Bug 595014 – Task Dump in wpa_supplicant

• Product: Gentoo Linux
• Status: UNCONFIRMED ---

[Description richard 2016-09-24 11:41:15 UTC]

wpa_supplicant appears to be delaying system startup. dmesg claims it has a problem. It sometimes happens multiple times during a startup. 

   36.710435] INFO: rcu_sched self-detected stall on CPU
[   36.710443] 	1-...: (21000 ticks this GP) idle=80d/140000000000001/0 softirq=4749/4752 fqs=7000 
[   36.710446] 	 (t=21001 jiffies g=2074 c=2073 q=1832)
[   36.710449] Task dump for CPU 1:
[   36.710452] wpa_supplicant  R  running task    13616  2707      1 0x00000008
[   36.710460]  ffffffff81c2d740 ffff88017fc83da8 ffffffff8109b9e2 0000000000000001
[   36.710464]  ffffffff81c2d740 ffff88017fc83dc0 ffffffff8109dd24 0000000000000002
[   36.710467]  ffff88017fc83df0 ffffffff810c8d66 ffff88017fc92e80 ffffffff81c2d740
[   36.710471] Call Trace:
[   36.710473]  <IRQ>  [<ffffffff8109b9e2>] sched_show_task+0xc2/0x120
[   36.710484]  [<ffffffff8109dd24>] dump_cpu_task+0x34/0x40
[   36.710488]  [<ffffffff810c8d66>] rcu_dump_cpu_stacks+0x86/0xc0
[   36.710492]  [<ffffffff810cc745>] rcu_check_callbacks+0x4b5/0x7a0
[   36.710496]  [<ffffffff8110c747>] ? acct_account_cputime+0x17/0x20
[   36.710501]  [<ffffffff810e03b0>] ? tick_sched_do_timer+0x30/0x30
[   36.710505]  [<ffffffff810d1654>] update_process_times+0x34/0x60
[   36.710508]  [<ffffffff810dfe51>] tick_sched_handle.isra.15+0x31/0x40
[   36.710511]  [<ffffffff810e03e8>] tick_sched_timer+0x38/0x70
[   36.710514]  [<ffffffff810d2280>] __hrtimer_run_queues+0xf0/0x260
[   36.710517]  [<ffffffff810d26c3>] hrtimer_interrupt+0xa3/0x1a0
[   36.710522]  [<ffffffff81034b23>] local_apic_timer_interrupt+0x33/0x60
[   36.710525]  [<ffffffff81035578>] smp_apic_timer_interrupt+0x38/0x50
[   36.710530]  [<ffffffff8185fd51>] apic_timer_interrupt+0x81/0x90
[   36.710531]  <EOI>  [<ffffffff8134d64e>] ? delay_tsc+0x1e/0x50
[   36.710539]  [<ffffffff8134d5c7>] __const_udelay+0x27/0x30
[   36.710544]  [<ffffffff8159dd2e>] rtl8723_fw_free_to_go+0xae/0x100
[   36.710547]  [<ffffffff8159e046>] rtl8723_download_fw+0xb6/0x130
[   36.710550]  [<ffffffff8158fecc>] rtl8723be_hw_init+0xc9c/0x1790
[   36.710554]  [<ffffffff81583889>] rtl_ps_enable_nic+0x29/0x70
[   36.710558]  [<ffffffff8159585e>] rtl8723be_phy_set_rf_power_state+0x34e/0x390
[   36.710561]  [<ffffffff81583b60>] rtl_ps_set_rf_state+0x120/0x170
[   36.710564]  [<ffffffff81583be8>] _rtl_ps_inactive_ps+0x38/0xb0
[   36.710567]  [<ffffffff81583ce2>] rtl_ips_nic_on+0x82/0xb0
[   36.710571]  [<ffffffff8158158d>] rtl_op_config+0x1fd/0x400
[   36.710576]  [<ffffffff817fc708>] ieee80211_hw_config+0x68/0x350
[   36.710580]  [<ffffffff818106ad>] ieee80211_recalc_idle+0x1d/0x20
[   36.710583]  [<ffffffff818060be>] __ieee80211_start_scan+0x22e/0x6f0
[   36.710586]  [<ffffffff8180739b>] ieee80211_request_scan+0x2b/0x50
[   36.710590]  [<ffffffff81815c33>] ieee80211_scan+0x63/0xa0
[   36.710594]  [<ffffffff817d90db>] nl80211_trigger_scan+0x60b/0x6a0
[   36.710599]  [<ffffffff816b8145>] genl_family_rcv_msg+0x185/0x340
[   36.710602]  [<ffffffff816b8300>] ? genl_family_rcv_msg+0x340/0x340
[   36.710605]  [<ffffffff816b8370>] genl_rcv_msg+0x70/0xb0
[   36.710608]  [<ffffffff816b7932>] netlink_rcv_skb+0x92/0xb0
[   36.710611]  [<ffffffff816b7fa3>] genl_rcv+0x23/0x40
[   36.710614]  [<ffffffff816b7357>] netlink_unicast+0x157/0x200
[   36.710617]  [<ffffffff816b76f3>] netlink_sendmsg+0x2f3/0x370
[   36.710621]  [<ffffffff81676480>] sock_sendmsg+0x30/0x40
[   36.710625]  [<ffffffff81677039>] ___sys_sendmsg+0x289/0x320
[   36.710629]  [<ffffffff81159e6a>] ? __inc_zone_page_state+0x2a/0x30
[   36.710633]  [<ffffffff81172635>] ? page_add_file_rmap+0x15/0x20
[   36.710637]  [<ffffffff8116740e>] ? do_set_pte+0x7e/0xc0
[   36.710641]  [<ffffffff8113e59f>] ? unlock_page+0x5f/0x70
[   36.710644]  [<ffffffff8113eac5>] ? filemap_map_pages+0x215/0x220
[   36.710648]  [<ffffffff81168ba2>] ? handle_mm_fault+0xc62/0xff0
[   36.710651]  [<ffffffff816778fd>] __sys_sendmsg+0x3d/0x70
[   36.710655]  [<ffffffff81677939>] SyS_sendmsg+0x9/0x10
[   36.710658]  [<ffffffff8185f01b>] entry_SYSCALL_64_fastpath+0x12/0x6e