smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:859! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 3 UID: 0 PID: 11724 Comm: syz.4.1557 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__filemap_add_folio+0xfa4/0x1260 mm/filemap.c:859 Code: 51 c1 ff 48 c7 c6 20 92 bd 8b 4c 89 ef e8 c4 bb 12 00 90 0f 0b e8 3c 51 c1 ff 48 c7 c6 80 92 bd 8b 4c 89 ef e8 ad bb 12 00 90 <0f> 0b e8 25 51 c1 ff 90 0f 0b 90 e9 76 fe ff ff e8 17 51 c1 ff 90 RSP: 0018:ffffc90004d674a8 EFLAGS: 00010287 RAX: 000000000002ac42 RBX: 0000000000112cc0 RCX: ffffc90025291000 RDX: 0000000000080000 RSI: ffffffff825adb68 RDI: ffff888038c9aa04 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff21b3292 R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000002 R13: ffffea00017a6cc0 R14: 0000000000000000 R15: 1ffff920009acebf FS: 00007f09d7de96c0(0000) GS:ffff8880d6632000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000046ff6000 CR4: 0000000000352ef0 Call Trace: filemap_add_folio+0x1d8/0x690 mm/filemap.c:967 ra_alloc_folio mm/readahead.c:456 [inline] page_cache_ra_order+0x614/0xef0 mm/readahead.c:515 do_sync_mmap_readahead mm/filemap.c:3417 [inline] filemap_fault+0x18ef/0x2e80 mm/filemap.c:3566 __do_fault+0x10b/0x440 mm/memory.c:5474 do_shared_fault mm/memory.c:5973 [inline] do_fault+0x2db/0x1750 mm/memory.c:6047 do_pte_missing mm/memory.c:4566 [inline] handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault+0x187d/0x2a00 mm/memory.c:6565 handle_mm_fault+0x37b/0xa30 mm/memory.c:6734 do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] RIP: 0010:_inline_copy_to_user include/linux/uaccess.h:206 [inline] RIP: 0010:_copy_to_user+0x9f/0xd0 lib/usercopy.c:26 Code: 89 ee 48 89 ef e8 21 32 0c fd 4d 85 ff 75 26 e8 f7 37 0c fd 89 de 4c 89 e7 e8 5d 5b 7c fd 0f 01 cb 48 89 d9 48 89 ef 4c 89 e6 a4 0f 1f 00 0f 01 ca 48 89 cb e8 d1 37 0c fd 48 89 d8 5b 5d 41 RSP: 0018:ffffc90004d67c78 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 000000000000000e RCX: 000000000000000e RDX: 0000000000000001 RSI: ffff88802cb09c00 RDI: 0000200000000280 RBP: 0000200000000280 R08: 0000000000000000 R09: ffffed1005961381 R10: ffff88802cb09c0d R11: 0000000000000000 R12: ffff88802cb09c00 R13: 000020000000028e R14: 00007ffffffff000 R15: 0000000000000000 copy_to_user include/linux/uaccess.h:236 [inline] snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1539 [inline] snd_pcm_oss_read+0x2bd/0x730 sound/core/oss/pcm_oss.c:2788 vfs_read+0x1e4/0xb40 fs/read_write.c:572 ksys_read+0x12a/0x250 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f09d6f9ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f09d7de9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f09d7215fa0 RCX: 00007f09d6f9ce59 RDX: 000000000000004f RSI: 0000200000000280 RDI: 0000000000000007 RBP: 00007f09d7032e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f09d7216038 R14: 00007f09d7215fa0 R15: 00007ffface2a5c8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0xfa4/0x1260 mm/filemap.c:859 Code: 51 c1 ff 48 c7 c6 20 92 bd 8b 4c 89 ef e8 c4 bb 12 00 90 0f 0b e8 3c 51 c1 ff 48 c7 c6 80 92 bd 8b 4c 89 ef e8 ad bb 12 00 90 <0f> 0b e8 25 51 c1 ff 90 0f 0b 90 e9 76 fe ff ff e8 17 51 c1 ff 90 RSP: 0018:ffffc90004d674a8 EFLAGS: 00010287 RAX: 000000000002ac42 RBX: 0000000000112cc0 RCX: ffffc90025291000 RDX: 0000000000080000 RSI: ffffffff825adb68 RDI: ffff888038c9aa04 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff21b3292 R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000002 R13: ffffea00017a6cc0 R14: 0000000000000000 R15: 1ffff920009acebf FS: 00007f09d7de96c0(0000) GS:ffff8880d6632000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557df56b8cf8 CR3: 0000000046ff6000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 89 ee mov %ebp,%esi 2: 48 89 ef mov %rbp,%rdi 5: e8 21 32 0c fd call 0xfd0c322b a: 4d 85 ff test %r15,%r15 d: 75 26 jne 0x35 f: e8 f7 37 0c fd call 0xfd0c380b 14: 89 de mov %ebx,%esi 16: 4c 89 e7 mov %r12,%rdi 19: e8 5d 5b 7c fd call 0xfd7c5b7b 1e: 0f 01 cb stac 21: 48 89 d9 mov %rbx,%rcx 24: 48 89 ef mov %rbp,%rdi 27: 4c 89 e6 mov %r12,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 0f 01 ca clac 32: 48 89 cb mov %rcx,%rbx 35: e8 d1 37 0c fd call 0xfd0c380b 3a: 48 89 d8 mov %rbx,%rax 3d: 5b pop %rbx 3e: 5d pop %rbp 3f: 41 rex.B