rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=d384/1/0x4000000000000000 softirq=82216/82217 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=94201, q=399 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 17157 Comm: syz.7.4202 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:_raw_spin_unlock_irqrestore+0x31/0x80
Code: 48 89 f3 49 89 fe 48 83 c7 18 48 8b 74 24 10 e8 d5 fd f6 f5 4c 89 f7 e8 dd 72 f7 f5 f7 c3 00 02 00 00 74 05 e8 40 fe 22 f6 9c <58> a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00
RSP: 0018:ffffc90000a08db8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000046 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88823c628280
RBP: ffff888174fd5300 R08: ffff88823c628283 R09: 1ffff110478c5050
R10: dffffc0000000000 R11: ffffed10478c5051 R12: ffff88823c628280
R13: 1ffff110478c507a R14: ffff88823c628280 R15: ffffffff89b847a0
FS:  00007f61822906c0(0000) GS:ffff8882a9291000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bb7833c00 CR3: 000000011074e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x2c3/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 dd 72 f7 f5 f7 c3 00 02 00 00 74 05 e8 40 fe 22 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 24 f5 e8 f5 65 8b 05 ad 1e 8e 07 85 c0 74 18 5b 41 5e e9 51 48
RSP: 0018:ffffc9000afefa38 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa884e RDI: 0000000000000001
RBP: ffff8881687f8000 R08: ffffffff9030b2f7 R09: 1ffffffff206165e
R10: dffffc0000000000 R11: fffffbfff206165f R12: 000000000004ab30
R13: dffffc0000000000 R14: ffffffff8ea5fa20 R15: 0000000000001988
 pcpu_alloc_noprof+0xb7e/0x19c0
 bpf_map_alloc_percpu+0x65/0x180
 prealloc_init+0x217/0x640
 htab_map_alloc+0x69e/0xc90
 map_create+0xafd/0x16a0
 __sys_bpf+0x6e1/0x950
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f618139cdd9
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:00007f6182290028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6181615fa0 RCX: 00007f618139cdd9
RDX: 0000000000000050 RSI: 0000200000000600 RDI: 0000000000000000
RBP: 00007f6181432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6181616038 R14: 00007f6181615fa0 R15: 00007ffcd9f01db8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g94201 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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 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: 17161 Comm: syz.4.4203 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:__sanitizer_cov_trace_pc+0x3b/0x70
Code: 8b 15 d9 4b 73 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 cc 16 00 00 00 74 2c 8b 91 a8 16 00 00 83 fa 02 75 21 <48> 8b 91 b0 16 00 00 48 8b 32 48 8d 7e 01 8b 89 ac 16 00 00 48 39
RSP: 0018:ffffc9000ace7978 EFLAGS: 00000246
RAX: ffffffff81b9abb6 RBX: ffff88812103c2c8 RCX: ffff8881072d9d80
RDX: 0000000000000002 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000ace7ab0 R08: ffffffff9030b2f7 R09: 1ffffffff206165e
R10: dffffc0000000000 R11: ffffffff81745300 R12: 1ffff110478c8199
R13: dffffc0000000000 R14: ffff88823c640cc8 R15: 0000000000000001
FS:  00007f2bb86126c0(0000) GS:ffff88818dc91000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bb784f0d1 CR3: 00000001138ca000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 smp_call_function_many_cond+0xfe6/0x13d0
 clock_was_set+0x70a/0x7d0
 do_adjtimex+0x25d/0x370
 __x64_sys_clock_adjtime+0x252/0x340
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2bb779cdd9
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:00007f2bb8612028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f2bb7a15fa0 RCX: 00007f2bb779cdd9
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000000
RBP: 00007f2bb7832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2bb7a16038 R14: 00007f2bb7a15fa0 R15: 00007fff0cf87cd8
 </TASK>
