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Re: Lockdep warning in iwl_pcie_rx_handle()

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On Mon, 1 Mar 2021, Jiri Kosina wrote:

> I am getting the splat below with Linus' tree as of today (5.11-rc1, 
> fe07bfda2fb). I haven't started to look into the code yet, but apparently 
> this has been already reported by Heiner here:
> 
> 	https://www.spinics.net/lists/linux-wireless/msg208353.html
> 
> so before I start digging deep into it (the previous kernel this 
> particular machine had is 5.9, so I'd rather avoid lenghty bisect for now 
> in case someone has already looked into it and has ideas where the problem 
> is), I thought I'd ask whether this has been root-caused elsewhere 
> already.
> 
> Thanks.

After reverting 25edc8f259c7106 ("iwlwifi: pcie: properly implement 
NAPI"), I don't see the lockdep warning any more (*), so it seems to be 
culprit (or at least related). CCing Johannes.

Leaving the original mail below for reference.

(*) I see the warning below instead; but let's focus on fixing the lockdep 
    reported issue in the first place, I guess. It might be that I'd need 
    to revert more things in order to get to a fully consistent state.

[   23.488194] WARNING: CPU: 1 PID: 1139 at kernel/softirq.c:178 __local_bh_enable_ip+0xa5/0xf0
[   23.488203] Modules linked in: tun ip6table_mangle ip6table_filter ip6_tables iptable_mangle xt_DSCP xt_tcpudp xt_conntrack nf_conntrack nf_defrag_ipv6 libcrc32c nf_defrag_ipv4 iptable_filter ip_tables x_tables algif_skcipher af_alg bnep dm_crypt hid_generic snd_usb_audio snd_usbmidi_lib snd_rawmidi uvcvideo videobuf2_vmalloc btusb videobuf2_memops btrtl btbcm videobuf2_v4l2 btintel videodev videobuf2_common bluetooth ecdh_generic ecc iwlmvm mac80211 snd_hda_codec_hdmi libarc4 intel_rapl_msr snd_hda_codec_realtek snd_soc_skl iTCO_wdt iTCO_vendor_support snd_soc_sst_ipc snd_hda_codec_generic snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi wmi_bmof snd_soc_core intel_rapl_common x86_pkg_temp_thermal usbhid intel_powerclamp snd_compress coretemp snd_hda_intel snd_intel_dspcfg kvm_intel snd_hda_codec iwlwifi snd_hwdep e1000e kvm snd_hda_core ptp irqbypass joydev pcspkr snd_pcm i2c_i801 pps_core cfg80211 i2c_smbus snd_timer mei_me mei thermal intel_pch_thermal
[   23.488334]  thinkpad_acpi wmi battery ledtrig_audio platform_profile snd ac soundcore rfkill tpm_crb tpm_tis tpm_tis_core tpm acpi_pad button nls_iso8859_1 nls_cp437 vfat fat dm_mod fuse rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel crypto_simd cryptd i915 i2c_algo_bit drm_kms_helper syscopyarea xhci_pci serio_raw sysfillrect sysimgblt fb_sys_fops xhci_hcd rtsx_pci usbcore drm video sg msr efivarfs
[   23.488404] CPU: 1 PID: 1139 Comm: NetworkManager Not tainted 5.12.0-rc1-00004-gb4ded168af79 #7
[   23.488408] Hardware name: LENOVO 20K5S22R00/20K5S22R00, BIOS R0IET38W (1.16 ) 05/31/2017
[   23.488411] RIP: 0010:__local_bh_enable_ip+0xa5/0xf0
[   23.488416] Code: f7 69 e8 ee 23 14 00 fb 66 0f 1f 44 00 00 65 8b 05 f0 f4 f7 69 85 c0 74 3f 48 83 c4 08 5b c3 65 8b 05 9b fe f7 69 85 c0 75 8e <0f> 0b eb 8a 48 89 3c 24 e8 4e 20 14 00 48 8b 3c 24 eb 91 e8 13 4e
[   23.488420] RSP: 0018:ffffafd580b13298 EFLAGS: 00010046
[   23.488424] RAX: 0000000000000000 RBX: 0000000000000201 RCX: 0000000000000000
[   23.488426] RDX: 0000000000000003 RSI: 0000000000000201 RDI: ffffffffc1272389
