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SMTP id 5614622812f47-4d728717c0fmr1913863b6e.8.1790226037068; Wed, 23 Sep 2026 22:00:37 -0700 (PDT) Date: Wed, 23 Sep 2026 22:00:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab4ae75.80e1c6cc.1e8e5f.000d.GAE@google.com> Subject: [syzbot] [mm?] [ext4?] WARNING in __folio_set_anon From: syzbot To: akpm@linux-foundation.org, david@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, liam@infradead.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 38872197cae2 Merge branch 'for-next/fixes' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=17a44d25580000 kernel config: https://syzkaller.appspot.com/x/.config?x=56ed23170c168d4c dashboard link: https://syzkaller.appspot.com/bug?extid=c181d3198e98f8aef8b9 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a36515580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16dcf4c9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c5963fdd6790/disk-38872197.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a8c2cab00c45/vmlinux-38872197.xz kernel image: https://storage.googleapis.com/syzbot-assets/bde15d173380/Image-38872197.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/c81cc2849c33/mount_3.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=11cb4405580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c181d3198e98f8aef8b9@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: ./include/linux/pagemap.h:1130 at vma_flags_is_cow_mapping include/linux/mm.h:2315 [inline], CPU#1: syz.0.17/4884 WARNING: ./include/linux/pagemap.h:1130 at vma_is_cow_mapping include/linux/mm.h:2329 [inline], CPU#1: syz.0.17/4884 WARNING: ./include/linux/pagemap.h:1130 at linear_anon_page_index include/linux/pagemap.h:1130 [inline], CPU#1: syz.0.17/4884 WARNING: ./include/linux/pagemap.h:1130 at __folio_set_anon+0x240/0x298 mm/rmap.c:1491, CPU#1: syz.0.17/4884 Modules linked in: CPU: 1 UID: 0 PID: 4884 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : linear_anon_page_index include/linux/mm.h:2315 [inline] pc : __folio_set_anon+0x240/0x298 mm/rmap.c:1491 lr : vma_flags_is_cow_mapping include/linux/mm.h:2315 [inline] lr : vma_is_cow_mapping include/linux/mm.h:2329 [inline] lr : linear_anon_page_index include/linux/pagemap.h:1130 [inline] lr : __folio_set_anon+0x240/0x298 mm/rmap.c:1491 sp : ffff800095456de0 x29: ffff800095456df0 x28: 0000000000020000 x27: 1fffe00019e1007c x26: ffff0000cf0803e0 x25: 0000000000020000 x24: dfff800000000000 x23: 0000000020000000 x22: 0000000000000000 x21: 00000000200020d1 x20: ffff0000cf0803c0 x19: fffffdffc3c10000 x18: 00000000ffffffff x17: 0000000000000003 x16: ffff800088b97000 x15: ffff80008a849000 x14: 000000000062064d x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 000000000000003d x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff800080c16020 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800080ab2d0c x2 : 0000000000000000 x1 : ffff0000d07a1d80 x0 : 0000000000000000 Call trace: vma_flags_is_cow_mapping include/linux/mm.h:2315 [inline] (P) vma_is_cow_mapping include/linux/mm.h:2329 [inline] (P) linear_anon_page_index include/linux/pagemap.h:1130 [inline] (P) __folio_set_anon+0x240/0x298 mm/rmap.c:1491 (P) folio_add_new_anon_rmap+0x1a8/0x10ac mm/rmap.c:1663 map_anon_folio_pmd_nopf+0xfc/0x160 mm/huge_memory.c:1365 collapse_huge_page mm/khugepaged.c:1438 [inline] mthp_collapse mm/khugepaged.c:1532 [inline] collapse_scan_pmd mm/khugepaged.c:1781 [inline] collapse_single_pmd+0x21e0/0x3748 mm/khugepaged.c:2797 madvise_collapse+0x2a4/0x6f4 mm/khugepaged.c:3231 madvise_vma_behavior+0x3e8/0x339c mm/madvise.c:1372 madvise_walk_vmas+0x4c8/0x9bc mm/madvise.c:1721 madvise_do_behavior+0x5f0/0x7c0 mm/madvise.c:1916 do_madvise+0x28c/0x2f0 mm/madvise.c:2014 __do_sys_madvise mm/madvise.c:2023 [inline] __se_sys_madvise mm/madvise.c:2021 [inline] __arm64_sys_madvise+0xac/0xc8 mm/madvise.c:2021 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 irq event stamp: 1412 hardirqs last enabled at (1411): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (1411): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 hardirqs last disabled at (1412): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445 softirqs last enabled at (1120): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (1120): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (1120): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797 softirqs last disabled at (1118): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1118): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (1118): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790 ---[ end trace 0000000000000000 ]--- --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup