From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f8.google.com (mail-oo2-f8.google.com [74.125.231.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 96DB3496D4D for ; Thu, 10 Sep 2026 20:12:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.136 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789071149; cv=none; b=nBrIfbrgOP3MQ8MQvoIgN2pC+5c9UA2/AHq8zOzbqK+DPv7YDcKQYHou5aJ4OFsJ/ZErChKVtx0mYPOSjJIdxr9/XX2/QismSIV9hZoUltrEc7LskCAH0fp1Bk972/hQBmMhfdE4Ds0JacNdTaeMsn32fgN9R+vA1DY1fa2K/4A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789071149; c=relaxed/simple; bh=e0BXK8n7phBFvVA9KmzzBbWtJNCBZRJ0Sm7uaQAdxfA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Otm8G1R6nanlfKZGZ8cKBQsfIzxt+ye15PqXrPwKBgIFPO8BH9QmBhInqo3sBTiTaLODTSay+uHqc/HmE7hJnVHl8JKTP7t25frizD0O/2HIJl0vlYa7lEOCLpmNv7k6bqihbb7qIYCL0/SufTE20z+I+TDqsZ3AmA0auK/b+Z0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.136 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo2-f8.google.com with SMTP id 006d021491bc7-6b128c3af4bso58262eaf.0 for ; Thu, 10 Sep 2026 13:12:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789071146; x=1789675946; h=content-transfer-encoding:content-type:to:from:subject:message-id :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=B5HmvppgMxkNy1w8k0yZJbD7xSt/louhCSDC60IEkIU=; b=YmZVx7G2b8kQRXLLgi9aVuWPNpgqW6jwlbFRAoN/irvxXnLcfBsjDMNbvI3mPlXa3Q uE/RBCilIY86O4Ldl9xSNR91+/yq+e32fptqfEq2g8ASgh3vrOeYR8dtNbnWAUdgxVLg uc0B6Zgp3sZqgs1GJqBsCKxv5OaHQDlGAO6gH8LDgTelzdl0E2EnbOqqJCJnwY5RY70e hvKG13WIci2q5ztCzDGKi+Xu5E7NFAGDyYAl9TJiJDg2Xru2ETg/875OOtb4/YHoTqc/ m9A/8ty57aZITobRcAdum2RyizYoYkfRbLWhtCFi8xWtFqRuWW3VDdkiCfogCGYpDH+u bQQw== X-Forwarded-Encrypted: i=1; AKwUvBzRsqO0OJYnG9uj2GEc75HX6eHRXUpJFFHOPnlGVRqEjd8XCxA5Kl7F/TwT/8zKiUkMmGE33fUPUKc3/Mg=@vger.kernel.org X-Gm-Message-State: AFuF++lxEZ7uNd/Sp8EssOb7rTIZJ+0EjOuKro+CBc9cVFsG1l6ZJRgG I+vB4AC8zQzBC2Z+ykaQF6ie+jiQRtRIMbSgl+tfq9T5GLFbVyJt0V2rn84bbRM+zPzfZdlQGxw S3/3YLTJsDiZNy1MC6EhHgKrw3jKa2VuYHJgbGs4vDEo3mpqnhiCLmv46egc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:a393:b0:6b7:8396:f3c7 with SMTP id 006d021491bc7-6c0bbce6f26mr372455eaf.41.1789071146454; Thu, 10 Sep 2026 13:12:26 -0700 (PDT) Date: Thu, 10 Sep 2026 13:12:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa30f2a.f81106d8.2ab401.0013.GAE@google.com> Subject: [syzbot] [ceph?] kernel BUG in __open_session From: syzbot To: amarkuze@redhat.com, ceph-devel@vger.kernel.org, idryomov@gmail.com, linux-kernel@vger.kernel.org, slava@dubeyko.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot found the following issue on: HEAD commit: 50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker.= . git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D14ef0905580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D8c5c3949d762a91= f dashboard link: https://syzkaller.appspot.com/bug?extid=3D1dbed5969931c19d3= eb5 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Deb= ian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D13d1fe0158000= 0 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D10cb14d1580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d90= 0f083ada3/non_bootable_disk-50d05c7c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6f77d29903f3/vmlinux-= 50d05c7c.xz kernel image: https://storage.googleapis.com/syzbot-assets/23b2961d9c5d/bzI= mage-50d05c7c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+1dbed5969931c19d3eb5@syzkaller.appspotmail.com libceph: resolve '127.0.0.=03' (ret=3D-3): failed ------------[ cut here ]------------ kernel BUG at net/ceph/mon_client.c:211! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 2 UID: 0 PID: 5924 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16= .3-2 04/01/2014 RIP: 0010:pick_new_mon net/ceph/mon_client.c:211 [inline] RIP: 0010:__open_session+0x60f/0x740 net/ceph/mon_client.c:245 Code: f6 44 89 e7 e8 72 1e 27 fa 89 c5 e9 2b fb ff ff e8 96 4b 7e f6 c7 83 = b4 09 00 00 0a 00 00 00 e9 22 fc ff ff e8 82 4b 7e f6 90 <0f> 0b e8 9a 86 f= 1 f6 e9 7b fa ff ff 4c 89 f7 e8 8d 86 f1 f6 e9 16 RSP: 0018:ffffc900039a7be0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888037864290 RCX: 0000000000000000 RDX: ffff888033b68000 RSI: ffffffff8b8dca8e RDI: ffff888033b68000 RBP: ffff88802a3b4d80 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 00000000ffffffff R14: ffff888037864400 R15: ffff888037864298 FS: 00005555720c7500(0000) GS:ffff8880d5d5a000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e267f24d48 CR3: 0000000036162000 CR4: 0000000000352ef0 Call Trace: ceph_monc_open_session+0x46/0x60 net/ceph/mon_client.c:534 __ceph_open_session+0x135/0x590 net/ceph/ceph_common.c:798 ceph_real_mount fs/ceph/super.c:1173 [inline] ceph_get_tree+0xd98/0x1fd0 fs/ceph/super.c:1362 vfs_get_tree+0x92/0x320 fs/super.c:1947 vfs_cmd_create+0xd7/0x2a0 fs/fsopen.c:231 vfs_fsconfig_locked fs/fsopen.c:295 [inline] __do_sys_fsconfig+0x55a/0xcb0 fs/fsopen.c:463 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: 0033:0x7feb99b9e159 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 f= f 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff76419958 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007feb99e25fa0 RCX: 00007feb99b9e159 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00007feb99c3503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007feb99e25fac R14: 00007feb99e25fa0 R15: 00007feb99e25fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pick_new_mon net/ceph/mon_client.c:211 [inline] RIP: 0010:__open_session+0x60f/0x740 net/ceph/mon_client.c:245 Code: f6 44 89 e7 e8 72 1e 27 fa 89 c5 e9 2b fb ff ff e8 96 4b 7e f6 c7 83 = b4 09 00 00 0a 00 00 00 e9 22 fc ff ff e8 82 4b 7e f6 90 <0f> 0b e8 9a 86 f= 1 f6 e9 7b fa ff ff 4c 89 f7 e8 8d 86 f1 f6 e9 16 RSP: 0018:ffffc900039a7be0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888037864290 RCX: 0000000000000000 RDX: ffff888033b68000 RSI: ffffffff8b8dca8e RDI: ffff888033b68000 RBP: ffff88802a3b4d80 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 00000000ffffffff R14: ffff888037864400 R15: ffff888037864298 FS: 00005555720c7500(0000) GS:ffff8880d5d5a000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e267f24d48 CR3: 0000000036162000 CR4: 0000000000352ef0 --- 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