[   23.488429] RBP: ffff96517ae4c018 R08: 0000000000000001 R09: 0000000000000000
[   23.488431] R10: ffffafd580b13178 R11: 0000000000000001 R12: ffff96517b060000
[   23.488433] R13: 0000000000000000 R14: ffffffff80000000 R15: 0000000000000001
[   23.488436] FS:  00007fc604ebefc0(0000) GS:ffff965267480000(0000) knlGS:0000000000000000
[   23.488439] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   23.488442] CR2: 000055fb3fef13b2 CR3: 0000000109112004 CR4: 00000000003706e0
[   23.488444] Call Trace:
[   23.488447]  ? _raw_spin_unlock_bh+0x1f/0x30
[   23.488453]  iwl_pcie_enqueue_hcmd+0x5d9/0xa00 [iwlwifi]
[   23.488499]  iwl_trans_txq_send_hcmd+0x6c/0x430 [iwlwifi]
[   23.488536]  iwl_trans_send_cmd+0x88/0x170 [iwlwifi]
[   23.488556]  ? lock_acquire+0x277/0x3d0
[   23.488564]  iwl_mvm_send_cmd+0x32/0x80 [iwlmvm]
[   23.488593]  iwl_mvm_led_set+0xc2/0xe0 [iwlmvm]
[   23.488629]  ? led_trigger_event+0x46/0x70
[   23.488633]  led_trigger_event+0x46/0x70
[   23.488643]  ieee80211_do_open+0x5c5/0xa20 [mac80211]
[   23.488719]  ieee80211_open+0x67/0x90 [mac80211]
[   23.488777]  __dev_open+0xd4/0x150
[   23.488790]  __dev_change_flags+0x19e/0x1f0
[   23.488805]  dev_change_flags+0x23/0x60
[   23.488813]  do_setlink+0x30d/0x1230
[   23.488829]  ? lock_is_held_type+0xb4/0x120
[   23.488841]  ? __nla_validate_parse.part.7+0x57/0xcb0
[   23.488855]  ? __lock_acquire+0x2e1/0x1a50
[   23.488870]  __rtnl_newlink+0x560/0x910
[   23.488890]  ? __lock_acquire+0x2e1/0x1a50
[   23.488893]  ? __lock_acquire+0x2e1/0x1a50
[   23.488915]  ? lock_acquire+0x277/0x3d0
[   23.488919]  ? sock_def_readable+0x5/0x290
[   23.488923]  ? lock_is_held_type+0xb4/0x120
[   23.488931]  ? find_held_lock+0x2d/0x90
[   23.488938]  ? sock_def_readable+0xb3/0x290
[   23.488944]  ? lock_release+0x166/0x2a0
[   23.489017]  ? lock_is_held_type+0x90/0x120
[   23.489037]  rtnl_newlink+0x47/0x70
[   23.489047]  rtnetlink_rcv_msg+0x25c/0x470
[   23.489057]  ? netlink_deliver_tap+0x97/0x3e0
[   23.489063]  ? validate_linkmsg+0x350/0x350
[   23.489072]  netlink_rcv_skb+0x50/0x100
[   23.489089]  netlink_unicast+0x1b2/0x280
[   23.489100]  netlink_sendmsg+0x336/0x450
[   23.489120]  sock_sendmsg+0x5b/0x60
[   23.489127]  ____sys_sendmsg+0x1ed/0x250
[   23.489131]  ? copy_msghdr_from_user+0x5c/0x90
[   23.489149]  ___sys_sendmsg+0x88/0xd0
[   23.489165]  ? lock_is_held_type+0xb4/0x120
[   23.489172]  ? find_held_lock+0x2d/0x90
[   23.489182]  ? lock_release+0x166/0x2a0
[   23.489194]  ? __fget_files+0xfe/0x1d0
[   23.489209]  ? __sys_sendmsg+0x5e/0xa0
[   23.489212]  __sys_sendmsg+0x5e/0xa0
[   23.489226]  ? lockdep_hardirqs_on_prepare+0xd9/0x170
[   23.489237]  do_syscall_64+0x33/0x80
[   23.489243]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   23.489247] RIP: 0033:0x7fc605c9572d
[   23.489251] Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 da ee ff ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 2e ef ff ff 48
[   23.489255] RSP: 002b:00007fffc83789f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
[   23.489259] RAX: ffffffffffffffda RBX: 000055ef468570c0 RCX: 00007fc605c9572d
[   23.489261] RDX: 0000000000000000 RSI: 00007fffc8378a30 RDI: 000000000000000c
[   23.489263] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
[   23.489265] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
[   23.489267] R13: 00007fffc8378b80 R14: 00007fffc8378b7c R15: 0000000000000000
