Bug 2207473

Summary: [abrt] preempt_count_add: WARNING: CPU: 2 PID: 12448 at net/mac80211/util.c:2553 ieee80211_reconfig+0x9a/0x16f0 [mac80211]
Product: [Fedora] Fedora Reporter: Max <perevoznikov2000>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 38CC: acaringi, adscvr, airlied, alciregi, bskeggs, hdegoede, hpa, jarodwilson, josef, kernel-maint, lgoncalv, linville, masami256, mchehab, perevoznikov2000, ptalbert, steved
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Unspecified   
URL: https://retrace.fedoraproject.org/faf/reports/bthash/958144b4a400994ca29228169e498a0693ad096
Whiteboard: abrt_hash:3ba6e5f22ca7afa20c4a2ca71b024bddd54d700b;VARIANT_ID=workstation;
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
File: dmesg none

Description Max 2023-05-16 04:47:49 UTC
Additional info:
reporter:       libreport-2.17.9
WARNING: CPU: 2 PID: 12448 at net/mac80211/util.c:2553 ieee80211_reconfig+0x9a/0x16f0 [mac80211]
Modules linked in: uinput rfcomm snd_seq_dummy snd_hrtimer nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink qrtr bnep snd_ctl_led sunrpc ath10k_pci snd_hda_codec_realtek ath10k_core snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi uvcvideo snd_hda_intel videobuf2_vmalloc videobuf2_memops snd_intel_dspcfg snd_intel_sdw_acpi mac80211 videobuf2_v4l2 videobuf2_common intel_rapl_msr btusb snd_hda_codec intel_rapl_common btrtl edac_mce_amd binfmt_misc btbcm libarc4 videodev snd_hda_core ath kvm_amd vfat fat btintel snd_hwdep snd_seq snd_seq_device mc btmtk kvm snd_pcm acer_wmi bluetooth wmi_bmof irqbypass cfg80211 snd_timer sparse_keymap snd rapl pcspkr i2c_piix4 k10temp soundcore rfkill acpi_cpufreq acer_wireless joydev loop zram amdgpu rtsx_pci_sdmmc drm_ttm_helper ttm
 mmc_core iommu_v2 drm_buddy gpu_sched crct10dif_pclmul drm_display_helper crc32_pclmul crc32c_intel hid_multitouch polyval_clmulni polyval_generic ghash_clmulni_intel sha512_ssse3 sp5100_tco ccp rtsx_pci r8169 cec video wmi i2c_hid_acpi i2c_hid serio_raw ip6_tables ip_tables fuse
CPU: 2 PID: 12448 Comm: kworker/u32:40 Not tainted 6.2.11-300.fc38.x86_64 #1
Hardware name: Acer Aspire A315-41/Metapod_RR, BIOS V1.18 06/18/2020
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:ieee80211_reconfig+0x9a/0x16f0 [mac80211]
Code: 89 d7 4c 89 14 24 e8 05 aa fb ff 4c 8b 14 24 85 c0 41 89 c6 0f 84 27 03 00 00 48 c7 c7 10 0d 67 c1 4c 89 14 24 e8 56 c1 b0 d3 <0f> 0b 4c 8b 14 24 eb 3d 84 c0 0f 85 79 01 00 00 c6 87 8d 05 00 00
RSP: 0018:ffffa97fc2bafd70 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff94b203820518 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 0000000000000027 RDI: 00000000ffffffff
RBP: 0000000000000001 R08: ffffffff97064780 R09: ffffa97fc2bafcf8
R10: 3fffffffffffffff R11: 000000000000006f R12: 0000000000000010
R13: 0000000000000000 R14: 00000000ffffff92 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff94b423e80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000002448ce000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 ? preempt_count_add+0x6a/0xa0
 ? _raw_spin_lock_irq+0x19/0x40
 ? wait_for_completion+0x37/0x160
 ? preempt_count_add+0x6a/0xa0
 wiphy_resume+0x7f/0x160 [cfg80211]
 ? __pfx_wiphy_resume+0x10/0x10 [cfg80211]
 dpm_run_callback+0x8c/0x1e0
 device_resume+0xa2/0x1f0
 async_resume+0x1a/0x60
 async_run_entry_fn+0x30/0x130
 process_one_work+0x1c7/0x3d0
 worker_thread+0x4d/0x380
 ? __pfx_worker_thread+0x10/0x10
 kthread+0xe9/0x110
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x2c/0x50
 </TASK>

