rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=2104/1/0x4000000000000000 softirq=47284/47284 fqs=0
rcu: 	(t=10500 jiffies g=29877 q=94 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g29877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7946
rcu: rcu_preempt kthread starved for 10500 jiffies! g29877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27560 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
CPU: 0 UID: 0 PID: 11780 Comm: syz.2.2512 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kasan_check_range+0x1da/0x2c0
Code: 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 b8 00 00 00 49 ff c3 49 ff cc 75 ee 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 cc cc cc cc cc 45 84 ff 75 63 41 f7 c7 00 ff 00 00 75
RSP: 0018:ffffc90000007908 EFLAGS: 00000256
RAX: 0000000000000001 RBX: ffff88810d4598c0 RCX: ffffffff8b7cde5c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88810d4598c0
RBP: ffffc90000007a18 R08: ffff88810d4598c3 R09: 1ffff11021a8b318
R10: dffffc0000000000 R11: ffffed1021a8b319 R12: 1ffff92000000f2c
R13: 0000000000000001 R14: ffffc90000007980 R15: 1ffff11021a8b318
FS:  00007ff371cb46c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff371cb3fc8 CR3: 000000004115e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 native_queued_spin_lock_slowpath+0xbc/0x8e0
 queued_spin_lock_slowpath+0x43/0x50
 do_raw_spin_lock+0x21f/0x290
 xfrm_policy_kill+0x240/0x440
 xfrm_policy_timer+0x353/0x630
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_get_return_address+0x1d/0x90
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 4c 83 3b 00 74 3a 48 83 c3 48 49 89 df 49
RSP: 0018:ffffc90002ccf728 EFLAGS: 00000a02
RAX: 1ffff92000599ee9 RBX: ffffc90002ccf748 RCX: 94777d416dcbdf00
RDX: 0000000000000000 RSI: ffffffff8dba91de RDI: ffffc90002ccf748
RBP: ffffc90002ccf7d0 R08: ffffc90002ccfd70 R09: 0000000000000000
R10: ffffc90002ccf798 R11: fffff52000599ef5 R12: ffff888028ed0000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffc90002ccf748
 arch_stack_walk+0xfc/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 skb_release_data+0x62d/0x7c0
 sk_skb_reason_drop+0x127/0x170
 skb_queue_purge_reason+0x2c8/0x360
 unix_dgram_connect+0x773/0xc20
 __sys_connect+0x316/0x440
 __x64_sys_connect+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff370d8ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff371cb4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007ff370fd6180 RCX: 00007ff370d8ec29
RDX: 000000000000006e RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007ff370e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff370fd6218 R14: 00007ff370fd6180 R15: 00007ffe8b306348
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11778 Comm: syz.0.2513 Not tainted syzkaller #0 PREEMPT(full) 
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+0x8/0x70
Code: 8b 3d f4 65 fe 0b 48 89 de 5b e9 23 a1 58 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 0c 25 08 b0 a0 92 65 8b 15 18 f1 e0 10 81 e2 00 01 ff 00
RSP: 0018:ffffc900028ff0d8 EFLAGS: 00000207
RAX: ffffffff8a2246d2 RBX: 0000000003000000 RCX: 0000000000000002
RDX: ffff888106c71cc0 RSI: 00000000ae120100 RDI: 0000000003000000
RBP: ffffc900028ff230 R08: 0000000000000000 R09: ffffffff8a2244c0
R10: dffffc0000000000 R11: fffff5200051fe0c R12: dffffc0000000000
R13: ffff888110be1b00 R14: 00000000ae120100 R15: ffffc900028ff6a0
FS:  00007f58d5e566c0(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f58d5e55fc8 CR3: 000000010e4a8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 xfrm_alloc_spi+0x4b2/0xf30
 xfrm_alloc_userspi+0x70b/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f58d4f8ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f58d5e56038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f58d51d6090 RCX: 00007f58d4f8ec29
RDX: 0000000000004000 RSI: 0000200000000340 RDI: 0000000000000003
RBP: 00007f58d5011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58d51d6128 R14: 00007f58d51d6090 R15: 00007ffe34c495d8
 </TASK>
sched: DL replenish lagged too much
