process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 ------------[ cut here ]------------ kernel BUG at mm/z3fold.c:1293! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 UID: 0 PID: 22306 Comm: syz.1.5655 Not tainted 6.14.0-rc6-syzkaller #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+0xc37/0x12d0 mm/z3fold.c:1293 Code: 1a 93 ff 48 c7 c6 00 fe 7d 8b 48 89 ef e8 a1 a2 d9 ff 90 0f 0b e8 69 1a 93 ff 48 c7 c6 60 fe 7d 8b 48 89 ef e8 8a a2 d9 ff 90 <0f> 0b e8 52 1a 93 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90002baead8 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9002c2d3000 RDX: 0000000000080000 RSI: ffffffff8226d5e6 RDI: ffff888025b44cc4 RBP: ffffea0001d55440 R08: 0000000000000001 R09: fffffbfff2dd7fc0 R10: ffffffff96ebfe07 R11: 0000000000000006 R12: ffffea0001e6d700 R13: ffffea0001d55468 R14: 0000000000000001 R15: ffffea0001d55458 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:00000000f5036b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000ffacbfe8 CR3: 00000000217d6000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: move_to_new_folio+0x449/0x700 mm/migrate.c:1071 migrate_folio_move mm/migrate.c:1360 [inline] migrate_folios_move mm/migrate.c:1712 [inline] migrate_pages_batch+0x2009/0x3150 mm/migrate.c:1959 migrate_pages_sync+0x4f1/0x910 mm/migrate.c:2016 migrate_pages+0x1acf/0x2290 mm/migrate.c:2098 compact_zone+0x1f66/0x4220 mm/compaction.c:2663 compact_zone_order+0x16b/0x240 mm/compaction.c:2798 try_to_compact_pages+0x357/0xa80 mm/compaction.c:2859 __alloc_pages_direct_compact+0x138/0x590 mm/page_alloc.c:3685 __alloc_pages_slowpath mm/page_alloc.c:4389 [inline] __alloc_frozen_pages_noprof+0xbe5/0x2470 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_buddy_hugetlb_folio.isra.0+0xbe/0x330 mm/hugetlb.c:1955 alloc_fresh_hugetlb_folio+0x14b/0x190 mm/hugetlb.c:2026 alloc_surplus_hugetlb_folio+0x12b/0x300 mm/hugetlb.c:2244 alloc_buddy_hugetlb_folio_with_mpol mm/hugetlb.c:2319 [inline] alloc_hugetlb_folio+0xce8/0x1390 mm/hugetlb.c:3058 hugetlb_no_page mm/hugetlb.c:6172 [inline] hugetlb_fault+0x1f5c/0x2fa0 mm/hugetlb.c:6413 handle_mm_fault+0x930/0xaa0 mm/memory.c:6217 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x773/0x36f0 mm/gup.c:1491 populate_vma_page_range+0x27f/0x3a0 mm/gup.c:1929 __mm_populate+0x1d6/0x380 mm/gup.c:2032 mm_populate include/linux/mm.h:3386 [inline] vm_mmap_pgoff+0x2d3/0x3a0 mm/util.c:580 ksys_mmap_pgoff+0x1c8/0x5c0 mm/mmap.c:607 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f17579 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:00000000f503655c EFLAGS: 00000296 ORIG_RAX: 00000000000000c0 RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000000ff5000 RDX: 0000000000000002 RSI: 000000000004c831 RDI: 00000000ffffffff RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:z3fold_page_migrate+0xc37/0x12d0 mm/z3fold.c:1293 Code: 1a 93 ff 48 c7 c6 00 fe 7d 8b 48 89 ef e8 a1 a2 d9 ff 90 0f 0b e8 69 1a 93 ff 48 c7 c6 60 fe 7d 8b 48 89 ef e8 8a a2 d9 ff 90 <0f> 0b e8 52 1a 93 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90002baead8 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9002c2d3000 RDX: 0000000000080000 RSI: ffffffff8226d5e6 RDI: ffff888025b44cc4 RBP: ffffea0001d55440 R08: 0000000000000001 R09: fffffbfff2dd7fc0 R10: ffffffff96ebfe07 R11: 0000000000000006 R12: ffffea0001e6d700 R13: ffffea0001d55468 R14: 0000000000000001 R15: ffffea0001d55458 FS: 0000000000000000(0000) GS:ffff88802b500000(0063) knlGS:00000000f5036b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000ffacbfe8 CR3: 00000000217d6000 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