rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=8a4c/1/0x4000000000000000 softirq=348155/348157 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=418297, q=358 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30453 Comm: syz-executor 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:lock_is_held_type+0x27/0x150
Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 bb ff ff ff ff 83 3d f6 69 88 04 00 0f 84 e4 00 00 00 65 8b 05 b9 ad 90 07 <85> c0 0f 85 d5 00 00 00 65 4c 8b 2d 01 68 90 07 41 83 bd 8c 0b 00
RSP: 0018:ffffc90000a08da0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000010000
RDX: ffff888112da0000 RSI: 00000000ffffffff RDI: ffff88823c628298
RBP: ffff88816e9a2300 R08: ffff88816e9a2317 R09: 0000000000000000
R10: ffff88816e9a2308 R11: ffffed102dd34463 R12: ffff88823c628280
R13: ffff88823c628510 R14: ffff88823c628520 R15: dffffc0000000000
FS:  000055556e185500(0000) GS:ffff8882a9299000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46e8c4f156 CR3: 000000011f178000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x20c/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:__sanitizer_cov_trace_pc+0x8/0x70
Code: 8b 3d b4 a7 60 0c 48 89 de 5b e9 33 39 60 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 98 b7 72 11 65 8b 15 b9 b7 72 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90007f372f8 EFLAGS: 00000246
RAX: ffffffff8218e83c RBX: 0000000000000000 RCX: ffff888112da0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90007f37590 R08: ffffea000112be87 R09: 1ffffd40002257d0
R10: dffffc0000000000 R11: fffff940002257d1 R12: ffff88811f164aa0
R13: dffffc0000000000 R14: ffffea000112be88 R15: ffffea000112be80
 copy_pmd_range+0xe8c/0x5970
 copy_page_range+0xc13/0x1220
 dup_mmap+0xf4e/0x1da0
 copy_mm+0x13b/0x4a0
 copy_process+0x1f1c/0x4440
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fadd93c58d2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff59c786e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff59c786e0 RCX: 00007fadd93c58d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff59c7886c R08: 0000000000000000 R09: 0000000000000001
R10: 000055556e1857d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000002275c3 R15: 00007fff59c788c0
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g418297 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+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x389/0x470
 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: 12827 Comm: syz.2.29852 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+0xfcf/0x13d0
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 9a 07 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 45 03 0c 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 2a 03 0c
RSP: 0018:ffffc9000633fae0 EFLAGS: 00000246
RAX: ffffffff81b9b536 RBX: ffff88812103c308 RCX: 0000000000080000
RDX: ffffc9002263a000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000633fc10 R08: ffffffff90303ef7 R09: 1ffffffff20607de
R10: dffffc0000000000 R11: ffffffff81745300 R12: 1ffff110478c81a9
R13: dffffc0000000000 R14: ffff88823c640d48 R15: 0000000000000001
FS:  00007f46e6df66c0(0000) GS:ffff88818dc99000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46e8c4f156 CR3: 000000002052c000 CR4: 00000000000006f0
DR0: 0000000000000004 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 clock_was_set+0x70a/0x7d0
 do_settimeofday64+0x340/0x570
 __x64_sys_clock_settime+0x253/0x2a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46e8b9ce59
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:00007f46e6df6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f46e8e15fa0 RCX: 00007f46e8b9ce59
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f46e8c32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46e8e16038 R14: 00007f46e8e15fa0 R15: 00007ffef0193d08
 </TASK>
