On 9/30/2022 4:56 PM, Christian König wrote:
Am 30.09.22 um 10:48 schrieb Arvind Yadav:
BUG: kernel NULL pointer dereference, address: 0000000000000088
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 6.0.0-rc2-custom #1
Arvind : [dma_fence_default_wait _START] timeout = -1
Hardware name: AMD Dibbler/Dibbler, BIOS RDB1107CC 09/26/2018
RIP: 0010:drm_sched_job_done.isra.0+0x11/0x140 [gpu_sched]
Code: 8b fe ff ff be 03 00 00 00 e8 7b da b7 e3 e9 d4 fe ff ff 66
0f 1f 44 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 49 89 fc 53
<48> 8b 9f 88 00 00 00 f0 ff 8b f0 00 00 00 48 8b 83 80 01 00 00 f0
RSP: 0018:ffffb1b1801d4d38 EFLAGS: 00010087
RAX: ffffffffc0aa48b0 RBX: ffffb1b1801d4d70 RCX: 0000000000000018
RDX: 000036c70afb7c1d RSI: ffff8a45ca413c60 RDI: 0000000000000000
RBP: ffffb1b1801d4d50 R08: 00000000000000b5 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffb1b1801d4d70 R14: ffff8a45c4160000 R15: ffff8a45c416a708
FS: 0000000000000000(0000) GS:ffff8a48a0a80000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 000000014ad50000 CR4: 00000000003506e0
Call Trace:
<IRQ>
drm_sched_job_done_cb+0x12/0x20 [gpu_sched]
dma_fence_signal_timestamp_locked+0x7e/0x110
dma_fence_signal+0x31/0x60
amdgpu_fence_process+0xc4/0x140 [amdgpu]
gfx_v9_0_eop_irq+0x9d/0xd0 [amdgpu]
amdgpu_irq_dispatch+0xb7/0x210 [amdgpu]
amdgpu_ih_process+0x86/0x100 [amdgpu]
amdgpu_irq_handler+0x24/0x60 [amdgpu]
__handle_irq_event_percpu+0x4b/0x190
handle_irq_event_percpu+0x15/0x50
handle_irq_event+0x39/0x60
handle_edge_irq+0xaf/0x210
__common_interrupt+0x6e/0x110
common_interrupt+0xc1/0xe0
</IRQ>
<TASK>
How is this triggered any why haven't we seen it before?
IGT has few 'amdgpu' specific testcases which is not related to fence.
while running those test cases I have got this crash but this crash is
not always reproducible.
~Arvind
Christian
Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
---
drivers/gpu/drm/scheduler/sched_main.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/scheduler/sched_main.c
b/drivers/gpu/drm/scheduler/sched_main.c
index 6684d88463b4..390272f6b126 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -172,7 +172,12 @@ drm_sched_rq_select_entity(struct drm_sched_rq *rq)
static void drm_sched_job_done(struct drm_sched_job *s_job)
{
struct drm_sched_fence *s_fence = s_job->s_fence;
- struct drm_gpu_scheduler *sched = s_fence->sched;
+ struct drm_gpu_scheduler *sched;
+
+ if (!s_fence)
+ return;
+
+ sched = s_fence->sched;
atomic_dec(&sched->hw_rq_count);
atomic_dec(sched->score);
