rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10317 ticks this GP) idle=231c/1/0x4000000000000000 softirq=33072/33119 fqs=5147
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   873956         80            0
rcu: 	cputime:    32362      20127           50   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=26721 q=1527 ncpus=2)
CPU: 0 UID: 0 PID: 9913 Comm: syz.0.1150 Not tainted syzkaller #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:unwind_next_frame+0x37c/0x2390
Code: bd 00 00 00 00 00 fc ff df 0f 84 37 01 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 6d 19 00 00 <4c> 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 80 19 00 00 41 0f b6
RSP: 0018:ffffc900000076d8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff9011117c RCX: ffffffff90111184
RDX: ffffffff90b9dcb2 RSI: ffffffff90b9dcb2 RDI: ffffffff8be33da0
RBP: dffffc0000000000 R08: 0000000000000005 R09: ffffffff8172d195
R10: dffffc0000000000 R11: ffffffff81ac4d00 R12: ffffffff90b9dcb6
R13: ffffffff90b9dcb7 R14: ffffc900000077a8 R15: ffffffff90111180
FS:  00007f58da0f96c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcf9e57b0 CR3: 00000001098de000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000f0602
Call Trace:
 <IRQ>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 slab_free_after_rcu_debug+0x60/0x2a0
 rcu_core+0xcab/0x1770
 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:rcu_read_unlock_special+0x87/0x4b0
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 d2 82 f9 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90002dd68c0 EFLAGS: 00000206
RAX: e2969eaea317e000 RBX: 1ffff920005bad1c RCX: e2969eaea317e000
RDX: 0000000000000006 RSI: ffffffff8d9ba18b RDI: ffffffff8be33e00
RBP: ffffc90002dd6998 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffffffff8e13f401
R13: dffffc0000000000 R14: 0000000000000246 R15: ffff888020bf5640
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 pagetable_dtor_free+0x2d2/0x3b0
 __mmdrop+0xb5/0x570
 finish_task_switch+0x3ee/0x950
 __schedule+0x17a0/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 __wait_for_common+0x3da/0x710
 wait_for_completion_state+0x1c/0x40
 call_usermodehelper_exec+0x3d3/0x4b0
 __request_module+0x3c0/0x5e0
 crypto_alg_mod_lookup+0xa5/0x5f0
 crypto_type_has_alg+0x28/0x60
 xfrm_probe_algs+0x9e/0x360
 pfkey_register+0x113/0x890
 pfkey_sendmsg+0xbfe/0x1090
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f58d918eba9
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:00007f58da0f9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f58d93d5fa0 RCX: 00007f58d918eba9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000008
RBP: 00007f58d9211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58d93d6038 R14: 00007f58d93d5fa0 R15: 00007fffd86a7f48
 </TASK>
sched: DL replenish lagged too much
