Re: [syzbot] [mm?] WARNING in move_page_tables

[syzbot <syzbot+4d9a13f0797c46a29e42@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in move_page_tables

R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f6b549b6038 R14: 00007f6b549b5fa0 R15: 00007fff55995d28
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 2 PID: 6580 at mm/mremap.c:357 move_normal_pmd mm/mremap.c:357 [inline]
WARNING: CPU: 2 PID: 6580 at mm/mremap.c:357 move_pgt_entry mm/mremap.c:595 [inline]
WARNING: CPU: 2 PID: 6580 at mm/mremap.c:357 move_page_tables+0x3752/0x4580 mm/mremap.c:851
Modules linked in:
CPU: 2 UID: 0 PID: 6580 Comm: syz.0.19 Not tainted 6.17.0-rc1-syzkaller-g8742b2d8935f-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:move_normal_pmd mm/mremap.c:357 [inline]
RIP: 0010:move_pgt_entry mm/mremap.c:595 [inline]
RIP: 0010:move_page_tables+0x3752/0x4580 mm/mremap.c:851
Code: 00 48 8b 04 24 31 ff 0f b6 58 30 89 de e8 f6 1c af ff 84 db 0f 85 0d 01 00 00 e8 09 22 af ff e9 19 d7 ff ff e8 ff 21 af ff 90 <0f> 0b 90 48 8b 44 24 50 48 8d 78 40 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000367f6f8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000343ec007 RCX: ffffffff820c64bc
RDX: ffff8880251d2440 RSI: ffffffff820c6fc1 RDI: 0000000000000007
RBP: ffff888034426700 R08: 0000000000000007 R09: 0000000000000000
R10: 00000000343ec007 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88802a726030 R15: ffffffff8df55480
FS:  00007f6b53df66c0(0000) GS:ffff8880d68bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde7257210 CR3: 000000005332e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 copy_vma_and_data+0x468/0x790 mm/mremap.c:1215
 move_vma+0x548/0x1780 mm/mremap.c:1282
 mremap_to+0x1b7/0x450 mm/mremap.c:1406
 do_mremap+0xfad/0x1f80 mm/mremap.c:1921
 __do_sys_mremap+0x119/0x170 mm/mremap.c:1977
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6b5478ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b53df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007f6b549b5fa0 RCX: 00007f6b5478ebe9
RDX: 0000000000400000 RSI: 0000000000c00000 RDI: 0000200000000000
RBP: 00007f6b53df6090 R08: 0000200000c00000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f6b549b6038 R14: 00007f6b549b5fa0 R15: 00007fff55995d28
 </TASK>


Tested on:

commit:         8742b2d8 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b86842580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f9319a42cfb3bf57
dashboard link: https://syzkaller.appspot.com/bug?extid=4d9a13f0797c46a29e42
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=152825a2580000