rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=b6ec/1/0x4000000000000000 softirq=14571/14571 fqs=4892
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   965602          1            0
rcu: 	cputime:    25522      26956           93   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=6481 q=2321 ncpus=2)
CPU: 0 UID: 0 PID: 5905 Comm: syz.2.7 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:ffffc90000006fc0 EFLAGS: 00000206
RAX: ad64ab9958360300 RBX: 1ffff92000000e00 RCX: ad64ab9958360300
RDX: 0000000000000002 RSI: ffffffff8d9987c6 RDI: ffffffff8be29f80
RBP: ffffc900000070b8 R08: ffffffff8fa1eaf7 R09: 1ffffffff1f43d5e
R10: dffffc0000000000 R11: fffffbfff1f43d5f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f94de3df6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c33c8ff CR3: 000000010998c000 CR4: 00000000000006f0
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_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kmem_cache_free+0x18f/0x400
 ifb_xmit+0x1e2/0x5c0
 dev_hard_start_xmit+0x2d7/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x17b6/0x3a70
 lapb_data_transmit+0x90/0xb0
 lapb_transmit_buffer+0x163/0x200
 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_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:___slab_alloc+0xa4e/0x1480
Code: 24 60 00 00 00 00 9c 8f 44 24 60 f7 44 24 60 00 02 00 00 0f 85 9c 08 00 00 f7 c5 00 02 00 00 74 01 fb 65 48 8b 05 62 3e 87 10 <48> 3b 44 24 68 0f 85 e9 08 00 00 4c 89 f8 48 83 c4 70 5b 41 5c 41
RSP: 0018:ffffc9000470f620 EFLAGS: 00000206
RAX: ad64ab9958360300 RBX: ffff88804b03e4c0 RCX: ad64ab9958360300
RDX: 0000000000000000 RSI: ffffffff8d9987c6 RDI: ffffffff8be29f80
RBP: 0000000000000286 R08: ffffffff8fa1eaf7 R09: 1ffffffff1f43d5e
R10: dffffc0000000000 R11: fffffbfff1f43d5f R12: ffff88804b03e4c0
R13: ffff88801a441640 R14: 0000000000000000 R15: ffff888027f30460
 __kmalloc_cache_noprof+0x296/0x3d0
 __set_page_owner+0x25c/0x4a0
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x3b0
 ___slab_alloc+0xbfc/0x1480
 kmem_cache_alloc_noprof+0x283/0x3c0
 sk_prot_alloc+0x57/0x220
 sk_alloc+0x3a/0x370
 __smc_create+0xed/0x280
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94dd58eb69
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:00007f94de3df038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f94dd7b5fa0 RCX: 00007f94dd58eb69
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000002b
RBP: 00007f94dd611df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94dd7b5fa0 R15: 00007ffcedee46d8
 </TASK>
sched: DL replenish lagged too much
