Date: Mon, 11 Nov 2019 13:22:09 +0100 From: Hans Petter Selasky <hps@selasky.org> To: sgk@troutmask.apl.washington.edu, Mark Johnston <markj@freebsd.org> Cc: freebsd-current@freebsd.org, freebsd-x11@freebsd.org Subject: Re: unkillable process consuming 100% cpu Message-ID: <64e980fa-aa9b-e656-92a1-110d9cbf9059@selasky.org> In-Reply-To: <3e11232b-e2a6-9169-adb0-da0e94523b39@selasky.org> References: <20191107202919.GA4565@troutmask.apl.washington.edu> <20191107203223.GF16978@raichu> <20191108220935.GA856@troutmask.apl.washington.edu> <6a4e5993-623a-ebaa-8180-e11c7d48e706@selasky.org> <dc2aa04a-6f7b-e369-57c8-b9555df4dd15@selasky.org> <3e11232b-e2a6-9169-adb0-da0e94523b39@selasky.org>
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On 2019-11-11 11:44, Hans Petter Selasky wrote:
> Seems like we can optimise away one more write memory barrier.
>
> If you are building from ports, simply:
>
> cd work/kms-drm*
> cat seqlock.diff | patch -p1
>
Hi,
Here is one more debug patch you can try. See if you get that print
added in the patch in dmesg.
--HPS
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diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index a6e0a16ae..0697d70f4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -31,6 +31,8 @@
#include "amdgpu_vm.h"
#include "amdgpu_amdkfd.h"
+#include <sys/kdb.h>
+
/* Special VM and GART address alignment needed for VI pre-Fiji due to
* a HW bug.
*/
@@ -236,6 +238,12 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
*ef_count = 0;
}
+ if (resv != NULL &&
+ (struct thread *)SX_OWNER(resv->lock.base.sx.sx_lock) != curthread) {
+ printf("Called unlocked\n");
+ kdb_backtrace();
+ }
+
old = reservation_object_get_list(resv);
if (!old)
return 0;
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