kernel_clone+0x176/0x9d0 kernel/fork.c:2769 __do_sys_clone+0xd9/0x120 kernel/fork.c:2911 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:858! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 3 UID: 0 PID: 14412 Comm: syz.3.3162 Not tainted syzkaller #0 PREEMPT(full) 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+0x108b/0x1370 mm/filemap.c:858 Code: 5a bf ff 48 c7 c6 00 d3 fe 8b 4c 89 ef e8 3d fc 12 00 90 0f 0b e8 a5 5a bf ff 48 c7 c6 60 d3 fe 8b 4c 89 ef e8 26 fc 12 00 90 <0f> 0b e8 8e 5a bf ff 48 c7 c6 e0 d3 fe 8b 4c 89 ef e8 0f fc 12 00 RSP: 0018:ffffc9000c4a73a0 EFLAGS: 00010283 RAX: 000000000002906d RBX: 0000000000000000 RCX: ffffc90006fdc000 RDX: 0000000000080000 RSI: ffffffff825fbf28 RDI: ffff88802d1baa44 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000002 R13: ffffea0000f46a80 R14: 0000000000000000 R15: 1ffff92001894ea0 FS: 00007f59376f46c0(0000) GS:ffff8880d5e59000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000002ba0a000 CR4: 0000000000352ef0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: filemap_add_folio+0x1d8/0x6a0 mm/filemap.c:972 ra_alloc_folio mm/readahead.c:470 [inline] page_cache_ra_order+0x602/0xed0 mm/readahead.c:535 do_sync_mmap_readahead mm/filemap.c:3443 [inline] filemap_fault+0x1943/0x3130 mm/filemap.c:3597 __do_fault+0x10b/0x440 mm/memory.c:5565 do_read_fault mm/memory.c:6000 [inline] do_fault+0xb3f/0x1830 mm/memory.c:6134 do_pte_missing mm/memory.c:4700 [inline] handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault+0x150b/0x2f60 mm/memory.c:6707 handle_mm_fault+0x363/0xa20 mm/memory.c:6876 do_user_addr_fault+0x745/0x12f0 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_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] RIP: 0010:_inline_copy_from_user include/linux/uaccess.h:185 [inline] RIP: 0010:_copy_from_user+0x93/0xd0 lib/usercopy.c:18 Code: 7b e1 fc 89 ee 4c 89 ef 48 b8 00 f0 ff ff ff 7f 00 00 48 39 c3 48 0f 47 d8 e8 19 c3 54 fd 0f 01 cb 4c 89 ef 48 89 de 48 89 e9 a4 0f 1f 00 49 89 cc 48 89 cb 0f 01 ca 31 ff 48 89 ce e8 a5 75 RSP: 0018:ffffc9000c4a7bc0 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 0000200000000000 RCX: 0000000000000038 RDX: 0000000000000001 RSI: 0000200000000000 RDI: ffffc9000c4a7cc0 RBP: 0000000000000038 R08: 0000000000000001 R09: fffff52001894f9e R10: ffffc9000c4a7cf7 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9000c4a7cc0 R14: 0000000000000001 R15: 00000000c0386106 copy_from_user include/linux/uaccess.h:222 [inline] cec_receive drivers/media/cec/core/cec-api.c:296 [inline] cec_ioctl+0x282/0x2990 drivers/media/cec/core/cec-api.c:536 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f593679e159 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:00007f59376f4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5936a25fa0 RCX: 00007f593679e159 RDX: 0000200000000000 RSI: 00000000c0386106 RDI: 0000000000000004 RBP: 00007f593683503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5936a26038 R14: 00007f5936a25fa0 R15: 00007fff8e2d0918 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0x108b/0x1370 mm/filemap.c:858 Code: 5a bf ff 48 c7 c6 00 d3 fe 8b 4c 89 ef e8 3d fc 12 00 90 0f 0b e8 a5 5a bf ff 48 c7 c6 60 d3 fe 8b 4c 89 ef e8 26 fc 12 00 90 <0f> 0b e8 8e 5a bf ff 48 c7 c6 e0 d3 fe 8b 4c 89 ef e8 0f fc 12 00 RSP: 0018:ffffc9000c4a73a0 EFLAGS: 00010283 RAX: 000000000002906d RBX: 0000000000000000 RCX: ffffc90006fdc000 RDX: 0000000000080000 RSI: ffffffff825fbf28 RDI: ffff88802d1baa44 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000002 R13: ffffea0000f46a80 R14: 0000000000000000 R15: 1ffff92001894ea0 FS: 00007f59376f46c0(0000) GS:ffff8880d5e59000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000002ba0a000 CR4: 0000000000352ef0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 7b e1 jnp 0xffffffe3 2: fc cld 3: 89 ee mov %ebp,%esi 5: 4c 89 ef mov %r13,%rdi 8: 48 b8 00 f0 ff ff ff movabs $0x7ffffffff000,%rax f: 7f 00 00 12: 48 39 c3 cmp %rax,%rbx 15: 48 0f 47 d8 cmova %rax,%rbx 19: e8 19 c3 54 fd call 0xfd54c337 1e: 0f 01 cb stac 21: 4c 89 ef mov %r13,%rdi 24: 48 89 de mov %rbx,%rsi 27: 48 89 e9 mov %rbp,%rcx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 49 89 cc mov %rcx,%r12 32: 48 89 cb mov %rcx,%rbx 35: 0f 01 ca clac 38: 31 ff xor %edi,%edi 3a: 48 89 ce mov %rcx,%rsi 3d: e8 .byte 0xe8 3e: a5 movsl %ds:(%rsi),%es:(%rdi) 3f: 75 .byte 0x75