$ ./scripts/remote-gdb 10.0.1.100:9999 ./build_dir/target-x86_64_glibc-2.27/urbackup-server-2.4.13/urbackupsrv
Using target x86_64 (glibc, -2.27)
GNU gdb (GDB) 11.1
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Reading symbols from ./build_dir/target-x86_64_glibc-2.27/urbackup-server-2.4.13/urbackupsrv...
0x00007ffff7fd8090 in _start ()
from /root/Entware/scripts/../staging_dir/target-x86_64_glibc-2.27/root-x64-3.2/opt/lib/ld-linux-x86-64.so.2
(gdb) set remote exec-file /opt/bin/urbackupsrv
(gdb) set args run -u admin -v debug
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /root/Entware/build_dir/target-x86_64_glibc-2.27/urbackup-server-2.4.13/urbackupsrv run -u admin -v debug
[New Thread 9407.9409]
[New Thread 9407.9410]
Thread 1 "urbackupsrv" received signal SIGSEGV, Segmentation fault.
0x000000000055dece in sqlite3WalFindFrame (pWal=0xbdb948, pgno=1, piRead=piRead@entry=0x7fffffffb394) at sqlite/sqlite3.c:60697
60697 for(iKey=walHash(pgno); sLoc.aHash[iKey]; iKey=walNextHash(iKey)){
(gdb) bt
#0 0x000000000055dece in sqlite3WalFindFrame (pWal=0xbdb948, pgno=1, piRead=piRead@entry=0x7fffffffb394)
at sqlite/sqlite3.c:60697
#1 0x000000000055e002 in readDbPage (pPg=pPg@entry=0xbf0f88) at sqlite/sqlite3.c:53112
#2 0x000000000056608f in getPageNormal (pPager=0xbbc758, pgno=1, ppPage=0x7fffffffb400, flags=<optimized out>)
at sqlite/sqlite3.c:55607
#3 0x0000000000525fdd in sqlite3PagerGet (flags=0, ppPage=0x7fffffffb400, pgno=1, pPager=<optimized out>)
at sqlite/sqlite3.c:55722
#4 btreeGetPage (pBt=pBt@entry=0xbba518, pgno=pgno@entry=1, ppPage=ppPage@entry=0x7fffffffb460, flags=flags@entry=0)
at sqlite/sqlite3.c:64699
#5 0x0000000000567291 in lockBtree (pBt=0xbba518) at sqlite/sqlite3.c:65657
#6 sqlite3BtreeBeginTrans (p=0xbba448, wrflag=wrflag@entry=0, pSchemaVersion=pSchemaVersion@entry=0x0)
at sqlite/sqlite3.c:493
#7 0x0000000000595211 in sqlite3InitOne (db=0xbbbe08, iDb=iDb@entry=0, pzErrMsg=pzErrMsg@entry=0x7fffffffc248,
mFlags=mFlags@entry=0) at sqlite/sqlite3.c:122405
#8 0x00000000005953cc in sqlite3Init (db=db@entry=0xbbbe08, pzErrMsg=pzErrMsg@entry=0x7fffffffc248)
at sqlite/sqlite3.c:122590
#9 0x000000000059540f in sqlite3ReadSchema (pParse=pParse@entry=0x7fffffffc240) at sqlite/sqlite3.c:122616
#10 0x00000000005a1a50 in sqlite3Pragma (pParse=pParse@entry=0x7fffffffc240, pId1=pId1@entry=0x7fffffffb888,
pId2=pId2@entry=0x7fffffffb8a0, pValue=pValue@entry=0x7fffffffb8d0, minusFlag=minusFlag@entry=0)
at sqlite/sqlite3.c:120139
#11 0x00000000005a4567 in yy_reduce (yyLookahead=<optimized out>, pParse=0x7fffffffc240, yyruleno=232,
yypParser=0x7fffffffb840, yyLookaheadToken=...) at sqlite/sqlite3.c:149648
#12 sqlite3Parser (yyminor=..., yymajor=<optimized out>, yyp=0x7fffffffb840) at sqlite/sqlite3.c:19102
