rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1402/2:b..l
rcu: (detected by 0, t=10502 jiffies, g=16797, q=3088 ncpus=2)
task:kworker/u8:12 state:R running task stack:22152 pid:1402 tgid:1402 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: tipc_send tipc_conn_send_work
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6929
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 cb 93 e3 0f <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900054872c0 EFLAGS: 00000206
RAX: d98ca17595251d00 RBX: 0000000000000000 RCX: d98ca17595251d00
RDX: 0000000000030000 RSI: ffffffff8cd66fcd RDI: ffffffff8b1d9960
RBP: ffffffff818370a1 R08: ffffc900054870e0 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819b2c90 R12: 0000000000000002
R13: ffffffff8d24a9a0 R14: 0000000000000001 R15: 0000000000000246
__local_bh_disable_ip+0xc5/0x540 kernel/softirq.c:163
local_bh_disable include/linux/bottom_half.h:20 [inline]
spin_lock_bh include/linux/spinlock_rt.h:87 [inline]
tipc_skb_dequeue net/tipc/msg.h:1248 [inline]
tipc_sk_enqueue net/tipc/socket.c:2437 [inline]
tipc_sk_rcv+0x65f/0x2d20 net/tipc/socket.c:2495
tipc_topsrv_kern_evt net/tipc/topsrv.c:630 [inline]
tipc_conn_send_to_sock net/tipc/topsrv.c:286 [inline]
tipc_conn_send_work+0x688/0x9b0 net/tipc/topsrv.c:306
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 2971 jiffies! g16797 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=12325
rcu: rcu_preempt kthread starved for 2972 jiffies! g16797 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:27320 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 7613 Comm: syz.1.469 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 cb 93 e3 0f <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900052f7140 EFLAGS: 00000206
RAX: ffb4f2544f63b700 RBX: 0000000000000000 RCX: ffb4f2544f63b700
RDX: 0000000000000000 RSI: ffffffff8cd66fcd RDI: ffffffff8b1d9960
RBP: ffffffff818370a1 R08: 0000000000000000 R09: ffffffff818370a1
R10: dffffc0000000000 R11: ffffed1006796991 R12: 0000000000000002
R13: ffffffff8d24a9a0 R14: 0000000000000001 R15: 0000000000000246
FS: 00007fe3c7aed6c0(0000) GS:ffff88812703b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc627505000 CR3: 0000000035fba000 CR4: 00000000003526f0
Call Trace:
__local_bh_disable_ip+0xc5/0x540 kernel/softirq.c:163
local_bh_disable include/linux/bottom_half.h:20 [inline]
spin_lock_bh include/linux/spinlock_rt.h:87 [inline]
tipc_skb_peek_port net/tipc/msg.h:1225 [inline]
tipc_sk_rcv+0x256/0x2d20 net/tipc/socket.c:2489
tipc_node_xmit+0x1e4/0xe40 net/tipc/node.c:1701
tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
tipc_node_distr_xmit+0x2a7/0x3b0 net/tipc/node.c:1781
tipc_group_join+0x53e/0x6b0 net/tipc/group.c:208
tipc_sk_join+0x46a/0x6b0 net/tipc/socket.c:3102
tipc_setsockopt+0x735/0x970 net/tipc/socket.c:3200
do_sock_setsockopt+0x179/0x1b0 net/socket.c:2360
__sys_setsockopt net/socket.c:2385 [inline]
__do_sys_setsockopt net/socket.c:2391 [inline]
__se_sys_setsockopt net/socket.c:2388 [inline]
__x64_sys_setsockopt+0x145/0x1b0 net/socket.c:2388
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe3c98aeec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe3c7aed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fe3c9b06090 RCX: 00007fe3c98aeec9
RDX: 0000000000000087 RSI: 000000000000010f RDI: 0000000000000006
RBP: 00007fe3c9931f91 R08: 0000000000000010 R09: 0000000000000000
R10: 0000200000000440 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe3c9b06128 R14: 00007fe3c9b06090 R15: 00007fff8ba95278