2022-12-14T04:43:42 [1233099] | [rr 1234348 53153]221214 4:41:52 [rr 1234348 53156][ERROR] mysqld got signal 6 ;
(rr) bt
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=109951340336704) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=109951340336704) at ./nptl/pthread_kill.c:78
#2 GI_pthread_kill (threadid=109951340336704, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x0000151d40946476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x0000151d4092c7f3 in __GI_abort () at ./stdlib/abort.c:79
#5 0x00005621f92b04da in ib::fatal::~fatal (this=this@entry=0x64000a951390, __in_chrg=<optimized out>) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/ut/ut0ut.cc:527
#6 0x00005621f8f812c6 in os_file_sync_posix (file=file@entry=54) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/os/os0file.cc:876
#7 0x00005621f8f85ab4 in os_file_flush_func (file=54) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/os/os0file.cc:940
#8 0x00005621f94ce80f in fil_space_t::flush_low (this=this@entry=0x61200006cf40) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/fil/fil0fil.cc:514
#9 0x00005621f91cd39d in fil_space_t::flush<false> (this=0x61200006cf40) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/include/fil0fil.h:1521
#10 0x00005621f91cbf08 in row_quiesce_table_start (table=0x618000046108, trx=trx@entry=0x4a873573b540) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/row/row0quiesce.cc:531
#11 0x00005621f8d992af in ha_innobase::external_lock (this=0x61d00025c6b8, thd=<optimized out>, lock_type=<optimized out>) at /data/Server/bb-10.11-new-innodb-defaults/storage/innobase/handler/ha_innodb.cc:15876
#12 0x00005621f837ca0a in handler::ha_external_lock (this=0x61d00025c6b8, thd=thd@entry=0x62b00020d218, lock_type=lock_type@entry=0) at /data/Server/bb-10.11-new-innodb-defaults/sql/handler.cc:7094
#13 0x00005621f88ce719 in lock_external (thd=thd@entry=0x62b00020d218, tables=0x606000196078, count=1) at /data/Server/bb-10.11-new-innodb-defaults/sql/lock.cc:396
#14 0x00005621f88cf628 in mysql_lock_tables (thd=thd@entry=0x62b00020d218, sql_lock=sql_lock@entry=0x606000196058, flags=flags@entry=4096) at /data/Server/bb-10.11-new-innodb-defaults/sql/lock.cc:341
#15 0x00005621f88d10bc in mysql_lock_tables (thd=thd@entry=0x62b00020d218, tables=tables@entry=0x629000e88ab0, count=count@entry=1, flags=flags@entry=4096) at /data/Server/bb-10.11-new-innodb-defaults/sql/lock.cc:304
#16 0x00005621f7883dbe in lock_tables (thd=thd@entry=0x62b00020d218, tables=0x629000e88380, count=<optimized out>, flags=flags@entry=4096) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_base.cc:5818
#17 0x00005621f7886d48 in open_and_lock_tables (thd=thd@entry=0x62b00020d218, options=..., tables=tables@entry=0x629000e88380, derived=derived@entry=false, flags=flags@entry=4096, prelocking_strategy=prelocking_strategy@entry=0x64000a9527c0)
at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_base.cc:5578
#18 0x00005621f7f4159e in open_and_lock_tables (prelocking_strategy=0x64000a9527c0, flags=4096, derived=false, tables=0x629000e88380, thd=0x62b00020d218) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_base.h:279
#19 flush_tables_with_read_lock (thd=thd@entry=0x62b00020d218, all_tables=0x629000e88380) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_reload.cc:588
#20 0x00005621f7a361e7 in mysql_execute_command (thd=thd@entry=0x62b00020d218, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_parse.cc:5416
#21 0x00005621f7a3befa in mysql_parse (thd=thd@entry=0x62b00020d218, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x64000a953610) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_parse.cc:8000
#22 0x00005621f7a42736 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x62b00020d218, packet=packet@entry=0x629000e7e219 "FLUSH TABLE C FOR EXPORT /* E_R Thread6 QNO 8 CON_ID 22 */ ", packet_length=packet_length@entry=61,
blocking=blocking@entry=true) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_parse.cc:1894
#23 0x00005621f7a47795 in do_command (thd=0x62b00020d218, blocking=blocking@entry=true) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_parse.cc:1407
#24 0x00005621f7eafd3e in do_handle_one_connection (connect=<optimized out>, connect@entry=0x608000003238, put_in_cache=put_in_cache@entry=true) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_connect.cc:1415
#25 0x00005621f7eb03a4 in handle_one_connection (arg=0x608000003238) at /data/Server/bb-10.11-new-innodb-defaults/sql/sql_connect.cc:1317
#26 0x0000151d40998b43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#27 0x0000151d40a29bb4 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:100
GIT_SHOW: HEAD -> master, origin/master, origin/HEAD 572309e7c8e1561daea5903bb707591cef89e1ee 2022-12-13T19:50:23+01:00
Thank you, mleich. I believe that this bug was introduced by MDEV-23855. A race condition with unlink() or DROP TABLE was fixed in MDEV-24391, but this one is a race condition between close() and fdatasync(). Can you please check if the following patch would fix this?
