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Message-ID: <684ffc59.a00a0220.279073.0037.GAE@google.com> Date: Mon, 16 Jun 2025 04:13:29 -0700 From: syzbot <syzbot+263f159eb37a1c4c67a4@...kaller.appspotmail.com> To: linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, perex@...ex.cz, syzkaller-bugs@...glegroups.com, tiwai@...e.com Subject: [syzbot] [sound?] kernel BUG in filemap_fault (2) Hello, syzbot found the following issue on: HEAD commit: 488ef3560196 KEYS: Invert FINAL_PUT bit git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1503a10c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=162faeb2d1eaefb4 dashboard link: https://syzkaller.appspot.com/bug?extid=263f159eb37a1c4c67a4 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/10b92ce8eca6/disk-488ef356.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4d4223a305b2/vmlinux-488ef356.xz kernel image: https://storage.googleapis.com/syzbot-assets/b4a8f82f3ac9/bzImage-488ef356.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+263f159eb37a1c4c67a4@...kaller.appspotmail.com lookup_one_qstr_excl fs/namei.c:1711 [inline] do_renameat2+0x470/0xc50 fs/namei.c:5234 __do_sys_rename fs/namei.c:5324 [inline] __se_sys_rename fs/namei.c:5322 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3442! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 7049 Comm: syz.2.293 Not tainted 6.16.0-rc1-syzkaller-00005-g488ef3560196 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:filemap_fault+0x117d/0x1200 mm/filemap.c:3442 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 ad 64 29 00 e9 81 fc ff ff e8 23 18 c8 ff 48 89 df 48 c7 c6 20 30 94 8b e8 c4 a7 0d 00 90 <0f> 0b e8 0c 18 c8 ff 48 8b 3c 24 48 c7 c6 a0 36 94 8b e8 ac a7 0d RSP: 0018:ffffc90004b073c0 EFLAGS: 00010246 RAX: f04d382b8d45cd00 RBX: ffffea0001dae580 RCX: f04d382b8d45cd00 RDX: 0000000000000000 RSI: ffffffff8db594ef RDI: ffff888027438000 RBP: ffffc90004b074f8 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa9ec R12: dffffc0000000000 R13: 1ffffd40003b5cb1 R14: ffffea0001dae598 R15: ffffea0001dae588 FS: 00007f5736abb6c0(0000) GS:ffff888125c86000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000069e2 CR3: 0000000028984000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __do_fault+0x135/0x390 mm/memory.c:5189 do_read_fault mm/memory.c:5610 [inline] do_fault mm/memory.c:5744 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault+0x37ed/0x5620 mm/memory.c:6232 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6401 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 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 cc cc cc cc 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 e9 fd f6 03 00 66 2e RSP: 0018:ffffc90004b07978 EFLAGS: 00050202 RAX: 00007ffffffff001 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 00002000000069e2 RDI: ffff8880297ba722 RBP: 00000000000088de R08: ffff8880297ba722 R09: 1ffff110052f74e4 R10: dffffc0000000000 R11: ffffed10052f74e5 R12: 0000000000000000 R13: 0000000000000001 R14: ffff8880297ba722 R15: 00002000000069e2 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+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] snd_rawmidi_kernel_write1+0x3ab/0x650 sound/core/rawmidi.c:1560 snd_rawmidi_write+0x5ad/0xbd0 sound/core/rawmidi.c:1629 do_loop_readv_writev fs/read_write.c:850 [inline] vfs_writev+0x4b3/0x960 fs/read_write.c:1059 do_writev+0x14d/0x2d0 fs/read_write.c:1103 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5735b8e929 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:00007f5736abb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f5735db5fa0 RCX: 00007f5735b8e929 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 000000000000000a RBP: 00007f5735c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5735db5fa0 R15: 00007ffe2d0cdd08 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x117d/0x1200 mm/filemap.c:3442 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 ad 64 29 00 e9 81 fc ff ff e8 23 18 c8 ff 48 89 df 48 c7 c6 20 30 94 8b e8 c4 a7 0d 00 90 <0f> 0b e8 0c 18 c8 ff 48 8b 3c 24 48 c7 c6 a0 36 94 8b e8 ac a7 0d RSP: 0018:ffffc90004b073c0 EFLAGS: 00010246 RAX: f04d382b8d45cd00 RBX: ffffea0001dae580 RCX: f04d382b8d45cd00 RDX: 0000000000000000 RSI: ffffffff8db594ef RDI: ffff888027438000 RBP: ffffc90004b074f8 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa9ec R12: dffffc0000000000 R13: 1ffffd40003b5cb1 R14: ffffea0001dae598 R15: ffffea0001dae588 FS: 00007f5736abb6c0(0000) GS:ffff888125c86000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000069e2 CR3: 0000000028984000 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: cc int3 7: cc int3 8: cc int3 9: cc int3 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: e9 fd f6 03 00 jmp 0x3f73a 3d: 66 data16 3e: 2e cs --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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