Potential duplicate: bug 1662844

Comment 1 Max 2023-05-16 04:47:54 UTC
Created attachment 1964815 [details]
File: dmesg

Comment 2 kraizel77 2023-06-23 14:49:12 UTC
Description of problem:
error shows up everytime I reboot the system Fedora 38

Version-Release number of selected component:
kernel-core-6.3.8-200.fc38

Additional info:
reporter:       libreport-2.17.10
kernel:         6.3.8-200.fc38.x86_64
crash_function: ieee80211_reconfig
runlevel:       N 5
comment:        error shows up everytime I reboot the system Fedora 38
reason:         WARNING: CPU: 9 PID: 3074 at net/mac80211/util.c:2540 ieee80211_reconfig+0x9e/0x16f0 [mac80211] [mac80211]
package:        kernel-core-6.3.8-200.fc38
type:           Kerneloops
cmdline:        BOOT_IMAGE=(hd2,gpt7)/boot/vmlinuz-6.3.8-200.fc38.x86_64 root=UUID=22256d1a-ba8b-4a04-ae07-407ff91a0d0c ro rhgb quiet

Truncated backtrace:
WARNING: CPU: 9 PID: 3074 at net/mac80211/util.c:2540 ieee80211_reconfig+0x9e/0x16f0 [mac80211]
Modules linked in: exfat uinput rfcomm snd_seq_dummy snd_hrtimer nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink qrtr bnep sunrpc binfmt_misc iwlmvm mac80211 snd_sof_amd_rembrandt snd_sof_amd_renoir libarc4 snd_sof_amd_acp snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_hda_codec_realtek snd_sof_utils snd_hda_codec_generic snd_soc_core ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_compress ac97_bus snd_intel_dspcfg intel_rapl_msr snd_pcm_dmaengine snd_intel_sdw_acpi iwlwifi intel_rapl_common snd_hda_codec snd_pci_ps snd_rpl_pci_acp6x edac_mce_amd snd_hda_core snd_pci_acp6x btusb snd_hwdep btrtl kvm_amd snd_seq btbcm btintel snd_seq_device cfg80211 btmtk kvm snd_pcm bluetooth vfat fat snd_pci_acp5x snd_timer snd_rn_pci_acp3x snd_acp_config irqbypass snd snd_soc_acpi rapl wmi_bmof i2c_piix4 k10temp pcspkr
 rfkill snd_pci_acp3x soundcore joydev acpi_cpufreq loop zram amdgpu hid_logitech_hidpp i2c_algo_bit drm_ttm_helper ttm crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic iommu_v2 drm_buddy nvme uas gpu_sched ghash_clmulni_intel usb_storage sha512_ssse3 drm_display_helper nvme_core sp5100_tco ccp r8169 cec nvme_common video wmi hid_logitech_dj ip6_tables ip_tables fuse
CPU: 9 PID: 3074 Comm: kworker/u32:34 Not tainted 6.3.8-200.fc38.x86_64 #1
Hardware name: AZW SER/SER, BIOS V1.15_P4C7M43_Blink 09/17/2022
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:ieee80211_reconfig+0x9e/0x16f0 [mac80211]
Code: 89 d7 4c 89 14 24 e8 c1 93 fb ff 4c 8b 14 24 85 c0 41 89 c6 0f 84 27 03 00 00 48 c7 c7 b0 71 a2 c1 4c 89 14 24 e8 52 94 75 f3 <0f> 0b 4c 8b 14 24 eb 3d 84 c0 0f 85 79 01 00 00 c6 87 8d 05 00 00
RSP: 0018:ffffbecec7ed3d70 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffa0a959638518 RCX: 0000000000000027
RDX: ffffa0b02e861548 RSI: 0000000000000001 RDI: ffffa0b02e861540
RBP: 0000000000000001 R08: ffffffffb70660c0 R09: ffffbecec7ed3cf8
R10: 3fffffffffffffff R11: 0000000000000000 R12: 0000000000000010
R13: 0000000000000000 R14: 00000000ffffff92 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffffa0b02e840000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000443022000 CR4: 0000000000750ee0
PKRU: 55555554
Call Trace:
 <TASK>
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? __warn+0x81/0x130
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? report_bug+0x171/0x1a0
 ? handle_bug+0x3c/0x80
 ? exc_invalid_op+0x17/0x70
 ? asm_exc_invalid_op+0x1a/0x20
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? wait_for_completion+0x3b/0x160
 wiphy_resume+0x83/0x160 [cfg80211]
 ? __pfx_wiphy_resume+0x10/0x10 [cfg80211]
 dpm_run_callback+0x8c/0x1e0
 device_resume+0xa2/0x1f0
 async_resume+0x1e/0x60
 async_run_entry_fn+0x34/0x130
 process_one_work+0x1c7/0x3d0
 worker_thread+0x51/0x390
 ? __pfx_worker_thread+0x10/0x10
 kthread+0xde/0x110
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x2c/0x50
 </TASK>

