WARNING in ceph_con_v1_try_read

Status: upstream: reported C repro on 2026/08/07 14:37
Subsystems: ceph
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+21f8628595b2061c438d@syzkaller.appspotmail.com
First crash: 4d08h, last: 3d14h
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
56e865ad patching WARNING in ceph_con_v1_try_read 2026/08/07 17:24
8a795c6e assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ✅ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in ceph_con_v1_try_read 2026/08/04 02:08 2026/08/04 02:08 2026/08/04 03:00 cb1adeae
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ceph?] WARNING in ceph_con_v1_try_read 0 (1) 2026/08/07 14:37
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in ceph_con_v1_try_read -1 syz, C 11 3d10h 4d03h 0/3 upstream: reported C repro on 2026/08/03 19:06
linux-6.1 WARNING in ceph_con_v1_try_read -1 syz, C 16 4d01h 4d05h 0/3 upstream: reported C repro on 2026/08/03 17:32
linux-6.6 WARNING in ceph_con_v1_try_read -1 5 4d00h 4d00h 0/2 upstream: reported on 2026/08/03 22:36

Sample crash report:
------------[ cut here ]------------
con->v1.connect_seq != le32_to_cpu(con->v1.in_reply.connect_seq)
WARNING: net/ceph/messenger_v1.c:902 at process_connect net/ceph/messenger_v1.c:901 [inline], CPU#0: kworker/0:2/198
WARNING: net/ceph/messenger_v1.c:902 at ceph_con_v1_try_read+0x3335/0x6eb0 net/ceph/messenger_v1.c:1366, CPU#0: kworker/0:2/198
Modules linked in:
CPU: 0 UID: 0 PID: 198 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: ceph-msgr ceph_con_workfn
RIP: 0010:process_connect net/ceph/messenger_v1.c:901 [inline]
RIP: 0010:ceph_con_v1_try_read+0x3335/0x6eb0 net/ceph/messenger_v1.c:1366
Code: 45 31 e4 e9 3f d1 ff ff e8 68 a6 be f6 90 0f 0b 90 e9 cd d3 ff ff e8 5a a6 be f6 90 0f 0b 90 e9 dd e6 ff ff e8 4c a6 be f6 90 <0f> 0b 90 e9 f4 e7 ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 30 d1
RSP: 0018:ffffc90003c5f180 EFLAGS: 00010293
RAX: ffffffff8b073574 RBX: 0000000000000001 RCX: ffff88802137dd00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003c5fa78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 000000000000000d R12: ffff88803e894488
R13: fffff5200078be70 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4e8ed7d58 CR3: 0000000045d70000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ceph_con_workfn+0x208/0x14a0 net/ceph/messenger.c:1577
 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
 </TASK>

Crashes (52):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/03 16:29 upstream 075b74841bd0 e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in ceph_con_v1_try_read
2026/08/03 15:37 upstream 075b74841bd0 e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/03 15:01 upstream 075b74841bd0 bdd50915 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 16:04 linux-next cc2b5f627e8c e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in ceph_con_v1_try_read
2026/08/03 21:02 upstream 075b74841bd0 a68cb31b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ceph_con_v1_try_read
2026/08/03 15:41 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:40 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:40 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:39 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:37 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:36 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:36 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:34 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:34 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:32 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:27 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:27 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ceph_con_v1_try_read
2026/08/03 15:03 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in ceph_con_v1_try_read
2026/08/03 15:03 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in ceph_con_v1_try_read
2026/08/03 14:57 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/03 14:53 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in ceph_con_v1_try_read
2026/08/03 14:53 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in ceph_con_v1_try_read
2026/08/03 14:50 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/03 14:46 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/03 14:44 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/03 14:42 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/03 14:42 upstream 075b74841bd0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in ceph_con_v1_try_read
2026/08/04 08:27 upstream 848acc8ffe1b 9451e17e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 15:40 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:54 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:53 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:45 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:44 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:43 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:41 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:40 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:39 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:38 upstream 075b74841bd0 bdd50915 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ceph_con_v1_try_read
2026/08/03 14:38 upstream 075b74841bd0 bdd50915 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ceph_con_v1_try_read
2026/08/03 14:36 upstream 075b74841bd0 bdd50915 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ceph_con_v1_try_read
2026/08/03 14:35 upstream 075b74841bd0 bdd50915 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ceph_con_v1_try_read
2026/08/03 14:34 upstream 075b74841bd0 bdd50915 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ceph_con_v1_try_read
2026/08/03 14:34 upstream 075b74841bd0 bdd50915 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ceph_con_v1_try_read
2026/08/03 14:32 upstream 075b74841bd0 bdd50915 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in ceph_con_v1_try_read
2026/08/03 14:32 linux-next cc2b5f627e8c e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in ceph_con_v1_try_read
* Struck through repros no longer work on HEAD.