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Wed, 22 Jul 2026 06:20:40 -0700 (PDT) Date: Wed, 22 Jul 2026 06:20:40 -0700 In-Reply-To: <20260721-generic-set-memory-v0-1-v1-0-2c1fc62306b3@kernel.org> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a60c3a8.42649fcc.22d900.0013.GAE@google.com> Subject: [syzbot ci] Re: arch, mm: create a generic set_memory/change_page_attr core From: syzbot ci To: akpm@linux-foundation.org, aou@eecs.berkeley.edu, bp@alien8.de, catalin.marinas@arm.com, chenhuacai@kernel.org, dave.hansen@intel.com, dave.hansen@linux.intel.com, david@kernel.org, hpa@zytor.com, jackmanb@google.com, jgross@suse.com, kevin.brodsky@arm.com, liam@infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, ljs@kernel.org, loongarch@lists.linux.dev, luto@kernel.org, mhocko@suse.com, mingo@kernel.org, mingo@redhat.com, palmer@dabbelt.com, peterz@infradead.org, pjw@kernel.org, rppt@kernel.org, surenb@google.com, tglx@kernel.org, vbabka@kernel.org, will@kernel.org, x86@kernel.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] arch, mm: create a generic set_memory/change_page_attr core https://lore.kernel.org/all/20260721-generic-set-memory-v0-1-v1-0-2c1fc62306b3@kernel.org * [PATCH RFC 01/18] x86/mm/pat: Don't gate cpa_lock on debug_pagealloc_enabled() * [PATCH RFC 02/18] x86/mm/pat: fix effective RW computation in lookup_address_in_pgd_attr() * [PATCH RFC 03/18] x86/mm/pat: replace x86-speficic pg_level with generic pgtable_level * [PATCH RFC 04/18] x86/mm/pat: use page table accessors for effective RW/NX bits * [PATCH RFC 05/18] x86/mm/pat: use a generic helper for the large page size * [PATCH RFC 06/18] x86/mm/pat: introduce an inline helper to check if alias needs update * [PATCH RFC 07/18] x86/mm/pat: introduce cpa_handle_large_page() * [PATCH RFC 08/18] x86/mm/pat: use cpa_split_data structure to pass split parameters * [PATCH RFC 09/18] x86/mm/pat: use a single locked lookup for PTE verification * [PATCH RFC 10/18] x86/mm/pat: move the large page size calculation to should_split_large_page * [PATCH RFC 11/18] x86/mm/pat, mm: set_memory: pull change_page_attr() core to mm/ * [PATCH RFC 12/18] x86/pat/mm, mm/set_memory: abstract the CPA page table lock * [PATCH RFC 13/18] mm/set_memory: read page table entries with pXdp_get() * [PATCH RFC 14/18] x86/mm/pat, mm: move cpa-test to mm * [PATCH RFC 15/18] riscv: convert set_memory to the generic CPA implementation * [PATCH RFC 16/18] riscv: make set_direct_map_*_noflush actually noflush * [PATCH RFC 17/18] loongarch: convert set_memory to the generic CPA implementation * [PATCH RFC 18/18] loongarch: make set_direct_map_*_noflush actually noflush and found the following issue: WARNING in arch_should_split_large_page Full report is available here: https://ci.syzbot.org/series/08799ddb-4fca-4e5c-a2a7-a16eb2845851 *** WARNING in arch_should_split_large_page tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: dc59e4fea9d83f03bad6bddf3fa2e52491777482 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/9a435490-f68f-4ca0-96ae-457a5caa17e6/config Demotion targets for Node 1: null debug_vm_pgtable: [debug_vm_pgtable ]: Validating architecture page table helpers Key type .fscrypt registered Key type fscrypt-provisioning registered kAFS: Red Hat AFS client v0.1 registering. Btrfs loaded, assert=on, zoned=yes, fsverity=yes Key type big_key registered Key type encrypted registered AppArmor: AppArmor sha256 policy hashing enabled ima: No TPM chip found, activating TPM-bypass! Loading compiled-in module X.509 certificates Loaded X.509 cert 'Build time autogenerated kernel key: dc5bfa299b381f3c121e230b24acaec0874c302b' ima: Allocated hash algorithm: sha256 ima: No architecture policies found evm: Initialising EVM extended attributes: evm: security.selinux (disabled) evm: security.SMACK64 (disabled) evm: security.SMACK64EXEC (disabled) evm: security.SMACK64TRANSMUTE (disabled) evm: security.SMACK64MMAP (disabled) evm: security.apparmor evm: security.ima evm: security.capability evm: HMAC attrs: 0x1 PM: Magic number: 2:551:79 netconsole: network logging started gtp: GTP module loaded (pdp ctx size 128 bytes) rdma_rxe: loaded cfg80211: Loading compiled-in X.509 certificates for regulatory database Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600' clk: Disabling unused clocks ALSA device list: #0: Dummy 1 #1: Loopback 1 #2: Virtual MIDI Card 1 md: Waiting for all devices to be available before autodetect md: If you don't use raid, use raid=noautodetect md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. EXT4-fs (sda1): mounted filesystem b4773fba-1738-4da0-8a90-0fe043d0a496 ro with ordered data mode. Quota mode: none. VFS: Mounted root (ext4 filesystem) readonly on device 8:1. devtmpfs: mounted VFS: Pivoted into new rootfs Freeing unused kernel image (initmem) memory: 26964K Write protecting the kernel read-only data: 221184k Testing CPA: undo ffffffff81000000-ffffffff8e800000 ------------[ cut here ]------------ CPA detected W^X violation: 00000000000001a1 -> 00000000000001a3 range: 0xffffffff81000000 - 0xffffffff811fffff PFN 1000 WARNING: arch/x86/mm/pat/set_memory.c:601 at arch_should_split_large_page+0x493/0x710, CPU#0: swapper/0/1 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:arch_should_split_large_page+0x49e/0x710 Code: 00 48 8b 44 24 20 48 25 00 f0 ff ff 48 8b 4c 24 08 4c 8d 04 08 49 ff c8 48 8d 3d 4d 66 e1 0e 4c 89 ee 48 89 ea 4c 8b 4c 24 18 <67> 48 0f b9 3a eb 05 e8 46 37 4d 00 4c 89 f7 48 89 ee e8 9b 39 4d RSP: 0000:ffffc900000679f0 EFLAGS: 00010296 RAX: 0000000000200000 RBX: 0000000000000123 RCX: ffffffff81000000 RDX: 00000000000001a3 RSI: 00000000000001a1 RDI: ffffffff905a8280 RBP: 00000000000001a3 R08: ffffffff811fffff R09: 0000000000001000 R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000002 R13: 00000000000001a1 R14: 00000000000001a3 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff88818d95a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000e946000 CR4: 00000000000006f0 Call Trace: __change_page_attr_set_clr+0x936/0x12d0 change_page_attr_set_clr+0x3ac/0x450 set_memory_rw+0x8c/0xd0 mark_rodata_ro+0xf0/0x140 kernel_init+0x4e/0x1d0 ret_from_fork+0x514/0xb70 ret_from_fork_asm+0x1a/0x30 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.