WARNING in ceph_con_v2_try_read

Status: upstream: reported C repro on 2026/07/27 06:59
Reported-by: syzbot+0dc33bac91300aa25c34@syzkaller.appspotmail.com
First crash: 97d, last: 50d
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2026/09/29 upstream (ToT) 72d3fcf802c4 C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in ceph_con_v2_try_read origin:upstream -1 syz, C 6 51d 97d 0/3 upstream: reported C repro on 2026/07/27 08:33
upstream WARNING in ceph_con_v2_try_read prio:high ceph -1 syz, C 45 78d 93d 27/29 upstream: reported C repro on 2026/07/31 07:09
linux-6.6 WARNING in ceph_con_v2_try_read origin:upstream -1 syz, C error 12 51d 96d 0/2 upstream: reported C repro on 2026/07/27 22:59

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6411 at net/ceph/messenger_v2.c:2940 populate_in_iter net/ceph/messenger_v2.c:2940 [inline]
WARNING: CPU: 1 PID: 6411 at net/ceph/messenger_v2.c:2940 ceph_con_v2_try_read+0x71c6/0x7330 net/ceph/messenger_v2.c:2970
Modules linked in:
CPU: 1 PID: 6411 Comm: kworker/1:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: ceph-msgr ceph_con_workfn
RIP: 0010:populate_in_iter net/ceph/messenger_v2.c:2940 [inline]
RIP: 0010:ceph_con_v2_try_read+0x71c6/0x7330 net/ceph/messenger_v2.c:2970
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 e8 35 89 8e f7 48 c7 c7 a0 97 ad 8b 44 89 f6 e8 76 10 5a f7 0f 0b e9 45 ff ff ff e8 1a 89 8e f7 <0f> 0b 41 bd c3 ff ff ff e9 39 ff ff ff e8 08 89 8e f7 0f 0b 41 bd
RSP: 0018:ffffc9000d6976c0 EFLAGS: 00010293
RAX: ffffffff89f3b876 RBX: dffffc0000000000 RCX: ffff88802bc5bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d697bb8 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000006 R11: 0000000000000000 R12: fffff52001ad2f24
R13: 1ffff1100e2218e7 R14: 0000000000000000 R15: ffff88807110c6c0
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea96cadff8 CR3: 000000001cbb3000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ceph_con_workfn+0x1ed/0x1110 net/ceph/messenger.c:1503
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/12 06:11 linux-6.1.y cf82dcca9634 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/12 06:11 linux-6.1.y cf82dcca9634 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/11 14:50 linux-6.1.y cf82dcca9634 b6a5eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/11 14:46 linux-6.1.y cf82dcca9634 b6a5eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/10 17:36 linux-6.1.y cf82dcca9634 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/10 17:34 linux-6.1.y cf82dcca9634 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/10 17:31 linux-6.1.y cf82dcca9634 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/10 17:30 linux-6.1.y cf82dcca9634 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/07/28 00:22 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ceph_con_v2_try_read
2026/09/10 10:00 linux-6.1.y cf82dcca9634 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/09/10 09:59 linux-6.1.y cf82dcca9634 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/08/17 07:46 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/08/17 07:45 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/07/27 20:12 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/07/27 20:12 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/07/27 07:45 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/07/27 07:01 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
2026/07/27 06:58 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ceph_con_v2_try_read
* Struck through repros no longer work on HEAD.