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([2600:1700:e321:62f0:da43:aeff:fecc:bfd5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29099a7b0c8sm2422495ad.62.2025.10.15.10.48.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Oct 2025 10:48:22 -0700 (PDT) Sender: Guenter Roeck Message-ID: <81c865ca-a9d2-413e-b43d-eedd7e4e88a1@roeck-us.net> Date: Wed, 15 Oct 2025 10:48:21 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Linux 6.18-rc1 To: "Liam R. Howlett" Cc: Linus Torvalds , Linux Kernel Mailing List , Feng Chen , Matthew Wilcox , Jeff Layton , Michal Swiatkowski , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Tao Ren , Lukas Bulwahn , Alexei Starovoitov , Vlastimil Babka References: <68841c19-c54e-4837-80bf-d180f2c35499@roeck-us.net> <3exillpepa4jjxsjkp5vgn4347tsvt7q22m75tp3ncavkyzgl7@juvt3p4h53km> Content-Language: en-US From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAmgrMyQFCSbODQkACgkQyx8mb86fmYGcWRAA oRwrk7V8fULqnGGpBIjp7pvR187Yzx+lhMGUHuM5H56TFEqeVwCMLWB2x1YRolYbY4MEFlQg VUFcfeW0OknSr1s6wtrtQm0gdkolM8OcCL9ptTHOg1mmXa4YpW8QJiL0AVtbpE9BroeWGl9v 2TGILPm9mVp+GmMQgkNeCS7Jonq5f5pDUGumAMguWzMFEg+Imt9wr2YA7aGen7KPSqJeQPpj onPKhu7O/KJKkuC50ylxizHzmGx+IUSmOZxN950pZUFvVZH9CwhAAl+NYUtcF5ry/uSYG2U7 DCvpzqOryJRemKN63qt1bjF6cltsXwxjKOw6CvdjJYA3n6xCWLuJ6yk6CAy1Ukh545NhgBAs rGGVkl6TUBi0ixL3EF3RWLa9IMDcHN32r7OBhw6vbul8HqyTFZWY2ksTvlTl+qG3zV6AJuzT WdXmbcKN+TdhO5XlxVlbZoCm7ViBj1+PvIFQZCnLAhqSd/DJlhaq8fFXx1dCUPgQDcD+wo65 qulV/NijfU8bzFfEPgYP/3LP+BSAyFs33y/mdP8kbMxSCjnLEhimQMrSSo/To1Gxp5C97fw5 3m1CaMILGKCmfI1B8iA8zd8ib7t1Rg0qCwcAnvsM36SkrID32GfFbv873bNskJCHAISK3Xkz qo7IYZmjk/IJGbsiGzxUhvicwkgKE9r7a1rOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAmgrMyQFCSbODQkACgkQyx8mb86fmYHlgg/9 H5JeDmB4jsreE9Bn621wZk7NMzxy9STxiVKSh8Mq4pb+IDu1RU2iLyetCY1TiJlcxnE362kj njrfAdqyPteHM+LU59NtEbGwrfcXdQoh4XdMuPA5ADetPLma3YiRa3VsVkLwpnR7ilgwQw6u dycEaOxQ7LUXCs0JaGVVP25Z2hMkHBwx6BlW6EZLNgzGI2rswSZ7SKcsBd1IRHVf0miwIFYy j/UEfAFNW+tbtKPNn3xZTLs3quQN7GdYLh+J0XxITpBZaFOpwEKV+VS36pSLnNl0T5wm0E/y scPJ0OVY7ly5Vm1nnoH4licaU5Y1nSkFR/j2douI5P7Cj687WuNMC6CcFd6j72kRfxklOqXw zvy+2NEcXyziiLXp84130yxAKXfluax9sZhhrhKT6VrD45S6N3HxJpXQ/RY/EX35neH2/F7B RgSloce2+zWfpELyS1qRkCUTt1tlGV2p+y2BPfXzrHn2vxvbhEn1QpQ6t+85FKN8YEhJEygJ F0WaMvQMNrk9UAUziVcUkLU52NS9SXqpVg8vgrO0JKx97IXFPcNh0DWsSj/0Y8HO/RDkGXYn FDMj7fZSPKyPQPmEHg+W/KzxSSfdgWIHF2QaQ0b2q1wOSec4Rti52ohmNSY+KNIW/zODhugJ np3900V20aS7eD9K8GTU0TGC1pyz6IVJwIE= In-Reply-To: <3exillpepa4jjxsjkp5vgn4347tsvt7q22m75tp3ncavkyzgl7@juvt3p4h53km> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/15/25 10:28, Liam R. Howlett wrote: > + Cc Vlastimil, as you are indicating the slab merge. > > > * Guenter Roeck [251015 06:02]: >> On Mon, Oct 13, 2025 at 09:46:44PM -0700, Guenter Roeck wrote: >>> On Mon, Oct 13, 2025 at 10:08:26AM -0700, Guenter Roeck wrote: >>>> On Sun, Oct 12, 2025 at 02:04:32PM -0700, Linus Torvalds wrote: >>>>> Two weeks have passed, and 6.18-rc1 has been tagged and pushed out. >>>>> >>>>> Things look fairly normal: size-wise this is pretty much right in the >>>>> middle of the pack, and nothing particular stands out in the shortlog >>>>> of merges this merge window appended below. About half the diff is >>>>> drivers, with the res being all over: vfs and filesystems, arch >>>>> updates (although much of that is actually devicetree stuff, so it's >>>>> arguably more driver-related), tooling, rust support etc etc. >>>>> >>>>> This was one of the good