ext4_page_mkwrite+0x367/0x1760 fs/ext4/inode.c:6164
 do_page_mkwrite+0x177/0x380 mm/memory.c:3256
 do_shared_fault mm/memory.c:5485 [inline]
 do_fault mm/memory.c:5547 [inline]
 do_pte_missing+0x29c/0x3ea0 mm/memory.c:4059
 handle_pte_fault mm/memory.c:5888 [inline]
 __handle_mm_fault+0x1043/0x2a50 mm/memory.c:6031
------------[ cut here ]------------
kernel BUG at mm/z3fold.c:1293!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 45 Comm: kcompactd1 Not tainted 6.14.0-syzkaller-02665-g1e26c5e28ca5 #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:z3fold_page_migrate+0xc6b/0x13b0 mm/z3fold.c:1293
Code: 9b 92 ff 48 c7 c6 00 14 7e 8b 48 89 ef e8 dd 70 d9 ff 90 0f 0b e8 15 9b 92 ff 48 c7 c6 60 14 7e 8b 48 89 ef e8 c6 70 d9 ff 90 <0f> 0b e8 fe 9a 92 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc9000070f410 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888040e84880 RSI: ffffffff8228767a RDI: ffff888040e84cc4
RBP: ffffea0001cd7900 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90627917 R11: 0000000000000000 R12: ffffea0001fb9740
R13: ffffea0001cd7928 R14: 0000000000000001 R15: ffffea0001cd7918
FS:  0000000000000000(0000) GS:ffff888097c5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080000080 CR3: 000000004a8f0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 move_to_new_folio+0x449/0x700 mm/migrate.c:1069
 migrate_folio_move mm/migrate.c:1358 [inline]
 migrate_folios_move mm/migrate.c:1710 [inline]
 migrate_pages_batch+0x201d/0x31a0 mm/migrate.c:1957
 migrate_pages_sync+0x4c5/0x8a0 mm/migrate.c:2014
 migrate_pages+0x1b28/0x2350 mm/migrate.c:2096
 compact_zone+0x1f6d/0x4220 mm/compaction.c:2663
 kcompactd_do_work+0x42e/0x990 mm/compaction.c:3111
 kcompactd+0x406/0xea0 mm/compaction.c:3205
 kthread+0x3a4/0x760 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:z3fold_page_migrate+0xc6b/0x13b0 mm/z3fold.c:1293
Code: 9b 92 ff 48 c7 c6 00 14 7e 8b 48 89 ef e8 dd 70 d9 ff 90 0f 0b e8 15 9b 92 ff 48 c7 c6 60 14 7e 8b 48 89 ef e8 c6 70 d9 ff 90 <0f> 0b e8 fe 9a 92 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc9000070f410 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888040e84880 RSI: ffffffff8228767a RDI: ffff888040e84cc4
RBP: ffffea0001cd7900 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90627917 R11: 0000000000000000 R12: ffffea0001fb9740
R13: ffffea0001cd7928 R14: 0000000000000001 R15: ffffea0001cd7918
FS:  0000000000000000(0000) GS:ffff888097c5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080000080 CR3: 000000004a8f0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400