rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=4c2c/1/0x4000000000000000 softirq=137453/137453 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=124421, q=379 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 25942 Comm: kworker/u10:19 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:enqueue_hrtimer+0xc3/0x2c0
Code: 00 4c 89 f7 48 c7 c6 80 7d ef 8b e8 37 5d 2c 03 41 0f b6 d7 4c 89 f7 89 ee e8 19 02 00 00 49 89 dc 49 c1 ec 03 43 80 3c 2c 00 <74> 08 48 89 df e8 03 e0 81 00 4c 8b 3b 49 83 c7 51 4c 89 f8 48 c1
RSP: 0018:ffffc90000a085f8 EFLAGS: 00000046
RAX: ffffffff81b3c292 RBX: ffff88823c628400 RCX: ffff88816b495a00
RDX: 0000000000010100 RSI: ffffffff8c4bd560 RDI: ffffffff8c4bd520
RBP: 0000000000000000 R08: ffffffff90573337 R09: 1ffffffff20ae666
R10: dffffc0000000000 R11: fffffbfff20ae667 R12: 1ffff110478c5080
R13: dffffc0000000000 R14: ffff8881b1764300 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a8f56000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d8321f440 CR3: 000000001b85e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x4ce/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__rcu_read_lock+0x29/0x60
Code: 90 f3 0f 1e fa 53 65 48 8b 1d 6b 20 c0 11 48 81 c3 c4 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 18 ff 03 8b 03 3d 00 00 00 40 7d 07 5b e9 d2 c3 26 0a cc
RSP: 0018:ffffc90000a08910 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff88816b495ec4 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: ffffffff824b28c8 RDI: ffffc90000a08a00
RBP: 1ffff92000141140 R08: ffffc90000a08a90 R09: 0000000000000018
R10: ffffc90000a08a18 R11: ffffffff81b1e310 R12: dffffc0000000000
R13: ffffc90005a97c80 R14: ffffc90000a089c8 R15: 1ffff92000141139
 unwind_next_frame+0x88/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 slab_free_after_rcu_debug+0x12a/0x220
 rcu_core+0x78b/0x10a0
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x6d6/0x2550
Code: 8b 6c 24 18 49 8d 55 04 49 8d 5d 05 48 89 d0 48 c1 e8 03 48 89 44 24 30 42 0f b6 04 20 84 c0 48 89 54 24 08 0f 85 93 17 00 00 <48> 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 a3 17 00 00 0f b7
RSP: 0018:ffffc90005a97200 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff90fe3adf RCX: ffffffff907b1cf4
RDX: ffffffff90fe3ade RSI: ffffffff90fe3ada RDI: ffffffff8c4bd520
RBP: ffffc90005a972e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: dffffc0000000000
R13: ffffffff90fe3ada R14: ffffc90005a972a8 R15: 1ffff92000b52e55
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 tomoyo_realpath_from_path+0x605/0x640
 tomoyo_condition+0x1f3d/0x3320
 tomoyo_check_acl+0x182/0x400
 tomoyo_execute_permission+0x123/0x400
 tomoyo_find_next_domain+0x484/0x1a90
 tomoyo_bprm_check_security+0x11b/0x180
 security_bprm_check+0x85/0x240
 bprm_execve+0x918/0x1630
 kernel_execve+0x8c3/0x9c0
 call_usermodehelper_exec_async+0x20f/0x360
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g124421 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:26848 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 25944 Comm: syz.4.8165 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:smp_call_function_many_cond+0x11eb/0x15f0
Code: 1e 89 de 83 e6 01 31 ff e8 42 21 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 ee 1c 0c 00 eb 37 f3 90 41 0f b6 04 1c <84> c0 75 10 41 f7 06 01 00 00 00 74 1e e8 d3 1c 0c 00 eb e5 44 89
RSP: 0018:ffffc9000352f960 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90007aa9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000352fab0 R08: ffffffff90573337 R09: 1ffffffff20ae666
R10: dffffc0000000000 R11: ffffffff8174e150 R12: 1ffff110478c81e1
R13: ffff88812103c4c8 R14: ffff88823c640f08 R15: 0000000000000001
FS:  00007ffa648db6c0(0000) GS:ffff88818d956000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffa63c26080 CR3: 0000000106ac2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 clock_was_set+0x715/0x7e0
 do_adjtimex+0x25d/0x370
 __x64_sys_clock_adjtime+0x252/0x340
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa6399e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa648db028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007ffa63c25fa0 RCX: 00007ffa6399e0d9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007ffa63a35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa63c26038 R14: 00007ffa63c25fa0 R15: 00007ffd94e45a58
 </TASK>
