diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
index 62533cb148c3..bfe49bc2f322 100644
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -632,7 +632,6 @@ trap(struct trapframe *frame)
 
 user:
 	userret(td, frame);
-	mtx_assert(&Giant, MA_NOTOWNED);
 	KASSERT(PCB_USER_FPU(td->td_pcb),
 	    ("Return from trap with kernel FPU ctx leaked"));
 userout:
diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c
index c0c56787dea0..7536f1148fe6 100644
--- a/sys/i386/i386/trap.c
+++ b/sys/i386/i386/trap.c
@@ -775,7 +775,6 @@ trap(struct trapframe *frame)
 
 user:
 	userret(td, frame);
-	mtx_assert(&Giant, MA_NOTOWNED);
 	KASSERT(PCB_USER_FPU(td->td_pcb),
 	    ("Return from trap with kernel FPU ctx leaked"));
 userout:
diff --git a/sys/ia64/ia32/ia32_trap.c b/sys/ia64/ia32/ia32_trap.c
index 44e06482ae13..cea8f9200915 100644
--- a/sys/ia64/ia32/ia32_trap.c
+++ b/sys/ia64/ia32/ia32_trap.c
@@ -278,6 +278,5 @@ ia32_trap(int vector, struct trapframe *tf)
 
 out:
 	userret(td, tf);
-	mtx_assert(&Giant, MA_NOTOWNED);
 	do_ast(tf);
 }
diff --git a/sys/ia64/ia64/trap.c b/sys/ia64/ia64/trap.c
index d587b05868fd..c0cdaa918838 100644
--- a/sys/ia64/ia64/trap.c
+++ b/sys/ia64/ia64/trap.c
@@ -841,7 +841,6 @@ trap(int vector, struct trapframe *tf)
 out:
 	if (user) {
 		userret(td, tf);
-		mtx_assert(&Giant, MA_NOTOWNED);
 		do_ast(tf);
 	}
 	return;
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 46cdca1ace69..5dc43cac4b31 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -1055,5 +1055,4 @@ fork_return(struct thread *td, struct trapframe *frame)
 	if (KTRPOINT(td, KTR_SYSRET))
 		ktrsysret(SYS_fork, 0, 0);
 #endif
-	mtx_assert(&Giant, MA_NOTOWNED);
 }
diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c
index 095bbdf73b13..dcba5b83fd7c 100644
--- a/sys/kern/subr_trap.c
+++ b/sys/kern/subr_trap.c
@@ -260,7 +260,6 @@ ast(struct trapframe *framep)
 	}
 
 	userret(td, framep);
-	mtx_assert(&Giant, MA_NOTOWNED);
 }
 
 const char *
diff --git a/sys/mips/mips/trap.c b/sys/mips/mips/trap.c
index 7254d4f1524d..5b4e0aa4d5ab 100644
--- a/sys/mips/mips/trap.c
+++ b/sys/mips/mips/trap.c
@@ -1095,7 +1095,6 @@ out:
 	 * Note: we should only get here if returning to user mode.
 	 */
 	userret(td, trapframe);
-	mtx_assert(&Giant, MA_NOTOWNED);
 	return (trapframe->pc);
 }
 
diff --git a/sys/powerpc/aim/trap.c b/sys/powerpc/aim/trap.c
index d419e43f249e..b55d34be5a61 100644
--- a/sys/powerpc/aim/trap.c
+++ b/sys/powerpc/aim/trap.c
@@ -297,7 +297,6 @@ trap(struct trapframe *frame)
 	}
 
 	userret(td, frame);
-	mtx_assert(&Giant, MA_NOTOWNED);
 }
 
 static void
diff --git a/sys/powerpc/booke/trap.c b/sys/powerpc/booke/trap.c
index cd2ab3865bd0..959d8b1d0666 100644
--- a/sys/powerpc/booke/trap.c
+++ b/sys/powerpc/booke/trap.c
@@ -249,7 +249,6 @@ trap(struct trapframe *frame)
 	}
 
 	userret(td, frame);
-	mtx_assert(&Giant, MA_NOTOWNED);
 }
 
 static void
diff --git a/sys/sparc64/sparc64/trap.c b/sys/sparc64/sparc64/trap.c
index 12264b0832e8..b4f0e27fa6d2 100644
--- a/sys/sparc64/sparc64/trap.c
+++ b/sys/sparc64/sparc64/trap.c
@@ -329,7 +329,6 @@ trap(struct trapframe *tf)
 		}
 
 		userret(td, tf);
-		mtx_assert(&Giant, MA_NOTOWNED);
 	} else {
 		KASSERT((tf->tf_type & T_KERNEL) != 0,
 		    ("trap: kernel trap isn't"));