#13 sqlite3RunParser (pParse=0x7fffffffc240, zSql=0xbdb371 "", pzErrMsg=0x7fffffffc238) at sqlite/sqlite3.c:20225
#14 0x00000000005a97d4 in sqlite3Prepare (db=db@entry=0xbbbe08, zSql=zSql@entry=0xbbc308 "PRAGMA synchronous=NORMAL",
nBytes=nBytes@entry=25, prepFlags=prepFlags@entry=128, pReprepare=pReprepare@entry=0x0,
ppStmt=ppStmt@entry=0x7fffffffc4e8, pzTail=0x7fffffffc4f0) at sqlite/sqlite3.c:122806
#15 0x00000000005a9c0f in sqlite3LockAndPrepare (db=0xbbbe08, zSql=0xbbc308 "PRAGMA synchronous=NORMAL", nBytes=25,
prepFlags=prepFlags@entry=128, pOld=pOld@entry=0x0, ppStmt=ppStmt@entry=0x7fffffffc4e8, pzTail=0x7fffffffc4f0)
at sqlite/sqlite3.c:122906
--Type <RET> for more, q to quit, c to continue without paging--
#16 0x00000000005a9f46 in sqlite3_prepare_v2 (db=<optimized out>, zSql=<optimized out>, nBytes=<optimized out>,
ppStmt=ppStmt@entry=0x7fffffffc4e8, pzTail=pzTail@entry=0x7fffffffc4f0) at sqlite/sqlite3.c:122989
#17 0x00000000004c8c76 in CDatabase::Prepare (this=this@entry=0xbbbc90, pQuery=..., autodestroy=autodestroy@entry=false)
at Database.cpp:341
#18 0x00000000004c6d78 in CDatabase::Write (this=0xbbbc90, pQuery=...) at Database.cpp:232
#19 0x00000000004ca84b in CDatabase::Open (this=this@entry=0xbbbc90, pFile=..., attach=...,
allocation_chunk_size=allocation_chunk_size@entry=52428800, p_single_user_mutex=p_single_user_mutex@entry=0xbbb990,
p_lock_mutex=p_lock_mutex@entry=0xbb7da0, p_lock_count=0xbbb860, p_unlock_cond=0xbb8e70, p_params=...)
at /root/Entware/staging_dir/toolchain-x86_64_gcc-8.4.0_glibc-2.27/x86_64-openwrt-linux-gnu/include/c++/8.4.0/ext/new_allocator.h:79
#20 0x00000000004d715f in CServer::getDatabase (this=this@entry=0xb76dc0, tid=<optimized out>,
pIdentifier=pIdentifier@entry=23) at Server.cpp:917
#21 0x00000000006270b6 in open_server_database (init_db=<optimized out>) at urbackupserver/dllmain.cpp:239
#22 0x0000000000631ae0 in LoadActions_urbackupserver (pServer=<optimized out>) at urbackupserver/dllmain.cpp:644
#23 0x00000000004daaae in CServer::LoadStaticPlugins (this=this@entry=0xb76dc0) at Server.cpp:2246
#24 0x00000000004f0748 in main_fkt (argc=<optimized out>, argv=<optimized out>) at main.cpp:554
#25 0x00000000004f2d7d in main_fkt_catch (argc=<optimized out>, argv=<optimized out>) at main.cpp:130
#26 0x000000000082db01 in run_real_main (args=...) at urbackupserver/cmdline_preprocessor.cpp:98
#27 0x00000000008396e7 in action_run (args=...) at urbackupserver/cmdline_preprocessor.cpp:531
#28 0x00000000004bfd3d in main (argc=<optimized out>, argv=0x7fffffffe898) at urbackupserver/cmdline_preprocessor.cpp:1270
(gdb)
A lot more context in the original Entware issue.
) As soon as a client is added, independant of it’s OS or the amount of files to backup, the segfault rears it’s ugly head.