syzbot

 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 free_unref_folios+0xdfd/0x17e0 mm/page_alloc.c:2737
 folios_put_refs+0x70a/0x800 mm/swap.c:992
 folio_batch_release include/linux/pagevec.h:101 [inline]
 truncate_inode_pages_range+0x462/0x10e0 mm/truncate.c:379
 truncate_bdev_range+0xcb/0x100 block/bdev.c:125
 blkdev_fallocate+0x264/0x490 block/fops.c:857
 vfs_fallocate+0x627/0x7a0 fs/open.c:338
 madvise_remove mm/madvise.c:1034 [inline]
 madvise_vma_behavior mm/madvise.c:1263 [inline]
 madvise_walk_vmas mm/madvise.c:1530 [inline]
 madvise_do_behavior+0x1eda/0x4640 mm/madvise.c:1695
 do_madvise mm/madvise.c:1782 [inline]
 __do_sys_madvise mm/madvise.c:1790 [inline]
 __se_sys_madvise mm/madvise.c:1788 [inline]
 __x64_sys_madvise+0x185/0x220 mm/madvise.c:1788
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
kernel BUG at mm/filemap.c:3432!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5843 Comm: syz-executor394 Not tainted 6.15.0-rc1-syzkaller-00325-g7cdabafc0012 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:filemap_fault+0x1360/0x13d0 mm/filemap.c:3432
Code: c4 ff 48 8b 3c 24 48 c7 c6 80 11 54 8c e8 e8 f9 0e 00 90 0f 0b e8 50 e9 c4 ff 48 89 df 48 c7 c6 00 0b 54 8c e8 d1 f9 0e 00 90 <0f> 0b e8 39 e9 c4 ff 48 8b 3c 24 48 c7 c6 80 11 54 8c e8 b9 f9 0e
RSP: 0018:ffffc90003fbf120 EFLAGS: 00010246
RAX: 63245e9776778400 RBX: ffffea0000d4b380 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e4eaa0b RDI: ffffffff8ca0e120
RBP: ffffc90003fbf258 R08: ffffffff8236b186 R09: fffffbfff1d7a970
R10: dffffc0000000000 R11: fffffbfff1d7a970 R12: ffff888023ab1f78
R13: 1ffffd40001a9671 R14: dffffc0000000000 R15: ffffea0000d4b388
FS:  00007f116eb456c0(0000) GS:ffff888124fc9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001ea5 CR3: 000000003361e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __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+0x3f0c/0x61c0 mm/memory.c:5997
 __handle_mm_fault mm/memory.c:6140 [inline]
 handle_mm_fault+0x1030/0x1aa0 mm/memory.c:6309
 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x2bb/0x920 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 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 2e
RSP: 0018:ffffc90003fbf930 EFLAGS: 00050202
RAX: 00007ffffffff001 RBX: 0000200000001ea5 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000200000001ea5 RDI: ffff88807f7eebe5
RBP: 0000000000000001 R08: ffff88807f7eebe5 R09: 1ffff1100fefdd7c
R10: dffffc0000000000 R11: ffffed100fefdd7d R12: ffff88807f7eebe5
R13: 1ffff11004c93307 R14: ffff88807f7eebe5 R15: 0000000000000001
 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+0x7b/0xb0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:212 [inline]
 snd_rawmidi_kernel_write1+0x390/0x620 sound/core/rawmidi.c:1560
 snd_rawmidi_write+0x5f2/0xc00 sound/core/rawmidi.c:1629
 do_loop_readv_writev fs/read_write.c:848 [inline]
 vfs_writev+0x5ba/0xbc0 fs/read_write.c:1057
 do_writev+0x1b8/0x360 fs/read_write.c:1101
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f116eb8f9b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f116eb45218 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f116ec17328 RCX: 00007f116eb8f9b9
RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000005
RBP: 00007f116ec17320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f116ebe435c
R13: 0000200000000080 R14: 0000200000000000 R15: 6c756e2f7665642f
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filemap_fault+0x1360/0x13d0 mm/filemap.c:3432
Code: c4 ff 48 8b 3c 24 48 c7 c6 80 11 54 8c e8 e8 f9 0e 00 90 0f 0b e8 50 e9 c4 ff 48 89 df 48 c7 c6 00 0b 54 8c e8 d1 f9 0e 00 90 <0f> 0b e8 39 e9 c4 ff 48 8b 3c 24 48 c7 c6 80 11 54 8c e8 b9 f9 0e
RSP: 0018:ffffc90003fbf120 EFLAGS: 00010246
RAX: 63245e9776778400 RBX: ffffea0000d4b380 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e4eaa0b RDI: ffffffff8ca0e120
RBP: ffffc90003fbf258 R08: ffffffff8236b186 R09: fffffbfff1d7a970
R10: dffffc0000000000 R11: fffffbfff1d7a970 R12: ffff888023ab1f78
R13: 1ffffd40001a9671 R14: dffffc0000000000 R15: ffffea0000d4b388
FS:  00007f116eb456c0(0000) GS:ffff888124fc9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001ea5 CR3: 000000003361e000 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:	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:	2e                   	cs