Message-ID: <0000000000001dd5e20606a0d265@google.com>
Date:   Sat, 30 Sep 2023 22:20:49 -0700
From:   syzbot <syzbot+dcf3f48f4bfe47a2f80a@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] WARNING in page_vma_mapped_walk

Hello,

syzbot found the following issue on:

HEAD commit:    df964ce9ef9f Add linux-next specific files for 20230929
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17fed5e1680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=880c828d75e38e1b
dashboard link: https://syzkaller.appspot.com/bug?extid=dcf3f48f4bfe47a2f80a
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fe7244c6057d/disk-df964ce9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/48cdc7f3b2c0/vmlinux-df964ce9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ce7c93a66da9/bzImage-df964ce9.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dcf3f48f4bfe47a2f80a@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 8436 at include/linux/hugetlb.h:1289 hugetlb_walk include/linux/hugetlb.h:1289 [inline]
WARNING: CPU: 1 PID: 8436 at include/linux/hugetlb.h:1289 page_vma_mapped_walk+0x1e85/0x27a0 mm/page_vma_mapped.c:199
Modules linked in:
CPU: 1 PID: 8436 Comm: syz-executor.0 Not tainted 6.6.0-rc3-next-20230929-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:hugetlb_walk include/linux/hugetlb.h:1289 [inline]
RIP: 0010:page_vma_mapped_walk+0x1e85/0x27a0 mm/page_vma_mapped.c:199
Code: 00 be ff ff ff ff 48 81 c7 a0 01 00 00 e8 33 71 77 08 31 ff 89 c5 89 c6 e8 78 b5 b9 ff 85 ed 0f 85 64 f7 ff ff e8 fb b9 b9 ff <0f> 0b e9 58 f7 ff ff e8 ef b9 b9 ff 48 89 ef 48 81 e7 00 f0 ff ff
RSP: 0000:ffffc90004f0f6b8 EFLAGS: 00010283
RAX: 000000000001b5c2 RBX: ffff88801eca2710 RCX: ffffc9000a691000
RDX: 0000000000040000 RSI: ffffffff81ce9bc5 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000002f R12: 0000000000200000
R13: ffffffff92312af8 R14: ffffc90004f0f8c0 R15: ffffffff92312b90
FS:  00007f489c7ce6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31a24000 CR3: 0000000017fc0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 try_to_migrate_one+0x4a2/0x28b0 mm/rmap.c:1929
 rmap_walk_anon+0x225/0x570 mm/rmap.c:2501
 rmap_walk mm/rmap.c:2578 [inline]
 rmap_walk mm/rmap.c:2573 [inline]
 try_to_migrate+0x2b6/0x300 mm/rmap.c:2230
 unmap_and_move_huge_page mm/migrate.c:1421 [inline]
 migrate_hugetlbs mm/migrate.c:1547 [inline]
 migrate_pages+0xa42/0x27c0 mm/migrate.c:1901
 migrate_to_node mm/mempolicy.c:1097 [inline]
 do_migrate_pages+0x2e9/0x670 mm/mempolicy.c:1196
 kernel_migrate_pages+0x59b/0x780 mm/mempolicy.c:1682
 __do_sys_migrate_pages mm/mempolicy.c:1701 [inline]
 __se_sys_migrate_pages mm/mempolicy.c:1697 [inline]
 __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1697
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f489ba7cae9
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:00007f489c7ce0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000100
RAX: ffffffffffffffda RBX: 00007f489bb9c050 RCX: 00007f489ba7cae9
RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: 00007f489bac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f489bb9c050 R15: 00007ffcda957698
 </TASK>


---
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@...glegroups.com.

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 to overwrite 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

Powered by blists - more mailing lists