rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=bd54/1/0x4000000000000000 softirq=13943/13944 fqs=5248
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1018571          0            0
rcu: 	cputime:    33819      18670           92   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=6637 q=4925 ncpus=2)
CPU: 1 UID: 0 PID: 5972 Comm: syz.1.26 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:stack_trace_consume_entry+0x2c/0x280
Code: 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00 00 00 00 fc ff df 4c 8d 47 10 4c 89 c5 48 c1 ed 03 0f b6 44 15 00 <84> c0 0f 85 09 01 00 00 44 8b 4f 10 4c 8d 77 08 4d 89 f5 49 c1 ed
RSP: 0018:ffffc900001e0758 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffc900001e0860 RCX: 20554ad24c784f00
RDX: dffffc0000000000 RSI: ffffffff82392dd2 RDI: ffffc900001e0860
RBP: 1ffff9200003c10e R08: ffffc900001e0870 R09: 0000000000000000
R10: ffffc900001e07f8 R11: ffffffff81ac3930 R12: ffff888107ab8000
R13: 0000000000000000 R14: ffffffff81ac3930 R15: ffffc900001e07a8
FS:  00007f3ecbfea6c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000013c0 CR3: 0000000027068000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x110/0x150
 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:__sanitizer_cov_trace_pc+0x5d/0x70
Code: 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> cc cc cc cc cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90
RSP: 0018:ffffc9000452f720 EFLAGS: 00000293
RAX: ffffffff822e64f2 RBX: 0000000000012a44 RCX: ffff888107ab8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000012a44
RBP: ffffc9000452f9e0 R08: ffff888109116987 R09: 1ffff11021222d30
R10: dffffc0000000000 R11: ffffed1021222d31 R12: 0000000012a44225
R13: 0000000000000000 R14: 0000000000012a44 R15: 0000000000000001
 pfn_valid+0x12/0x490
 page_table_check_set+0x25/0x730
 set_ptes+0x231/0x240
 __handle_mm_fault+0x3a51/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0x764/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:__get_user_4+0x14/0x20
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 ba 00 f0 ff ff ff 7f 00 00 48 39 d0 48 0f 47 c2 0f 1f 00 <8b> 10 31 c0 0f 1f 00 e9 50 03 04 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000452fc18 EFLAGS: 00010287
RAX: 00002000000013c0 RBX: ffff888027f5fc00 RCX: 20554ad24c784f00
RDX: 00007ffffffff000 RSI: ffffffff8dba5cac RDI: ffffffff8be33300
RBP: ffffc9000452fea8 R08: 0000000000000000 R09: ffffffff820b8310
R10: 00000000c020660b R11: 0000000000000000 R12: 0000000000005452
R13: 1ffff920008a5f88 R14: ffff888027f5fc00 R15: ffff88801dc47250
 do_vfs_ioctl+0x162/0x1430
 __se_sys_ioctl+0x82/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ecb18ebe9
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:00007f3ecbfea038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3ecb3b5fa0 RCX: 00007f3ecb18ebe9
RDX: 00002000000013c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f3ecb211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ecb3b6038 R14: 00007f3ecb3b5fa0 R15: 00007fff51367298
 </TASK>
