rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13145/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=108437, q=4345 ncpus=2)
task:syz.2.1508      state:R  running task     stack:25704 pid:13145 tgid:13144 ppid:5609   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x16ec/0x5620 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:debug_lockdep_rcu_enabled+0x0/0x40 kernel/rcu/update.c:319
Code: 48 8d 3d e3 2e 50 04 48 c7 c6 98 aa 3e 8d 67 48 0f b9 3a 90 eb ca cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 31 c0 83 3d c3 fc 4c 04 00 74 1d 83 3d da 0e 4d 04 00
RSP: 0018:ffffc90003fbf3d0 EFLAGS: 00000286
RAX: fe4d20aaf0f43a00 RBX: ffff8880b8946460 RCX: 0000000000000046
RDX: 00000000f868a0fc RSI: ffffffff8d65e53b RDI: ffffffff8b8759e0
RBP: 0000000000000001 R08: ffffffff8b1dc10c R09: ffffffff8ddc80c0
R10: dffffc0000000000 R11: fffffbfff1ed0adf R12: dffffc0000000000
R13: ffff8880b8946450 R14: ffff8880b8946468 R15: ffff888030221ec0
 rcu_read_lock include/linux/rcupdate.h:839 [inline]
 __rt_spin_trylock kernel/locking/spinlock_rt.c:110 [inline]
 rt_spin_trylock+0x131/0x2b0 kernel/locking/spinlock_rt.c:118
 __pcs_replace_empty_main+0x538/0x720 mm/slub.c:4666
 alloc_from_pcs mm/slub.c:4750 [inline]
 slab_alloc_node mm/slub.c:4884 [inline]
 kmem_cache_alloc_node_noprof+0x4f4/0x6e0 mm/slub.c:4951
 kmalloc_reserve net/core/skbuff.c:613 [inline]
 __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713
 alloc_skb_fclone include/linux/skbuff.h:1433 [inline]
 tipc_buf_acquire net/tipc/msg.c:72 [inline]
 tipc_msg_build+0x162/0xf00 net/tipc/msg.c:402
 __tipc_sendstream+0x8a8/0x1280 net/tipc/socket.c:1615
 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1546
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0x94c/0x9c0 net/socket.c:2698
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752
 __sys_sendmmsg+0x282/0x4e0 net/socket.c:2841
 __do_sys_sendmmsg net/socket.c:2868 [inline]
 __se_sys_sendmmsg net/socket.c:2865 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2865
 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: 0033:0x7f3bafedce59
RSP: 002b:00007f3bae136028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f3bb0155fa0 RCX: 00007f3bafedce59
RDX: 04000000000001c0 RSI: 00002000000044c0 RDI: 000000000000000a
RBP: 00007f3baff72d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3bb0156038 R14: 00007f3bb0155fa0 R15: 00007ffcfffac918
 </TASK>