Hello, syzbot found the following issue on: HEAD commit: 1b66c114d161 Merge tag 'nfsd-6.4-1' of git://git.kernel.or.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10ef2e5a280000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac0db1213414a978 dashboard link: https://syzkaller.appspot.com/bug?extid=7a9bbb158a7a1071eb27 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=136b9e86280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a85bd6280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ac769e66fb5a/disk-1b66c114.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bee287306a14/vmlinux-1b66c114.xz kernel image: https://storage.googleapis.com/syzbot-assets/342e345ae447/bzImage-1b66c114.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7a9bbb158a7a1071eb27@xxxxxxxxxxxxxxxxxxxxxxxxx RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fec20228c89 RDX: 0000000001000002 RSI: 0000000000400000 RDI: 0000000020000000 RBP: 00007fff16e19850 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000011012 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:142! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5004 Comm: syz-executor464 Not tainted 6.4.0-rc2-syzkaller-00015-g1b66c114d161 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 RIP: 0010:__page_table_check_zero+0x175/0x1c0 mm/page_table_check.c:142 Code: 24 08 80 38 00 75 47 48 03 2d f7 d4 04 10 49 83 c4 01 e9 00 ff ff ff e8 79 50 a2 ff 0f 0b e8 72 50 a2 ff 0f 0b e8 6b 50 a2 ff <0f> 0b e8 64 50 a2 ff 0f 0b e8 5d 50 a2 ff 48 89 ef 48 83 c4 10 5b RSP: 0018:ffffc90003b3fa10 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8880220c0000 RSI: ffffffff81e1f265 RDI: 0000000000000005 RBP: ffff888016090000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 1ffffffff18f47c1 R12: 0000000000000000 R13: 000000000000000a R14: 0000000000000400 R15: dffffc0000000000 FS: 00005555572c2300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000064392c CR3: 000000007abec000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> page_table_check_free include/linux/page_table_check.h:46 [inline] free_pages_prepare mm/page_alloc.c:1303 [inline] __free_pages_ok+0x9c8/0x1060 mm/page_alloc.c:1441 hcd_buffer_free+0x1b9/0x250 drivers/usb/core/buffer.c:163 usb_free_coherent+0x6b/0x80 drivers/usb/core/usb.c:1035 dec_usb_memory_use_count+0x253/0x3f0 drivers/usb/core/devio.c:197 usbdev_mmap+0x8d8/0xc40 drivers/usb/core/devio.c:277 call_mmap include/linux/fs.h:1873 [inline] mmap_region+0x694/0x28d0 mm/mmap.c:2652 do_mmap+0x831/0xf60 mm/mmap.c:1394 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1440 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: 0033:0x7fec20228c89 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:00007fff16e19838 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fec20228c89 RDX: 0000000001000002 RSI: 0000000000400000 RDI: 0000000020000000 RBP: 00007fff16e19850 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000011012 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__page_table_check_zero+0x175/0x1c0 mm/page_table_check.c:142 Code: 24 08 80 38 00 75 47 48 03 2d f7 d4 04 10 49 83 c4 01 e9 00 ff ff ff e8 79 50 a2 ff 0f 0b e8 72 50 a2 ff 0f 0b e8 6b 50 a2 ff <0f> 0b e8 64 50 a2 ff 0f 0b e8 5d 50 a2 ff 48 89 ef 48 83 c4 10 5b RSP: 0018:ffffc90003b3fa10 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8880220c0000 RSI: ffffffff81e1f265 RDI: 0000000000000005 RBP: ffff888016090000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 1ffffffff18f47c1 R12: 0000000000000000 R13: 000000000000000a R14: 0000000000000400 R15: dffffc0000000000 FS: 00005555572c2300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056248b8b7008 CR3: 000000007abec000 CR4: 00000000003506f0 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