[   23.489295] irq event stamp: 170785
[   23.489297] hardirqs last  enabled at (170783): [<ffffffff9609a8c2>] __local_bh_enable_ip+0x82/0xf0
[   23.489303] hardirqs last disabled at (170784): [<ffffffff96a8613d>] _raw_read_lock_irqsave+0x8d/0x90
[   23.489307] softirqs last  enabled at (170782): [<ffffffffc1272389>] iwl_pcie_enqueue_hcmd+0x5d9/0xa00 [iwlwifi]
[   23.489328] softirqs last disabled at (170785): [<ffffffffc1271ec6>] iwl_pcie_enqueue_hcmd+0x116/0xa00 [iwlwifi]


> 
> 
> 
> 
> [    9.970414] ========================================================
> [    9.973157] WARNING: possible irq lock inversion dependency detected
> [    9.976186] 5.12.0-rc1-00002-gbada49429032 #5 Not tainted
> [    9.979239] --------------------------------------------------------
> [    9.982223] irq/136-iwlwifi/565 just changed the state of lock:
> [    9.984904] ffff89f28433b0b0 (&rxq->lock){+.-.}-{2:2}, at: iwl_pcie_rx_handle+0x7f/0x960 [iwlwifi]
> [    9.987932] but this lock took another, SOFTIRQ-unsafe lock in the past:
> [    9.990980]  (napi_hash_lock){+.+.}-{2:2}
> [    9.990986] 
>                
>                and interrupts could create inverse lock ordering between them.
> 
> [   10.003955] 
>                other info that might help us debug this:
> [   10.008989]  Possible interrupt unsafe locking scenario:
> 
> [   10.013966]        CPU0                    CPU1
> [   10.016404]        ----                    ----
> [   10.018976]   lock(napi_hash_lock);
> [   10.021529]                                local_irq_disable();
> [   10.023985]                                lock(&rxq->lock);
> [   10.026340]                                lock(napi_hash_lock);
> [   10.028644]   <Interrupt>
> [   10.030934]     lock(&rxq->lock);
> [   10.033119] 
>                 *** DEADLOCK ***
> 
> [   10.039456] 1 lock held by irq/136-iwlwifi/565:
> [   10.041549]  #0: ffff89f2b1440170 (sync_cmd_lockdep_map){+.+.}-{0:0}, at: iwl_pcie_irq_handler+0x5/0xb30 [iwlwifi]
> [   10.043728] 
>                the shortest dependencies between 2nd lock and 1st lock:
> [   10.047836]  -> (napi_hash_lock){+.+.}-{2:2} {
> [   10.049845]     HARDIRQ-ON-W at:
> [   10.051860]                       lock_acquire+0x277/0x3d0
> [   10.053881]                       _raw_spin_lock+0x2c/0x40
> [   10.056170]                       netif_napi_add+0x14b/0x270
> [   10.058349]                       e1000_probe+0x2fe/0xee0 [e1000e]
> [   10.060539]                       local_pci_probe+0x42/0x90
> [   10.062609]                       pci_device_probe+0x10b/0x1c0
> [   10.064579]                       really_probe+0xef/0x4b0
> [   10.066578]                       driver_probe_device+0xde/0x150
> [   10.068765]                       device_driver_attach+0x4f/0x60
> [   10.070890]                       __driver_attach+0x9c/0x140
> [   10.073115]                       bus_for_each_dev+0x79/0xc0
> [   10.075304]                       bus_add_driver+0x18d/0x220
> [   10.077464]                       driver_register+0x5b/0xf0
> [   10.079615]                       do_one_initcall+0x5b/0x300
> [   10.081686]                       do_init_module+0x5b/0x21c
> [   10.083730]                       load_module+0x1dae/0x22c0
> [   10.085751]                       __do_sys_finit_module+0xad/0x110
> [   10.087799]                       do_syscall_64+0x33/0x80
