BUG: unable to handle page fault for address: ffffc9000ffbd3e8
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1b400067 P4D 1b400067 PUD 1c2ff067 PMD 69c10067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 15967 Comm: syz.8.1896 Not tainted 6.15.0-rc4-syzkaller-00256-g95d3481af6dc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:memset_orig+0x46/0xb0 arch/x86/lib/memset_64.S:73
Code: 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 <48> 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00
RSP: 0018:ffffc90001557a60 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000005930
RDX: 0000000000200000 RSI: 0000000000000000 RDI: ffffc9000ffbd3c0
RBP: 0000000000200000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000ff22000 R11: 0000000000000000 R12: 0000000000100000
R13: ffffc9000ff22000 R14: ffffffff8cb36e3c R15: 000000000000001c
FS:  00007f44102b96c0(0000) GS:ffff888124aec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000ffbd3e8 CR3: 00000000284ac000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 snd_pcm_format_set_silence+0x211/0x340 sound/core/pcm_misc.c:441
 snd_pcm_oss_change_params_locked+0x1eb4/0x3b40 sound/core/oss/pcm_oss.c:1078
 snd_pcm_oss_make_ready_locked+0xb7/0x130 sound/core/oss/pcm_oss.c:1187
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1515 [inline]
 snd_pcm_oss_read+0x39b/0x760 sound/core/oss/pcm_oss.c:2773
 vfs_read+0x1de/0xc70 fs/read_write.c:568
 ksys_read+0x12a/0x240 fs/read_write.c:713
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f440f38e969
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:00007f44102b9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f440f5b6080 RCX: 00007f440f38e969
RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f440f410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f440f5b6080 R15: 00007ffe3b9d6d48
 </TASK>
Modules linked in:
CR2: ffffc9000ffbd3e8
---[ end trace 0000000000000000 ]---
RIP: 0010:memset_orig+0x46/0xb0 arch/x86/lib/memset_64.S:73
Code: 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 <48> 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00
RSP: 0018:ffffc90001557a60 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000005930
RDX: 0000000000200000 RSI: 0000000000000000 RDI: ffffc9000ffbd3c0
RBP: 0000000000200000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000ff22000 R11: 0000000000000000 R12: 0000000000100000
R13: ffffc9000ff22000 R14: ffffffff8cb36e3c R15: 000000000000001c
FS:  00007f44102b96c0(0000) GS:ffff888124aec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000ffbd3e8 CR3: 00000000284ac000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	75 74                	jne    0x76
   2:	48 89 d1             	mov    %rdx,%rcx
   5:	48 c1 e9 06          	shr    $0x6,%rcx
   9:	74 39                	je     0x44
   b:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  12:	00 00
  14:	48 ff c9             	dec    %rcx
  17:	48 89 07             	mov    %rax,(%rdi)
  1a:	48 89 47 08          	mov    %rax,0x8(%rdi)
  1e:	48 89 47 10          	mov    %rax,0x10(%rdi)
  22:	48 89 47 18          	mov    %rax,0x18(%rdi)
  26:	48 89 47 20          	mov    %rax,0x20(%rdi)
* 2a:	48 89 47 28          	mov    %rax,0x28(%rdi) <-- trapping instruction
  2e:	48 89 47 30          	mov    %rax,0x30(%rdi)
  32:	48 89 47 38          	mov    %rax,0x38(%rdi)
  36:	48 8d 7f 40          	lea    0x40(%rdi),%rdi
  3a:	75 d8                	jne    0x14
  3c:	0f                   	.byte 0xf
  3d:	1f                   	(bad)
  3e:	84 00                	test   %al,(%rax)