+ else if (!(acquire_low() & (STOPPING | CLOSING)))
{
flush_low();
release();
Your test case depends on MDEV-30136, which will cause all data files to be closed and reopened on the SET GLOBAL statement. I think that the race condition is possible, albeit almost impossible to reproduce, in earlier versions as well. Files could also be closed due to innodb_open_files (see MDEV-25215 for some discussion).
Marko Mäkelä
added a comment - Thank you, mleich . I believe that this bug was introduced by MDEV-23855 . A race condition with unlink() or DROP TABLE was fixed in MDEV-24391 , but this one is a race condition between close() and fdatasync() . Can you please check if the following patch would fix this?
diff --git a/storage/innobase/include/fil0fil.h b/storage/innobase/include/fil0fil.h
index f44aae05bb3..00486d3a7d8 100644
--- a/storage/innobase/include/fil0fil.h
+++ b/storage/innobase/include/fil0fil.h
@@ -1516,7 +1516,7 @@ template<bool have_reference> inline void fil_space_t::flush()
ut_ad(purpose == FIL_TYPE_TABLESPACE || purpose == FIL_TYPE_IMPORT);
if (have_reference)
flush_low();
- else if (!(acquire_low() & STOPPING))
+ else if (!(acquire_low() & (STOPPING | CLOSING)))
{
flush_low();
release();
Your test case depends on MDEV-30136 , which will cause all data files to be closed and reopened on the SET GLOBAL statement. I think that the race condition is possible, albeit almost impossible to reproduce, in earlier versions as well. Files could also be closed due to innodb_open_files (see MDEV-25215 for some discussion).
The motivation of the fix is that any thread that has expressed its intention to close the file will be responsible for invoking os_file_flush_func() on it. Hence, if that flag is set, the current thread can rely on the other thread to take care of the flushing. In the rr replay trace that I analyzed, the other thread that had closed the file immediately before the crash occurred had also invoked fdatasync() on it.
Marko Mäkelä
added a comment - The motivation of the fix is that any thread that has expressed its intention to close the file will be responsible for invoking os_file_flush_func() on it. Hence, if that flag is set, the current thread can rely on the other thread to take care of the flushing. In the rr replay trace that I analyzed, the other thread that had closed the file immediately before the crash occurred had also invoked fdatasync() on it.
Sorry, it looks like the patch would leak a reference. We need to release() if either flag was set. I guess that in the STOPPING case (deleting the tablespace), nothing was checking for the reference count to be 0 afterwards.
Marko Mäkelä
added a comment - Sorry, it looks like the patch would leak a reference. We need to release() if either flag was set. I guess that in the STOPPING case (deleting the tablespace), nothing was checking for the reference count to be 0 afterwards.
diff --git a/storage/innobase/include/fil0fil.h b/storage/innobase/include/fil0fil.h
index f44aae05bb3..b26b16965fc 100644
--- a/storage/innobase/include/fil0fil.h
+++ b/storage/innobase/include/fil0fil.h
@@ -1516,9 +1516,10 @@ template<bool have_reference> inline void fil_space_t::flush()
ut_ad(purpose == FIL_TYPE_TABLESPACE || purpose == FIL_TYPE_IMPORT);
if (have_reference)
flush_low();
- else if (!(acquire_low() & STOPPING))
+ else
{
- flush_low();
+ if (!(acquire_low() & (STOPPING | CLOSING)))
+ flush_low();
release();
}
}
origin/bb-10.11-new-innodb-defaults 5505ded98c35499d3cd130e8a3373389d76069e9 2022-12-14T15:42:50+02:00
with the patch from above applied.
Result of ~1800 runs of the simplified RQG tests:
No replay of the bad effect and also no other bad effect.
Without the patch I get a replay with less than 100 test runs.
Matthias Leich
added a comment - origin/bb-10.11-new-innodb-defaults 5505ded98c35499d3cd130e8a3373389d76069e9 2022-12-14T15:42:50+02:00
with the patch from above applied.
Result of ~1800 runs of the simplified RQG tests:
No replay of the bad effect and also no other bad effect.
Without the patch I get a replay with less than 100 test runs.
People
Marko Mäkelä
Matthias Leich
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Bug
Major
Thank you, mleich. I believe that this bug was introduced by
MDEV-23855. A race condition with unlink() or DROP TABLE was fixed inMDEV-24391, but this one is a race condition between close() and fdatasync(). Can you please check if the following patch would fix this?diff --git a/storage/innobase/include/fil0fil.h b/storage/innobase/include/fil0fil.hindex f44aae05bb3..00486d3a7d8 100644--- a/storage/innobase/include/fil0fil.h+++ b/storage/innobase/include/fil0fil.h@@ -1516,7 +1516,7 @@ template<bool have_reference> inline void fil_space_t::flush()ut_ad(purpose == FIL_TYPE_TABLESPACE || purpose == FIL_TYPE_IMPORT);if (have_reference)flush_low();- else if (!(acquire_low() & STOPPING))+ else if (!(acquire_low() & (STOPPING | CLOSING))){flush_low();Your test case depends on
MDEV-30136, which will cause all data files to be closed and reopened on the SET GLOBAL statement. I think that the race condition is possible, albeit almost impossible to reproduce, in earlier versions as well. Files could also be closed due to innodb_open_files (seeMDEV-25215for some discussion).