handle_softirqs+0x216/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3433! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 15874 Comm: syz.0.2781 Not tainted 6.15.0-syzkaller-02148-g44ed0f35df34 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:filemap_fault+0x185e/0x2730 mm/filemap.c:3433 Code: 00 e9 c3 ec ff ff 48 8b 7c 24 28 e8 ec da 2d 00 e9 6a f3 ff ff e8 92 92 c7 ff 48 c7 c6 40 08 99 8b 48 89 df e8 93 95 10 00 90 <0f> 0b e8 7b 92 c7 ff 48 c7 c6 a0 fe 98 8b 48 89 df e8 7c 95 10 00 RSP: 0018:ffffc900174975b0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: ffffea00015a6180 RCX: ffffc9000ba79000 RDX: 0000000000080000 RSI: ffffffff81f3dd8d RDI: ffff8880273c8444 RBP: ffffc900174977e0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90863857 R11: 1ffffffff1c79aa1 R12: ffff888148ca0878 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f833a97a6c0(0000) GS:ffff888124aa6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001ea6 CR3: 0000000035dd2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_fault+0x10a/0x490 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+0x39fb/0x5450 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 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 e9 14 11 04 00 0f 1f 40 00 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 66 RSP: 0018:ffffc90017497a78 EFLAGS: 00050202 RAX: 0000000000000001 RBX: 0000200000001ea6 RCX: 0000000000000001 RDX: ffffed100ffa917d RSI: 0000200000001ea6 RDI: ffff88807fd48be6 RBP: 0000000000000001 R08: 0000000000000001 R09: ffffed100ffa917c R10: ffff88807fd48be6 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88807fd48be6 R14: dffffc0000000000 R15: 0000200000001ea6 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+0x98/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] snd_rawmidi_kernel_write1+0x50a/0x8a0 sound/core/rawmidi.c:1560 snd_rawmidi_write+0x26e/0xc10 sound/core/rawmidi.c:1629 do_loop_readv_writev fs/read_write.c:850 [inline] do_loop_readv_writev fs/read_write.c:835 [inline] vfs_writev+0x6c4/0xdd0 fs/read_write.c:1059 do_writev+0x28c/0x340 fs/read_write.c:1103 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8339b8e969 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:00007f833a97a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f8339db5fa0 RCX: 00007f8339b8e969 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000006 RBP: 00007f8339c10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8339db5fa0 R15: 00007ffd6822df08 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x185e/0x2730 mm/filemap.c:3433 Code: 00 e9 c3 ec ff ff 48 8b 7c 24 28 e8 ec da 2d 00 e9 6a f3 ff ff e8 92 92 c7 ff 48 c7 c6 40 08 99 8b 48 89 df e8 93 95 10 00 90 <0f> 0b e8 7b 92 c7 ff 48 c7 c6 a0 fe 98 8b 48 89 df e8 7c 95 10 00 RSP: 0018:ffffc900174975b0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: ffffea00015a6180 RCX: ffffc9000ba79000 RDX: 0000000000080000 RSI: ffffffff81f3dd8d RDI: ffff8880273c8444 RBP: ffffc900174977e0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90863857 R11: 1ffffffff1c79aa1 R12: ffff888148ca0878 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f833a97a6c0(0000) GS:ffff888124aa6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001ea6 CR3: 0000000035dd2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 10 e9 adc %ch,%cl 2: 14 11 adc $0x11,%al 4: 04 00 add $0x0,%al 6: 0f 1f 40 00 nopl 0x0(%rax) 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: 66 data16