Data race in pthread_mutex_destroy (xferquota)

Job #3387972 failed for 15eaf9d3.

The xferquota system test produces TSAN error in system:clang:tsan CI job.

WARNING: ThreadSanitizer: data race 
  Write of size 1 at 0x000000000001 by thread T1:
    #0 pthread_mutex_destroy <null> (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #1 qpmulti_destroy_cb lib/dns/qp.c:1442:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #2 <null> <null> (BuildId: 317457052cc2fe394e6cea9241fff1d4303f7d0a)

  Previous atomic read of size 1 at 0x000000000001 by thread T2 (mutexes: write M1):
    #0 pthread_mutex_unlock <null> (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #1 reclaim_chunks_cb lib/dns/qp.c:668:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #2 <null> <null> (BuildId: 317457052cc2fe394e6cea9241fff1d4303f7d0a)

  Location is heap block of size 168 at 0x000000000007 allocated by main thread:
    #0 malloc <null> (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #1 mallocx lib/isc/./jemalloc_shim.h:65:14 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #2 mem_get lib/isc/mem.c:305:8
    #3 isc__mem_get lib/isc/mem.c:674:8 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #4 dns_qpmulti_create lib/dns/qp.c:1375:25 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #5 dns_zt_create lib/dns/zt.c:104:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #6 dns_view_create lib/dns/view.c:137:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #7 create_view bin/named/server.c:6440:11 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #8 load_configuration bin/named/server.c:9140:12 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #9 run_server bin/named/server.c:9982:2 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #10 isc__async_cb lib/isc/async.c:112:3 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #11 uv__async_io /usr/src/libuv-v1.44.1/src/unix/async.c:163:5 (BuildId: 120c450d14885aa5308bc95c4ea77de2c2b1cc36)
    #12 thread_body lib/isc/thread.c:87:8 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #13 isc_thread_main lib/isc/thread.c:118:2
    #14 isc_loopmgr_run lib/isc/loop.c:452:2 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #15 main bin/named/main.c:1532:2 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)

  Mutex M1 (0x000000000001) created at:
    #0 pthread_mutex_init <null> (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #1 dns_qpmulti_create lib/dns/qp.c:1380:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #2 dns_zt_create lib/dns/zt.c:104:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #3 dns_view_create lib/dns/view.c:137:2 (BuildId: a40b420aa20f73afe0e46a58e58153e948670aef)
    #4 create_view bin/named/server.c:6440:11 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #5 load_configuration bin/named/server.c:9140:12 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #6 run_server bin/named/server.c:9982:2 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #7 isc__async_cb lib/isc/async.c:112:3 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #8 uv__async_io /usr/src/libuv-v1.44.1/src/unix/async.c:163:5 (BuildId: 120c450d14885aa5308bc95c4ea77de2c2b1cc36)
    #9 thread_body lib/isc/thread.c:87:8 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #10 isc_thread_main lib/isc/thread.c:118:2
    #11 isc_loopmgr_run lib/isc/loop.c:452:2 (BuildId: 177803d1e9f1786301abb0f570f88676ff9a5f04)
    #12 main bin/named/main.c:1532:2 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)

  Thread T1 (running) created by main thread at:
    #0 pthread_create <null> (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #1 <null> <null> (BuildId: 317457052cc2fe394e6cea9241fff1d4303f7d0a)
    #2 main bin/named/main.c:1532:2 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)

  Thread T2 (running) created by main thread at:
    #0 pthread_create <null> (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)
    #1 <null> <null> (BuildId: 317457052cc2fe394e6cea9241fff1d4303f7d0a)
    #2 main bin/named/main.c:1532:2 (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098)

SUMMARY: ThreadSanitizer: data race (BuildId: 7e82076ead252161dd1e856775766c8d7ccea098) in pthread_mutex_destroy

In daily CI pipelines, it started on Saturday when the fanf-urcu-qp branch was merged, and happens with 75 % reliability since.