linux-kernel - Re: [syzbot] [usb] kernel BUG in __page_table_check

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Message-ID: <0000000000002fbb830609ce1b6b@google.com>
Date:   Fri, 10 Nov 2023 07:38:04 -0800
From:   syzbot <syzbot+7a9bbb158a7a1071eb27@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        yuran.pereira@...mail.com
Subject: Re: [syzbot] [usb] kernel BUG in __page_table_check_zero

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in __page_table_check_zero

RBP: 00007f6cf0ffe120 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000011012 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f6cf1d9bf80 R15: 00007ffc98ff0338
 </TASK>
==> if* vma_use_count 1
------------[ cut here ]------------
kernel BUG at mm/page_table_check.c:146!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5467 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-15859-g89cdf9d55601-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:__page_table_check_zero+0x2d5/0x4a0 mm/page_table_check.c:146
Code: 98 ff 48 ff cb e9 b5 fd ff ff e8 e6 9f 98 ff 48 ff cb e9 27 fe ff ff e8 d9 9f 98 ff 0f 0b e8 d2 9f 98 ff 0f 0b e8 cb 9f 98 ff <0f> 0b f3 0f 1e fa 4c 89 f6 48 81 e6 ff 0f 00 00 31 ff e8 f4 a3 98
RSP: 0018:ffffc900049f7800 EFLAGS: 00010293
RAX: ffffffff81f620c5 RBX: dffffc0000000000 RCX: ffff8880263f1dc0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880160ea044
RBP: ffff8880160ea044 R08: ffff8880160ea047 R09: 1ffff11002c1d408
R10: dffffc0000000000 R11: ffffed1002c1d409 R12: 0000000000000000
R13: 1ffffffff243299c R14: 000000000000000a R15: ffff8880160ea000
FS:  00007f6cf0ffe6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f9eb7b1680 CR3: 000000001d34c000 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:41 [inline]
 free_pages_prepare mm/page_alloc.c:1138 [inline]
 __free_pages_ok+0xc43/0xd70 mm/page_alloc.c:1267
 dec_usb_memory_use_count+0x259/0x350 drivers/usb/core/devio.c:198
 usbdev_mmap+0x89e/0x9d0
 call_mmap include/linux/fs.h:2025 [inline]
 mmap_region+0xef2/0x2240 mm/mmap.c:2851
 do_mmap+0x8d3/0xfa0 mm/mmap.c:1379
 vm_mmap_pgoff+0x1dc/0x410 mm/util.c:546
 ksys_mmap_pgoff+0x4ff/0x6d0 mm/mmap.c:1425
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f6cf1c7cae9
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:00007f6cf0ffe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f6cf1d9bf80 RCX: 00007f6cf1c7cae9
RDX: 0000000001000002 RSI: 0000000000400000 RDI: 0000000020000000
RBP: 00007f6cf0ffe120 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000011012 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f6cf1d9bf80 R15: 00007ffc98ff0338
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__page_table_check_zero+0x2d5/0x4a0 mm/page_table_check.c:146
Code: 98 ff 48 ff cb e9 b5 fd ff ff e8 e6 9f 98 ff 48 ff cb e9 27 fe ff ff e8 d9 9f 98 ff 0f 0b e8 d2 9f 98 ff 0f 0b e8 cb 9f 98 ff <0f> 0b f3 0f 1e fa 4c 89 f6 48 81 e6 ff 0f 00 00 31 ff e8 f4 a3 98
RSP: 0018:ffffc900049f7800 EFLAGS: 00010293
RAX: ffffffff81f620c5 RBX: dffffc0000000000 RCX: ffff8880263f1dc0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880160ea044
RBP: ffff8880160ea044 R08: ffff8880160ea047 R09: 1ffff11002c1d408
R10: dffffc0000000000 R11: ffffed1002c1d409 R12: 0000000000000000
R13: 1ffffffff243299c R14: 000000000000000a R15: ffff8880160ea000
FS:  00007f6cf0ffe6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f9eb7b1680 CR3: 000000001d34c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         89cdf9d5 Merge tag 'net-6.7-rc1' of git://git.kernel.o..
git tree:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=107ab1c0e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=97c84b399d02b00b
dashboard link: https://syzkaller.appspot.com/bug?extid=7a9bbb158a7a1071eb27
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17f7a747680000