diff options
| -rw-r--r-- | sys/kern/kern_cons.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/kern/kern_cons.c b/sys/kern/kern_cons.c index bbc0e51..75f9c18 100644 --- a/sys/kern/kern_cons.c +++ b/sys/kern/kern_cons.c @@ -601,7 +601,13 @@ static void cn_drvinit(void *unused) { - mtx_init(&cnputs_mtx, "cnputs_mtx", NULL, MTX_SPIN | MTX_NOWITNESS); + /* + * NOTE: Debug prints and/or witness printouts in console + * driver clients can cause the "cnputs_mtx" mutex to + * recurse. Make sure the "MTX_RECURSE" flags is set! + */ + mtx_init(&cnputs_mtx, "cnputs_mtx", NULL, MTX_SPIN | + MTX_NOWITNESS | MTX_RECURSE); use_cnputs_mtx = 1; } |
