[{"id":3675079,"web_url":"http://patchwork.ozlabs.org/comment/3675079/","msgid":"<19616f14-a876-4ae3-9dfb-082060806f17@canonical.com>","list_archive_url":null,"date":"2026-04-09T05:18:20","subject":"ACK: [SRU][Q][PATCH 0/2] BUG: kernel NULL pointer dereference in\n amdgpu(regression)","submitter":{"id":85372,"url":"http://patchwork.ozlabs.org/api/people/85372/","name":"Masahiro Yamada","email":"masahiro.yamada@canonical.com"},"content":"On 4/7/26 16:53, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2144577\n>\n> [Impact]\n> System freezes during boot on machines with AMD Southern Islands (SI) GPUs\n> using the amdgpu driver\n> .\n> The amdgpu driver calls flush_gpu_tlb_pasid() in a workqueue, but on SI\n> hardware this function pointer is NULL. The kernel hits a NULL pointer\n> dereference in amdgpu_gmc_flush_gpu_tlb_pasid() and crashes.\n>\n> Error log:\n> kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000\n> kernel: Workqueue: events amdgpu_tlb_fence_work [amdgpu]\n> kernel: RIP: 0010:0x0\n> kernel: Call Trace:\n> kernel: amdgpu_gmc_flush_gpu_tlb_pasid+0xfd/0x480 [amdgpu]\n> kernel: amdgpu_tlb_fence_work+0x77/0x110 [amdgpu]\n>\n> Hits every boot on affected hardware. Regression from 6.17.0-14 to 6.17.0-19.\n>\n> [Fix]\n> Two patches fix this together:\n> 1. f4db9913e4d3 (\"drm/amdgpu: validate the flush_gpu_tlb_pasid()\")\n> Adds a NULL check for flush_gpu_tlb_pasid before calling it.\n> Upstream in v7.0-rc1.\n> 2. e3a6eff92bbd (\"drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\")\n> Fixes the first patch — the early return skipped the unlock, causing\n> a deadlock. Changes the bare return to a goto that unlocks first.\n> Upstream in v7.0-rc1.\n> Fixes: f4db9913e4d3\n>\n> [Test Plan]\n> On a machine with an AMD SI GPU (Tahiti, Pitcairn, Verde, Oland, Hainan)\n> booted with amdgpu.si_support=1:\n>\n> $ sudo reboot\n>\n> Without patches: kernel NULL pointer dereference during boot, system freezes.\n> With patches: system boots normally, no crash or error in dmesg.\n>\n> Check dmesg after boot:\n> $ dmesg | grep -i \"BUG\\|NULL pointer\\|amdgpu\"\n>\n> Without patches: \"BUG: kernel NULL pointer dereference\" present.\n> With patches: no BUG or NULL pointer lines.\n>\n> [Where problems could occur]\n> Could break TLB flushing on amdgpu.\n>\n> If the NULL check gates too broadly, TLB flushes could be skipped on GPUs\n> that do have flush_gpu_tlb_pasid. This would cause stale TLB entries and\n> GPU page faults or rendering corruption.\n>\n> The unlock path change in the second patch touches the reset/lock logic in\n> amdgpu_gmc_flush_gpu_tlb_pasid(). A wrong goto target could leave the\n> reset domain lock held, deadlocking the GPU.\n>\n> [Other Info]\n> Both patches are upstream in v7.0-rc1.\n>\n> Prike Liang (1):\n> drm/amdgpu: validate the flush_gpu_tlb_pasid()\n>\n> Timur Kristóf (1):\n> drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\n>\n> drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 6 ++++++\n> 1 file changed, 6 insertions(+)\n>\n\nAcked-by: Masahiro Yamada ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=CtbSUbS4;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4frpB06rfnz1xtJ\n\tfor ; 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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3675645,"web_url":"http://patchwork.ozlabs.org/comment/3675645/","msgid":"<2ccf9832-7079-4a10-af4b-e7b2ef1fc4d6@canonical.com>","list_archive_url":null,"date":"2026-04-10T04:10:13","subject":"ACK: [SRU][Q][PATCH 0/2] BUG: kernel NULL pointer dereference in\n amdgpu(regression)","submitter":{"id":92836,"url":"http://patchwork.ozlabs.org/api/people/92836/","name":"Yufeng Gao","email":"yufeng.gao@canonical.com"},"content":"On 7/4/26 17:53, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2144577\n>\n> [Impact]\n> System freezes during boot on machines with AMD Southern Islands (SI) GPUs\n> using the amdgpu driver\n> .\n> The amdgpu driver calls flush_gpu_tlb_pasid() in a workqueue, but on SI\n> hardware this function pointer is NULL. The kernel hits a NULL pointer\n> dereference in amdgpu_gmc_flush_gpu_tlb_pasid() and crashes.\n>\n> Error log:\n> kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000\n> kernel: Workqueue: events amdgpu_tlb_fence_work [amdgpu]\n> kernel: RIP: 0010:0x0\n> kernel: Call Trace:\n> kernel: amdgpu_gmc_flush_gpu_tlb_pasid+0xfd/0x480 [amdgpu]\n> kernel: amdgpu_tlb_fence_work+0x77/0x110 [amdgpu]\n>\n> Hits every boot on affected hardware. Regression from 6.17.0-14 to 6.17.0-19.\n>\n> [Fix]\n> Two patches fix this together:\n> 1. f4db9913e4d3 (\"drm/amdgpu: validate the flush_gpu_tlb_pasid()\")\n> Adds a NULL check for flush_gpu_tlb_pasid before calling it.\n> Upstream in v7.0-rc1.\n> 2. e3a6eff92bbd (\"drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\")\n> Fixes the first patch — the early return skipped the unlock, causing\n> a deadlock. Changes the bare return to a goto that unlocks first.\n> Upstream in v7.0-rc1.\n> Fixes: f4db9913e4d3\n>\n> [Test Plan]\n> On a machine with an AMD SI GPU (Tahiti, Pitcairn, Verde, Oland, Hainan)\n> booted with amdgpu.si_support=1:\n>\n> $ sudo reboot\n>\n> Without patches: kernel NULL pointer dereference during boot, system freezes.\n> With patches: system boots normally, no crash or error in dmesg.\n>\n> Check dmesg after boot:\n> $ dmesg | grep -i \"BUG\\|NULL pointer\\|amdgpu\"\n>\n> Without patches: \"BUG: kernel NULL pointer dereference\" present.\n> With patches: no BUG or NULL pointer lines.\n>\n> [Where problems could occur]\n> Could break TLB flushing on amdgpu.\n>\n> If the NULL check gates too broadly, TLB flushes could be skipped on GPUs\n> that do have flush_gpu_tlb_pasid. This would cause stale TLB entries and\n> GPU page faults or rendering corruption.\n>\n> The unlock path change in the second patch touches the reset/lock logic in\n> amdgpu_gmc_flush_gpu_tlb_pasid(). A wrong goto target could leave the\n> reset domain lock held, deadlocking the GPU.\n>\n> [Other Info]\n> Both patches are upstream in v7.0-rc1.\n>\n> Prike Liang (1):\n> drm/amdgpu: validate the flush_gpu_tlb_pasid()\n>\n> Timur Kristóf (1):\n> drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\n>\n> drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 6 ++++++\n> 1 file changed, 6 insertions(+)\n>\nAcked-by: Yufeng Gao ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=MN5lWrAN;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fsNd74cqsz1y2d\n\tfor ; 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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3675813,"web_url":"http://patchwork.ozlabs.org/comment/3675813/","msgid":"<87jyufysui.fsf@gmail.com>","list_archive_url":null,"date":"2026-04-10T11:09:41","subject":"ACK: [SRU][Q][PATCH 0/2] BUG: kernel NULL pointer dereference in\n amdgpu(regression)","submitter":{"id":89305,"url":"http://patchwork.ozlabs.org/api/people/89305/","name":"Mehmet Basaran","email":"mehmet.basaran@canonical.com"},"content":"Acked-by: Mehmet Basaran \nAceLan Kao writes:\n\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2144577\n>\n> [Impact]\n> System freezes during boot on machines with AMD Southern Islands (SI) GPUs\n> using the amdgpu driver\n> .