merge windows where I didn't end up having to >>>>> bisect any particular problem on nay of the machines I was testing. >>>>> Let's hope that success mostly translates to the bigger picture too. >>>>> >>>> >>>> Test results don't look that good, unfortunately.: >>>> >>> ... >>>> Qemu test results: >>>> total: 609 pass: 581 fail: 28 >>>> Failed tests: >> ... >>>> sheb:rts7751r2dplus_defconfig:initrd >>>> sheb:rts7751r2dplus_defconfig:ata:ext2 >>>> sheb:rts7751r2dplus_defconfig:usb:ext2 >>>> Unit test results: >>>> pass: 655208 fail: 0 >>>> >>> >> >> Update on the sheb (SH4 big endian) failures below. > > What is the qemu line you use and the memory configuration of that qemu, > or is this real hardware? > qemu. I tried 6.2.0, 10.0.5, and 10.1.1. Sample command line: qemu-system-sh4eb -M r2d -kernel arch/sh/boot/zImage \ -append "console=ttySC1,115200 noiotrap" \ -serial null -serial stdio -monitor null -nographic -no-reboot initrd or root file system doesn't really matter because qemu exits almost immediately. > Are there sh4 configs that pass? > little endian - all big endian - none > It's a bit odd it says "fail: 0" here, Is this message about something > else? This are unit (KUNIT) test results. All 655208 executed unit tests passed. Unit tests not executed because the image crashed or because qemu died are not counted as failed. ... >> >> # bad: [ba9dac987319d4f3969691dcf366ef19c9ed8281] Merge tag 'libnvdimm-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm >> # good: [e5f0a698b34ed76002dc5cff3804a61c80233a7a] Linux 6.17 >> git bisect start 'HEAD' 'v6.17' >> # good: [58809f614e0e3f4e12b489bddf680bfeb31c0a20] Merge tag 'drm-next-2025-10-01' of https://gitlab.freedesktop.org/drm/kernel >> git bisect good 58809f614e0e3f4e12b489bddf680bfeb31c0a20 >> # bad: [8804d970fab45726b3c7cd7f240b31122aa94219] Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm >> git bisect bad 8804d970fab45726b3c7cd7f240b31122aa94219 >> # good: [30c3055f9c0d84a67b8fd723bdec9b1b52b3c695] xsk: wrap generic metadata handling onto separate function >> git bisect good 30c3055f9c0d84a67b8fd723bdec9b1b52b3c695 >> # good: [f79e772258df311c2cb21594ca0996318e720d28] Merge tag 'media/v6.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media >> git bisect good f79e772258df311c2cb21594ca0996318e720d28 >> # good: [f1455695d2d99894b65db233877acac9a0e120b9] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net >> git bisect good f1455695d2d99894b65db233877acac9a0e120b9 >> # good: [a16c46c2402026162111ed9fd1fc28d25223443e] dma-remap: drop nth_page() in dma_common_contiguous_remap() >> git bisect good a16c46c2402026162111ed9fd1fc28d25223443e >> # good: [a5883fa94295f1ef2473eadd84cc1e24dab9ae18] selftests/mm: gup_tests: option to GUP all pages in a single call >> git bisect good a5883fa94295f1ef2473eadd84cc1e24dab9ae18 >> # good: [08498be43ee676d8a5eefb22278266322578a3e0] mm/ksm: get mm_slot by mm_slot_entry() when slot is !NULL >> git bisect good 08498be43ee676d8a5eefb22278266322578a3e0 >> # good: [719a42e563bb087758500e43e67a57b27f303c4c] maple_tree: Convert forking to use the sheaf interface >> git bisect good 719a42e563bb087758500e43e67a57b27f303c4c >> # good: [b9120619246d733a27e5e93c29e86f2e0401cfc5] Merge series "SLUB percpu sheaves" >> git bisect good b9120619246d733a27e5e93c29e86f2e0401cfc5 >> # bad: [24d9e8b3c9c8a6f72c8b4c196a703e144928d919] Merge tag 'slab-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab >> git bisect bad 24d9e8b3c9c8a6f72c8b4c196a703e144928d919 >> # good: [83382af9ddc3cb0ef43f67d049b461720ad785e6] slab: Make slub local_(try)lock more precise for LOCKDEP >> git bisect good 83382af9ddc3cb0ef43f67d049b461720ad785e6 >> # good: [af92793e52c3a99b828ed4bdd277fd3e11c18d08] slab: Introduce kmalloc_nolock() and kfree_nolock(). >> git bisect good af92793e52c3a99b828ed4bdd277fd3e11c18d08 >> # good: [ca74b8cadaad4b179f77f1f4dc3d288be9a580f1] Merge series "slab: Re-entrant kmalloc_nolock()" >> git bisect good ca74b8cadaad4b179f77f1f4dc3d288be9a580f1 >> # good: [07fdad3a93756b872da7b53647715c48d0f4a2d0] Merge tag 'net-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next >> git bisect good 07fdad3a93756b872da7b53647715c48d0f4a2d0 >> # first bad commit: [24d9e8b3c9c8a6f72c8b4c196a703e144928d919] Merge tag 'slab-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab >> >> I had to revert commit 719a42e563bb ("maple_tree: Convert forking to use >> the sheaf interface") and commit af92793e52c3 ("slab: Introduce >> kmalloc_nolock() and kfree_nolock()") in the 'slab-for-6.18' branch to fix >> the problem. The first patch can not be reverted in mainline since other >> patches depend on it. > > Both 719a42e563bb and af92793e52c3 are listed as good in your bisect > above. Why are the two commits you name as the cause listed as 'good'? > > What did you revert to get sh4 to work, and from which git branch? > > What do you mean "can not be reverted in mainline"? And which is "the > first patch", I'm assuming the first one you listed (719a42e563bb)? > I checked out a test branch at 24d9e8b3c9c, rebased it on top of 24d9e8b3c9c8a6~1 (07fdad3a93756b8), and ran another bisect. Results: # bad: [c5e19dc4c1db098456ee6a924e276a26e692f26c] slab: Introduce kmalloc_nolock() and kfree_nolock(). # good: [07fdad3a93756b872da7b53647715c48d0f4a2d0] Merge tag 'net-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next git bisect start 'HEAD' '07fdad3a93756b872da7b53647715c48d0f4a2d0' # good: [10f17a5a3befa328bd9a78ca6b799dd1933f108b] maple_tree: remove redundant __GFP_NOWARN git bisect good 10f17a5a3befa328bd9a78ca6b799dd1933f108b # good: [f97515baad5efa6e1963abd37188fad42515edc8] maple_tree: Replace mt_free_one() with kfree() git bisect good f97515baad5efa6e1963abd37188fad42515edc8 # bad: [4df642aa2128c2c346f9c945bddbae37c59bba82] locking/local_lock: Introduce local_lock_is_locked(). git bisect bad 4df642aa2128c2c346f9c945bddbae37c59bba82 # good: [a20be9b8014abfe68acc2efd81bfb5d2dd4eaf34] maple_tree: Prefilled sheaf conversion and testing git bisect good a20be9b8014abfe68acc2efd81bfb5d2dd4eaf34 # bad: [40696586bc008ad34db8135c35ec4b459691af3c] maple_tree: Convert forking to use the sheaf interface git bisect bad 40696586bc008ad34db8135c35ec4b459691af3c # good: [8387347ae261c5e74e9db3f73b91d47f11f8d6f8] maple_tree: Add single node allocation support to maple state git bisect good 8387347ae261c5e74e9db3f73b91d47f11f8d6f8 # first bad commit: [40696586bc008ad34db8135c35ec4b459691af3c] maple_tree: Convert forking to use the sheaf interface Reverting just 40696586bc008 in that branch didn't help. So I reverted "slab: Introduce kmalloc_nolock() and kfree_nolock()" in that branch as well, and the image started passing. In mainline, 719a42e563bb ("maple_tree: Convert forking to use the sheaf interface") can be reverted, but trying to revert af92793e52c3 results in: CONFLICT (content): Merge conflict in mm/slub.c Guenter