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with SMTP id e9e14a558f8ab-430c52aa249mr372203305ab.25.1761230939221; Thu, 23 Oct 2025 07:48:59 -0700 (PDT) Date: Thu, 23 Oct 2025 07:48:59 -0700 In-Reply-To: <68f9bea1.a70a0220.3bf6c6.0032.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fa405b.a00a0220.9662e.0006.GAE@google.com> Subject: Forwarded: Re: [syzbot] [hfs?] kernel BUG in hfs_new_inode From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [hfs?] kernel BUG in hfs_new_inode Author: ekffu200098@gmail.com #syz test On Thu, Oct 23, 2025 at 2:35=E2=80=AFPM syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 552c50713f27 Merge tag 'vfio-v6.18-rc3' of https://github= ... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1231d73458000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D216353986aa62= c5d > dashboard link: https://syzkaller.appspot.com/bug?extid=3D17cc9bb6d8d69b4= 139f0 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b797= 6-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D10e953e2580= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D176d7c5858000= 0 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/822137407e34/dis= k-552c5071.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/c352dbdc77fe/vmlinu= x-552c5071.xz > kernel image: https://storage.googleapis.com/syzbot-assets/96bd9d9f8c50/b= zImage-552c5071.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/d008a2751b= bd/mount_0.gz > > The issue was bisected to: > > commit a06ec283e125e334155fe13005c76c9f484ce759 > Author: Viacheslav Dubeyko > Date: Tue Jun 10 23:16:09 2025 +0000 > > hfs: add logic of correcting a next unused CNID > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D11b4e3e258= 0000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=3D13b4e3e258= 0000 > console output: https://syzkaller.appspot.com/x/log.txt?x=3D15b4e3e258000= 0 > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+17cc9bb6d8d69b4139f0@syzkaller.appspotmail.com > Fixes: a06ec283e125 ("hfs: add logic of correcting a next unused CNID") > > loop0: detected capacity change from 0 to 64 > hfs: unable to loca[ 123.243188][ T5988] hfs: unable to locate alternate= MDB > hfs: continuing without an alternate MDB > ------------[ cut here ]------------ > kernel BUG at fs/hfs/inode.c:222! > Oops: invalid opcode: 0000 [#1] SMP KASAN PTI > CPU: 1 UID: 0 PID: 5988 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{= RT,(full)} > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 10/02/2025 > RIP: 0010:hfs_new_inode+0xbc4/0xbd0 fs/hfs/inode.c:222 > Code: 89 f1 80 e1 07 fe c1 38 c1 0f 8c 15 fa ff ff 4c 89 f7 e8 0f 6f 8b f= f e9 08 fa ff ff e8 b5 b7 29 ff 90 0f 0b e8 ad b7 29 ff 90 <0f> 0b e8 a5 b7= 29 ff 90 0f 0b 66 90 90 90 90 90 90 90 90 90 90 90 > RSP: 0018:ffffc900040af848 EFLAGS: 00010293 > RAX: ffffffff829555d3 RBX: ffff8880335088c8 RCX: ffff888026d23c00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 > R10: dffffc0000000000 R11: ffffed1005214608 R12: ffff8880290a3000 > R13: 1ffff110073d90f3 R14: 0000000100000000 R15: ffff8880335088c8 > FS: 00007f6c84dde6c0(0000) GS:ffff888126cc2000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2e263fff CR3: 000000003276a000 CR4: 00000000003526f0 > Call Trace: > > hfs_create+0x2a/0xe0 fs/hfs/dir.c:198 > lookup_open fs/namei.c:3796 [inline] > open_last_lookups fs/namei.c:3895 [inline] > path_openat+0x1500/0x3840 fs/namei.c:4131 > do_filp_open+0x1fa/0x410 fs/namei.c:4161 > do_sys_openat2+0x121/0x1c0 fs/open.c:1437 > do_sys_open fs/open.c:1452 [inline] > __do_sys_openat fs/open.c:1468 [inline] > __se_sys_openat fs/open.c:1463 [inline] > __x64_sys_openat+0x138/0x170 fs/open.c:1463 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f6c8576efc9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f= 7 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:00007f6c84dde038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 00007f6c859c5fa0 RCX: 00007f6c8576efc9 > RDX: 0000000000000042 RSI: 00002000000002c0 RDI: ffffffffffffff9c > RBP: 00007f6c857f1f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000058 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f6c859c6038 R14: 00007f6c859c5fa0 R15: 00007fffc4216518 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:hfs_new_inode+0xbc4/0xbd0 fs/hfs/inode.c:222 > Code: 89 f1 80 e1 07 fe c1 38 c1 0f 8c 15 fa ff ff 4c 89 f7 e8 0f 6f 8b f= f e9 08 fa ff ff e8 b5 b7 29 ff 90 0f 0b e8 ad b7 29 ff 90 <0f> 0b e8 a5 b7= 29 ff 90 0f 0b 66 90 90 90 90 90 90 90 90 90 90 90 > RSP: 0018:ffffc900040af848 EFLAGS: 00010293 > RAX: ffffffff829555d3 RBX: ffff8880335088c8 RCX: ffff888026d23c00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 > R10: dffffc0000000000 R11: ffffed1005214608 R12: ffff8880290a3000 > R13: 1ffff110073d90f3 R14: 0000000100000000 R15: ffff8880335088c8 > FS: 00007f6c84dde6c0(0000) GS:ffff888126cc2000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2e263fff CR3: 000000003276a000 CR4: 00000000003526f0 > > > --- > 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@googlegroups.com. > > 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#bisect= ion > > 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 > > -- > You received this message because you are subscribed to the Google Groups= "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an= email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion visit https://groups.google.com/d/msgid/syzkaller= -bugs/68f9bea1.a70a0220.3bf6c6.0032.GAE%40google.com.