INFO: rcu detected stall in inet_stream_connect (5)

Status: auto-obsoleted due to no activity on 2026/10/05 04:12
Subsystems: net
Labels: prio:low
[Documentation on labels]
First crash: 132d, last: 101d
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
b1ffe2d2 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: rcu detected stall in inet_stream_connect (5) 2026/06/11 00:32 2026/06/11 00:32 2026/06/11 01:09 416ea548
2611cae1 assessment-security 💥 INFO: rcu detected stall in inet_stream_connect (5) 2026/06/09 14:57 2026/06/09 14:57 2026/06/09 14:57 c36c07f6
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in inet_stream_connect (2) mm 1 1 2509d 2509d 0/29 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in inet_stream_connect netfilter 1 1 2775d 2775d 0/29 auto-closed as invalid on 2019/09/08 01:40
upstream INFO: rcu detected stall in inet_stream_connect (4) net 1 1 724d 724d 0/29 auto-obsoleted due to no activity on 2025/01/20 17:38
upstream INFO: rcu detected stall in inet_stream_connect (3) net 1 1 893d 893d 0/29 auto-obsoleted due to no activity on 2024/08/04 05:17
android-5-15 BUG: soft lockup in inet_stream_connect 1 1 893d 893d 0/2 auto-obsoleted due to no activity on 2024/08/04 08:02

Sample crash report:
sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9747/3:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=252169, q=729975 ncpus=2)
task:syz.4.9355      state:R  running task     stack:25656 pid:9747  tgid:9745  ppid:8019   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8b0 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0xd8/0x130 kernel/softirq.c:457
Code: 8b e8 ac c5 1f 0a 65 66 8b 05 ec 32 b0 11 66 85 c0 75 32 bf 01 00 00 00 e8 d5 fb 0b 00 e8 e0 16 46 00 fb 65 8b 05 c8 32 b0 11 <85> c0 75 05 e8 bf bd ab ff 5b 41 5e c3 cc cc cc cc cc 90 0f 0b 90
RSP: 0018:ffffc9000433f088 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000046
RDX: 0000000000000006 RSI: ffffffff8dfa4d19 RDI: ffffffff8c28b8e0
RBP: ffffc9000433f358 R08: ffffffff903034f7 R09: 1ffffffff206069e
R10: dffffc0000000000 R11: fffffbfff206069f R12: ffff888046f14000
R13: 1ffff92000867e34 R14: ffffffff897b97f6 R15: 0000000000000000
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:912 [inline]
 __dev_queue_xmit+0x1fe5/0x3950 net/core/dev.c:4905
 dev_queue_xmit include/linux/netdevice.h:3418 [inline]
 neigh_hh_output include/net/neighbour.h:544 [inline]
 neigh_output include/net/neighbour.h:558 [inline]
 ip_finish_output2+0xc68/0x1070 net/ipv4/ip_output.c:237
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_output+0x29f/0x450 net/ipv4/ip_output.c:438
 __ip_queue_xmit+0x116a/0x1bb0 net/ipv4/ip_output.c:534
 __tcp_transmit_skb+0x2d76/0x4790 net/ipv4/tcp_output.c:1715
 tcp_transmit_skb net/ipv4/tcp_output.c:1733 [inline]
 tcp_connect+0x227d/0x53a0 net/ipv4/tcp_output.c:4374
 tcp_v4_connect+0x10f7/0x19b0 net/ipv4/tcp_ipv4.c:345
 __inet_stream_connect+0x25a/0xdd0 net/ipv4/af_inet.c:684
 inet_stream_connect+0x66/0xa0 net/ipv4/af_inet.c:755
 __sys_connect_file net/socket.c:2148 [inline]
 __sys_connect+0x312/0x450 net/socket.c:2167
 __do_sys_connect net/socket.c:2173 [inline]
 __se_sys_connect net/socket.c:2170 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2170
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff35f39ce59
RSP: 002b:00007ff3601d9028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007ff35f615fa0 RCX: 00007ff35f39ce59
RDX: 0000000000000010 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007ff35f432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff35f616038 R14: 00007ff35f615fa0 R15: 00007ffcfbe758b8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/06 10:15 net c93952cc0034 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in inet_stream_connect
2026/07/07 04:09 net-next 474cff686812 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in inet_stream_connect
* Struck through repros no longer work on HEAD.