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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1739576215397019100 This is nasty. https://gitlab.com/xen-project/people/andyhhp/xen/-/jobs/9137008215 When preprocessed, we get: diff --git a/xen/common/sched/credit2.c b/xen/common/sched/credit2.c index 0a83f237259f..6b8d3660240a 100644 --- a/xen/common/sched/credit2.c +++ b/xen/common/sched/credit2.c @@ -958,7 +958,28 @@ cpu_add_to_runqueue(const struct scheduler *ops, unsigned int cpu) =C2=A0=C2=A0=C2=A0=C2=A0 write_lock_irqsave(&prv->lock, flags); =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 rqd_ins =3D &prv->rql; + +#if 0 =C2=A0=C2=A0=C2=A0=C2=A0 list_for_each_entry ( rqd, &prv->rql, rql ) +#else +=C2=A0=C2=A0=C2=A0 for ( (rqd) =3D ({ +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 typeof(((typeof(*(rqd)) *)((void*)0))->rql) *__mptr =3D +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ((&prv->rql)->next); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 (typeof(*(rqd)) *) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ((char *)__mptr - +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 __builtin_offsetof(typeof(= *(rqd)),rql) ); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &(rqd)->rql !=3D //= <-- problem expression +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 (&prv->rql); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (rqd) =3D ({ +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 typeof(((typeof(*(rqd)) *)((void*)0))->rql) = *__mptr =3D +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ((rqd)->rql.next); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (typeof(*(rqd)) *) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ((char *)__mptr - +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 __builtin_offs= etof(typeof(*(rqd)),rql) ); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 }) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ) +#endif =C2=A0=C2=A0=C2=A0=C2=A0 { =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Remember first unused q= ueue index. */ =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if ( !rqi_unused && rqd->i= d > rqi ) The alignment of csched2_runqueue_data is 8, while csched2_private is 4. priv's list_head for rql is at +28 (+0x1c), and list_for_each_entry() performs a buggily-typed container_of(), treating a csched2_private as if it were csched2_runqueue_data. It functions because it's only an address equality check, but it's also why UBSAN objects. This seems to fix the issue: diff --git a/xen/common/sched/credit2.c b/xen/common/sched/credit2.c index 6b8d3660240a..ab938942d75f 100644 --- a/xen/common/sched/credit2.c +++ b/xen/common/sched/credit2.c @@ -537,7 +537,8 @@ struct csched2_private { =C2=A0=C2=A0=C2=A0=C2=A0 unsigned int ratelimit_us;=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 /* Rate limiting for this scheduler=C2=A0=C2=A0 */ =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 unsigned int active_queues;=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 /* Number of active runqueues=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ -=C2=A0=C2=A0=C2=A0 struct list_head rql;=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* List of runqueues=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ +=C2=A0=C2=A0=C2=A0 struct list_head rql=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* List of runqueues=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ +=C2=A0=C2=A0=C2=A0 __aligned(alignof(struct csched2_runqueue_data)); =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 cpumask_t initialized;=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* CPUs part of this scheduler=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ =C2=A0=C2=A0=C2=A0=C2=A0 struct list_head sdom;=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* List of domains (for debug key)=C2=A0=C2=A0=C2=A0 */ but it's obviously not a viable fix.=C2=A0 I can't help feeling that the bug is really in the list macros. ~Andrew