rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10471 ticks this GP) idle=d7d4/1/0x4000000000000000 softirq=40960/41271 fqs=4954
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1398609        914            0
rcu: 	cputime:    29633      22854           72   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=31557 q=15367 ncpus=2)
rcu: rcu_preempt kthread starved for 382 jiffies! g31557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26664 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 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>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10135 Comm: syz-executor 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:native_queued_spin_lock_slowpath+0xaf/0x8e0
Code: 00 00 00 c7 44 24 60 00 00 00 00 0f 1f 44 00 00 4c 8d 74 24 60 49 89 df 49 c1 ef 03 41 bd 01 00 00 00 eb 06 89 44 24 60 f3 90 <48> 89 df be 04 00 00 00 e8 f4 44 a7 f6 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90002bcf7c0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8dfab280 RCX: ffffffff8b7bde5c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8dfab280
RBP: ffffc90002bcf8b8 R08: ffffffff8dfab283 R09: 1ffffffff1bf5650
R10: dffffc0000000000 R11: fffffbfff1bf5651 R12: 1ffff92000579f00
R13: 0000000000000001 R14: ffffc90002bcf820 R15: 1ffffffff1bf5650
FS:  00005555906e7500(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f11352ad82e CR3: 000000001ff6a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 queued_spin_lock_slowpath+0x43/0x50
 do_raw_spin_lock+0x21f/0x290
 pgd_free+0x51/0x1e0
 __mmdrop+0xb5/0x580
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f828dd84e13
Code: Unable to access opcode bytes at 0x7f828dd84de9.
RSP: 002b:00007ffca1ecf658 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000000000002798 RCX: 00007f828dd84e13
RDX: 0000000040000000 RSI: 00007ffca1ecf66c RDI: 00000000ffffffff
RBP: 00007ffca1ecf66c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
CPU: 0 UID: 0 PID: 10103 Comm: syz.7.1199 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:check_slab_allocation+0x84/0x130
Code: 0b 48 c1 e6 06 48 03 35 c2 78 9a 0b 4c 89 f0 48 29 f0 41 8b 7f 18 48 89 c2 48 c1 ea 20 74 07 48 99 48 f7 ff eb 04 31 d2 f7 f7 <4c> 89 f0 48 29 d0 0f b7 49 2a 81 e1 ff 7f 00 00 ff c9 0f af cf 48
RSP: 0018:ffffc90000007b68 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff81a7f95b RCX: ffffea0000aa0a00
RDX: 0000000000000000 RSI: ffff88802a828000 RDI: 0000000000000508
RBP: 000000000029a100 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffffea0000aa0a00
R13: 0000000000000000 R14: ffff88802a828f18 R15: ffff8881000148c0
FS:  00007fdd7f3e96c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f11352c2b11 CR3: 0000000113ce6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000082 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 kmem_cache_free+0x140/0x400
 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:ffffc9000363f2a0 EFLAGS: 00000287
RAX: ffffffff8174859b RBX: ffff88803f12a000 RCX: 0000000000080000
RDX: ffffc90003963000 RSI: 00000000000002a5 RDI: 00000000000002a6
RBP: ffffc9000363f390 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520006c7e48 R12: ffff888108255b98
R13: dffffc0000000000 R14: ffffea0000000000 R15: dffffc0000000000
 __phys_addr+0x1b/0x180
 pgd_free+0x7e/0x1e0
 __mmdrop+0xb5/0x580
 finish_task_switch+0x3ee/0x950
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule+0x0/0xc0
Code: 00 00 e8 93 9c 15 f6 e9 ce bc 01 00 cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 56 53 48 83 e4 e0 48 83 ec 60 65 48 8b
RSP: 0018:ffffc9000363f720 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000a06 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8d9b6a0a RDI: 00000000ffffffff
RBP: ffffc9000363f770 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: dffffc0000000000
R13: ffff888116150000 R14: ffffffff99ceb320 R15: 1ffff920006c7ef0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irqrestore+0xfd/0x110
 debug_check_no_obj_freed+0x451/0x470
 __free_frozen_pages+0x4dd/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x224/0x4f0
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd7e58ebe9
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:00007fdd7f3e9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdd7e7b5fa0 RCX: 00007fdd7e58ebe9
RDX: 00002000000013c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007fdd7e611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd7e7b6038 R14: 00007fdd7e7b5fa0 R15: 00007ffe9ac3c948
 </TASK>
