Leeultimatehacker @ a o l . c o m) whatspp +1 ( 7 1 5 ) 3 1 4 - 9 2 4 8
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Thermal Logic: Why Gambling Ended Up at the Heart of the German Resort Economy
Thermal resorts in the 18th and 19th centuries http://auslaendische-online-casinos.de/ needed a way to keep wealthy visitors entertained past dinner. Concerts helped. Theater helped more. But nothing extended the stay — and the spending — quite like a well-appointed room where money could change hands in a socially acceptable setting.
Baden-Baden understood this before most.
The Kurhaus became a model not because it was unique but because it made the interdependence visible. A guest who came for the waters stayed for the tables, spent on the hotel, bought things in the shops, and left having funded an entire local economy for several days. The logic was circular and deliberately so. Civic planners in spa towns across what would become Germany replicated it, which is why the origins of casinos in Germany are not found in any single invention but in a distributed experiment conducted across dozens of small resort towns competing for the same aristocratic clientele throughout the 1800s. Bad Homburg refined the roulette wheel. Wiesbaden attracted the Russian literary crowd. Aachen positioned itself for the Belgian and French market. Each town adapted the model to its geography and its visitors, and the result was a casino culture embedded in regional identity rather than sitting apart from it.
Prussia's 1868 ban interrupted that trajectory sharply.
The decades that followed pushed gambling into legal ambiguity across German territories, and the post-war reconstruction of the industry happened unevenly — shaped more by which states had surviving spa infrastructure than by any coherent national policy. That patchwork is still visible today in the distribution of licensed land-based establishments, clustered around the same historic resort towns that invented the format in the first place.
The digital era forced a reckoning with this geography. Online platforms do not have a location in any meaningful sense, which made the old state-by-state regulatory model collapse under its own inconsistencies. The 2021 Glücksspielstaatsvertrag addressed this by creating a unified federal framework and, critically, establishing the conditions under which providers could obtain a casino Germany EU license — a mechanism bringing domestic law into functional alignment with the internal market principles Brussels had been pressing for years. The treaty imposed strict behavioral constraints: mandatory deposit limits, real-time transaction monitoring, advertising watersheds, and a hard prohibition on certain product categories that had flourished in the unregulated online space. For operators already holding licenses in Malta or Gibraltar, the German market became accessible in theory and expensive in practice. Compliance infrastructure, local tax obligations, and the administrative requirements of the new framework made entry calculations difficult for anyone below a certain scale.
Consolidation followed, as it tends to.
The broader European picture remains deliberately fragmented. France runs its online market through a state-backed monopoly logic. The Netherlands introduced licensing in 2021 under its own Remote Gambling Act, with a different set of consumer protection priorities. Sweden liberalized in 2019 and has spent the years since managing the gap between projected and actual outcomes in problem gambling rates. Germany sits somewhere in this spectrum — more open than its pre-2021 self, more restrictive than the offshore destinations its residents had been using freely for years before the law caught up.
Hi Harry,
On 5/23/26 16:34, Harry Yoo wrote:
>
>
> On 5/23/26 11:00 PM, Yunseong Kim wrote:
>> I've previously experimented with running DEPT alongside syzkaller fuzzing,
>> and many hung tasks missed by lockdep are caught by DEPT, but the resulting
>> high volume of reports makes it easy for issues to get lost in the massive
>> log output. Sorting through that output manually is a huge bottleneck, so
>> leveraging a well-crafted AI prompt to triage the warnings and filter out
>> the false positives would be incredibly valuable.
>
> I mean both 1) detection of deadlock issues AND 2) false positive elimination with AI.
I completely agree. Implanting DEPT's model into an AI review prompt
is a great idea. As you suggested, the patterns we develop for the AI
could provide valuable feedback to enhance DEPT's itself.
> If the review prompt is only used to eliminate DEPT's false positives, I think that would be quite hard to get broad use.
>
> Someone would have to build out-of-tree DEPT, collect the reports, and then feed those back into the AI. I don't think building that kind of pipeline would actually work well in practice.
I also have a huge dept report of DEPT reports, and manually
reviewing all of them is makes me sigh. The constant kernel rebuilds
required for lockup testing every time are also quite expensive.
Thanks for the summary!
Best Regards,
Yunseong
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From: Jiri Pirko <jiri(a)nvidia.com>
Confidential computing (CoCo) VMs/guests, such as AMD SEV and Intel TDX,
run with private/encrypted memory which creates a challenge
for devices that do not support DMA to it (no TDISP support).
For kernel-only DMA operations, swiotlb bounce buffering provides a
transparent solution by copying data through shared memory.
