kswapd_shrink_node mm/vmscan.c:6807 [inline] balance_pgdat+0xbab/0x19c0 mm/vmscan.c:6999 kswapd+0x590/0xb70 mm/vmscan.c:7264 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: 2 UID: 0 PID: 6477 Comm: syz.2.8961 Not tainted 6.14.0-rc7-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: 26 93 ff 48 c7 c6 c0 fe 7d 8b 48 89 ef e8 11 a5 d9 ff 90 0f 0b e8 39 26 93 ff 48 c7 c6 20 ff 7d 8b 48 89 ef e8 fa a4 d9 ff 90 <0f> 0b e8 22 26 93 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc900041d6668 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9002dd3e000 RDX: 0000000000080000 RSI: ffffffff8226cb96 RDI: ffff8880606b8444 RBP: ffffea0001664380 R08: 0000000000000001 R09: fffffbfff2dd839f R10: ffffffff96ec1cff R11: 0000000000000004 R12: ffffea0001a8fc40 R13: ffffea00016643a8 R14: 0000000000000001 R15: ffffea0001664398 FS: 0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:00000000f5034b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f4702f2c020 CR3: 000000004e934000 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_mpol+0x1fc/0x540 mm/mempolicy.c:2270 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2289 vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2324 vma_alloc_anon_folio_pmd+0x37/0x290 mm/huge_memory.c:1165 do_huge_zero_wp_pmd mm/huge_memory.c:1815 [inline] do_huge_pmd_wp_page+0xb3e/0x2560 mm/huge_memory.c:1852 wp_huge_pmd mm/memory.c:5773 [inline] __handle_mm_fault+0x1a71/0x2a40 mm/memory.c:6021 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6200 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] RIP: 0010:copy_to_user_iter lib/iov_iter.c:25 [inline] RIP: 0010:iterate_iovec include/linux/iov_iter.h:52 [inline] RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:302 [inline] RIP: 0010:iterate_and_advance include/linux/iov_iter.h:328 [inline] RIP: 0010:_copy_to_iter+0x4e8/0x1560 lib/iov_iter.c:185 Code: 45 e8 ec c5 f8 fc 48 8b 4c 24 18 89 ee 48 8b 44 24 28 4c 8d 34 01 4c 89 f7 e8 d4 04 5b fd 0f 01 cb 48 89 e9 4c 89 ff 4c 89 f6 a4 0f 1f 00 0f 01 ca 48 89 e8 48 29 eb 48 29 c8 48 01 cb 48 01 RSP: 0018:ffffc900041d7948 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000e80 RDX: 0000000000000000 RSI: ffff88806da08180 RDI: 0000000080200000 RBP: 0000000000001000 R08: 0000000000000000 R09: ffffed100db411ff R10: ffff88806da08fff R11: 0000000000000000 R12: 00000000001ffb80 R13: ffffc900041d7d40 R14: ffff88806da08000 R15: 00000000801ffe80 copy_page_to_iter lib/iov_iter.c:362 [inline] copy_page_to_iter+0xf1/0x180 lib/iov_iter.c:349 process_vm_rw_pages mm/process_vm_access.c:45 [inline] process_vm_rw_single_vec mm/process_vm_access.c:118 [inline] process_vm_rw_core.constprop.0+0x5bb/0x9c0 mm/process_vm_access.c:216 process_vm_rw+0x301/0x360 mm/process_vm_access.c:284 __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline] __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline] __ia32_sys_process_vm_readv+0xdf/0x1b0 mm/process_vm_access.c:292 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: 0023:0xf7f53579 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:00000000f503455c EFLAGS: 00000296 ORIG_RAX: 000000000000015b RAX: ffffffffffffffda RBX: 00000000000000b5 RCX: 0000000080008400 RDX: 0000000000000002 RSI: 0000000080008640 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 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: 26 93 ff 48 c7 c6 c0 fe 7d 8b 48 89 ef e8 11 a5 d9 ff 90 0f 0b e8 39 26 93 ff 48 c7 c6 20 ff 7d 8b 48 89 ef e8 fa a4 d9 ff 90 <0f> 0b e8 22 26 93 ff 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc900041d6668 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9002dd3e000 RDX: 0000000000080000 RSI: ffffffff8226cb96 RDI: ffff8880606b8444 RBP: ffffea0001664380 R08: 0000000000000001 R09: fffffbfff2dd839f R10: ffffffff96ec1cff R11: 0000000000000004 R12: ffffea0001a8fc40 R13: ffffea00016643a8 R14: 0000000000000001 R15: ffffea0001664398 FS: 0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:00000000f5034b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000578804ac CR3: 000000004e934000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 45 e8 ec c5 f8 fc rex.RB call 0xfcf8c5f2 6: 48 8b 4c 24 18 mov 0x18(%rsp),%rcx b: 89 ee mov %ebp,%esi d: 48 8b 44 24 28 mov 0x28(%rsp),%rax 12: 4c 8d 34 01 lea (%rcx,%rax,1),%r14 16: 4c 89 f7 mov %r14,%rdi 19: e8 d4 04 5b fd call 0xfd5b04f2 1e: 0f 01 cb stac 21: 48 89 e9 mov %rbp,%rcx 24: 4c 89 ff mov %r15,%rdi 27: 4c 89 f6 mov %r14,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 0f 01 ca clac 32: 48 89 e8 mov %rbp,%rax 35: 48 29 eb sub %rbp,%rbx 38: 48 29 c8 sub %rcx,%rax 3b: 48 01 cb add %rcx,%rbx 3e: 48 rex.W 3f: 01 .byte 0x1