Hello, syzbot found the following issue on: HEAD commit: e67572cd2204 Linux 6.9-rc6 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1067d2f8980000 kernel config: https://syzkaller.appspot.com/x/.config?x=3310e643b6ef5d69 dashboard link: https://syzkaller.appspot.com/bug?extid=5ea2845f44caa77f5543 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10874a40980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d3c4905a7f32/disk-e67572cd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9e4d1fc8f9c1/vmlinux-e67572cd.xz kernel image: https://storage.googleapis.com/syzbot-assets/4616b77edaee/bzImage-e67572cd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5ea2845f44caa77f5543@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5288 at arch/x86/include/asm/pgtable.h:403 pte_uffd_wp arch/x86/include/asm/pgtable.h:403 [inline] WARNING: CPU: 1 PID: 5288 at arch/x86/include/asm/pgtable.h:403 hpage_collapse_scan_pmd+0xd32/0x14c0 mm/khugepaged.c:1316 Modules linked in: CPU: 1 PID: 5288 Comm: syz-executor.4 Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:pte_uffd_wp arch/x86/include/asm/pgtable.h:403 [inline] RIP: 0010:hpage_collapse_scan_pmd+0xd32/0x14c0 mm/khugepaged.c:1316 Code: 90 90 e9 4b f6 ff ff 4c 8b 64 24 48 e8 f7 ee 9e ff 31 ff 4c 89 ee e8 fd e9 9e ff 4d 85 ed 0f 84 b5 01 00 00 e8 df ee 9e ff 90 <0f> 0b 90 41 be 09 00 00 00 0f b6 6c 24 47 48 8b 5c 24 10 e9 fb fa RSP: 0018:ffffc90003abf9b0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88807a402000 RCX: ffffffff81eed643 RDX: ffff888021ddbc00 RSI: ffffffff81eed651 RDI: 0000000000000007 RBP: 000000006897fc67 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000002 R12: 0000000020800000 R13: 0000000000000002 R14: 0000000000000400 R15: ffff88801e4dcc00 FS: 00007fd661dde6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7e57ed9ba1 CR3: 0000000025328000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> madvise_collapse+0x738/0xb10 mm/khugepaged.c:2761 madvise_vma_behavior+0x202/0x1b20 mm/madvise.c:1074 madvise_walk_vmas+0x1cf/0x2c0 mm/madvise.c:1248 do_madvise+0x309/0x640 mm/madvise.c:1428 __do_sys_madvise mm/madvise.c:1441 [inline] __se_sys_madvise mm/madvise.c:1439 [inline] __x64_sys_madvise+0xa9/0x110 mm/madvise.c:1439 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd66227dea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd661dde0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fd6623ac050 RCX: 00007fd66227dea9 RDX: 0000000000000019 RSI: 00000000dfc3efff RDI: 00000000203c1000 RBP: 00007fd6622ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd6623ac050 R15: 00007ffd98c8dfa8 </TASK> --- 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@xxxxxxxxxxxxxxxx. 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
