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Fri, 26 Sep 2025 09:17:53 -0700 (PDT) Date: Fri, 26 Sep 2025 09:17:53 -0700 In-Reply-To: <68d580e5.a00a0220.303701.0019.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d6bcb1.a00a0220.102ee.0006.GAE@google.com> Subject: Forwarded: Re: [syzbot] [overlayfs?] WARNING in ovl_copy_up_file (2) 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] [overlayfs?] WARNING in ovl_copy_up_file (2) Author: ekffu200098@gmail.com #syz test On Fri, Sep 26, 2025 at 2:50=E2=80=AFAM syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: bf40f4b87761 Merge tag 'probes-fixes-v6.17-rc7' of git://= g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1636e14258000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3Dbf99f2510ef92= ba5 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Df754e01116421e9= 754b9 > 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=3D13eb34e2580= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D10ca2f1258000= 0 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d= 900f083ada3/non_bootable_disk-bf40f4b8.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/2fe4635de41e/vmlinu= x-bf40f4b8.xz > kernel image: https://storage.googleapis.com/syzbot-assets/acfb085eaa3e/b= zImage-bf40f4b8.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/1280fcf9f9= a9/mount_0.gz > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+f754e01116421e9754b9@syzkaller.appspotmail.com > > loop0: detected capacity change from 0 to 8 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5501 at fs/overlayfs/copy_up.c:276 ovl_copy_up_file+= 0x640/0x6a0 fs/overlayfs/copy_up.c:276 > Modules linked in: > CPU: 0 UID: 0 PID: 5501 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(f= ull) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.= 16.3-2~bpo12+1 04/01/2014 > RIP: 0010:ovl_copy_up_file+0x640/0x6a0 fs/overlayfs/copy_up.c:276 > Code: e9 2d ff ff ff e8 60 ac 8b fe 49 bc 00 00 00 00 00 fc ff df e9 14 f= f ff ff e8 4c ac 8b fe 90 0f 0b 90 eb 09 e8 41 ac 8b fe 90 <0f> 0b 90 41 bd= fb ff ff ff 48 8b 5c 24 10 e9 8d fb ff ff e8 d8 35 > RSP: 0018:ffffc90002b0f040 EFLAGS: 00010293 > RAX: ffffffff833410ff RBX: ffffc90002b0f0c0 RCX: ffff88801f022440 > RDX: 0000000000000000 RSI: fc0000000000000a RDI: 0000000000000000 > RBP: ffffc90002b0f170 R08: ffffc90002b0f0cf R09: 0000000000000000 > R10: ffffc90002b0f0c0 R11: fffff52000561e1a R12: dffffc0000000000 > R13: fc0000000000000a R14: ffff888033b7d380 R15: ffff888042c0f028 > FS: 0000555584fee500(0000) GS:ffff88808d007000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f2eacb909c0 CR3: 0000000059e0d000 CR4: 0000000000352ef0 > Call Trace: > > ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:885 [inline] > ovl_do_copy_up fs/overlayfs/copy_up.c:999 [inline] > ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] > ovl_copy_up_flags+0x1502/0x2fe0 fs/overlayfs/copy_up.c:1257 > ovl_open+0x138/0x2f0 fs/overlayfs/file.c:211 > do_dentry_open+0x953/0x13f0 fs/open.c:965 > vfs_open+0x3b/0x340 fs/open.c:1095 > do_open fs/namei.c:3887 [inline] > path_openat+0x2ee5/0x3830 fs/namei.c:4046 > do_filp_open+0x1fa/0x410 fs/namei.c:4073 > do_sys_openat2+0x121/0x1c0 fs/open.c:1435 > do_sys_open fs/open.c:1450 [inline] > __do_sys_openat fs/open.c:1466 [inline] > __se_sys_openat fs/open.c:1461 [inline] > __x64_sys_openat+0x138/0x170 fs/open.c:1461 > 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: 0033:0x7f1be718eec9 > 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:00007fff614ed578 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 00007f1be73e5fa0 RCX: 00007f1be718eec9 > RDX: 0000000000000042 RSI: 0000200000000040 RDI: ffffffffffffff9c > RBP: 00007f1be7211f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f1be73e5fa0 R14: 00007f1be73e5fa0 R15: 0000000000000004 > > > > --- > 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. > > 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/68d580e5.a00a0220.303701.0019.GAE%40google.com.