rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13756/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=81465, q=305 ncpus=2)
task:udevd           state:R  running task     stack:24856 pid:13756 tgid:13756 ppid:5062   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_is_held_type+0x106/0x150
Code: 19 00 00 b8 ff ff ff ff 65 0f c1 05 74 bd 90 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc90005977768 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffff888107398000 RSI: ffffffff8e2198a3 RDI: ffffffff8c28ae60
RBP: 00000000ffffffff R08: ffffffff826ff57c R09: ffffffff8e95cd60
R10: dffffc0000000000 R11: ffffed1020256925 R12: 0000000000000246
R13: ffff888107398000 R14: ffffffff8e95cd60 R15: 0000000000000001
 kernfs_root+0xf6/0x230
 kernfs_dop_revalidate+0x228/0x650
 lookup_fast+0x253/0x5b0
 link_path_walk+0x720/0x18d0
 path_openat+0x2c3/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea4d77d9a4
RSP: 002b:00007ffe0333c0d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055651e66a470 RCX: 00007fea4d77d9a4
RDX: 0000000000080000 RSI: 000055651e65d350 RDI: 00000000ffffff9c
RBP: 000055651e65d350 R08: 000055651e65d350 R09: 0000000000000040
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 0000000000000707 R14: 0000000000000000 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g81465 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=24317
rcu: rcu_preempt kthread starved for 10502 jiffies! g81465 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27640 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5595 Comm: sshd 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_const_cmp4+0x10/0x90
Code: 09 cc 0f 1f 84 00 00 00 00 00 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 15 48 6c 73 11 <65> 8b 0d 69 6c 73 11 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75
RSP: 0018:ffffc90000007d08 EFLAGS: 00000046
RAX: ffffffff89b85f07 RBX: ffff888111fc1000 RCX: 0000000080010201
RDX: ffff88810b959d80 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f90 R12: ffff88810b95a8f8
R13: ffff88811351d000 R14: ffff88811351d300 R15: dffffc0000000000
FS:  00007f90c8cd4800(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa6de7ada40 CR3: 000000010952e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 advance_sched+0x157/0xc20
 __hrtimer_run_queues+0x3c0/0xa20
 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:unwind_next_frame+0x188/0x2550
Code: ef 19 00 00 49 8d 5e 35 48 89 d8 48 c1 e8 03 48 89 44 24 38 0f b6 04 28 84 c0 0f 85 9c 1c 00 00 4c 89 6c 24 20 4c 89 7c 24 50 <48> 89 5c 24 18 0f b6 1b 48 8b 44 24 30 80 3c 28 00 4c 8b 7c 24 10
RSP: 0018:ffffc9000470f098 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000470f19d RCX: 0000000080000201
RDX: 00000000b766d63e RSI: ffffffff8c28ae40 RDI: ffffffff8c28ae00
RBP: dffffc0000000000 R08: ffffffff8176f256 R09: ffffffff8e95cd60
R10: ffffc9000470f1b8 R11: ffffffff81b0e910 R12: ffffc9000470f1a0
R13: 1ffff920008e1e2d R14: ffffc9000470f168 R15: ffffffff8176f256
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_mempool_poison_object+0x178/0x1e0
 napi_skb_cache_put+0x7b/0x6f0
 skb_attempt_defer_free+0x55f/0x770
 tcp_recvmsg_locked+0x2479/0x3720
 tcp_recvmsg+0x205/0x7e0
 sock_recvmsg+0x155/0x1b0
 sock_read_iter+0x251/0x320
 vfs_read+0x582/0xa70
 ksys_read+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f90c8916b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd406e6b48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007f90c8916b6a
RDX: 0000000000040000 RSI: 000055b8c2ed5dd0 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd406e6bb0 R14: 000055b8c2d7ff60 R15: 00007ffd406e6c28
 </TASK>
hpet: Lost 27 RTC interrupts