However, the only way to get this memory into userspace is via the DMA
API's dma_alloc_pages()/dma_mmap_pages() type interfaces which limits
the use of the memory to a single DMA device, and is incompatible with
pin_user_pages().
These limitations are particularly problematic for the RDMA subsystem
which makes heavy use of pin_user_pages() and expects flexible memory
usage between many different DMA devices.
This patch series enables userspace to explicitly request shared
(decrypted) memory allocations from new dma-buf system_cc_shared heap.
Userspace can mmap this memory and pass the dma-buf fd to other
existing importers such as RDMA or DRM devices to access the
memory. The DMA API is improved to allow the dma heap exporter to DMA
map the shared memory to each importing device.
Based on dma-mapping-for-next e7442a68cd1ee797b585f045d348781e9c0dde0d
Jiri Pirko (2):
dma-mapping: introduce DMA_ATTR_CC_SHARED for shared memory
dma-buf: heaps: system: add system_cc_shared heap for explicitly
shared memory
drivers/dma-buf/heaps/system_heap.c | 103 ++++++++++++++++++++++++++--
include/linux/dma-mapping.h | 10 +++
include/trace/events/dma.h | 3 +-
kernel/dma/direct.h | 14 +++-
kernel/dma/mapping.c | 13 +++-
5 files changed, 132 insertions(+), 11 deletions(-)
--
2.51.1
Wave Rider surprised me more than I expected. The game looks simple at first, but once the speed increases and the waves become unstable, every run starts feeling intense. Unlike many endless runner games that rely only on fast movement, Wave Rider creates pressure through unpredictable water physics and constantly changing obstacle patterns. Play Wave Rider online at https://wave-rider.io
The gameplay is built around survival. Your board moves forward automatically while you focus on steering through dangerous sections of water. Floating barriers, underwater mines, sharp turns, and narrow lanes appear quickly, forcing players to react within seconds. What I liked most is how the game balances smooth surfing movement with sudden moments of chaos. Sometimes the water feels calm, then everything changes when multiple obstacles appear together.
Wave Rider also rewards risky decisions. Pearls are often hidden near dangerous routes, making players choose between safe movement and higher scores. I found myself taking bigger risks after every run just to see how far I could push the distance counter. The durability system adds even more tension because repeated small crashes slowly reduce your chance of surviving longer sessions.
Game Controls
Left Arrow / A: Move left
Right Arrow / D: Move right
Spacebar or Up Arrow: Jump or glide over obstacles
The controls are easy to learn, but mastering the timing takes practice. Quick reactions help, but smooth movement and patience usually lead to better runs. Players who panic and change direction too aggressively often crash faster than expected.
Overall, Wave Rider feels like a solid arcade experience for anyone who enjoys reaction-based gameplay. The combination of flowing water, rising speed, and nonstop danger makes every session feel fresh and competitive.
When dumping IB contents from a hung job, amdgpu_devcoredump_format()
acquires the VM root PD's reservation lock via amdgpu_vm_lock_by_pasid()
and then, for each IB referenced by the job, calls amdgpu_bo_reserve()
on the BO that backs the IB. Both reservations are taken on
reservation_ww_class_mutex objects but neither uses a ww_acquire_ctx,
which trips lockdep:
WARNING: possible recursive locking detected
--------------------------------------------
kworker/u128:0 is trying to acquire lock:
ffff88838b16e1f0 (reservation_ww_class_mutex){+.+.}-{4:4},
at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu]
but task is already holding lock:
ffff8882f82681f0 (reservation_ww_class_mutex){+.+.}-{4:4},
at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu]
Possible unsafe locking scenario:
CPU0
----
lock(reservation_ww_class_mutex);
lock(reservation_ww_class_mutex);
*** DEADLOCK ***
May be due to missing lock nesting notation
Workqueue: events_unbound amdgpu_devcoredump_deferred_work [amdgpu]
Call Trace:
__ww_mutex_lock.constprop.0
ww_mutex_lock
amdgpu_bo_reserve
amdgpu_devcoredump_format+0x1594 [amdgpu]
amdgpu_devcoredump_deferred_work+0xea [amdgpu]
process_one_work
worker_thread
kthread
The two reservations are on different BOs in the captured trace, so the
splat is a lockdep-correctness warning, not an observed deadlock. It
becomes a real self-deadlock whenever the IB BO shares its dma_resv
with the root PD (the always-valid case, see
amdgpu_vm_is_bo_always_valid()): amdgpu_bo_reserve(abo) re-acquires the
same ww_mutex without a ticket and blocks forever.
With amdgpu.gpu_recovery=0 the timeout handler refires every ~2 s and
each invocation produces this splat, drowning the kernel ring buffer.
