arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/z3fold.c:1293! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 29 Comm: kcompactd1 Not tainted 6.14.0-rc2-syzkaller-00041-g4dc1d1bec898 #0 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+0xc22/0x1170 mm/z3fold.c:1293 Code: ff 48 89 ef 48 c7 c6 60 2b 18 8c e8 c8 65 d8 ff 90 0f 0b e8 70 50 8e ff 48 8b 7c 24 10 48 c7 c6 c0 2b 18 8c e8 af 65 d8 ff 90 <0f> 0b 48 85 db 0f 85 83 00 00 00 0f 1f 44 00 00 e8 49 50 8e ff e9 RSP: 0018:ffffc90000506eb8 EFLAGS: 00010246 RAX: d794f9eee265bb00 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001 RBP: ffffea0001053400 R08: ffffffff901b6077 R09: 1ffffffff2036c0e R10: dffffc0000000000 R11: fffffbfff2036c0f R12: dffffc0000000000 R13: ffffffff8c1829c8 R14: 04fff00000010001 R15: 1ffffd400020a680 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa856600000 CR3: 00000000517ac000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: move_to_new_folio+0x9a5/0xc20 mm/migrate.c:1071 migrate_folio_move mm/migrate.c:1360 [inline] migrate_folios_move mm/migrate.c:1712 [inline] migrate_pages_batch+0x1e84/0x30b0 mm/migrate.c:1959 migrate_pages_sync mm/migrate.c:2016 [inline] migrate_pages+0x2561/0x34a0 mm/migrate.c:2098 compact_zone+0x33d5/0x4ae0 mm/compaction.c:2663 kcompactd_do_work mm/compaction.c:3111 [inline] kcompactd+0x8d1/0x14b0 mm/compaction.c:3204 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:z3fold_page_migrate+0xc22/0x1170 mm/z3fold.c:1293 Code: ff 48 89 ef 48 c7 c6 60 2b 18 8c e8 c8 65 d8 ff 90 0f 0b e8 70 50 8e ff 48 8b 7c 24 10 48 c7 c6 c0 2b 18 8c e8 af 65 d8 ff 90 <0f> 0b 48 85 db 0f 85 83 00 00 00 0f 1f 44 00 00 e8 49 50 8e ff e9 RSP: 0018:ffffc90000506eb8 EFLAGS: 00010246 RAX: d794f9eee265bb00 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001 RBP: ffffea0001053400 R08: ffffffff901b6077 R09: 1ffffffff2036c0e R10: dffffc0000000000 R11: fffffbfff2036c0f R12: dffffc0000000000 R13: ffffffff8c1829c8 R14: 04fff00000010001 R15: 1ffffd400020a680 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8569ff000 CR3: 00000000122e2000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400