rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P19485
rcu: 	(detected by 1, t=10502 jiffies, g=213037, q=24 ncpus=2)
task:syz.0.11778     state:R  running task     stack:26000 pid:19485 tgid:19484 ppid:5598   task_flags:0x400140 flags:0x00080010
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10506 jiffies! g213037 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=92669
rcu: rcu_preempt kthread starved for 10507 jiffies! g213037 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d4/0x5820
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x38b/0x480
 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: 19488 Comm: syz.0.11778 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+0x49/0x80
Code: 29 89 d6 81 e6 00 01 00 0f 81 fe 00 01 00 00 40 0f 95 c6 81 fa 00 00 00 10 0f 93 c2 40 08 f2 75 35 83 b9 3c 17 00 00 00 74 2c <8b> 91 10 17 00 00 83 fa 02 75 21 48 8b 91 18 17 00 00 48 8b 32 48
RSP: 0018:ffffc900083473b0 EFLAGS: 00000246
RAX: ffffffff89d6c711 RBX: ffff88818604de70 RCX: ffff88816b3f5a00
RDX: 0000000000000201 RSI: ffff88818604c600 RDI: ffff88816926c900
RBP: ffff88818604de38 R08: ffff888178234290 R09: 00000000fff10000
R10: ffff888178234290 R11: 00000000fff10000 R12: ffff88818604de60
R13: ffff88818604de0c R14: dffffc0000000000 R15: ffff88816926c900
FS:  00007fb2ef2e96c0(0000) GS:ffff8882a8cdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 00000001a4846000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 tcf_action_exec+0x31/0x8d0
 basic_classify+0x1b2/0x2d0
 tcf_classify+0x6e3/0x1160
 hfsc_enqueue+0x322/0xf80
 dev_qdisc_enqueue+0x4e/0x260
 __dev_queue_xmit+0x1b45/0x3820
 packet_sendmsg+0x3d0d/0x4f80
 sock_sendmsg_nosec+0x13a/0x180
 __sys_sendto+0x408/0x5a0
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb2ee39e159
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:00007fb2ef2e9028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fb2ee626090 RCX: 00007fb2ee39e159
RDX: 000000000000fdef RSI: 00002000000002c0 RDI: 0000000000000009
RBP: 00007fb2ee435024 R08: 0000200000000140 R09: 0000000000000014
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb2ee626128 R14: 00007fb2ee626090 R15: 00007fff5bdfeaa8
 </TASK>
