lock in webkit

(gdb) where
#0  0x0000724aee325cec in __lll_lock_wait () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000724aee321354 in _L_lock_997 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x0000724aee3211b7 in pthread_mutex_lock () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x0000724ae2c23710 in sqlite3_close () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#4  0x0000724ae65c6a56 in WebCore::SQLiteDatabase::close (this=0x724adca5b228) at ../Source/WebCore/platform/sql/SQLiteDatabase.cpp:112
#5  0x0000724ae646d72a in WebCore::IconDatabase::setEnabled (this=0x724adca5b000, enabled=false)
    at ../Source/WebCore/loader/icon/IconDatabase.cpp:700
#6  0x0000724ae5f3ba70 in webkitFaviconDatabaseClose (database=<optimized out>)
    at ../Source/WebKit/gtk/webkit/webkitfavicondatabase.cpp:324
#7  webkitFaviconDatabaseClose (database=<error reading variable: Unhandled dwarf expression opcode 0xfa>)
    at ../Source/WebKit/gtk/webkit/webkitfavicondatabase.cpp:321
#8  0x0000724ae5f3c541 in webkit_favicon_database_finalize (object=0x2ecd280) at ../Source/WebKit/gtk/webkit/webkitfavicondatabase.cpp:204
#9  0x0000724aeb44c638 in g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x0000724ae5f3ea7e in webkitExit () at ../Source/WebKit/gtk/webkit/webkitglobals.cpp:282
#11 0x0000724aedfc4df2 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x0000724aedfc4e45 in exit () from /lib/x86_64-linux-gnu/libc.so.6
#13 0x0000000000400f6b in main ()