Hi, On 3/16/26 01:57, Dr. David Alan Gilbert wrote: > Hi, > I'm not sure if this is repeatable, but I landed with a null > pointer during a GPU reset, so thought I should probably > report it: > 6.19.7-300.fc44.x86_64 > Mar 16 00:24:39 dalek kernel: BUG: kernel NULL pointer dereference, address: > 0000000000000018 > Mar 16 00:24:39 dalek kernel: #PF: supervisor read access in kernel mode > .... > Mar 16 00:24:39 dalek kernel: Workqueue: amdgpu-reset-dev > drm_sched_job_timedout [gpu_sched] > Mar 16 00:24:39 dalek kernel: RIP: 0010:dma_fence_is_signaled+0x12/0x60 > [amdgpu] > > see full oops below; > > 09:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] > Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] (rev c7) > AMD Ryzen 9 3950X > > I suspect the timeout was real, and caused by a runaway llama, I forgot the > flag to stop it trying to use the GPU for image encoding; but the null page > seems unfortunate. Impressively the audio still kept playing via it: > > I have the devcoredump copied if it's of interest > (Note for self: ~/amd.core-2026-03-16)
Can you open up a bug report for that and please provide what line of code amdgpu_device_gpu_recover.cold+0x244 decodes to. Thanks, Christian. > > Dave > > > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: Dumping IP State > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: Dumping IP State > Completed > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: [drm] AMDGPU > device coredump file has been created > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: [drm] Check your > /sys/class/drm/card1/device/devcoredump/data > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: ring gfx timeout, > signaled seq=1705630, emitted seq=1705633 > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: Process > llama-mtmd-cli pid 299886 thread llama-mtmd-cli pid 299886 > Mar 16 00:24:28 dalek kernel: amdgpu 0000:09:00.0: amdgpu: GPU reset begin!. > Source: 1 > Mar 16 00:24:32 dalek kernel: amdgpu 0000:09:00.0: amdgpu: failed to suspend > display audio > Mar 16 00:24:32 dalek kernel: amdgpu 0000:09:00.0: amdgpu: Guilty job already > signaled, skipping HW reset > Mar 16 00:24:32 dalek kernel: amdgpu 0000:09:00.0: amdgpu: GPU reset(1) > succeeded! > Mar 16 00:24:32 dalek kernel: amdgpu 0000:09:00.0: [drm] device wedged, but > recovered through reset > Mar 16 00:24:34 dalek lightdm[40555]: ATTENTION: default value of option > mesa_glthread overridden by environment. > Mar 16 00:24:34 dalek kernel: amdgpu 0000:09:00.0: amdgpu: Dumping IP State > Mar 16 00:24:34 dalek kernel: amdgpu 0000:09:00.0: amdgpu: Dumping IP State > Completed > Mar 16 00:24:34 dalek kernel: amdgpu 0000:09:00.0: amdgpu: [drm] AMDGPU > device coredump file has been created > Mar 16 00:24:34 dalek kernel: amdgpu 0000:09:00.0: amdgpu: [drm] Check your > /sys/class/drm/card1/device/devcoredump/data > Mar 16 00:24:34 dalek kernel: amdgpu 0000:09:00.0: amdgpu: ring gfx timeout, > signaled seq=1705632, emitted seq=1705637 > Mar 16 00:24:34 dalek kernel: amdgpu 0000:09:00.0: amdgpu: GPU reset begin!. > Source: 1 > Mar 16 00:24:38 dalek kernel: amdgpu 0000:09:00.0: amdgpu: failed to suspend > display audio > Mar 16 00:24:39 dalek kernel: BUG: kernel NULL pointer dereference, address: > 0000000000000018 > Mar 16 00:24:39 dalek kernel: #PF: supervisor read access in kernel mode > Mar 16 00:24:39 dalek kernel: #PF: error_code(0x0000) - not-present page > Mar 16 00:24:39 dalek kernel: PGD 849708067 P4D 849708067 PUD 15d277067 PMD 0 > Mar 16 00:24:39 dalek kernel: Oops: Oops: 0000 [#1] SMP NOPTI > Mar 16 00:24:39 dalek kernel: CPU: 7 UID: 0 PID: 298062 Comm: kworker/u128:2 > Not tainted 6.19.7-300.fc44.x86_64 #1 PREEMPT(lazy) > Mar 16 00:24:39 dalek kernel: Hardware name: To Be Filled By O.E.M. To Be > Filled By O.E.M./X570 Pro4, BIOS P3.10 07/13/2020 > Mar 16 00:24:39 dalek kernel: Workqueue: amdgpu-reset-dev > drm_sched_job_timedout [gpu_sched] > Mar 16 00:24:39 dalek kernel: RIP: 0010:dma_fence_is_signaled+0x12/0x60 > [amdgpu] > Mar 