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Use CMM_{STORE,LOAD}_SHARED to store/load glue in gluelist

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ThreadSanitizer has trouble understanding that gluelist->glue is
constant after it is assigned to the slabheader with cmpxchg.  Help
ThreadSanitizer to understand the code by using CMM_STORE_SHARED and
CMM_LOAD_SHARED on gluelist->glue.

The ThreadSanitizer report:

    WARNING: ThreadSanitizer: data race
      Read of size 8 at 0x000000000001 by thread T0001:
	#0 addglue lib/dns/qpzone.c:5304 (BuildId: 62aa74b0423f77cc56d705f02c2412b4762577cb)
	#1 dns_db_addglue lib/dns/db.c:1119 (BuildId: 62aa74b0423f77cc56d705f02c2412b4762577cb)
	#2 query_additional lib/ns/query.c:2230 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#3 query_addrrset lib/ns/query.c:2324
	#4 query_prepare_delegation_response lib/ns/query.c:8595 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#5 query_delegation lib/ns/query.c:8780 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#6 query_notfound lib/ns/query.c:8552 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#7 query_gotanswer lib/ns/query.c:7553 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#8 query_lookup lib/ns/query.c:6020 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#9 ns__query_start lib/ns/query.c:5690 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#10 query_setup lib/ns/query.c:5239 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#11 ns_query_start lib/ns/query.c:11979 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#12 ns_client_request_continue lib/ns/client.c:2466 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#13 ns_client_request lib/ns/client.c:2142 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#14 isc___nm_readcb netmgr/netmgr.c:1859 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#15 isc__nm_readcb netmgr/netmgr.c:1874
	#16 isc__nm_udp_read_cb netmgr/udp.c:589 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#17 uv__udp_recvmmsg src/unix/udp.c:202 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#18 uv__udp_recvmsg src/unix/udp.c:245 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#19 uv__udp_io src/unix/udp.c:142
	#20 uv__io_poll src/unix/linux.c:1564 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#21 uv_run src/unix/core.c:458 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#22 loop_thread lib/isc/loop.c:328 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#23 thread_body lib/isc/thread.c:85 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#24 thread_run lib/isc/thread.c:100

      Previous write of size 8 at 0x000000000001 by thread T0002:
	#0 create_gluelist lib/dns/qpzone.c:5253 (BuildId: 62aa74b0423f77cc56d705f02c2412b4762577cb)
	#1 addglue lib/dns/qpzone.c:5281
	#2 dns_db_addglue lib/dns/db.c:1119 (BuildId: 62aa74b0423f77cc56d705f02c2412b4762577cb)
	#3 query_additional lib/ns/query.c:2230 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#4 query_addrrset lib/ns/query.c:2324
	#5 query_prepare_delegation_response lib/ns/query.c:8595 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#6 query_delegation lib/ns/query.c:8780 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#7 query_notfound lib/ns/query.c:8552 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#8 query_gotanswer lib/ns/query.c:7553 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#9 query_lookup lib/ns/query.c:6020 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#10 ns__query_start lib/ns/query.c:5690 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#11 query_setup lib/ns/query.c:5239 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#12 ns_query_start lib/ns/query.c:11979 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#13 ns_client_request_continue lib/ns/client.c:2466 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#14 ns_client_request lib/ns/client.c:2142 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#15 isc___nm_readcb netmgr/netmgr.c:1859 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#16 isc__nm_readcb netmgr/netmgr.c:1874
	#17 isc__nm_udp_read_cb netmgr/udp.c:589 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#18 uv__udp_recvmmsg src/unix/udp.c:202 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#19 uv__udp_recvmsg src/unix/udp.c:245 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#20 uv__udp_io src/unix/udp.c:142
	#21 uv__io_poll src/unix/linux.c:1564 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#22 uv_run src/unix/core.c:458 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#23 loop_thread lib/isc/loop.c:328 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#24 thread_body lib/isc/thread.c:85 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#25 thread_run lib/isc/thread.c:100

