syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6841
rcu: 	(detected by 1, t=10502 jiffies, g=15065, q=1878 ncpus=2)
task:syz.3.434       state:R  running task     stack:26120 pid:6841  ppid:5785   flags:0x0000400e
Call Trace:
 <IRQ>
 sched_show_task+0x481/0x5a0 kernel/sched/core.c:9179
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
 print_other_cpu_stall+0xfa7/0x1340 kernel/rcu/tree_stall.h:637
 check_cpu_stall kernel/rcu/tree_stall.h:809 [inline]
 rcu_pending kernel/rcu/tree.c:3950 [inline]
 rcu_sched_clock_irq+0x87c/0x1220 kernel/rcu/tree.c:2295
 update_process_times+0x147/0x1b0 kernel/time/timer.c:2071
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x3a2/0x580 kernel/time/tick-sched.c:1492
 __run_hrtimer kernel/time/hrtimer.c:1755 [inline]
 __hrtimer_run_queues+0x4df/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:queue_work_on+0x187/0x1e0 kernel/workqueue.c:1840
Code: 4d 85 e4 75 16 e8 89 36 2f 00 eb 15 e8 82 36 2f 00 e8 5d b8 16 09 4d 85 e4 74 ea e8 73 36 2f 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 44 05 00 00 00 00 00 66 41 c7
RSP: 0018:ffffc900001f03a0 EFLAGS: 00000246
RAX: ffffffff81565fbd RBX: 0000000000000000 RCX: ffff88802fd38000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001f0480 R08: ffffffff90da2617 R09: 1ffffffff21b44c2
R10: dffffc0000000000 R11: fffffbfff21b44c3 R12: 0000000000000200
R13: 1ffff9200003e078 R14: 0000000000000000 R15: ffff88807e0e8001
 __ieee80211_queue_skb_to_iface net/mac80211/rx.c:232 [inline]
 ieee80211_queue_skb_to_iface net/mac80211/rx.c:243 [inline]
 ieee80211_rx_h_mgmt+0x4f8/0x6f0 net/mac80211/rx.c:3989
 ieee80211_rx_handlers+0x64f0/0xb0c0 net/mac80211/rx.c:4147
 ieee80211_invoke_rx_handlers net/mac80211/rx.c:4177 [inline]
 ieee80211_prepare_and_rx_handle+0x25fe/0x61d0 net/mac80211/rx.c:5029
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5271 [inline]
 ieee80211_rx_list+0x2644/0x2f10 net/mac80211/rx.c:5406
 ieee80211_rx_napi+0x1aa/0x3c0 net/mac80211/rx.c:5429
 ieee80211_rx include/net/mac80211.h:4969 [inline]
 ieee80211_handle_queued_frames+0x106/0x1a0 net/mac80211/main.c:319
 tasklet_action_common+0x2eb/0x4c0 kernel/softirq.c:809
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 19 4e 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90004237c00 EFLAGS: 00000206
RAX: 3993e107b5f0b100 RBX: 1ffff92000846f88 RCX: 3993e107b5f0b100
RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: ffffffff8afc6680
RBP: ffffc90004237cf0 R08: ffffffff90da2537 R09: 1ffffffff21b44a6
R10: dffffc0000000000 R11: fffffbfff21b44a7 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8cd354d8
 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock+0x85/0xa0 include/linux/rcupdate.h:818
 dput+0xe6/0x1e0 fs/dcache.c:911
 __fput+0x5e5/0x970 fs/file_table.c:392
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fdd6398e9a9
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:00007ffd0437c268 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fdd63bb7ba0 RCX: 00007fdd6398e9a9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fdd63bb7ba0 R08: 0000000000001518 R09: 0000000f0437c55f
R10: 00000000003fe8c4 R11: 0000000000000246 R12: 000000000001d1ce
R13: 00007fdd63bb6080 R14: ffffffffffffffff R15: 00007ffd0437c380
 </TASK>