rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=255c/1/0x4000000000000000 softirq=50717/50718 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=60053, q=219 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12062 Comm: syz.7.2284 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:__hrtimer_run_queues+0x2c9/0xa10
Code: 03 42 80 3c 28 00 74 08 48 89 df e8 81 f3 80 00 4c 8b 2b 4c 89 e7 48 8b 74 24 78 e8 71 6d 1f 0a 0f 1f 44 00 00 e8 b7 61 13 00 <65> 8b 1d 64 50 b9 11 bf 07 00 00 00 89 de e8 e4 65 13 00 83 fb 07
RSP: 0018:ffffc90000007dd8 EFLAGS: 00000006
RAX: ffffffff81b39fc9 RBX: ffff888112265348 RCX: ffff888110270000
RDX: 0000000000010000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffff888112265300 R08: ffff8881210281c3 R09: 1ffff11024205038
R10: dffffc0000000000 R11: ffffed1024205039 R12: ffff8881210281c0
R13: ffffffff89ddaed0 R14: ffff888121028360 R15: 1ffff11024205062
FS:  00007fc002e656c0(0000) GS:ffff88818d951000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d91bff8 CR3: 000000016cbf0000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x448/0x910
 __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+0x221/0x350
Code: ff ff ff e8 61 9f 2d 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b 3a ca 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 38 60 b8
RSP: 0018:ffffc9000aa97280 EFLAGS: 00000282
RAX: 66e3ec7a326e7600 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8e4b1894 RDI: ffffffff8c4bda80
RBP: ffffffff8177827f R08: ffffffff8177827f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: 0000000000000002
R13: ffffffff8eb59c60 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_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 skb_release_data+0x85e/0xab0
 __kfree_skb+0x5d/0x210
 netlink_unicast+0x7c3/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1b1/0x290
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc001f9de99
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:00007fc002e65028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc002225fa0 RCX: 00007fc001f9de99
RDX: 0000000000000080 RSI: 00002000000005c0 RDI: 0000000000000003
RBP: 00007fc002033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc002226038 R14: 00007fc002225fa0 R15: 00007ffe21b7ff68
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g60053 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:27560 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: 1 UID: 0 PID: 12059 Comm: syz.6.2283 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+0x10b0/0x14b0
Code: c0 75 73 41 8b 1e 89 de 83 e6 01 31 ff e8 d8 22 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 84 1e 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 69 1e 0c
RSP: 0018:ffffc90006ba7980 EFLAGS: 00000246
RAX: ffffffff81bae317 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000951c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90006ba7ab0 R08: ffffffff90578737 R09: 1ffffffff20af0e6
R10: dffffc0000000000 R11: ffffffff8174f150 R12: 1ffff110242085fd
R13: ffff88823c63c448 R14: ffff888121042fe8 R15: 0000000000000000
FS:  00007f2ae9da76c0(0000) GS:ffff8882a8f51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32a19ff8 CR3: 00000001bd146000 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: 0033:0x7f2ae8f9de99
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:00007f2ae9da7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f2ae9225fa0 RCX: 00007f2ae8f9de99
RDX: 0000000000000000 RSI: 0000200000000380 RDI: 0000000000000000
RBP: 00007f2ae9033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ae9226038 R14: 00007f2ae9225fa0 R15: 00007fff9a98b158
 </TASK>
