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AJvYcCX/948xJzzI93YcNjIl3eJX4uREURXFhWnwOchIfVE8mqAVjgPOAE4p7xF6IyBrDRmOb8K+px75Ix5cWPU=@vger.kernel.org X-Gm-Message-State: AOJu0YyoNITdIyhdYXMqddeNTmoA7R3kZJ8Xb9+Vk1ks5TxKiRiAssfl iZmXnfAchV9uaCEAkxctUG+N/c2ARxinppw6nLYotDlSH/I3v8mh3oDCVcy0K+f/mTv7tONEC0C LFbKEWO/HDfTncXMNB2BGsfoifZCyLE0ZNcW9RDJqstjqftzoh+Wj7xBkz3c= X-Google-Smtp-Source: AGHT+IFOtEwoW+pIIgXzo3NIwMKX8VH8wayWU79dvKMTTDNcHt64bMPJql7UtkDElqdMDzXnG4soPcCYRJTAKBtOVi0Hz4a/J1il Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1445:b0:3df:2cd1:f61b with SMTP id e9e14a558f8ab-3e282c5298fmr65746315ab.0.1752779612874; Thu, 17 Jul 2025 12:13:32 -0700 (PDT) Date: Thu, 17 Jul 2025 12:13:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68794b5c.a70a0220.693ce.0050.GAE@google.com> Subject: [syzbot] [mm?] BUG: unable to handle kernel paging request in move_pages From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e8352908bdcd Add linux-next specific files for 20250716 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=17f81382580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7b0e60e17dc5717 dashboard link: https://syzkaller.appspot.com/bug?extid=b446dbe27035ef6bd6c2 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10041382580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10eb158c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ae8cc81c1781/disk-e8352908.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/57aaea991896/vmlinux-e8352908.xz kernel image: https://storage.googleapis.com/syzbot-assets/feb871619bd4/bzImage-e8352908.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b446dbe27035ef6bd6c2@syzkaller.appspotmail.com BUG: unable to handle page fault for address: ffffea6000391008 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 13fff8067 P4D 13fff8067 PUD 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 5860 Comm: syz-executor832 Not tainted 6.16.0-rc6-next-20250716-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] RIP: 0010:move_pages+0xbe6/0x1430 mm/userfaultfd.c:1824 Code: c1 ec 06 4b 8d 1c 2c 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 9a 30 f4 ff <48> 8b 1b 48 89 de 48 83 e6 01 31 ff e8 59 70 8f ff 48 89 d8 48 83 RSP: 0018:ffffc90003f778a8 EFLAGS: 00010246 RAX: 1ffffd4c00072201 RBX: ffffea6000391008 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520007eef00 R12: 0000006000391000 R13: ffffea0000000000 R14: 200018000e4401fd R15: 00002000003ab000 FS: 00007ff35708f6c0(0000) GS:ffff8881258aa000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffea6000391008 CR3: 0000000074390000 CR4: 00000000003526f0 Call Trace: userfaultfd_move fs/userfaultfd.c:1923 [inline] userfaultfd_ioctl+0x2e8b/0x4c80 fs/userfaultfd.c:2046 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff3570d6519 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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:00007ff35708f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff357160308 RCX: 00007ff3570d6519 RDX: 0000200000000180 RSI: 00000000c028aa05 RDI: 0000000000000003 RBP: 00007ff357160300 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff35712d074 R13: 0000200000000180 R14: 0000200000000188 R15: 00002000002b9000 Modules linked in: CR2: ffffea6000391008 ---[ end trace 0000000000000000 ]--- RIP: 0010:_compound_head include/linux/page-flags.h:284 [inline] RIP: 0010:move_pages+0xbe6/0x1430 mm/userfaultfd.c:1824 Code: c1 ec 06 4b 8d 1c 2c 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 9a 30 f4 ff <48> 8b 1b 48 89 de 48 83 e6 01 31 ff e8 59 70 8f ff 48 89 d8 48 83 RSP: 0018:ffffc90003f778a8 EFLAGS: 00010246 RAX: 1ffffd4c00072201 RBX: ffffea6000391008 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520007eef00 R12: 0000006000391000 R13: ffffea0000000000 R14: 200018000e4401fd R15: 00002000003ab000 FS: 00007ff35708f6c0(0000) GS:ffff8881258aa000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffea6000391008 CR3: 0000000074390000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: c1 ec 06 shr $0x6,%esp 3: 4b 8d 1c 2c lea (%r12,%r13,1),%rbx 7: 48 83 c3 08 add $0x8,%rbx b: 48 89 d8 mov %rbx,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 19: fc ff df 1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 20: 74 08 je 0x2a 22: 48 89 df mov %rbx,%rdi 25: e8 9a 30 f4 ff call 0xfff430c4 * 2a: 48 8b 1b mov (%rbx),%rbx <-- trapping instruction 2d: 48 89 de mov %rbx,%rsi 30: 48 83 e6 01 and $0x1,%rsi 34: 31 ff xor %edi,%edi 36: e8 59 70 8f ff call 0xff8f7094 3b: 48 89 d8 mov %rbx,%rax 3e: 48 rex.W 3f: 83 .byte 0x83 --- 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