Hello, syzbot found the following issue on: HEAD commit: 7b7a883c7f4d Add linux-next specific files for 20250213 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=116913f8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5fce2f4fd0c881e1 dashboard link: https://syzkaller.appspot.com/bug?extid=2d18bb4b8a11cab7ab13 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f8fbdf980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156913f8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f96ca702937a/disk-7b7a883c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/901577be06a5/vmlinux-7b7a883c.xz kernel image: https://storage.googleapis.com/syzbot-assets/61175f206a2f/bzImage-7b7a883c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/31908970193f/mount_0.gz The issue was bisected to: commit 22d9d5e93d0eaf7e8662602713b24e9b6171759f Author: NeilBrown <neilb@xxxxxxx> Date: Fri Feb 7 03:36:48 2025 +0000 VFS: add common error checks to lookup_one_qstr_excl() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=114ba1a4580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=134ba1a4580000 console output: https://syzkaller.appspot.com/x/log.txt?x=154ba1a4580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2d18bb4b8a11cab7ab13@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 22d9d5e93d0e ("VFS: add common error checks to lookup_one_qstr_excl()") UDF-fs: error (device loop0): udf_read_tagged: tag checksum failed, block 99: 0x27 != 0x4d UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) UDF-fs: error (device loop0): udf_verify_fi: directory (ino 1376) has entry where CRC length (63772) does not match entry length (28) BUG: unable to handle page fault for address: ffffffffffffff8b #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD e93c067 P4D e93c067 PUD e93e067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 5835 Comm: syz-executor196 Not tainted 6.14.0-rc2-next-20250213-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__d_entry_type include/linux/dcache.h:416 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:421 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:467 [inline] RIP: 0010:lookup_one_qstr_excl+0x162/0x370 fs/namei.c:1696 Code: d3 66 90 48 85 c0 0f 85 58 01 00 00 e8 17 dd 84 ff 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 57 01 00 00 bb 00 00 38 00 <41> 23 1e 44 89 fd 81 e5 00 00 02 00 89 de 09 ee 31 ff e8 27 e1 84 RSP: 0018:ffffc90003f2fcb8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000380000 RCX: ffff888034c01e00 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffff888074918164 R08: ffff88807ab8fe1b R09: 1ffff1100f571fc3 R10: dffffc0000000000 R11: ffffed100f571fc4 R12: ffff88807ab8fd60 R13: dffffc0000000000 R14: ffffffffffffff8b R15: 0000000000060000 FS: 0000555565c15380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffff8b CR3: 00000000776ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> filename_create+0x282/0x480 fs/namei.c:4091 do_mkdirat+0xbd/0x3a0 fs/namei.c:4322 __do_sys_mkdir fs/namei.c:4350 [inline] __se_sys_mkdir fs/namei.c:4348 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4348 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd68a577a57 Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc24c81108 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd68a577a57 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000400000000080 RBP: 0000400000000080 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc24c811a0 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: CR2: ffffffffffffff8b ---[ end trace 0000000000000000 ]--- RIP: 0010:__d_entry_type include/linux/dcache.h:416 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:421 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:467 [inline] RIP: 0010:lookup_one_qstr_excl+0x162/0x370 fs/namei.c:1696 Code: d3 66 90 48 85 c0 0f 85 58 01 00 00 e8 17 dd 84 ff 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 57 01 00 00 bb 00 00 38 00 <41> 23 1e 44 89 fd 81 e5 00 00 02 00 89 de 09 ee 31 ff e8 27 e1 84 RSP: 0018:ffffc90003f2fcb8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000380000 RCX: ffff888034c01e00 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffff888074918164 R08: ffff88807ab8fe1b R09: 1ffff1100f571fc3 R10: dffffc0000000000 R11: ffffed100f571fc4 R12: ffff88807ab8fd60 R13: dffffc0000000000 R14: ffffffffffffff8b R15: 0000000000060000 FS: 0000555565c15380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffff8b CR3: 00000000776ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: d3 66 90 shll %cl,-0x70(%rsi) 3: 48 85 c0 test %rax,%rax 6: 0f 85 58 01 00 00 jne 0x164 c: e8 17 dd 84 ff call 0xff84dd28 11: 4c 89 f0 mov %r14,%rax 14: 48 c1 e8 03 shr $0x3,%rax 18: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax 1d: 84 c0 test %al,%al 1f: 0f 85 57 01 00 00 jne 0x17c 25: bb 00 00 38 00 mov $0x380000,%ebx * 2a: 41 23 1e and (%r14),%ebx <-- trapping instruction 2d: 44 89 fd mov %r15d,%ebp 30: 81 e5 00 00 02 00 and $0x20000,%ebp 36: 89 de mov %ebx,%esi 38: 09 ee or %ebp,%esi 3a: 31 ff xor %edi,%edi 3c: e8 .byte 0xe8 3d: 27 (bad) 3e: e1 84 loope 0xffffffc4 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
