rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=8704/1/0x4000000000000000 softirq=190520/190528 fqs=5
rcu: 	(detected by 0, t=10502 jiffies, g=180933, q=384 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9596 Comm: syz.4.15837 Tainted: G             L      syzkaller #0 PREEMPT(full) 
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:__remove_hrtimer+0x14c/0x3e0
Code: 5d e9 d8 f9 33 0a cc 4d 8d 67 08 4c 89 e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 f4 01 00 00 45 8b 24 24 bf 20 00 00 00 44 89 e6 <e8> 6f 5f 13 00 49 83 fc 1f 0f 87 f7 01 00 00 e8 60 5a 13 00 bb fe
RSP: 0018:ffffc90000a18d78 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 1ffff1102c0f0867 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000020
RBP: dffffc0000000000 R08: ffff888160784327 R09: 0000000000000000
R10: ffff888160784318 R11: ffffed102c0f0865 R12: 0000000000000001
R13: 0000000000000000 R14: ffff888160784300 R15: ffff88823c6283c0
FS:  00007fee8c0046c0(0000) GS:ffff8882a8ccc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ea23ffc CR3: 0000000177b2c000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x295/0xa10
 hrtimer_interrupt+0x4cd/0xaa0
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x232/0x350
Code: ff ff ff e8 e0 3a 42 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 c2 25 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 57 79 da
RSP: 0018:ffffc90007ab7460 EFLAGS: 00000296
RAX: 768e0520be741000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000105209fd RSI: ffffffff8e7023ce RDI: ffffffff8c6dcc80
RBP: ffff88817b3f1e00 R08: b100000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5cbe0 R12: ffffffff8ed5cbe0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
 unwind_next_frame+0xac/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x36b/0x720
 aa_label_asxprint+0x70/0x130
 apparmor_lsmprop_to_secctx+0x9d/0x170
 audit_log_subj_ctx+0x11b/0x530
 audit_log_task_context+0x94/0xe0
 audit_log_task+0x19b/0x3d0
 audit_seccomp+0x85/0x190
 __seccomp_filter+0xd14/0x1de0
 do_syscall_64+0x11f/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee8b19e159
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:00007fee8c0040e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fee8b425fa8 RCX: 00007fee8b19e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fee8b425fa8
RBP: 00007fee8b425fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fee8b426038 R14: 00007fff8411f260 R15: 00007fff8411f348
 </TASK>
rcu: rcu_preempt kthread starved for 10491 jiffies! g180933 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x38b/0x480
 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: 9584 Comm: syz.9.15832 Tainted: G             L      syzkaller #0 PREEMPT(full) 
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+0x61e/0x1500
Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 51 54 0c 00 41 83 e7 01 75 07 e8 46 4f 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01
RSP: 0018:ffffc900081a7560 EFLAGS: 00000293
RAX: ffffffff81bb6abe RBX: ffff88823c641688 RCX: ffff88811dc80000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900081a76b0 R08: ffff88811dc8159f R09: 1ffff11023b902b3
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110478c82d1
R13: 0000000000000001 R14: ffff88823c641680 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818d6cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c61ed5ff8 CR3: 0000000116b16000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 flush_tlb_mm_range+0x8ff/0x1090
 tlb_flush_mmu+0x1af/0xa30
 tlb_finish_mmu+0xf4/0x220
 free_ldt_pgtables+0x192/0x360
 exit_mmap+0x1bf/0x9f0
 __mmput+0x118/0x420
 exit_mm+0x221/0x2d0
 do_exit+0x6cd/0x2360
 do_group_exit+0x22d/0x2f0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x18c6/0x18d0
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efc2179e159
Code: Unable to access opcode bytes at 0x7efc2179e12f.
RSP: 002b:00007ffc29e04658 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efc2179e159
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc29e046bc R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000006 R11: 0000000000000246 R12: 00000000000007d3
R13: 00000000000927c0 R14: 00000000000dafc4 R15: 00007ffc29e04710
 </TASK>
