rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P999/3:b..l
rcu: (detected by 1, t=10502 jiffies, g=20065, q=4777 ncpus=2)
task:kworker/u8:7 state:R running task stack:20672 pid:999 tgid:999 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: tipc_send tipc_conn_send_work
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2d7/0x3c0 kernel/locking/lockdep.c:5893
Code: fb fc 10 00 00 00 00 eb b5 e8 d5 aa a1 09 f7 c3 00 02 00 00 74 b9 65 48 8b 05 a5 b5 fc 10 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4a 74 a5 09 cc 48 8d 3d a2 f2 11
RSP: 0018:ffffc90005786b68 EFLAGS: 00000282
RAX: 38be2fdbe5585f00 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000006 RSI: ffffffff8daf2dba RDI: ffffffff8bca6680
RBP: ffff888026fe2bf8 R08: ffffc90005786fe0 R09: 0000000000000000
R10: ffffc90005786c98 R11: fffff52000af0d95 R12: 0000000000000006
R13: 0000000000000006 R14: ffffffff8e1c3000 R15: ffff888026fe1f00
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2705 [inline]
slab_free mm/slub.c:6405 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6532
kfree_skb_reason include/linux/skbuff.h:1323 [inline]
kfree_skb include/linux/skbuff.h:1332 [inline]
tipc_sk_proto_rcv+0x7a1/0x1810 net/tipc/socket.c:2184
tipc_sk_filter_rcv+0x3005/0x3240 net/tipc/socket.c:2356
tipc_sk_enqueue net/tipc/socket.c:2449 [inline]
tipc_sk_rcv+0x8c4/0x2b30 net/tipc/socket.c:2501
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+0x6cd/0xa50 net/tipc/topsrv.c:306
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
rcu: rcu_preempt kthread timer wakeup didn't happen for 9427 jiffies! g20065 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=10110
rcu: rcu_preempt kthread starved for 9428 jiffies! g20065 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:27784 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
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
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6969 Comm: syz.1.296 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:find_held_lock kernel/locking/lockdep.c:5348 [inline]
RIP: 0010:__lock_release kernel/locking/lockdep.c:5535 [inline]
RIP: 0010:lock_release+0xe8/0x3c0 kernel/locking/lockdep.c:5889
Code: 8b 87 00 0c 00 00 85 c0 0f 84 17 01 00 00 4c 89 6c 24 18 48 89 5c 24 08 44 8d 60 ff 49 8d af 08 0c 00 00 4d 63 ec 48 89 04 24 <83> f8 32 0f 83 2a 02 00 00 4a 8d 1c ad 00 00 00 00 4c 01 eb 48 8d
RSP: 0018:ffffc900103af160 EFLAGS: 00000006
RAX: 0000000000000005 RBX: 0000000000000002 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d89d21e RDI: ffffffff8bca6680
RBP: ffff88802c850c08 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52002075e28 R12: 0000000000000004
R13: 0000000000000004 R14: ffffc900103af9b0 R15: ffff88802c850000
FS: 00007efd89d556c0(0000) GS:ffff888125c45000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff4be0c9e9c CR3: 000000002bd0c000 CR4: 00000000003526f0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
_raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:198
unlock_rt_mutex_safe kernel/locking/rtmutex.c:350 [inline]
rt_mutex_slowunlock+0x4ee/0xa20 kernel/locking/rtmutex.c:1467
rt_spin_unlock+0x10d/0x200 kernel/locking/spinlock_rt.c:84
spin_unlock_bh include/linux/spinlock_rt.h:115 [inline]
tipc_skb_peek_port net/tipc/msg.h:1235 [inline]
tipc_sk_rcv+0x43b/0x2b30 net/tipc/socket.c:2495
tipc_node_xmit+0x218/0xf10 net/tipc/node.c:1701
tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
tipc_node_distr_xmit+0x2da/0x420 net/tipc/node.c:1781
tipc_group_join+0x571/0x710 net/tipc/group.c:208
tipc_sk_join+0x480/0x6a0 net/tipc/socket.c:3106
tipc_setsockopt+0x73e/0x9a0 net/tipc/socket.c:3204
do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2368
__sys_setsockopt net/socket.c:2393 [inline]
__do_sys_setsockopt net/socket.c:2399 [inline]
__se_sys_setsockopt net/socket.c:2396 [inline]
__x64_sys_setsockopt+0x143/0x1b0 net/socket.c:2396
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: 0033:0x7efd8bb1de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efd89d55028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007efd8bda6090 RCX: 00007efd8bb1de99
RDX: 0000000000000087 RSI: 000000000000010f RDI: 0000000000000007
RBP: 00007efd8bbb3eaf R08: 0000000000000010 R09: 0000000000000000
R10: 0000200000000440 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd8bda6128 R14: 00007efd8bda6090 R15: 00007fff1b5c06e8