[{"id":3674608,"web_url":"http://patchwork.ozlabs.org/comment/3674608/","msgid":"<549c2498-199e-4ccb-8903-a13544bfe787@canonical.com>","list_archive_url":null,"date":"2026-04-08T07:25:20","subject":"ACK: [SRU][R][PATCH 0/1] System doesn't response with mt76 call trace","submitter":{"id":92836,"url":"http://patchwork.ozlabs.org/api/people/92836/","name":"Yufeng Gao","email":"yufeng.gao@canonical.com"},"content":"On 8/4/26 10:43, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2137448\n>\n> [Impact]\n> On Dell systems with MediaTek MT7925 WiFi cards (mt7925e driver), the system becomes unresponsive during firmware testing and high-load situations due to a deadlock in the mt76 driver. The system shows \"workqueue hogging CPU\" messages followed by system hang, preventing completion of certification testing.\n>\n> The issue occurs because:\n> 1. Two workqueue functions (ps_work and mac_work) attempt to cancel each other using cancel_delayed_work_sync()\n> 2. In high-load situations, both works get queued but cannot execute until CPUs are available\n> 3. When CPUs become available, both work functions may run simultaneously, each trying to synchronously cancel the other, resulting in a deadlock\n>\n> The call path that creates the circular dependency is:\n> mt792x_mac_work() -> ... -> cancel_delayed_work_sync(&pm->ps_work);\n> mt792x_pm_power_save_work() -> cancel_delayed_work_sync(&mphy->mac_work);\n>\n> [Fix]\n> Replace cancel_delayed_work_sync() with cancel_delayed_work() in the mt792x_pm_power_save_work() function to eliminate the deadlock condition.\n>\n> Upstream commit (submitted to linux-wireless):\n> https://patchwork.kernel.org/project/linux-wireless/patch/20251215122231.3180648-1-leon.yen@mediatek.com/\n>\n> In linux-next:\n> bb2f07819d063 wifi: mt76: mt792x: Fix a potential deadlock in high-load situations\n>\n> The non-synchronous cancel is safe here because:\n> - The work cancellation is part of the power-save flow, not a critical cleanup path\n> - Avoiding synchronous wait prevents the circular dependency that causes the deadlock\n> - The code becomes simpler and easier to maintain\n>\n> [Test Plan]\n> On a Dell system with MediaTek MT7925 WiFi (or similar affected platform):\n>\n> 1. Install fwts if not already available:\n> $ sudo apt-get install fwts\n>\n> 2. Monitor system logs in a separate terminal:\n> $ sudo dmesg -w\n>\n> 3. Run the firmware test cases that previously triggered the deadlock:\n>\n> $ sudo fwts wakealarm\n> $ sudo fwts uefirtvariable\n> $ sudo fwts oops\n>\n> Or run a comprehensive diagnostic test:\n> $ sudo fwts --log-level=high -r stdout\n>\n> 4. Check for symptoms during and after the tests:\n>\n> Without the fix, you would see:\n> - \"Message 00020080 (seq N) timeout\" from mt7925e\n> - \"workqueue: vmstat_update hogged CPU for >10000us\" warnings\n> - \"workqueue: psi_avgs_work hogged CPU for >10000us\" warnings\n> - WARNING traces in iommu_dma_unmap_page\n> - System becoming unresponsive\n>\n> With the fix, these symptoms should not occur and the system should remain responsive.\n>\n> 5. Run extended stress testing with WiFi activity during high CPU load:\n> $ stress-ng --cpu 128 --timeout 300s &\n> $ ping -f # flood ping to generate WiFi traffic\n>\n> The system should remain stable without deadlocks.\n>\n> [Where problems could occur]\n> This change affects the MediaTek MT792x WiFi driver's power management and workqueue interaction on systems with mt7925e and similar chipsets.\n>\n> Potential issues if the non-synchronous cancel is not safe in this context:\n> - If there are assumptions in the code that mac_work must be fully stopped before proceeding, using non-synchronous cancel might allow mac_work to run concurrently with subsequent operations, potentially causing race conditions\n> - The mac_work might access hardware or data structures that ps_work assumes are quiescent after the cancel call, leading to unexpected behavior or crashes\n> - Power management state transitions might become inconsistent if mac_work completes after ps_work has already proceeded with its power-save operations\n>\n> However, these risks are mitigated by:\n> - The change is intentional and authored by MediaTek engineers who maintain the driver\n> - The alternative (synchronous cancel) creates a known deadlock issue with 60% reproduction rate\n> - The workqueue subsystem provides inherent protection against most race conditions\n> - Similar patterns are used elsewhere in the kernel where work items need to coordinate\n>\n> The impact is limited to:\n> - Systems with MediaTek MT792x series WiFi chipsets (mt7921, mt7925, etc.)\n> - Primarily affects high-load scenarios where both work items are queued simultaneously\n> - Does not affect other wireless drivers or systems without these chipsets\n> Leon Yen (1):\n> wifi: mt76: mt792x: Fix a potential deadlock in high-load situations\n>\n> drivers/net/wireless/mediatek/mt76/mt792x_mac.c | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\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=iVxekpvR;\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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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3674679,"web_url":"http://patchwork.ozlabs.org/comment/3674679/","msgid":"<7mls5el7jh4mywz6nqk6rw7t535arswpw33uulor6w6adredmj@q4do2ah2syug>","list_archive_url":null,"date":"2026-04-08T09:35:30","subject":"APPLIED[R]: Re: [SRU][R][PATCH 0/1] System doesn't response with\n mt76 call trace","submitter":{"id":7245,"url":"http://patchwork.ozlabs.org/api/people/7245/","name":"Paolo Pisati","email":"paolo.pisati@canonical.com"},"content":"On Wed, Apr 08, 2026 at 08:43:32AM +0800, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n> \n> BugLink: https://bugs.launchpad.net/bugs/2137448\n\nApplied.","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=oCXfEU6u;\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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