Comment 3 kraizel77 2023-06-29 10:08:44 UTC
Description of problem:
just rebooted the system and this error popped up

Version-Release number of selected component:
kernel-core-6.3.8-200.fc38

Additional info:
reporter:       libreport-2.17.10
kernel:         6.3.8-200.fc38.x86_64
crash_function: ieee80211_reconfig
runlevel:       N 5
comment:        just rebooted the system and this error popped up
reason:         WARNING: CPU: 2 PID: 1993 at net/mac80211/util.c:2540 ieee80211_reconfig+0x9e/0x16f0 [mac80211] [mac80211]
package:        kernel-core-6.3.8-200.fc38
type:           Kerneloops
cmdline:        BOOT_IMAGE=(hd2,gpt7)/boot/vmlinuz-6.3.8-200.fc38.x86_64 root=UUID=22256d1a-ba8b-4a04-ae07-407ff91a0d0c ro rhgb quiet

Truncated backtrace:
WARNING: CPU: 2 PID: 1993 at net/mac80211/util.c:2540 ieee80211_reconfig+0x9e/0x16f0 [mac80211]
Modules linked in: xt_MASQUERADE xt_mark nft_compat rfcomm snd_seq_dummy snd_hrtimer ip6table_nat tun nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink qrtr bnep sunrpc binfmt_misc iwlmvm snd_sof_amd_rembrandt mac80211 snd_sof_amd_renoir snd_sof_amd_acp snd_sof_pci snd_sof_xtensa_dsp intel_rapl_msr snd_hda_codec_realtek intel_rapl_common snd_sof edac_mce_amd snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi libarc4 kvm_amd snd_hda_intel snd_sof_utils snd_intel_dspcfg snd_soc_core snd_intel_sdw_acpi kvm iwlwifi snd_hda_codec snd_compress btusb ac97_bus snd_pcm_dmaengine btrtl snd_hda_core snd_pci_ps snd_rpl_pci_acp6x snd_pci_acp6x snd_hwdep btbcm snd_seq btintel snd_seq_device vfat btmtk irqbypass snd_pcm fat bluetooth cfg80211 snd_timer snd_pci_acp5x wmi_bmof rapl i2c_piix4 snd_rn_pci_acp3x snd
 snd_acp_config pcspkr snd_soc_acpi snd_pci_acp3x k10temp rfkill soundcore acpi_cpufreq joydev loop zram amdgpu hid_logitech_hidpp i2c_algo_bit drm_ttm_helper ttm iommu_v2 crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni drm_buddy polyval_generic nvme gpu_sched uas ghash_clmulni_intel sha512_ssse3 drm_display_helper usb_storage nvme_core sp5100_tco ccp r8169 cec nvme_common video wmi hid_logitech_dj ip6_tables ip_tables fuse
CPU: 2 PID: 1993 Comm: kworker/u32:13 Not tainted 6.3.8-200.fc38.x86_64 #1
Hardware name: AZW SER/SER, BIOS V1.15_P4C7M43_Blink 09/17/2022
