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AHgh+Rog/T7wKpfWXwfVgSdzUnpMg9Rd4F7v95cMy4AXOwfDKCywvXNFWwBJyrGE37sBnTi9it/WKmUcwOLk@vger.kernel.org X-Gm-Message-State: AOJu0YzmyotPPWN5SxwpkkaK96xyTRPCZgpRCmlKrA92BWvzgWGEKfWb KM9zB6cagG4ZsemR7WxYwTH0wFMTLMSmnSwtxyYEs2TOcJrcPj9YD6h6h/z9GdVokdd1sO0o5L/ clw1eIFNzgxyhRB0ZW8T10+bEvBwQvPzLmjZNc5aw7lbbtrB4V2MVOvzEHg8= Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:19a8:b0:490:17f1:ac3b with SMTP id 5614622812f47-4ae31a41dcdmr830283b6e.18.1785481768223; Fri, 31 Jul 2026 00:09:28 -0700 (PDT) Date: Fri, 31 Jul 2026 00:09:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6c4a28.77639fcc.3d4fd0.001f.GAE@google.com> Subject: [syzbot] [ceph?] WARNING in ceph_con_v2_try_read 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" Hello, syzbot found the following issue on: HEAD commit: 4235cb24ec1e Merge tag 'vfs-7.2-rc5.fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=129ba7b1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e38b15c29e6a1d9 dashboard link: https://syzkaller.appspot.com/bug?extid=87c7c2d63c44e41c77a3 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d96499580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12eaf2ea580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/906b09e16f16/disk-4235cb24.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2cb120bc3818/vmlinux-4235cb24.xz kernel image: https://storage.googleapis.com/syzbot-assets/880615d1b5d5/bzImage-4235cb24.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+87c7c2d63c44e41c77a3@syzkaller.appspotmail.com ------------[ cut here ]------------ !iov_iter_count(&con->v2.in_iter) WARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter net/ceph/messenger_v2.c:3129 [inline], CPU#0: kworker/0:2/188 WARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159, CPU#0: kworker/0:2/188 Modules linked in: CPU: 0 UID: 0 PID: 188 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: ceph-msgr ceph_con_workfn RIP: 0010:populate_in_iter net/ceph/messenger_v2.c:3129 [inline] RIP: 0010:ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159 Code: 8d 3d 70 31 d5 04 43 0f b6 04 3e 84 c0 48 8b 54 24 38 0f 85 85 00 00 00 8b 32 67 48 0f b9 3a e9 40 ff ff ff e8 3d cd 31 f6 90 <0f> 0b 90 41 bd c3 ff ff ff e9 32 ff ff ff e8 29 cd 31 f6 90 0f 0b RSP: 0018:ffffc90002f574a0 EFLAGS: 00010293 RAX: ffffffff8b9536c3 RBX: 0000000000000000 RCX: ffff888020b05d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002f57a78 R08: ffff888033ca86a7 R09: ffff888033ca869b R10: dffffc0000000000 R11: ffffed10067950d5 R12: fffff520005eaee4 R13: 0000000000000000 R14: 0000000000000010 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888124f4e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7c5aa0fff8 CR3: 00000000251ca000 CR4: 0000000000350ef0 Call Trace: ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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