Hello, syzbot found the following issue on: HEAD commit: fe57d0d86f03 Add linux-next specific files for 20230710 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=14d46ed8a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=eaa6217eed71d333 dashboard link: https://syzkaller.appspot.com/bug?extid=42309678e0bc7b32f8e9 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b63e18a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13784d64a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9e7627fb1623/disk-fe57d0d8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/848a690045db/vmlinux-fe57d0d8.xz kernel image: https://storage.googleapis.com/syzbot-assets/36e5c3ae635e/bzImage-fe57d0d8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+42309678e0bc7b32f8e9@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ kernel BUG at mm/userfaultfd.c:573! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5031 Comm: syz-executor410 Not tainted 6.5.0-rc1-next-20230710-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:mfill_atomic mm/userfaultfd.c:573 [inline] RIP: 0010:mfill_atomic_copy+0x9ed/0x17e0 mm/userfaultfd.c:725 Code: 8d 8c 24 a8 00 00 00 4c 89 e7 e8 be 54 d9 ff 4c 63 f0 e9 71 fc ff ff e8 51 eb a1 ff 0f 0b e8 4a eb a1 ff 0f 0b e8 43 eb a1 ff <0f> 0b e8 3c eb a1 ff 0f 0b 49 c7 c6 ef ff ff ff e9 54 fd ff ff e8 RSP: 0018:ffffc9000395fb48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88801f67bb80 RSI: ffffffff81e32bad RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000006 R09: ffffffffffffffff R10: 0000000005ffffff R11: 0000000000000001 R12: 0000200000000000 R13: 00005ffffffff001 R14: ffffffffffffffff R15: 0000000005ffffff FS: 00005555571e03c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000060 CR3: 000000002ba7a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> userfaultfd_copy fs/userfaultfd.c:1766 [inline] userfaultfd_ioctl+0xe43/0x4c40 fs/userfaultfd.c:2098 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2e41c4b4b9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff13a95188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff13a95198 RCX: 00007f2e41c4b4b9 RDX: 0000000020000040 RSI: 00000000c028aa03 RDI: 0000000000000003 RBP: 00007fff13a95190 R08: 00007fff13a95190 R09: 00007f2e41c0e380 R10: 00007fff13a95190 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mfill_atomic mm/userfaultfd.c:573 [inline] RIP: 0010:mfill_atomic_copy+0x9ed/0x17e0 mm/userfaultfd.c:725 Code: 8d 8c 24 a8 00 00 00 4c 89 e7 e8 be 54 d9 ff 4c 63 f0 e9 71 fc ff ff e8 51 eb a1 ff 0f 0b e8 4a eb a1 ff 0f 0b e8 43 eb a1 ff <0f> 0b e8 3c eb a1 ff 0f 0b 49 c7 c6 ef ff ff ff e9 54 fd ff ff e8 RSP: 0018:ffffc9000395fb48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88801f67bb80 RSI: ffffffff81e32bad RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000006 R09: ffffffffffffffff R10: 0000000005ffffff R11: 0000000000000001 R12: 0000200000000000 R13: 00005ffffffff001 R14: ffffffffffffffff R15: 0000000005ffffff FS: 00005555571e03c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000060 CR3: 000000002ba7a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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 bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
