BUG: unable to handle page fault for address: ffffc9000e4caf40 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1b400067 P4D 1b400067 PUD 1c2fe067 PMD 34d2a067 PTE 0 Oops: Oops: 0002 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 7004 Comm: syz.0.70 Not tainted 6.15.0-rc6-syzkaller-g5723cc3450bc #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:memset_orig+0x33/0xb0 arch/x86/lib/memset_64.S:68 Code: 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 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 RSP: 0018:ffffc90003727b28 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000004382 RDX: 0000000000200000 RSI: 0000000000000000 RDI: ffffc9000e4caf40 RBP: 0000000000200000 R08: 0000000000000001 R09: 0000000000000000 R10: ffffc9000e3d9000 R11: 0000000000000000 R12: 0000000000100000 R13: ffffc9000e3d9000 R14: ffffffff8cb390bc R15: 000000000000001c FS: 00007f7a80df46c0(0000) GS:ffff8881249e7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc9000e4caf40 CR3: 0000000034486000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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_change_params sound/core/oss/pcm_oss.c:1105 [inline] snd_pcm_oss_make_ready+0xe6/0x1b0 sound/core/oss/pcm_oss.c:1164 snd_pcm_oss_sync+0x1de/0x840 sound/core/oss/pcm_oss.c:1730 snd_pcm_oss_release+0x28b/0x310 sound/core/oss/pcm_oss.c:2575 __fput+0x402/0xb70 fs/file_table.c:465 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7a7ff8e969 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:00007f7a80df4038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f7a801b5fa0 RCX: 00007f7a7ff8e969 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000002 RBP: 00007f7a80010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7a801b5fa0 R15: 00007ffc1d6feff8 Modules linked in: CR2: ffffc9000e4caf40 ---[ end trace 0000000000000000 ]--- RIP: 0010:memset_orig+0x33/0xb0 arch/x86/lib/memset_64.S:68 Code: 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 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 RSP: 0018:ffffc90003727b28 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000004382 RDX: 0000000000200000 RSI: 0000000000000000 RDI: ffffc9000e4caf40 RBP: 0000000000200000 R08: 0000000000000001 R09: 0000000000000000 R10: ffffc9000e3d9000 R11: 0000000000000000 R12: 0000000000100000 R13: ffffc9000e3d9000 R14: ffffffff8cb390bc R15: 000000000000001c FS: 00007f7a80df46c0(0000) GS:ffff8881249e7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc9000e4caf40 CR3: 0000000034486000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 01 01 add %eax,(%rcx) 2: 01 01 add %eax,(%rcx) 4: 01 01 add %eax,(%rcx) 6: 01 01 add %eax,(%rcx) 8: 48 0f af c1 imul %rcx,%rax c: 41 89 f9 mov %edi,%r9d f: 41 83 e1 07 and $0x7,%r9d 13: 75 74 jne 0x89 15: 48 89 d1 mov %rdx,%rcx 18: 48 c1 e9 06 shr $0x6,%rcx 1c: 74 39 je 0x57 1e: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 25: 00 00 27: 48 ff c9 dec %rcx * 2a: 48 89 07 mov %rax,(%rdi) <-- trapping instruction 2d: 48 89 47 08 mov %rax,0x8(%rdi) 31: 48 89 47 10 mov %rax,0x10(%rdi) 35: 48 89 47 18 mov %rax,0x18(%rdi) 39: 48 89 47 20 mov %rax,0x20(%rdi) 3d: 48 rex.W 3e: 89 .byte 0x89 3f: 47 rex.RXB