16 00:24:39 dalek kernel: Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 > 90 90 90 90 90 90 90 90 90 90 48 8b 47 30 48 d1 e8 89 c2 83 e2 01 75 2c 48 8b> > Mar 16 00:24:39 dalek kernel: RSP: 0018:ffffcf349c553d20 EFLAGS: 00010246 > Mar 16 00:24:39 dalek kernel: RAX: 0000000000000000 RBX: ffffcf349c553da0 > RCX: 0000000000000000 > Mar 16 00:24:39 dalek kernel: RDX: 0000000000000000 RSI: 0000000000000000 > RDI: ffff8bce4ecd4380 > Mar 16 00:24:39 dalek kernel: RBP: 0000000000000000 R08: 0000000010000020 > R09: ffff8bc9c0400b68 > Mar 16 00:24:39 dalek kernel: R10: 0000000000000080 R11: ffffffffa16760a0 > R12: ffff8bc9e9100000 > Mar 16 00:24:39 dalek kernel: R13: ffff8bca7ccab200 R14: 0000000000000000 > R15: 0000000000000000 > Mar 16 00:24:39 dalek kernel: FS: 0000000000000000(0000) > GS:ffff8bd90c066000(0000) knlGS:0000000000000000 > Mar 16 00:24:39 dalek kernel: CS: 0010 DS: 0000 ES: 0000 CR0: > 0000000080050033 > Mar 16 00:24:39 dalek kernel: CR2: 0000000000000018 CR3: 00000001c591f000 > CR4: 0000000000350ef0 > Mar 16 00:24:39 dalek kernel: Call Trace: > Mar 16 00:24:39 dalek kernel: <TASK> > Mar 16 00:24:39 dalek kernel: amdgpu_device_gpu_recover.cold+0x244/0x2ec > [amdgpu] > Mar 16 00:24:39 dalek kernel: amdgpu_job_timedout.cold+0x218/0x258 [amdgpu] > Mar 16 00:24:39 dalek kernel: ? srso_return_thunk+0x5/0x5f > Mar 16 00:24:39 dalek kernel: drm_sched_job_timedout+0x8b/0x190 [gpu_sched] > Mar 16 00:24:39 dalek kernel: ? srso_return_thunk+0x5/0x5f > Mar 16 00:24:39 dalek kernel: process_one_work+0x190/0x350 > Mar 16 00:24:39 dalek kernel: worker_thread+0x18d/0x2f0 > Mar 16 00:24:39 dalek kernel: ? __pfx_worker_thread+0x10/0x10 > Mar 16 00:24:39 dalek kernel: kthread+0xfa/0x240 > Mar 16 00:24:39 dalek kernel: ? finish_task_switch.isra.0+0x82/0x2a0 > Mar 16 00:24:39 dalek kernel: ? __pfx_kthread+0x10/0x10 > Mar 16 00:24:39 dalek kernel: ? __pfx_kthread+0x10/0x10 > Mar 16 00:24:39 dalek kernel: ret_from_fork+0x130/0x1a0 > Mar 16 00:24:39 dalek kernel: ? __pfx_kthread+0x10/0x10 > Mar 16 00:24:39 dalek kernel: ret_from_fork_asm+0x1a/0x30 > Mar 16 00:24:39 dalek kernel: </TASK> > Mar 16 00:24:39 dalek kernel: Modules linked in: dm_crypt snd_seq_dummy > snd_hrtimer nft_masq nft_reject_ipv4 act_csum cls_u32 sch_htb nf_nat_tftp > nf_conntr> > Mar 16 00:24:39 dalek kernel: drm_panel_backlight_quirks gpu_sched > drm_suballoc_helper video drm_buddy drm_display_helper nvme nvme_core cec > ghash_clmulni> > Mar 16 00:24:39 dalek kernel: CR2: 0000000000000018 > Mar 16 00:24:39 dalek kernel: ---[ end trace 0000000000000000 ]--- > Mar 16 00:24:39 dalek kernel: RIP: 0010:dma_fence_is_signaled+0x12/0x60 > [amdgpu] > Mar 16 00:24:39 dalek kernel: Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 > 90 90 90 90 90 90 90 90 90 90 48 8b 47 30 48 d1 e8 89 c2 83 e2 01 75 2c 48 8b> > Mar 16 00:24:39 dalek kernel: RSP: 0018:ffffcf349c553d20 EFLAGS: 00010246 > Mar 16 00:24:39 dalek kernel: RAX: 0000000000000000 RBX: ffffcf349c553da0 > RCX: 0000000000000000 > Mar 16 00:24:39 dalek kernel: RDX: 0000000000000000 RSI: 0000000000000000 > RDI: ffff8bce4ecd4380 > Mar 16 00:24:39 dalek kernel: RBP: 0000000000000000 R08: 0000000010000020 > R09: ffff8bc9c0400b68 > Mar 16 00:24:39 dalek kernel: R10: 0000000000000080 R11: ffffffffa16760a0 > R12: ffff8bc9e9100000 > Mar 16 00:24:39 dalek kernel: R13: ffff8bca7ccab200 R14: 0000000000000000 > R15: 0000000000000000 > Mar 16 00:24:39 dalek kernel: FS: 0000000000000000(0000) > GS:ffff8bd90c066000(0000) knlGS:0000000000000000 > Mar 16 00:24:39 dalek kernel: CS: 0010 DS: 0000 ES: 0000 CR0: > 0000000080050033 > Mar 16 00:24:39 dalek kernel: CR2: 0000000000000018 CR3: 00000001c591f000 > CR4: 0000000000350ef0 > Mar 16 00:24:39 dalek kernel: note: kworker/u128:2[298062] exited with irqs > disabled > > -- > -----Open up your eyes, open up your mind, open up your code ------- > / Dr. David Alan Gilbert | Running GNU/Linux | Happy \ > \ dave @ treblig.org | | In Hex / > \ _________________________|_____ http://www.treblig.org |_______/