\n> The amdgpu driver calls flush_gpu_tlb_pasid() in a workqueue, but on SI\n> hardware this function pointer is NULL. The kernel hits a NULL pointer\n> dereference in amdgpu_gmc_flush_gpu_tlb_pasid() and crashes.\n>\n> Error log:\n> kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000\n> kernel: Workqueue: events amdgpu_tlb_fence_work [amdgpu]\n> kernel: RIP: 0010:0x0\n> kernel: Call Trace:\n> kernel: amdgpu_gmc_flush_gpu_tlb_pasid+0xfd/0x480 [amdgpu]\n> kernel: amdgpu_tlb_fence_work+0x77/0x110 [amdgpu]\n>\n> Hits every boot on affected hardware. Regression from 6.17.0-14 to 6.17.0-19.\n>\n> [Fix]\n> Two patches fix this together:\n> 1. f4db9913e4d3 (\"drm/amdgpu: validate the flush_gpu_tlb_pasid()\")\n> Adds a NULL check for flush_gpu_tlb_pasid before calling it.\n> Upstream in v7.0-rc1.\n> 2. e3a6eff92bbd (\"drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\")\n> Fixes the first patch — the early return skipped the unlock, causing\n> a deadlock. Changes the bare return to a goto that unlocks first.\n> Upstream in v7.0-rc1.\n> Fixes: f4db9913e4d3\n>\n> [Test Plan]\n> On a machine with an AMD SI GPU (Tahiti, Pitcairn, Verde, Oland, Hainan)\n> booted with amdgpu.si_support=1:\n>\n> $ sudo reboot\n>\n> Without patches: kernel NULL pointer dereference during boot, system freezes.\n> With patches: system boots normally, no crash or error in dmesg.\n>\n> Check dmesg after boot:\n> $ dmesg | grep -i \"BUG\\|NULL pointer\\|amdgpu\"\n>\n> Without patches: \"BUG: kernel NULL pointer dereference\" present.\n> With patches: no BUG or NULL pointer lines.\n>\n> [Where problems could occur]\n> Could break TLB flushing on amdgpu.\n>\n> If the NULL check gates too broadly, TLB flushes could be skipped on GPUs\n> that do have flush_gpu_tlb_pasid. This would cause stale TLB entries and\n> GPU page faults or rendering corruption.\n>\n> The unlock path change in the second patch touches the reset/lock logic in\n> amdgpu_gmc_flush_gpu_tlb_pasid(). A wrong goto target could leave the\n> reset domain lock held, deadlocking the GPU.\n>\n> [Other Info]\n> Both patches are upstream in v7.0-rc1.\n>\n> Prike Liang (1):\n> drm/amdgpu: validate the flush_gpu_tlb_pasid()\n>\n> Timur Kristóf (1):\n> drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\n>\n> drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 6 ++++++\n> 1 file changed, 6 insertions(+)\n>\n> -- \n> 2.53.0\n>\n>\n> -- \n> kernel-team mailing list\n> kernel-team@lists.ubuntu.com\n> https://lists.ubuntu.com/mailman/listinfo/kernel-team","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=lO2aCzWV;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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boundary=\"=-=-=\"","X-BeenThere":"kernel-team@lists.ubuntu.com","X-Mailman-Version":"2.1.20","Precedence":"list","List-Id":"Kernel team discussions ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3675994,"web_url":"http://patchwork.ozlabs.org/comment/3675994/","msgid":"<87ldeusp6c.fsf@gmail.com>","list_archive_url":null,"date":"2026-04-10T17:25:31","subject":"APPLIED: [SRU][Q][PATCH 0/2] BUG: kernel NULL pointer dereference\n in amdgpu(regression)","submitter":{"id":89305,"url":"http://patchwork.ozlabs.org/api/people/89305/","name":"Mehmet Basaran","email":"mehmet.basaran@canonical.com"},"content":"Applied to questing:linux master-next branch. Thanks.