> [   10.089758]                       entry_SYSCALL_64_after_hwframe+0x44/0xae
> [   10.091747]     SOFTIRQ-ON-W at:
> [   10.093634]                       lock_acquire+0x277/0x3d0
> [   10.095514]                       _raw_spin_lock+0x2c/0x40
> [   10.097353]                       netif_napi_add+0x14b/0x270
> [   10.099208]                       e1000_probe+0x2fe/0xee0 [e1000e]
> [   10.101032]                       local_pci_probe+0x42/0x90
> [   10.102835]                       pci_device_probe+0x10b/0x1c0
> [   10.104648]                       really_probe+0xef/0x4b0
> [   10.106439]                       driver_probe_device+0xde/0x150
> [   10.106443]                       device_driver_attach+0x4f/0x60
> [   10.106446]                       __driver_attach+0x9c/0x140
> [   10.111451]                       bus_for_each_dev+0x79/0xc0
> [   10.111454]                       bus_add_driver+0x18d/0x220
> [   10.111456]                       driver_register+0x5b/0xf0
> [   10.111459]                       do_one_initcall+0x5b/0x300
> [   10.111462]                       do_init_module+0x5b/0x21c
> [   10.111467]                       load_module+0x1dae/0x22c0
> [   10.111469]                       __do_sys_finit_module+0xad/0x110
> [   10.122761]                       do_syscall_64+0x33/0x80
> [   10.122768]                       entry_SYSCALL_64_after_hwframe+0x44/0xae
> [   10.122772]     INITIAL USE at:
> [   10.122775]                      lock_acquire+0x277/0x3d0
> [   10.128672]                      _raw_spin_lock+0x2c/0x40
> [   10.130160]                      netif_napi_add+0x14b/0x270
> [   10.131725]                      e1000_probe+0x2fe/0xee0 [e1000e]
> [   10.133268]                      local_pci_probe+0x42/0x90
> [   10.134783]                      pci_device_probe+0x10b/0x1c0
> [   10.136325]                      really_probe+0xef/0x4b0
> [   10.137864]                      driver_probe_device+0xde/0x150
> [   10.139394]                      device_driver_attach+0x4f/0x60
> [   10.140908]                      __driver_attach+0x9c/0x140
> [   10.142429]                      bus_for_each_dev+0x79/0xc0
> [   10.143947]                      bus_add_driver+0x18d/0x220
> [   10.145490]                      driver_register+0x5b/0xf0
> [   10.147024]                      do_one_initcall+0x5b/0x300
> [   10.148566]                      do_init_module+0x5b/0x21c
> [   10.150013]                      load_module+0x1dae/0x22c0
> [   10.151293]                      __do_sys_finit_module+0xad/0x110
> [   10.152571]                      do_syscall_64+0x33/0x80
> [   10.153740]                      entry_SYSCALL_64_after_hwframe+0x44/0xae
> [   10.154889]   }
> [   10.156023]   ... key      at: [<ffffffffae84ef38>] napi_hash_lock+0x18/0x40
> [   10.157191]   ... acquired at:
> [   10.158318]    _raw_spin_lock+0x2c/0x40
> [   10.159418]    netif_napi_add+0x14b/0x270
> [   10.160500]    _iwl_pcie_rx_init+0x1f4/0x710 [iwlwifi]
> [   10.161609]    iwl_pcie_rx_init+0x1b/0x3b0 [iwlwifi]
> [   10.162704]    iwl_trans_pcie_start_fw+0x2ac/0x6a0 [iwlwifi]
> [   10.163813]    iwl_mvm_load_ucode_wait_alive+0x116/0x460 [iwlmvm]
> [   10.164955]    iwl_run_init_mvm_ucode+0xa4/0x3a0 [iwlmvm]
> [   10.166079]    iwl_op_mode_mvm_start+0x9ed/0xbf0 [iwlmvm]
> [   10.167206]    _iwl_op_mode_start.isra.4+0x42/0x80 [iwlwifi]
