git: 95e956722a2e - stable/14 - mbuf: add mbuf information to KASSERTs

The branch stable/14 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=95e956722a2ea2d9254456ccf29a42cded71927c

commit 95e956722a2ea2d9254456ccf29a42cded71927c
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2025-04-13 13:25:12 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2025-04-29 10:49:27 +0000

    mbuf: add mbuf information to KASSERTs
    
    Be more consistent about printing the mbuf pointer in KASSERT messages.
    This massively helps debugging and we were already doing a good job at
    it.
    
    Also replace some handrolled KASSERTs with M_ASSERTPKTHDR() for fewer
    copies of the check logic.
    
    In m_align() move the msg into the KASSERT given after it was moved
    here in ed6a66ca6c206 the msg is only used in one place.
    
    Sponsored by:   The FreeBSD Foundation
    Reviewed by:    glebius, zlei
    Differential Revision: https://reviews.freebsd.org/D49817
    
    (cherry picked from commit 22d5d61f91eb70ced6a010d9a1d60f0ff33fff2f)
---
 sys/sys/mbuf.h | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
index 941c907e903b..c17fc9dec9a4 100644
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -1110,7 +1110,7 @@ static inline u_int
 m_extrefcnt(struct mbuf *m)
 {
 
-	KASSERT(m->m_flags & M_EXT, ("%s: M_EXT missing", __func__));
+	KASSERT(m->m_flags & M_EXT, ("%s: M_EXT missing for %p", __func__, m));
 
 	return ((m->m_ext.ext_flags & EXT_FLAG_EMBREF) ? m->m_ext.ext_count :
 	    *m->m_ext.ext_cnt);
@@ -1142,13 +1142,13 @@ m_extrefcnt(struct mbuf *m)
 /* Check if the supplied mbuf has a packet header, or else panic. */
 #define	M_ASSERTPKTHDR(m)						\
 	KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR,			\
-	    ("%s: no mbuf packet header!", __func__))
+	    ("%s: no mbuf %p packet header!", __func__, (m)))
 
 /* Check if the supplied mbuf has no send tag, or else panic. */
 #define	M_ASSERT_NO_SND_TAG(m)						\
 	KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR &&		\
 	       ((m)->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0,		\
-	    ("%s: receive mbuf has send tag!", __func__))
+	    ("%s: receive mbuf %p has send tag!", __func__, (m)))
 
 /* Check if mbuf is multipage. */
 #define M_ASSERTEXTPG(m)						\
@@ -1162,7 +1162,7 @@ m_extrefcnt(struct mbuf *m)
  */
 #define	M_ASSERTVALID(m)						\
 	KASSERT((((struct mbuf *)m)->m_flags & 0) == 0,			\
-	    ("%s: attempted use of a free mbuf!", __func__))
+	    ("%s: attempted use of a free mbuf %p!", __func__, (m)))
 
 /* Check whether any mbuf in the chain is unmapped. */
 #ifdef INVARIANTS
@@ -1207,12 +1207,9 @@ m_extrefcnt(struct mbuf *m)
 static __inline void
 m_align(struct mbuf *m, int len)
 {
-#ifdef INVARIANTS
-	const char *msg = "%s: not a virgin mbuf";
-#endif
 	int adjust;
-
-	KASSERT(m->m_data == M_START(m), (msg, __func__));
+	KASSERT(m->m_data == M_START(m),
+	    ("%s: not a virgin mbuf %p", __func__, m));
 
 	adjust = M_SIZE(m) - len;
 	m->m_data += adjust &~ (sizeof(long)-1);
@@ -1530,14 +1527,16 @@ m_free(struct mbuf *m)
 static __inline int
 rt_m_getfib(struct mbuf *m)
 {
-	KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf."));
+	KASSERT(m->m_flags & M_PKTHDR,
+	    ("%s: Attempt to get FIB from non header mbuf %p", __func__, m));
 	return (m->m_pkthdr.fibnum);
 }
 
 #define M_GETFIB(_m)   rt_m_getfib(_m)
 
 #define M_SETFIB(_m, _fib) do {						\
-        KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf."));	\
+        KASSERT((_m)->m_flags & M_PKTHDR, \
+	    ("%s: Attempt to set FIB on non header mbuf %p", __func__, (_m))); \
 	((_m)->m_pkthdr.fibnum) = (_fib);				\
 } while (0)
 
@@ -1681,9 +1680,9 @@ static inline void
 mbuf_tstmp2timespec(struct mbuf *m, struct timespec *ts)
 {
 
-	KASSERT((m->m_flags & M_PKTHDR) != 0, ("mbuf %p no M_PKTHDR", m));
+	M_ASSERTPKTHDR(m);
 	KASSERT((m->m_flags & (M_TSTMP|M_TSTMP_LRO)) != 0,
-	    ("mbuf %p no M_TSTMP or M_TSTMP_LRO", m));
+	    ("%s: mbuf %p no M_TSTMP or M_TSTMP_LRO", __func__, m));
 	ts->tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000;
 	ts->tv_nsec = m->m_pkthdr.rcv_tstmp % 1000000000;
 }
@@ -1693,9 +1692,9 @@ static inline void
 mbuf_tstmp2timeval(struct mbuf *m, struct timeval *tv)
 {
 
-	KASSERT((m->m_flags & M_PKTHDR) != 0, ("mbuf %p no M_PKTHDR", m));
+	M_ASSERTPKTHDR(m);
 	KASSERT((m->m_flags & (M_TSTMP|M_TSTMP_LRO)) != 0,
-	    ("mbuf %p no M_TSTMP or M_TSTMP_LRO", m));
+	    ("%s: mbuf %p no M_TSTMP or M_TSTMP_LRO", __func__, m));
 	tv->tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000;
 	tv->tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000) / 1000;
 }