The branch stable/12 has been updated by hselasky:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=8d804809630fd145683de92ba502a9ed34b94115

commit 8d804809630fd145683de92ba502a9ed34b94115
Author:     Hans Petter Selasky <[email protected]>
AuthorDate: 2021-10-05 08:46:56 +0000
Commit:     Hans Petter Selasky <[email protected]>
CommitDate: 2021-10-12 12:17:02 +0000

    mlx4en(4): Fix wrong mbuf cluster size in mlx4_en_debugnet_init()
    
    This fixes an "invalid cluster size" panic when debugnet is activated.
    
    panic()
    m_getzone()
    debugnet_mbuf_reinit()
    debugnet_any_ifnet_update()
    ifhwioctl()
    ifioctl()
    
    Submitted by:   ae@
    PR:             258923
    Sponsored by:   NVIDIA Networking
    
    (cherry picked from commit 5a7de2b42caf6241e87b417a0521e9ab303989d7)
---
 sys/dev/mlx4/mlx4_en/mlx4_en_netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/mlx4/mlx4_en/mlx4_en_netdev.c 
b/sys/dev/mlx4/mlx4_en/mlx4_en_netdev.c
index f128aa3c1bd0..85e323b9a882 100644
--- a/sys/dev/mlx4/mlx4_en/mlx4_en_netdev.c
+++ b/sys/dev/mlx4/mlx4_en/mlx4_en_netdev.c
@@ -2904,7 +2904,7 @@ mlx4_en_netdump_init(struct ifnet *dev, int *nrxr, int 
*ncl, int *clsize)
        mutex_lock(&priv->mdev->state_lock);
        *nrxr = priv->rx_ring_num;
        *ncl = NETDUMP_MAX_IN_FLIGHT;
-       *clsize = priv->rx_mb_size;
+       *clsize = MCLBYTES;
        mutex_unlock(&priv->mdev->state_lock);
 }
 

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