> [   10.168326]    iwl_opmode_register+0x71/0xe0 [iwlwifi]
> [   10.169451]    iwl_mvm_init+0x34/0x1000 [iwlmvm]
> [   10.170585]    do_one_initcall+0x5b/0x300
> [   10.171699]    do_init_module+0x5b/0x21c
> [   10.172818]    load_module+0x1dae/0x22c0
> [   10.173933]    __do_sys_finit_module+0xad/0x110
> [   10.175048]    do_syscall_64+0x33/0x80
> [   10.176164]    entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> [   10.178421] -> (&rxq->lock){+.-.}-{2:2} {
> [   10.179564]    HARDIRQ-ON-W at:
> [   10.180709]                     lock_acquire+0x277/0x3d0
> [   10.181874]                     _raw_spin_lock_bh+0x34/0x40
> [   10.183049]                     _iwl_pcie_rx_init+0x130/0x710 [iwlwifi]
> [   10.184229]                     iwl_pcie_rx_init+0x1b/0x3b0 [iwlwifi]
> [   10.185397]                     iwl_trans_pcie_start_fw+0x2ac/0x6a0 [iwlwifi]
> [   10.186572]                     iwl_mvm_load_ucode_wait_alive+0x116/0x460 [iwlmvm]
> [   10.187759]                     iwl_run_init_mvm_ucode+0xa4/0x3a0 [iwlmvm]
> [   10.188950]                     iwl_op_mode_mvm_start+0x9ed/0xbf0 [iwlmvm]
> [   10.190132]                     _iwl_op_mode_start.isra.4+0x42/0x80 [iwlwifi]
> [   10.191312]                     iwl_opmode_register+0x71/0xe0 [iwlwifi]
> [   10.192497]                     iwl_mvm_init+0x34/0x1000 [iwlmvm]
> [   10.193685]                     do_one_initcall+0x5b/0x300
> [   10.194868]                     do_init_module+0x5b/0x21c
> [   10.196048]                     load_module+0x1dae/0x22c0
> [   10.197225]                     __do_sys_finit_module+0xad/0x110
> [   10.198409]                     do_syscall_64+0x33/0x80
> [   10.199601]                     entry_SYSCALL_64_after_hwframe+0x44/0xae
> [   10.200801]    IN-SOFTIRQ-W at:
> [   10.202000]                     lock_acquire+0x277/0x3d0
> [   10.203202]                     _raw_spin_lock+0x2c/0x40
> [   10.204412]                     iwl_pcie_rx_handle+0x7f/0x960 [iwlwifi]
> [   10.205653]                     iwl_pcie_napi_poll+0x2c/0x100 [iwlwifi]
> [   10.206879]                     __napi_poll+0x2d/0x220
> [   10.208075]                     net_rx_action+0x106/0x280
> [   10.209276]                     __do_softirq+0xd4/0x461
> [   10.210486]                     do_softirq+0x63/0xa0
> [   10.211677]                     __local_bh_enable_ip+0xd1/0xf0
> [   10.212879]                     iwl_pcie_irq_handler+0x67d/0xb30 [iwlwifi]
> [   10.214092]                     irq_thread_fn+0x21/0x60
> [   10.215298]                     irq_thread+0x107/0x1a0
> [   10.216491]                     kthread+0x13e/0x160
> [   10.217670]                     ret_from_fork+0x22/0x30
> [   10.218855]    INITIAL USE at:
> [   10.220030]                    lock_acquire+0x277/0x3d0
> [   10.221239]                    _raw_spin_lock_bh+0x34/0x40
> [   10.222438]                    _iwl_pcie_rx_init+0x130/0x710 [iwlwifi]
> [   10.223667]                    iwl_pcie_rx_init+0x1b/0x3b0 [iwlwifi]
> [   10.224894]                    iwl_trans_pcie_start_fw+0x2ac/0x6a0 [iwlwifi]
> [   10.226167]                    iwl_mvm_load_ucode_wait_alive+0x116/0x460 [iwlmvm]
> [   10.227448]                    iwl_run_init_mvm_ucode+0xa4/0x3a0 [iwlmvm]
> [   10.228718]                    iwl_op_mode_mvm_start+0x9ed/0xbf0 [iwlmvm]
> [   10.229977]                    _iwl_op_mode_start.isra.4+0x42/0x80 [iwlwifi]
