rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=1c74/1/0x4000000000000000 softirq=16583/16583 fqs=0
rcu: 	(t=10500 jiffies g=9521 q=3369 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g9521 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3195
rcu: rcu_preempt kthread starved for 10501 jiffies! g9521 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:26792 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x16f5/0x4d00
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
CPU: 1 UID: 0 PID: 6519 Comm: syz.2.287 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 92 37 f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e04a0 EFLAGS: 00000206
RAX: 25a03828efff2e00 RBX: 1ffff9200003c09c RCX: 25a03828efff2e00
RDX: 0000000000000002 RSI: ffffffff8d9987c6 RDI: ffffffff8be29f80
RBP: ffffc900001e0598 R08: ffffffff8fa1eaf7 R09: 1ffffffff1f43d5e
R10: dffffc0000000000 R11: fffffbfff1f43d5f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f36b544b6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f36b544afc8 CR3: 00000000270f4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 lapb_send_control+0x38/0x3e0
 lapb_t1timer_expiry+0x699/0xab0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__futex_wait+0x1d6/0x3e0
Code: 00 00 48 3b 44 24 28 0f 84 36 01 00 00 e8 a2 bd 0b 00 e8 5d 4c bb 09 eb 05 e8 96 bd 0b 00 4c 8d 2d 00 00 00 00 48 8b 44 24 50 <42> 80 3c 20 00 48 8b 44 24 18 74 0f 48 8b 7c 24 18 e8 84 e4 6e 00
RSP: 0018:ffffc90002e8fa20 EFLAGS: 00000246
RAX: 1ffff110055232f1 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8be29f60 RDI: 00000000ffffffff
RBP: ffffc90002e8fbd0 R08: ffffffff8fa1eaf7 R09: 1ffffffff1f43d5e
R10: dffffc0000000000 R11: fffffbfff1f43d5f R12: dffffc0000000000
R13: ffffffff81b46031 R14: ffffc90002e8faa0 R15: ffff88802a918000
 futex_wait+0x104/0x360
 do_futex+0x333/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f36b458eb69
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:00007f36b544b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f36b47b6088 RCX: 00007f36b458eb69
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f36b47b6088
RBP: 00007f36b47b6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36b47b608c
R13: 0000000000000000 R14: 00007fffe56f4df0 R15: 00007fffe56f4ed8
 </TASK>
sched: DL replenish lagged too much