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:ieee80211_reconfig+0x9e/0x16f0 [mac80211]
Code: 89 d7 4c 89 14 24 e8 c1 93 fb ff 4c 8b 14 24 85 c0 41 89 c6 0f 84 27 03 00 00 48 c7 c7 b0 a1 8b c1 4c 89 14 24 e8 52 64 8c ee <0f> 0b 4c 8b 14 24 eb 3d 84 c0 0f 85 79 01 00 00 c6 87 8d 05 00 00
RSP: 0018:ffffa9835490bd70 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8c4e07e48518 RCX: 0000000000000027
RDX: ffff8c54ee6a1548 RSI: 0000000000000001 RDI: ffff8c54ee6a1540
RBP: 0000000000000001 R08: ffffffffb20660c0 R09: ffffa9835490bcf8
R10: 3fffffffffffffff R11: 0000000000000000 R12: 0000000000000010
R13: 0000000000000000 R14: 00000000ffffff92 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8c54ee680000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000195022000 CR4: 0000000000750ee0
PKRU: 55555554
Call Trace:
 <TASK>
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? __warn+0x81/0x130
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? report_bug+0x171/0x1a0
 ? handle_bug+0x3c/0x80
 ? exc_invalid_op+0x17/0x70
 ? asm_exc_invalid_op+0x1a/0x20
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? wait_for_completion+0x3b/0x160
 wiphy_resume+0x83/0x160 [cfg80211]
 ? __pfx_wiphy_resume+0x10/0x10 [cfg80211]
 dpm_run_callback+0x8c/0x1e0
 device_resume+0xa2/0x1f0
 async_resume+0x1e/0x60
 async_run_entry_fn+0x34/0x130
 process_one_work+0x1c7/0x3d0
 worker_thread+0x51/0x390
 ? __pfx_worker_thread+0x10/0x10
 kthread+0xde/0x110
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x2c/0x50
 </TASK>

Comment 4 Marcus Santos 2023-07-20 02:05:17 UTC
Description of problem:
I dunno. After a short time without interact with notebook, it entering in hibernate mode
and only return after restart pressing power button

Version-Release number of selected component:
kernel-core-6.3.12-200.fc38

Additional info:
reporter:       libreport-2.17.11
kernel:         6.3.12-200.fc38.x86_64
crash_function: ieee80211_reconfig
type:           Kerneloops
cmdline:        BOOT_IMAGE=(hd1,gpt2)/vmlinuz-6.3.12-200.fc38.x86_64 root=UUID=1b36e409-0d28-4a48-a9e2-37441a2011fc ro rootflags=subvol=root rhgb quiet
package:        kernel-core-6.3.12-200.fc38
runlevel:       N 5
reason:         WARNING: CPU: 0 PID: 74167 at net/mac80211/util.c:2540 ieee80211_reconfig+0x9e/0x16f0 [mac80211] [mac80211]

