__do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 ------------[ cut here ]------------ kernel BUG at mm/z3fold.c:1293! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 8039 Comm: syz.0.553 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #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: a5 92 ff 48 c7 c6 c0 0e 7e 8b 48 89 ef e8 dd 70 d9 ff 90 0f 0b e8 35 a5 92 ff 48 c7 c6 20 0f 7e 8b 48 89 ef e8 c6 70 d9 ff 90 <0f> 0b e8 1e a5 92 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc9000c9aeab0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9000cdd2000 RDX: 0000000000080000 RSI: ffffffff8228506a RDI: ffff88802338ccc4 RBP: ffffea00004dcf00 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90629217 R11: 1ffffffff1c391e9 R12: ffffea0000ad6cc0 R13: ffffea00004dcf28 R14: 0000000000000001 R15: ffffea00004dcf18 FS: 0000000000000000(0000) GS:ffff888097c5a000(0063) knlGS:00000000f5076b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000c421faa CR3: 0000000023082000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 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 compact_zone_order+0x17b/0x250 mm/compaction.c:2798 try_to_compact_pages+0x344/0xa60 mm/compaction.c:2859 __alloc_pages_direct_compact+0x137/0x570 mm/page_alloc.c:3685 __alloc_pages_slowpath mm/page_alloc.c:4389 [inline] __alloc_frozen_pages_noprof+0xbf7/0x24d0 mm/page_alloc.c:4753 __alloc_pages_noprof mm/page_alloc.c:4774 [inline] __folio_alloc_noprof+0x11/0x220 mm/page_alloc.c:4784 alloc_charge_folio+0x2c7/0x990 mm/khugepaged.c:1084 collapse_file+0x1c6/0x3030 mm/khugepaged.c:1854 hpage_collapse_scan_file+0x7ed/0xce0 mm/khugepaged.c:2352 madvise_collapse+0x418/0xb20 mm/khugepaged.c:2794 madvise_vma_behavior+0xbae/0x1de0 mm/madvise.c:1330 madvise_walk_vmas+0x1ce/0x2c0 mm/madvise.c:1511 do_madvise+0x364/0x7c0 mm/madvise.c:1698 __do_sys_madvise mm/madvise.c:1714 [inline] __se_sys_madvise mm/madvise.c:1712 [inline] __ia32_sys_madvise+0xa7/0x110 mm/madvise.c:1712 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f53579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f507655c EFLAGS: 00000296 ORIG_RAX: 00000000000000db RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000000600003 RDX: 0000000000000019 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:z3fold_page_migrate+0xc6b/0x13b0 mm/z3fold.c:1293 Code: a5 92 ff 48 c7 c6 c0 0e 7e 8b 48 89 ef e8 dd 70 d9 ff 90 0f 0b e8 35 a5 92 ff 48 c7 c6 20 0f 7e 8b 48 89 ef e8 c6 70 d9 ff 90 <0f> 0b e8 1e a5 92 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc9000c9aeab0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9000cdd2000 RDX: 0000000000080000 RSI: ffffffff8228506a RDI: ffff88802338ccc4 RBP: ffffea00004dcf00 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90629217 R11: 1ffffffff1c391e9 R12: ffffea0000ad6cc0 R13: ffffea00004dcf28 R14: 0000000000000001 R15: ffffea00004dcf18 FS: 0000000000000000(0000) GS:ffff888097c5a000(0063) knlGS:00000000f5076b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000c421faa CR3: 0000000023082000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi