do_dentry_open+0xdf0/0x1970 fs/open.c:956 vfs_open+0x3b/0x340 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x2ee5/0x3830 fs/namei.c:4039 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3433! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 15990 Comm: syz.1.3057 Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:filemap_fault+0x1181/0x1200 mm/filemap.c:3433 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 79 64 28 00 e9 81 fc ff ff e8 3f 95 c8 ff 48 89 df 48 c7 c6 40 04 74 8b e8 50 a6 0d 00 90 <0f> 0b e8 28 95 c8 ff 48 8b 3c 24 48 c7 c6 c0 0a 74 8b e8 38 a6 0d RSP: 0018:ffffc9000458f3e0 EFLAGS: 00010246 RAX: 73ba97f5097a5900 RBX: ffffea000174d980 RCX: 73ba97f5097a5900 RDX: 0000000000000000 RSI: ffffffff8d91f812 RDI: ffff88802f13bc00 RBP: ffffc9000458f518 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bba4b4 R12: dffffc0000000000 R13: 1ffffd40002e9b31 R14: ffffea000174d998 R15: ffffea000174d988 FS: 00007f07684d86c0(0000) GS:ffff888126202000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001df4 CR3: 000000007ac0e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_fault+0x135/0x390 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x363e/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0xf/0x90 arch/x86/lib/copy_user_64.S:46 Code: c4 10 c3 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 83 f9 40 73 44 83 f9 08 73 25 85 c9 74 0f <8a> 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 2e RSP: 0018:ffffc9000458f998 EFLAGS: 00050202 RAX: 00007ffffffff001 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000200000001df4 RDI: ffff88804efd6b34 RBP: 000000000000d4cc R08: ffff88804efd6b34 R09: 1ffff11009dfad66 R10: dffffc0000000000 R11: ffffed1009dfad67 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88804efd6b34 R15: 0000200000001df4 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:178 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] snd_rawmidi_kernel_write1+0x3ab/0x650 sound/core/rawmidi.c:1560 snd_rawmidi_write+0x5ad/0xbd0 sound/core/rawmidi.c:1629 do_loop_readv_writev include/linux/uio.h:-1 [inline] vfs_writev+0x4a2/0x9a0 fs/read_write.c:1057 do_writev+0x14d/0x2d0 fs/read_write.c:1101 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f076758e969 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:00007f07684d8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f07677b5fa0 RCX: 00007f076758e969 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000009 RBP: 00007f0767610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f07677b5fa0 R15: 00007ffee4bfdd98 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x1181/0x1200 mm/filemap.c:3433 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 79 64 28 00 e9 81 fc ff ff e8 3f 95 c8 ff 48 89 df 48 c7 c6 40 04 74 8b e8 50 a6 0d 00 90 <0f> 0b e8 28 95 c8 ff 48 8b 3c 24 48 c7 c6 c0 0a 74 8b e8 38 a6 0d RSP: 0018:ffffc9000458f3e0 EFLAGS: 00010246 RAX: 73ba97f5097a5900 RBX: ffffea000174d980 RCX: 73ba97f5097a5900 RDX: 0000000000000000 RSI: ffffffff8d91f812 RDI: ffff88802f13bc00 RBP: ffffc9000458f518 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bba4b4 R12: dffffc0000000000 R13: 1ffffd40002e9b31 R14: ffffea000174d998 R15: ffffea000174d988 FS: 00007f07684d86c0(0000) GS:ffff888126202000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001df4 CR3: 000000007ac0e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 10 c3 adc %al,%bl 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: cc int3 8: cc int3 9: cc int3 a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 48 83 f9 40 cmp $0x40,%rcx 1e: 73 44 jae 0x64 20: 83 f9 08 cmp $0x8,%ecx 23: 73 25 jae 0x4a 25: 85 c9 test %ecx,%ecx 27: 74 0f je 0x38 * 29: 8a 06 mov (%rsi),%al <-- trapping instruction 2b: 88 07 mov %al,(%rdi) 2d: 48 ff c7 inc %rdi 30: 48 ff c6 inc %rsi 33: 48 ff c9 dec %rcx 36: 75 f1 jne 0x29 38: c3 ret 39: cc int3 3a: cc int3 3b: cc int3 3c: cc int3 3d: 66 data16 3e: 2e cs