Fix it by collecting the per-IB BO references under the root PD's
reservation, then releasing the root before reserving each IB BO
individually. The walk over the VM mapping tree must remain under the
root lock (mappings can be torn down without it), but the actual
content copies do not need to nest inside it. Each per-IB reservation
is now an independent top-level acquire, eliminating the nested
ww_mutex.
The collect/release logic is factored out into two small helpers
(amdgpu_devcoredump_collect_ib_refs / amdgpu_devcoredump_release_ib_refs)
to keep the main function's indentation reasonable.
This also fixes a BO refcount leak in the original code: when
amdgpu_bo_reserve() failed, control jumped to free_ib_content without
running amdgpu_bo_unref(). In the new structure the per-IB BO refs
are released unconditionally in the cleanup helper.
Reproducer (~150 LoC libdrm_amdgpu): submit a single GFX IB containing
PACKET3_INDIRECT_BUFFER chained at GPU VA 0 and wait for the fence.
The TDR fires within ~10 s and the deferred coredump worker produces
the splat above on every invocation.
Fixes: 7b15fc2d1f1a ("drm/amdgpu: dump job ibs in the devcoredump")
Cc: stable(a)vger.kernel.org # 7.1
Signed-off-by: Mikhail Gavrilov <mikhail.v.gavrilov(a)gmail.com>
---
.../gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c | 147 +++++++++++++-----
1 file changed, 110 insertions(+), 37 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
index d386bc775d03..f6bb968de756 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
@@ -207,6 +207,72 @@ static void amdgpu_devcoredump_fw_info(struct amdgpu_device *adev,
}
}
+struct amdgpu_devcoredump_ib_ref {
+ struct amdgpu_bo *bo;
+ u64 offset;
+};
+
+/*
+ * Walk the VM's mapping tree under the root PD's reservation to obtain the BO
+ * that backs each IB and pin it with a refcount. The root PD reservation is
+ * dropped before this function returns; the caller can then reserve each IB
+ * BO individually without nesting ww_mutex acquires on
+ * reservation_ww_class_mutex.
+ *
+ * Returns an array of num_ibs entries (each ib_refs[i].bo may be NULL if its
+ * mapping was not found), or NULL on allocation failure / VM lookup failure.
+ * The caller must release the BO refs and free the array.
+ */
+static struct amdgpu_devcoredump_ib_ref *
+amdgpu_devcoredump_collect_ib_refs(struct amdgpu_device *adev,
+ struct amdgpu_coredump_info *coredump)
+{
+ struct amdgpu_devcoredump_ib_ref *ib_refs;
+ struct amdgpu_bo_va_mapping *mapping;
+ struct amdgpu_bo *root;
+ struct amdgpu_vm *vm;
+ u64 va_start;
+
+ ib_refs = kcalloc(coredump->num_ibs, sizeof(*ib_refs), GFP_KERNEL);
+ if (!ib_refs)
+ return NULL;
+
+ vm = amdgpu_vm_lock_by_pasid(adev, &root, coredump->pasid);
+ if (!vm) {
+ kfree(ib_refs);
+ return NULL;
+ }
+
+ for (int i = 0; i < coredump->num_ibs; i++) {
+ va_start = coredump->ibs[i].gpu_addr & AMDGPU_GMC_HOLE_MASK;
+ mapping = amdgpu_vm_bo_lookup_mapping(vm, va_start / AMDGPU_GPU_PAGE_SIZE);
+ if (!mapping)
+ continue;
+
+ ib_refs[i].bo = amdgpu_bo_ref(mapping->bo_va->base.bo);
+ ib_refs[i].offset = va_start -
+ mapping->start * AMDGPU_GPU_PAGE_SIZE;
+ }
+
+ amdgpu_bo_unreserve(root);
+ amdgpu_bo_unref(&root);
+
+ return ib_refs;
+}
+
+static void
+amdgpu_devcoredump_release_ib_refs(struct amdgpu_devcoredump_ib_ref *ib_refs,
+ int num_ibs)
+{
+ if (!ib_refs)
+ return;
+
+ for (int i = 0; i < num_ibs; i++)
+ if (ib_refs[i].bo)
+ amdgpu_bo_unref(&ib_refs[i].bo);
+ kfree(ib_refs);
+}
+
static ssize_t
amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_info *coredump)
{
@@ -214,13 +280,11 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf
struct drm_printer p;
struct drm_print_iterator iter;
struct amdgpu_vm_fault_info *fault_info;
- struct amdgpu_bo_va_mapping *mapping;
struct amdgpu_ip_block *ip_block;
struct amdgpu_res_cursor cursor;
- struct amdgpu_bo *abo, *root;
- uint64_t va_start, offset;
+ struct amdgpu_bo *abo;
+ uint64_t offset;
struct amdgpu_ring *ring;
- struct amdgpu_vm *vm;
u32 *ib_content;
uint8_t *kptr;
int ver, i, j, r;
@@ -343,43 +407,52 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf
drm_printf(&p, "VRAM is lost due to GPU reset!\n");
if (coredump->num_ibs) {
- /* Don't try to lookup the VM or map the BOs when calculating the
- * size required to store the devcoredump.
