https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107498
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution|--- |INVALID --- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > Program received signal SIGBUS, Bus error. > 0x00000100000ceda4 in mdb_node_add (mc=0x100004327b8, indx=<optimized out>, > key=0x7feffffe0a0, data=0x7feffffe090, pgno=0, flags=0) at > ./../../../libraries/liblmdb/mdb.c:7366 > 7366 mp->mp_lower += sizeof(indx_t); > (gdb) p mp > $1 = (MDB_page *) 0x10000463caa Thanks. So that's definitely *not* a compiler bug but a programming error as per the 6.5.3.2(4) clause of the ISO C standard: "The unary * operator denotes indirection. If the operand points to a function, the result is a function designator; if it points to an object, the result is an lvalue designating the object. If the operand has type "pointer to type", the result has type "type". If an invalid value has been assigned to the pointer, the behavior of the unary * operator is undefined.(106)" (106) Among the invalid values for dereferencing a pointer by the unary * operator are a null pointer, an address inappropriately aligned for the type of object pointed to, and the address of an object after the end of its lifetime.