> [   10.231236]                    iwl_opmode_register+0x71/0xe0 [iwlwifi]
> [   10.232492]                    iwl_mvm_init+0x34/0x1000 [iwlmvm]
> [   10.233758]                    do_one_initcall+0x5b/0x300
> [   10.235002]                    do_init_module+0x5b/0x21c
> [   10.236224]                    load_module+0x1dae/0x22c0
> [   10.237454]                    __do_sys_finit_module+0xad/0x110
> [   10.238679]                    do_syscall_64+0x33/0x80
> [   10.239906]                    entry_SYSCALL_64_after_hwframe+0x44/0xae
> [   10.241137]  }
> [   10.242327]  ... key      at: [<ffffffffc111f0c0>] __key.69825+0x0/0xfffffffffffe2f40 [iwlwifi]
> [   10.243587]  ... acquired at:
> [   10.244814]    __lock_acquire+0x27d/0x1a50
> [   10.246055]    lock_acquire+0x277/0x3d0
> [   10.247296]    _raw_spin_lock+0x2c/0x40
> [   10.248518]    iwl_pcie_rx_handle+0x7f/0x960 [iwlwifi]
> [   10.249789]    iwl_pcie_napi_poll+0x2c/0x100 [iwlwifi]
> [   10.251028]    __napi_poll+0x2d/0x220
> [   10.252254]    net_rx_action+0x106/0x280
> [   10.253484]    __do_softirq+0xd4/0x461
> [   10.254731]    do_softirq+0x63/0xa0
> [   10.255946]    __local_bh_enable_ip+0xd1/0xf0
> [   10.257157]    iwl_pcie_irq_handler+0x67d/0xb30 [iwlwifi]
> [   10.258382]    irq_thread_fn+0x21/0x60
> [   10.259608]    irq_thread+0x107/0x1a0
> [   10.260819]    kthread+0x13e/0x160
> [   10.262022]    ret_from_fork+0x22/0x30
> 
> [   10.264433] 
>                stack backtrace:
> [   10.266755] CPU: 2 PID: 565 Comm: irq/136-iwlwifi Not tainted 5.12.0-rc1-00002-gbada49429032 #5
> [   10.267964] Hardware name: LENOVO 20K5S22R00/20K5S22R00, BIOS R0IET38W (1.16 ) 05/31/2017
> [   10.269175] Call Trace:
> [   10.270376]  <IRQ>
> [   10.271566]  dump_stack+0x7f/0xa1
> [   10.272750]  mark_lock.part.49+0x8cb/0xc70
> [   10.273950]  ? __lock_acquire+0x2e1/0x1a50
> [   10.275164]  ? __lock_acquire+0x27d/0x1a50
> [   10.276372]  __lock_acquire+0x27d/0x1a50
> [   10.277562]  ? __lock_acquire+0x2e1/0x1a50
> [   10.278754]  ? __lock_acquire+0x2e1/0x1a50
> [   10.279937]  lock_acquire+0x277/0x3d0
> [   10.281110]  ? iwl_pcie_rx_handle+0x7f/0x960 [iwlwifi]
> [   10.282317]  ? lock_is_held_type+0xb4/0x120
> [   10.283483]  _raw_spin_lock+0x2c/0x40
> [   10.284637]  ? iwl_pcie_rx_handle+0x7f/0x960 [iwlwifi]
> [   10.285813]  iwl_pcie_rx_handle+0x7f/0x960 [iwlwifi]
> [   10.286985]  ? __lock_acquire+0x2e1/0x1a50
> [   10.288148]  ? try_to_wake_up+0x41c/0x600
> [   10.289323]  ? print_dl_rq+0xcc/0x160
> [   10.290490]  iwl_pcie_napi_poll+0x2c/0x100 [iwlwifi]
> [   10.291684]  __napi_poll+0x2d/0x220
> [   10.292862]  net_rx_action+0x106/0x280
> [   10.294034]  __do_softirq+0xd4/0x461
> [   10.295185]  do_softirq+0x63/0xa0
> [   10.296349]  </IRQ>
> [   10.297514]  __local_bh_enable_ip+0xd1/0xf0
> [   10.298683]  ? iwl_pcie_irq_handler+0x66c/0xb30 [iwlwifi]
> [   10.299882]  iwl_pcie_irq_handler+0x67d/0xb30 [iwlwifi]
> [   10.301076]  ? irq_forced_thread_fn+0x80/0x80
> [   10.302265]  irq_thread_fn+0x21/0x60
> [   10.303434]  ? irq_thread+0xa1/0x1a0
> [   10.304596]  irq_thread+0x107/0x1a0
> [   10.305766]  ? wake_threads_waitq+0x30/0x30
> [   10.306922]  ? irq_thread_dtor+0xa0/0xa0
> [   10.308078]  kthread+0x13e/0x160
> [   10.309246]  ? kthread_create_worker_on_cpu+0x70/0x70
> [   10.310410]  ret_from_fork+0x22/0x30
> 


-- 
Jiri Kosina
SUSE Labs




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