\nAceLan Kao writes:\n\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2144577\n>\n> [Impact]\n> System freezes during boot on machines with AMD Southern Islands (SI) GPUs\n> using the amdgpu driver\n> .\n> The amdgpu driver calls flush_gpu_tlb_pasid() in a workqueue, but on SI\n> hardware this function pointer is NULL. The kernel hits a NULL pointer\n> dereference in amdgpu_gmc_flush_gpu_tlb_pasid() and crashes.\n>\n> Error log:\n> kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000\n> kernel: Workqueue: events amdgpu_tlb_fence_work [amdgpu]\n> kernel: RIP: 0010:0x0\n> kernel: Call Trace:\n> kernel: amdgpu_gmc_flush_gpu_tlb_pasid+0xfd/0x480 [amdgpu]\n> kernel: amdgpu_tlb_fence_work+0x77/0x110 [amdgpu]\n>\n> Hits every boot on affected hardware. Regression from 6.17.0-14 to 6.17.0-19.\n>\n> [Fix]\n> Two patches fix this together:\n> 1. f4db9913e4d3 (\"drm/amdgpu: validate the flush_gpu_tlb_pasid()\")\n> Adds a NULL check for flush_gpu_tlb_pasid before calling it.\n> Upstream in v7.0-rc1.\n> 2. e3a6eff92bbd (\"drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\")\n> Fixes the first patch — the early return skipped the unlock, causing\n> a deadlock. Changes the bare return to a goto that unlocks first.\n> Upstream in v7.0-rc1.\n> Fixes: f4db9913e4d3\n>\n> [Test Plan]\n> On a machine with an AMD SI GPU (Tahiti, Pitcairn, Verde, Oland, Hainan)\n> booted with amdgpu.si_support=1:\n>\n> $ sudo reboot\n>\n> Without patches: kernel NULL pointer dereference during boot, system freezes.\n> With patches: system boots normally, no crash or error in dmesg.\n>\n> Check dmesg after boot:\n> $ dmesg | grep -i \"BUG\\|NULL pointer\\|amdgpu\"\n>\n> Without patches: \"BUG: kernel NULL pointer dereference\" present.\n> With patches: no BUG or NULL pointer lines.\n>\n> [Where problems could occur]\n> Could break TLB flushing on amdgpu.\n>\n> If the NULL check gates too broadly, TLB flushes could be skipped on GPUs\n> that do have flush_gpu_tlb_pasid. This would cause stale TLB entries and\n> GPU page faults or rendering corruption.\n>\n> The unlock path change in the second patch touches the reset/lock logic in\n> amdgpu_gmc_flush_gpu_tlb_pasid(). A wrong goto target could leave the\n> reset domain lock held, deadlocking the GPU.\n>\n> [Other Info]\n> Both patches are upstream in v7.0-rc1.\n>\n> Prike Liang (1):\n> drm/amdgpu: validate the flush_gpu_tlb_pasid()\n>\n> Timur Kristóf (1):\n> drm/amdgpu: Fix validating flush_gpu_tlb_pasid()\n>\n> drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 6 ++++++\n> 1 file changed, 6 insertions(+)\n>\n> -- \n> 2.53.0\n>\n>\n> -- \n> kernel-team mailing list\n> kernel-team@lists.ubuntu.com\n> https://lists.ubuntu.com/mailman/listinfo/kernel-team","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=G3PyhXgI;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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