine pushed a commit that referenced this pull request Nov 8, 2023
@nhorman @t8m
Correct order of ossl_condvar_signal in quic_multistream_test
22b482a 
quic_multistream test was issuing a signal on a condvar after dropping
the corresponding mutex, not before, leading to potential race
conditions in the reading of the associated data

Fixes #22588

Reviewed-by: Hugo Landau <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
(Merged from #22616)
openssl-machine pushed a commit that referenced this pull request Nov 8, 2023
@nhorman @t8m
add locking around fake_now
11179b3 
fake_now in the quictestlib is read/written by potentially many threads,
and as such should have a surrounding lock to prevent WAR/RAW errors as
caught by tsan:

2023-11-03T16:27:23.7184999Z ==================
2023-11-03T16:27:23.7185290Z WARNING: ThreadSanitizer: data race (pid=18754)
2023-11-03T16:27:23.7185720Z   Read of size 8 at 0x558f6f9fe970 by main thread:
2023-11-03T16:27:23.7186726Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7187665Z     #1 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7188567Z     #2 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7189561Z     #3 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190294Z     #4 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190720Z
2023-11-03T16:27:23.7190902Z   Previous write of size 8 at 0x558f6f9fe970 by thread T1:
2023-11-03T16:27:23.7191607Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aecf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7192505Z     #1 run_server_thread quictestlib.c (quicapitest+0x14b1d6) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193361Z     #2 thread_run quictestlib.c (quicapitest+0x14cadf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193848Z
2023-11-03T16:27:23.7194220Z   Location is global 'fake_now.0' of size 8 at 0x558f6f9fe970 (quicapitest+0x1af4970)
2023-11-03T16:27:23.7194636Z
2023-11-03T16:27:23.7194816Z   Thread T1 (tid=18760, running) created by main thread at:
2023-11-03T16:27:23.7195465Z     #0 pthread_create <null> (quicapitest+0xca12d) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7196317Z     #1 qtest_create_quic_connection_ex <null> (quicapitest+0x14adcb) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7197214Z     #2 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198111Z     #3 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198940Z     #4 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7199661Z     #5 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7200083Z
2023-11-03T16:27:23.7200862Z SUMMARY: ThreadSanitizer: data race (/home/runner/work/openssl/openssl/test/quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5) in qtest_create_quic_connection_ex

Reviewed-by: Hugo Landau <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
(Merged from #22616)
@levitte

levitte commented Nov 8, 2023

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Unfortunately, this didn't fix the VMS test issue either... [sigh]

wanghao75 pushed a commit to openeuler-mirror/openssl that referenced this pull request Nov 14, 2023
@nhorman fly2x
Correct order of ossl_condvar_signal in quic_multistream_test
aef23dc 
quic_multistream test was issuing a signal on a condvar after dropping
the corresponding mutex, not before, leading to potential race
conditions in the reading of the associated data

Fixes #22588

Reviewed-by: Hugo Landau <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
(Merged from openssl/openssl#22616)

Signed-off-by: fly2x <[email protected]>
wanghao75 pushed a commit to openeuler-mirror/openssl that referenced this pull request Nov 14, 2023
@nhorman fly2x
add locking around fake_now
cf54d7d 
fake_now in the quictestlib is read/written by potentially many threads,
and as such should have a surrounding lock to prevent WAR/RAW errors as
caught by tsan:

2023-11-03T16:27:23.7184999Z ==================
2023-11-03T16:27:23.7185290Z WARNING: ThreadSanitizer: data race (pid=18754)
2023-11-03T16:27:23.7185720Z   Read of size 8 at 0x558f6f9fe970 by main thread:
2023-11-03T16:27:23.7186726Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7187665Z     #1 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7188567Z     #2 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7189561Z     #3 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190294Z     #4 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7190720Z
2023-11-03T16:27:23.7190902Z   Previous write of size 8 at 0x558f6f9fe970 by thread T1:
2023-11-03T16:27:23.7191607Z     #0 qtest_create_quic_connection_ex <null> (quicapitest+0x14aecf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7192505Z     #1 run_server_thread quictestlib.c (quicapitest+0x14b1d6) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193361Z     #2 thread_run quictestlib.c (quicapitest+0x14cadf) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7193848Z
2023-11-03T16:27:23.7194220Z   Location is global 'fake_now.0' of size 8 at 0x558f6f9fe970 (quicapitest+0x1af4970)
2023-11-03T16:27:23.7194636Z
2023-11-03T16:27:23.7194816Z   Thread T1 (tid=18760, running) created by main thread at:
2023-11-03T16:27:23.7195465Z     #0 pthread_create <null> (quicapitest+0xca12d) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7196317Z     #1 qtest_create_quic_connection_ex <null> (quicapitest+0x14adcb) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7197214Z     #2 qtest_create_quic_connection <null> (quicapitest+0x14b220) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198111Z     #3 test_quic_write_read quicapitest.c (quicapitest+0x150ee2) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7198940Z     #4 run_tests <null> (quicapitest+0x2237ab) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7199661Z     #5 main <null> (quicapitest+0x223d2b) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5)
2023-11-03T16:27:23.7200083Z
2023-11-03T16:27:23.7200862Z SUMMARY: ThreadSanitizer: data race (/home/runner/work/openssl/openssl/test/quicapitest+0x14aead) (BuildId: d06f7b04830b55de9c8482b398a1781472d1c7d5) in qtest_create_quic_connection_ex

Reviewed-by: Hugo Landau <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
(Merged from openssl/openssl#22616)

Signed-off-by: fly2x <[email protected]>
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@t-j-h t-j-h t-j-h left review comments
@t8m t8m t8m approved these changes
@mattcaswell mattcaswell mattcaswell approved these changes
@paulidale paulidale paulidale approved these changes
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@hlandau hlandau hlandau approved these changes
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approval: ready to merge The 24 hour grace period has passed, ready to merge branch: master Applies to master branch branch: 3.2 Applies to openssl-3.2 (EOL) tests: present The PR has suitable tests present triaged: bug The issue/pr is/fixes a bug

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@nhorman @mattcaswell @hlandau @levitte @openssl-machine @t8m @t-j-h @paulidale