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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8f5ae30d69d7 Linux 6.17-rc1 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=1568cc34580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb dashboard link: https://syzkaller.appspot.com/bug?extid=3f9768ec54c86997ddfb compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=132b19a2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164da842580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3f9768ec54c86997ddfb@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6777 at mm/page_alloc.c:5124 __alloc_frozen_pages_noprof+0xd0/0x318 mm/page_alloc.c:5124 Modules linked in: CPU: 1 UID: 0 PID: 6777 Comm: syz.0.17 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 pstate: 23400005 (nzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __alloc_frozen_pages_noprof+0xd0/0x318 mm/page_alloc.c:5124 lr : __alloc_frozen_pages_noprof+0xac/0x318 mm/page_alloc.c:5118 sp : ffff8000a3d575e0 x29: ffff8000a3d576b0 x28: 1fffe00018f73d00 x27: ffff8000a3d57980 x26: 1ffff00012eb431c x25: dfff800000000000 x24: ffff8000a3d57600 x23: ffff7000147aaec0 x22: 0000000000000000 x21: 0000000000040d40 x20: 0000000000000000 x19: 0000000000000024 x18: 1fffe000337a0688 x17: ffff0001fea8c8b0 x16: ffff80008af6de48 x15: 0000000000000005 x14: 1ffff000147aaec4 x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000147aaec9 x10: dfff800000000000 x9 : 0000000000000001 x8 : ffff800092df4000 x7 : 0000000000000000 x6 : ffff8000802312a4 x5 : ffff0000c7b3db38 x4 : 0000000000000000 x3 : 0000000000000020 x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __alloc_frozen_pages_noprof+0xd0/0x318 mm/page_alloc.c:5124 (P) alloc_pages_mpol+0x1e4/0x460 mm/mempolicy.c:2416 alloc_frozen_pages_noprof+0xe0/0x210 mm/mempolicy.c:2487 ___kmalloc_large_node+0xac/0x154 mm/slub.c:4306 __kmalloc_large_node_noprof+0x2c/0x8c mm/slub.c:4337 __do_kmalloc_node mm/slub.c:4353 [inline] __kmalloc_noprof+0x3bc/0x4c8 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] v9fs_fid_get_acl+0x64/0x114 fs/9p/acl.c:32 __v9fs_get_acl fs/9p/acl.c:66 [inline] v9fs_get_acl+0xa8/0x3ac fs/9p/acl.c:92 v9fs_qid_iget_dotl fs/9p/vfs_inode_dotl.c:131 [inline] v9fs_inode_from_fid_dotl+0x1d8/0x26c fs/9p/vfs_inode_dotl.c:154 v9fs_get_new_inode_from_fid fs/9p/v9fs.h:251 [inline] v9fs_mount+0x5b8/0x910 fs/9p/vfs_super.c:144 legacy_get_tree+0xd4/0x16c fs/fs_context.c:666 vfs_get_tree+0x90/0x28c fs/super.c:1815 do_new_mount+0x278/0x7f4 fs/namespace.c:3805 path_mount+0x5b4/0xde0 fs/namespace.c:4120 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount fs/namespace.c:4321 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4321 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 3156 hardirqs last enabled at (3155): [] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234 hardirqs last disabled at (3156): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (2974): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (2974): [] bdi_register_va+0x534/0x7e4 mm/backing-dev.c:1114 softirqs last disabled at (2972): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (2972): [] bdi_register_va+0x320/0x7e4 mm/backing-dev.c:1104 ---[ 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