+ struct amdgpu_devcoredump_ib_ref *ib_refs = NULL;
+
+ /*
+ * Snapshot per-IB BO references under the root PD's reservation,
+ * then release the root before reserving each IB BO individually
+ * to copy its contents.
+ *
+ * Reserving an IB BO while the root PD is still reserved would
+ * be a nested ww_mutex acquire on reservation_ww_class_mutex
+ * without a ww_acquire_ctx, which trips lockdep's recursive-
+ * locking check and self-deadlocks for IB BOs that share their
+ * dma_resv with the root PD (always-valid BOs).
+ *
+ * Skip lookup/reservation entirely on the sizing pass: it does
+ * not write IB content, and the size estimate doesn't depend on
+ * whether the BOs are reachable.
*/
- if (sizing_pass)
- vm = NULL;
- else
- vm = amdgpu_vm_lock_by_pasid(adev, &root, coredump->pasid);
+ if (!sizing_pass)
+ ib_refs = amdgpu_devcoredump_collect_ib_refs(adev, coredump);
- for (int i = 0; i < coredump->num_ibs && (sizing_pass || vm); i++) {
+ for (int i = 0; i < coredump->num_ibs; i++) {
ib_content = kvmalloc_array(coredump->ibs[i].ib_size_dw, 4,
GFP_KERNEL);
if (!ib_content)
continue;
- /* vm=NULL can only happen when 'sizing_pass' is true. Skip to the
- * drm_printf() calls (ib_content doesn't need to be initialized
- * as its content won't be written anywhere).
- */
- if (!vm)
+ if (sizing_pass)
goto output_ib_content;
- va_start = coredump->ibs[i].gpu_addr & AMDGPU_GMC_HOLE_MASK;
- mapping = amdgpu_vm_bo_lookup_mapping(vm, va_start / AMDGPU_GPU_PAGE_SIZE);
- if (!mapping)
- goto free_ib_content;
+ if (!ib_refs || !ib_refs[i].bo)
+ goto output_ib_content;
+
+ abo = ib_refs[i].bo;
+ offset = ib_refs[i].offset;
- offset = va_start - (mapping->start * AMDGPU_GPU_PAGE_SIZE);
- abo = amdgpu_bo_ref(mapping->bo_va->base.bo);
r = amdgpu_bo_reserve(abo, false);
if (r)
- goto free_ib_content;
+ goto output_ib_content;
if (abo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS) {
off = 0;
- if (abo->tbo.resource->mem_type != TTM_PL_VRAM)
- goto unreserve_abo;
+ if (abo->tbo.resource->mem_type != TTM_PL_VRAM) {
+ amdgpu_bo_unreserve(abo);
+ goto output_ib_content;
+ }
amdgpu_res_first(abo->tbo.resource, offset,
coredump->ibs[i].ib_size_dw * 4,
@@ -395,8 +468,10 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf
r = ttm_bo_kmap(&abo->tbo, 0,
PFN_UP(abo->tbo.base.size),
&abo->kmap);
- if (r)
- goto unreserve_abo;
+ if (r) {
+ amdgpu_bo_unreserve(abo);
+ goto output_ib_content;
+ }
kptr = amdgpu_bo_kptr(abo);
kptr += offset;
@@ -406,21 +481,19 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf
amdgpu_bo_kunmap(abo);
}
+ amdgpu_bo_unreserve(abo);
+
output_ib_content:
drm_printf(&p, "\nIB #%d 0x%llx %d dw\n",
i, coredump->ibs[i].gpu_addr, coredump->ibs[i].ib_size_dw);
- for (int j = 0; j < coredump->ibs[i].ib_size_dw; j++)
- drm_printf(&p, "0x%08x\n", ib_content[j]);
-unreserve_abo:
- if (vm)
- amdgpu_bo_unreserve(abo);
-free_ib_content:
+ if (!sizing_pass && ib_refs && ib_refs[i].bo) {
+ for (int j = 0; j < coredump->ibs[i].ib_size_dw; j++)
+ drm_printf(&p, "0x%08x\n", ib_content[j]);
+ }
kvfree(ib_content);
}
- if (vm) {
- amdgpu_bo_unreserve(root);
- amdgpu_bo_unref(&root);
- }
+
+ amdgpu_devcoredump_release_ib_refs(ib_refs, coredump->num_ibs);
}
return count - iter.remain;
--
2.54.0