linux-kernel - Re: [syzbot] [mm?] WARNING in __page_table_check_ptes

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Message-ID: <66f93c6c.050a0220.6bad9.000c.GAE@google.com>
Date: Sun, 29 Sep 2024 04:39:24 -0700
From: syzbot <syzbot+0b56d6ed0d0c0c9a79dc@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, pasha.tatashin@...een.com, peterx@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] WARNING in __page_table_check_ptes_set (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    3efc57369a0c Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=177e0127980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4fcb065287cdb84
dashboard link: https://syzkaller.appspot.com/bug?extid=0b56d6ed0d0c0c9a79dc
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17a7de80580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16b67507980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b5a4faec7a99/disk-3efc5736.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/971adf9a5295/vmlinux-3efc5736.xz
kernel image: https://storage.googleapis.com/syzbot-assets/49516da34e16/bzImage-3efc5736.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0b56d6ed0d0c0c9a79dc@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5229 at mm/page_table_check.c:209 page_table_check_pte_flags mm/page_table_check.c:209 [inline]
WARNING: CPU: 1 PID: 5229 at mm/page_table_check.c:209 __page_table_check_ptes_set+0x3bf/0x410 mm/page_table_check.c:220
Modules linked in:
CPU: 1 UID: 0 PID: 5229 Comm: syz-executor342 Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:page_table_check_pte_flags mm/page_table_check.c:209 [inline]
RIP: 0010:__page_table_check_ptes_set+0x3bf/0x410 mm/page_table_check.c:220
Code: 00 6c 49 39 c4 74 1d 48 b8 00 00 00 00 00 00 00 68 49 39 c4 75 1c e8 60 6b 89 ff eb 0c e8 59 6b 89 ff eb 05 e8 52 6b 89 ff 90 <0f> 0b 90 e9 98 fd ff ff e8 44 6b 89 ff e9 8e fd ff ff e8 da b9 b9
RSP: 0018:ffffc90002fe7000 EFLAGS: 00010293
RAX: ffffffff820b7ac0 RBX: d7ffe7fff1ed7c06 RCX: ffff88801cba3c00
RDX: 0000000000000000 RSI: ffffffff8ea73b20 RDI: 6800000000000000
RBP: ffffc90002fe70b0 R08: 0000000000000007 R09: ffffffff820b7a8e
R10: 0000000000000003 R11: ffff88801cba3c00 R12: 6800000000000000
R13: 0000000000000000 R14: 1ffff920005fce04 R15: 0000000000000001
FS:  00005555848eb380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005fdeb8 CR3: 0000000076e54000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
 set_ptes include/linux/pgtable.h:267 [inline]
 try_to_migrate_one+0x2683/0x4240 mm/rmap.c:2300
 rmap_walk_anon+0x4cd/0x8a0 mm/rmap.c:2638
 try_to_migrate+0x3de/0x4b0
 migrate_folio_unmap mm/migrate.c:1326 [inline]
 migrate_pages_batch+0x113d/0x36d0 mm/migrate.c:1797
 migrate_pages_sync mm/migrate.c:1963 [inline]
 migrate_pages+0x2062/0x3560 mm/migrate.c:2072
 migrate_to_node mm/mempolicy.c:1095 [inline]
 do_migrate_pages+0x7ef/0xa30 mm/mempolicy.c:1194
 kernel_migrate_pages mm/mempolicy.c:1709 [inline]
 __do_sys_migrate_pages mm/mempolicy.c:1727 [inline]
 __se_sys_migrate_pages+0x6c4/0x740 mm/mempolicy.c:1723
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd4c1b123e9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc3a5f83d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000100
RAX: ffffffffffffffda RBX: 00007ffc3a5f85b8 RCX: 00007fd4c1b123e9
RDX: 0000000020000040 RSI: 0000000000000003 RDI: 0000000000000000
RBP: 00007fd4c1b85610 R08: 00000000ffffc000 R09: 00000000ffffc000
R10: 0000000020000300 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc3a5f85a8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
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.