Hello, syzbot found the following issue on: HEAD commit: 3aaa8ce7a335 Merge tag 'mm-hotfixes-stable-2024-03-07-16-1.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1289abde180000 kernel config: https://syzkaller.appspot.com/x/.config?x=74a95eee532b237a dashboard link: https://syzkaller.appspot.com/bug?extid=ddf4b4c0005944105a9e compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-3aaa8ce7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/84038f5e2c04/vmlinux-3aaa8ce7.xz kernel image: https://storage.googleapis.com/syzbot-assets/dc9d60eea301/bzImage-3aaa8ce7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ddf4b4c0005944105a9e@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 2 PID: 43 at arch/x86/include/asm/pgtable.h:404 pte_uffd_wp arch/x86/include/asm/pgtable.h:404 [inline] WARNING: CPU: 2 PID: 43 at arch/x86/include/asm/pgtable.h:404 try_to_migrate_one+0x19d4/0x36b0 mm/rmap.c:2256 Modules linked in: CPU: 2 PID: 43 Comm: kcompactd0 Not tainted 6.8.0-rc7-syzkaller-00142-g3aaa8ce7a335 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:pte_uffd_wp arch/x86/include/asm/pgtable.h:404 [inline] RIP: 0010:try_to_migrate_one+0x19d4/0x36b0 mm/rmap.c:2256 Code: 89 e7 e8 4f dd 0e 00 e9 16 f8 ff ff e8 d5 47 b4 ff 31 ff 4c 89 ee e8 db 42 b4 ff 4d 85 ed 0f 84 e4 09 00 00 e8 bd 47 b4 ff 90 <0f> 0b 90 e8 b4 47 b4 ff 48 83 cd 04 e9 65 f7 ff ff e8 a6 47 b4 ff RSP: 0018:ffffc9000069f330 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffea0000a02d80 RCX: ffffffff81d79d15 RDX: ffff888018728000 RSI: ffffffff81d79d23 RDI: 0000000000000007 RBP: d7ffe7fffafe9202 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000003 R12: 0000000000000400 R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000800 FS: 0000000000000000(0000) GS:ffff88802c400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00f07b020 CR3: 000000000d378000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> rmap_walk_anon+0x228/0x580 mm/rmap.c:2599 rmap_walk mm/rmap.c:2676 [inline] rmap_walk mm/rmap.c:2671 [inline] try_to_migrate+0x2ba/0x300 mm/rmap.c:2328 migrate_folio_unmap mm/migrate.c:1244 [inline] migrate_pages_batch+0x10c7/0x2c60 mm/migrate.c:1675 migrate_pages_sync mm/migrate.c:1841 [inline] migrate_pages+0x1b31/0x27d0 mm/migrate.c:1950 compact_zone+0x1dcb/0x3f90 mm/compaction.c:2554 proactive_compact_node+0x118/0x1d0 mm/compaction.c:2814 kcompactd+0x712/0xd80 mm/compaction.c:3130 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 </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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
