do_initcall_level+0x104/0x190 init/main.c:1440 do_initcalls+0x59/0xa0 init/main.c:1456 kernel_init_freeable+0x334/0x4b0 init/main.c:1688 kernel_init+0x1d/0x1d0 init/main.c:1578 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3579! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 6052 Comm: syz.2.42 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:filemap_fault+0x1215/0x1290 mm/filemap.c:3579 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 85 00 2d 00 e9 81 fc ff ff e8 db 9d c6 ff 48 89 df 48 c7 c6 80 aa 94 8b e8 3c b0 2c ff 90 <0f> 0b e8 c4 9d c6 ff 48 8b 3c 24 48 c7 c6 00 b1 94 8b e8 24 b0 2c RSP: 0018:ffffc90005266c20 EFLAGS: 00010246 RAX: 7b4b444823884a00 RBX: ffffea00014a6d80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8daa54ce RDI: 00000000ffffffff RBP: ffffc90005266d58 R08: ffffffff8fc3cc77 R09: 1ffffffff1f8798e R10: dffffc0000000000 R11: fffffbfff1f8798f R12: dffffc0000000000 R13: 1ffffd4000294db1 R14: ffffea00014a6d98 R15: ffffea00014a6d88 FS: 00007fe5914ee6c0(0000) GS:ffff888125ae6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000000a CR3: 0000000030962000 CR4: 00000000003526f0 Call Trace: __do_fault+0x138/0x390 mm/memory.c:5320 do_read_fault mm/memory.c:5755 [inline] do_fault mm/memory.c:5889 [inline] do_pte_missing+0x2206/0x3330 mm/memory.c:4401 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580 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:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc90005267258 EFLAGS: 00050206 RAX: 00007ffffffff001 RBX: 0000000000000130 RCX: 0000000000000130 RDX: 0000000000000001 RSI: 0000200000001ac0 RDI: ffffc90005267c10 RBP: ffffc90005267dd0 R08: ffffc90005267d3f R09: 1ffff92000a4cfa7 R10: dffffc0000000000 R11: fffff52000a4cfa8 R12: 1ffff92000a4ce5c R13: ffff8880256f7000 R14: ffffc90005267c10 R15: 0000200000001ac0 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:185 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:223 [inline] lo_ioctl+0x547/0x1c50 drivers/block/loop.c:1540 blkdev_ioctl+0x60e/0x710 block/ioctl.c:791 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe59058f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe5914ee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe5907e6090 RCX: 00007fe59058f749 RDX: 0000200000001ac0 RSI: 0000000000004c0a RDI: 0000000000000006 RBP: 00007fe590613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe5907e6128 R14: 00007fe5907e6090 R15: 00007ffe277d1bc8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x1215/0x1290 mm/filemap.c:3579 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 85 00 2d 00 e9 81 fc ff ff e8 db 9d c6 ff 48 89 df 48 c7 c6 80 aa 94 8b e8 3c b0 2c ff 90 <0f> 0b e8 c4 9d c6 ff 48 8b 3c 24 48 c7 c6 00 b1 94 8b e8 24 b0 2c RSP: 0018:ffffc90005266c20 EFLAGS: 00010246 RAX: 7b4b444823884a00 RBX: ffffea00014a6d80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8daa54ce RDI: 00000000ffffffff RBP: ffffc90005266d58 R08: ffffffff8fc3cc77 R09: 1ffffffff1f8798e R10: dffffc0000000000 R11: fffffbfff1f8798f R12: dffffc0000000000 R13: 1ffffd4000294db1 R14: ffffea00014a6d98 R15: ffffea00014a6d88 FS: 00007fe5914ee6c0(0000) GS:ffff8881259e6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbf5d42eb48 CR3: 0000000030962000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W