anon_vma_alloc mm/rmap.c:93 [inline] anon_vma_fork+0xde/0x500 mm/rmap.c:359 dup_mmap+0x9e2/0x1b10 mm/mmap.c:1797 dup_mm kernel/fork.c:1489 [inline] copy_mm+0x13c/0x4b0 kernel/fork.c:1541 copy_process+0x1706/0x3c00 kernel/fork.c:2181 kernel_clone+0x21e/0x840 kernel/fork.c:2609 __do_sys_clone kernel/fork.c:2750 [inline] __se_sys_clone kernel/fork.c:2734 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:871! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 6215 Comm: syz.4.71 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870 Code: 14 c8 ff 4c 89 e7 48 c7 c6 60 63 74 8b e8 6b fc 2f ff 90 0f 0b e8 c3 14 c8 ff 4c 89 e7 48 c7 c6 40 5a 74 8b e8 54 fc 2f ff 90 <0f> 0b e8 ac 14 c8 ff 4c 89 e7 48 c7 c6 60 63 74 8b e8 3d fc 2f ff RSP: 0018:ffffc9000b8673a0 EFLAGS: 00010246 RAX: e43b82190c35df00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d70d450 RDI: 00000000ffffffff RBP: ffffc9000b867508 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: ffffea00014ef940 R13: dffffc0000000000 R14: ffffea00014ef948 R15: 0000000000000002 FS: 00007fe181ddb6c0(0000) GS:ffff88812613d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556f713b64b0 CR3: 0000000023d70000 CR4: 0000000000350ef0 Call Trace: filemap_add_folio+0x26d/0x540 mm/filemap.c:978 ra_alloc_folio mm/readahead.c:453 [inline] page_cache_ra_order+0x6bc/0xe70 mm/readahead.c:512 do_sync_mmap_readahead+0x25e/0x7a0 mm/filemap.c:-1 filemap_fault+0x6b9/0x12b0 mm/filemap.c:3489 __do_fault+0x138/0x390 mm/memory.c:5280 do_read_fault mm/memory.c:5698 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6318 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0xb7/0x290 lib/strncpy_from_user.c:130 Code: 00 00 4c 89 f6 e8 a9 c1 fe fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 e4 4c 89 fb <4f> 8b 34 27 48 b8 ff fe fe fe fe fe fe fe 4d 8d 3c 06 4d 89 f5 49 RSP: 0018:ffffc9000b867d10 EFLAGS: 00050246 RAX: ffffffff84c149c7 RBX: 0000200000000140 RCX: ffff8880263bdac0 RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: fffffffffffffff8 R08: ffff8880213764ff R09: 1ffff1100426ec9f R10: dffffc0000000000 R11: ffffed100426eca0 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000fe0 R15: 0000200000000140 getname_flags+0xf3/0x540 fs/namei.c:157 getname include/linux/fs.h:2922 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1431 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe180f8df10 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 69 95 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 bc 95 02 00 8b 44 RSP: 002b:00007fe181ddadf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007fe180f8df10 RDX: 0000000000010000 RSI: 0000200000000140 RDI: 00000000ffffff9c RBP: 0000200000000140 R08: 0000000000000000 R09: 0000000001000809 R10: 0000000000000000 R11: 0000000000000293 R12: 0000200000000140 R13: 00007fe181ddaeb0 R14: 000000000000067a R15: 0000200000000240 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x11ad/0x12f0 mm/filemap.c:870 Code: 14 c8 ff 4c 89 e7 48 c7 c6 60 63 74 8b e8 6b fc 2f ff 90 0f 0b e8 c3 14 c8 ff 4c 89 e7 48 c7 c6 40 5a 74 8b e8 54 fc 2f ff 90 <0f> 0b e8 ac 14 c8 ff 4c 89 e7 48 c7 c6 60 63 74 8b e8 3d fc 2f ff RSP: 0018:ffffc9000b8673a0 EFLAGS: 00010246 RAX: e43b82190c35df00 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffff8d70d450 RDI: 00000000ffffffff RBP: ffffc9000b867508 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: ffffea00014ef940 R13: dffffc0000000000 R14: ffffea00014ef948 R15: 0000000000000002 FS: 00007fe181ddb6c0(0000) GS:ffff88812623d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3b8abb4198 CR3: 0000000023d70000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4c 89 f6 mov %r14,%rsi 5: e8 a9 c1 fe fc call 0xfcfec1b3 a: 49 83 fe 07 cmp $0x7,%r14 e: 0f 86 9d 00 00 00 jbe 0xb1 14: 48 89 1c 24 mov %rbx,(%rsp) 18: 4c 89 74 24 08 mov %r14,0x8(%rsp) 1d: 48 c7 c5 f8 ff ff ff mov $0xfffffffffffffff8,%rbp 24: 45 31 e4 xor %r12d,%r12d 27: 4c 89 fb mov %r15,%rbx * 2a: 4f 8b 34 27 mov (%r15,%r12,1),%r14 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 4d 8d 3c 06 lea (%r14,%rax,1),%r15 3c: 4d 89 f5 mov %r14,%r13 3f: 49 rex.WB