Truncated backtrace:
WARNING: CPU: 0 PID: 74167 at net/mac80211/util.c:2540 ieee80211_reconfig+0x9e/0x16f0 [mac80211]
Modules linked in: xt_addrtype xt_nat xt_mark xt_conntrack xt_comment xt_MASQUERADE nft_compat veth bridge stp llc tun overlay uinput rfcomm snd_seq_dummy snd_hrtimer nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink sunrpc qrtr bnep binfmt_misc vfat fat snd_sof_pci_intel_cnl snd_sof_intel_hda_common soundwire_intel soundwire_generic_allocation soundwire_cadence snd_sof_intel_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_sof_utils soundwire_bus snd_soc_skl snd_soc_hdac_hda snd_hda_ext_core snd_soc_sst_ipc ath10k_pci snd_soc_sst_dsp snd_soc_acpi_intel_match snd_soc_acpi snd_hda_codec_realtek snd_soc_core ath10k_core snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_compress intel_tcc_cooling ac97_bus x86_pkg_temp_thermal snd_pcm_dmaengine intel_powerclamp coretemp snd_hda_intel kvm_intel
 snd_intel_dspcfg snd_intel_sdw_acpi mac80211 snd_hda_codec kvm uvcvideo btusb uvc snd_hda_core videobuf2_vmalloc snd_hwdep btrtl videobuf2_memops snd_seq iTCO_wdt libarc4 snd_seq_device videobuf2_v4l2 ath videobuf2_common btbcm irqbypass intel_pmc_bxt processor_thermal_device_pci_legacy btintel videodev snd_pcm processor_thermal_device iTCO_vendor_support ee1004 btmtk processor_thermal_rfim mei_hdcp mei_pxp intel_rapl_msr ucsi_ccg rapl processor_thermal_mbox cfg80211 snd_timer intel_cstate i2c_i801 snd ideapad_laptop bluetooth intel_wmi_thunderbolt wmi_bmof pcspkr i2c_smbus mei_me intel_uncore processor_thermal_rapl mc intel_rapl_common sparse_keymap mei platform_profile soundcore int3403_thermal intel_soc_dts_iosf intel_pch_thermal rfkill idma64 i2c_nvidia_gpu int340x_thermal_zone acpi_pad int3400_thermal acpi_thermal_rel acpi_tad joydev loop zram nouveau drm_ttm_helper ttm nvme i2c_algo_bit mxm_wmi nvme_core drm_display_helper crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni hid_multitouch
 ucsi_acpi polyval_generic ghash_clmulni_intel typec_ucsi r8169 sha512_ssse3 cec nvme_common typec i2c_hid_acpi i2c_hid video wmi pinctrl_cannonlake serio_raw ip6_tables ip_tables fuse
CPU: 0 PID: 74167 Comm: kworker/u24:72 Not tainted 6.3.12-200.fc38.x86_64 #1
Hardware name: LENOVO 81RJ/LNVNB161216, BIOS BHCN26WW 05/05/2019
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:ieee80211_reconfig+0x9e/0x16f0 [mac80211]
Code: 89 d7 4c 89 14 24 e8 61 93 fb ff 4c 8b 14 24 85 c0 41 89 c6 0f 84 27 03 00 00 48 c7 c7 b0 01 4b c2 4c 89 14 24 e8 b2 11 cd c7 <0f> 0b 4c 8b 14 24 eb 3d 84 c0 0f 85 79 01 00 00 c6 87 8d 05 00 00
RSP: 0018:ffff9e7c844cbd70 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff902560bb0518 RCX: 0000000000000027
RDX: ffff90288da21548 RSI: 0000000000000001 RDI: ffff90288da21540
RBP: 0000000000000001 R08: ffffffff8c0660c0 R09: ffff9e7c844cbcf8
R10: 0000000000000002 R11: ffffffff8c129188 R12: 0000000000000010
R13: 0000000000000000 R14: 00000000fffffff4 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff90288da00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa9f53cd3c CR3: 000000027a022003 CR4: 00000000003706f0
Call Trace:
 <TASK>
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? __warn+0x81/0x130
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? report_bug+0x171/0x1a0
 ? handle_bug+0x3c/0x80
 ? exc_invalid_op+0x17/0x70
 ? asm_exc_invalid_op+0x1a/0x20
 ? ieee80211_reconfig+0x9e/0x16f0 [mac80211]
 ? wait_for_completion+0x3b/0x160
 wiphy_resume+0x80/0x160 [cfg80211]
 ? __pfx_wiphy_resume+0x10/0x10 [cfg80211]
 dpm_run_callback+0x89/0x1e0
 device_resume+0xa2/0x1f0
 async_resume+0x1e/0x60
 async_run_entry_fn+0x31/0x130
 process_one_work+0x1c4/0x3d0
 worker_thread+0x51/0x390
 ? __pfx_worker_thread+0x10/0x10
 kthread+0xdb/0x110
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x29/0x50
 </TASK>