      Location is heap block of size 88 at 0x000000000024 allocated by thread T0002:
	#0 malloc <null> (BuildId: c08afb1c60772d9b4e4d4be38d0c0434c5b41990)
	#1 mallocx lib/isc/jemalloc_shim.h:41 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#2 mem_get lib/isc/mem.c:303
	#3 isc__mem_get lib/isc/mem.c:654
	#4 new_gluelist lib/dns/qpzone.c:5012 (BuildId: 62aa74b0423f77cc56d705f02c2412b4762577cb)
	#5 create_gluelist lib/dns/qpzone.c:5241
	#6 addglue lib/dns/qpzone.c:5281
	#7 dns_db_addglue lib/dns/db.c:1119 (BuildId: 62aa74b0423f77cc56d705f02c2412b4762577cb)
	#8 query_additional lib/ns/query.c:2230 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#9 query_addrrset lib/ns/query.c:2324
	#10 query_prepare_delegation_response lib/ns/query.c:8595 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#11 query_delegation lib/ns/query.c:8780 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#12 query_notfound lib/ns/query.c:8552 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#13 query_gotanswer lib/ns/query.c:7553 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#14 query_lookup lib/ns/query.c:6020 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#15 ns__query_start lib/ns/query.c:5690 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#16 query_setup lib/ns/query.c:5239 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#17 ns_query_start lib/ns/query.c:11979 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#18 ns_client_request_continue lib/ns/client.c:2466 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#19 ns_client_request lib/ns/client.c:2142 (BuildId: 9cc0711aeddfa6164f4f6fd94b0187f7bfa13ff2)
	#20 isc___nm_readcb netmgr/netmgr.c:1859 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#21 isc__nm_readcb netmgr/netmgr.c:1874
	#22 isc__nm_udp_read_cb netmgr/udp.c:589 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#23 uv__udp_recvmmsg src/unix/udp.c:202 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#24 uv__udp_recvmsg src/unix/udp.c:245 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#25 uv__udp_io src/unix/udp.c:142
	#26 uv__io_poll src/unix/linux.c:1564 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#27 uv_run src/unix/core.c:458 (BuildId: 355edf0d38120d6761c51ee8cab2c162dff57b0a)
	#28 loop_thread lib/isc/loop.c:328 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#29 thread_body lib/isc/thread.c:85 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#30 thread_run lib/isc/thread.c:100

      Thread T0001 'isc-loop-0002' (running) created by main thread at:
	#0 pthread_create <null> (BuildId: c08afb1c60772d9b4e4d4be38d0c0434c5b41990)
	#1 isc_thread_create lib/isc/thread.c:139 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#2 isc_loopmgr_run lib/isc/loop.c:508 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#3 main bin/named/main.c:1532 (BuildId: d03d7837520674921fd1fe7c353cb790cab69b3b)

      Thread T0002 'isc-loop-0003' (running) created by main thread at:
	#0 pthread_create <null> (BuildId: c08afb1c60772d9b4e4d4be38d0c0434c5b41990)
	#1 isc_thread_create lib/isc/thread.c:139 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#2 isc_loopmgr_run lib/isc/loop.c:508 (BuildId: de1ebc9b2642ead6bbd0f4553c7144c016b01ffc)
	#3 main bin/named/main.c:1532 (BuildId: d03d7837520674921fd1fe7c353cb790cab69b3b)

    SUMMARY: ThreadSanitizer: data race lib/dns/qpzone.c:5304 in addglue
This commit is contained in:
Ondřej Surý 2024-12-25 15:14:10 +01:00
parent 1fea227ab8
commit f7316b44b9
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/dns/qpzone.c
View File

@ -5250,7 +5250,7 @@ create_gluelist(qpzonedb_t *qpdb, qpz_version_t *version, qpznode_t *node,
(void)dns_rdataset_additionaldata(rdataset, dns_rootname,
glue_nsdname_cb, &ctx);
gluelist->glue = ctx.glue;
CMM_STORE_SHARED(gluelist->glue, ctx.glue);
return gluelist;
}
@ -5301,7 +5301,7 @@ addglue(dns_db_t *db, dns_dbversion_t *dbversion, dns_rdataset_t *rdataset,
}
}
glue = gluelist->glue;
glue = CMM_LOAD_SHARED(gluelist->glue);
if (glue != NULL) {
addglue_to_message(glue, msg);