witness: report a thread that can't sleep in WITNESS_WARN

Although this is not related to locking, but seems to be the right
place to catch violators, given that WITNESS_WARN is already used
widely in the kernel.

Reviewed by:		kib, markj
Differential Revision:	https://reviews.freebsd.org/D55316

This commit is contained in:

Gleb Smirnoff

2026-03-05 10:43:17 -08:00

parent 0616521adc

commit 6feb16b77e

1 changed files with 9 additions and 0 deletions

									
										sys/kern/subr_witness.c
									
		+9
		
												View File
												
				@@ -2136,6 +2136,15 @@ witness_warn(int flags, struct lock_object *lock, const char *fmt, ...)

						n += witness_list_locks(&lock_list, printf);

					} else

						sched_unpin();

					if (td->td_no_sleeping != 0 && (flags & WARN_SLEEPOK) != 0) {

						va_start(ap, fmt);

						vprintf(fmt, ap);

						va_end(ap);

						printf(" with %d sleep inhibitors\n", td->td_no_sleeping);

						n += td->td_no_sleeping;

					}

					if (flags & WARN_PANIC && n)

						kassert_panic("%s", __func__);

					else