INFO: rcu detected stall in tipc_conn_send

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
03b73ac9	assessment-security	DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	INFO: rcu detected stall in tipc_conn_send_work	2026/05/26 09:42	2026/05/26 09:42	2026/05/26 10:34	c69befb3

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in tipc_conn_send_work (2) prio:high tipc	1				1	95d	95d	0/29	auto-obsoleted due to no activity on 2026/10/20 22:59

Kernel

Title

Rank 🛈

upstream

INFO: rcu detected stall in tipc_conn_send_work (2) prio:high tipc

95d

0/29

auto-obsoleted due to no activity on 2026/10/20 22:59

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9956/1:b..l rcu: (detected by 0, t=10502 jiffies, g=108781, q=169 ncpus=2) task:kworker/u8:7 state:R running task stack:20520 pid:9956 tgid:9956 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: tipc_send tipc_conn_send_work Call Trace: <TASK> context_switch kernel/sched/core.c:5387 [inline] __schedule+0x169e/0x54f0 kernel/sched/core.c:7188 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7512 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline] irqentry_exit+0x14f/0x730 kernel/entry/common.c:164 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5874 Code: ff ff ff e8 b1 f2 95 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 8b ed d5 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 28 fc ef RSP: 0018:ffffc90004027740 EFLAGS: 00000282 RAX: 8a822f83744cf600 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000000000003 RSI: ffffffff8d8b3bc3 RDI: ffffffff8ba84960 RBP: ffffffff8ad5b23a R08: ffffc90004027560 R09: 0000000000000020 R10: dffffc0000000000 R11: ffffffff81a0ded0 R12: 0000000000000000 R13: ffff888039d848f0 R14: 0000000000000001 R15: 0000000000000246 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56 spin_lock_bh include/linux/spinlock_rt.h:90 [inline] tipc_conn_kref_release net/tipc/topsrv.c:130 [inline] kref_put include/linux/kref.h:65 [inline] conn_put+0x8a/0x380 net/tipc/topsrv.c:148 tipc_conn_send_work+0xa17/0xaa0 net/tipc/topsrv.c:308 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312 process_scheduled_works kernel/workqueue.c:3403 [inline] worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489 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 (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/04/19 13:15	linux-next	c7275b05bc42	303e2802	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-linux-next-kasan-gce-root	INFO: rcu detected stall in tipc_conn_send_work

Crashes (1):

Assets (help?)