Subject: Re: [PATCH 1/5] ath10k: fix conf_mutex lock assert in ath10k_debug_fw_stats_request()

From: Kalle Valo <[email-masked]>
Date: Wed, 10 Feb 2021 08:09:15 +0000 (UTC)

Shuah Khan <[email-masked]> wrote:

> ath10k_debug_fw_stats_request() is called ath10k_sta_statistics()
> without holding conf_mutex. ath10k_debug_fw_stats_request() simply
> returns when CONFIG_ATH10K_DEBUGFS is disabled.
> 
> When CONFIG_ATH10K_DEBUGFS is enabled, ath10k_debug_fw_stats_request()
> code path isn't protected. This assert is triggered when CONFIG_LOCKDEP
> and CONFIG_ATH10K_DEBUGFS are enabled.
> 
> All other ath10k_debug_fw_stats_request() callers hold conf_mutex.
> Fix ath10k_sta_statistics() to do the same.
> 
> WARNING: CPU: 5 PID: 696 at drivers/net/wireless/ath/ath10k/debug.c:357 ath10k_debug_fw_stats_request+0x29a/0x2d0 [ath10k_core]
> Modules linked in: rfcomm ccm fuse cmac algif_hash algif_skcipher af_alg bnep binfmt_misc nls_iso8859_1 intel_rapl_msr intel_rapl_common snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm amdgpu snd_seq_midi snd_seq_midi_event snd_rawmidi edac_mce_amd snd_seq ath10k_pci ath10k_core aesni_intel gpu_sched drm_ttm_helper btusb ttm glue_helper crypto_simd btrtl ath cryptd drm_kms_helper snd_seq_device btbcm snd_timer rapl btintel cec i2c_algo_bit mac80211 bluetooth fb_sys_fops input_leds ecdh_generic snd wmi_bmof syscopyarea ecc serio_raw efi_pstore ccp k10temp sysfillrect soundcore sysimgblt snd_pci_acp3x cfg80211 ipmi_devintf libarc4 ipmi_msghandler mac_hid sch_fq_codel parport_pc ppdev lp parport drm ip_tables x_tables autofs4 hid_generic usbhid hid crc32_pclmul psmouse ahci nvme libahci i2c_piix4 nvme_core r8169 realtek wmi video
> CPU: 5 PID: 696 Comm: NetworkManager Tainted: G        W         5.11.0-rc7+ #20
> Hardware name: LENOVO 10VGCTO1WW/3130, BIOS M1XKT45A 08/21/2019
> RIP: 0010:ath10k_debug_fw_stats_request+0x29a/0x2d0 [ath10k_core]
> Code: 83 c4 10 44 89 f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 8d bf e8 20 00 00 be ff ff ff ff e8 de 2d 47 fa 85 c0 0f 85 8d fd ff ff <0f> 0b e9 86 fd ff ff 41 bf a1 ff ff ff 44 89 fa 48 c7 c6 2c 71 c4
> RSP: 0018:ffffaffbc124b7d0 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff93d02e4fec70 RCX: 0000000000000001
> RDX: 0000000000000000 RSI: ffff93d00cba5248 RDI: ffff93d00ab309a0
> RBP: ffffaffbc124b808 R08: 0000000000000000 R09: ffff93d02e4fec70
> R10: 0000000000000001 R11: 0000000000000246 R12: ffff93d00cba3160
> R13: ffff93d00cba3160 R14: ffff93d02e4fe4f0 R15: 0000000000000001
> FS:  00007f7ce8d50bc0(0000) GS:ffff93d137d40000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fc3595ad160 CR3: 000000010d492000 CR4: 00000000003506e0
> Call Trace:
>  ? sta_info_get_bss+0xeb/0x1f0 [mac80211]
>  ath10k_sta_statistics+0x4f/0x280 [ath10k_core]
>  sta_set_sinfo+0xda/0xd20 [mac80211]
>  ieee80211_get_station+0x58/0x80 [mac80211]
>  nl80211_get_station+0xbd/0x340 [cfg80211]
>  genl_family_rcv_msg_doit+0xe7/0x150
>  genl_rcv_msg+0xe2/0x1e0
>  ? nl80211_dump_station+0x3a0/0x3a0 [cfg80211]
>  ? nl80211_send_station+0xef0/0xef0 [cfg80211]
>  ? genl_get_cmd+0xd0/0xd0
>  netlink_rcv_skb+0x55/0x100
>  genl_rcv+0x29/0x40
>  netlink_unicast+0x1a8/0x270
>  netlink_sendmsg+0x253/0x480
>  sock_sendmsg+0x65/0x70
>  ____sys_sendmsg+0x219/0x260
>  ? __import_iovec+0x32/0x170
>  ___sys_sendmsg+0xb7/0x100
>  ? end_opal_session+0x39/0xd0
>  ? __fget_files+0xe0/0x1d0
>  ? find_held_lock+0x31/0x90
>  ? __fget_files+0xe0/0x1d0
>  ? __fget_files+0x103/0x1d0
>  ? __fget_light+0x32/0x80
>  __sys_sendmsg+0x5a/0xa0
>  ? syscall_enter_from_user_mode+0x21/0x60
>  __x64_sys_sendmsg+0x1f/0x30
>  do_syscall_64+0x38/0x50
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x7f7cea2c791d
> Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 4a 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 9e ee ff ff 48
> RSP: 002b:00007ffedf612a30 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00005618c4cfec00 RCX: 00007f7cea2c791d
> RDX: 0000000000000000 RSI: 00007ffedf612a80 RDI: 000000000000000b
> RBP: 00007ffedf612a80 R08: 0000000000000000 R09: 00005618c4e74000
> R10: 00005618c4da0590 R11: 0000000000000293 R12: 00005618c4cfec00
> R13: 00005618c4cfe2c0 R14: 00007f7cea32ef80 R15: 00005618c4cff340
> irq event stamp: 520897
> hardirqs last  enabled at (520903): [<ffffffffba501cc5>] console_unlock+0x4e5/0x5d0
> hardirqs last disabled at (520908): [<ffffffffba501c38>] console_unlock+0x458/0x5d0
> softirqs last  enabled at (520722): [<ffffffffbb201002>] asm_call_irq_on_stack+0x12/0x20
> softirqs last disabled at (520717): [<ffffffffbb201002>] asm_call_irq_on_stack+0x12/0x20
> 
> Signed-off-by: Shuah Khan <[email-masked]>

Bad timing, just yesterday I applied an identical patch: 

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=ath-next&id=7df28718928d08034b36168200d67b558ce36f3d

Patch set to Superseded.

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/[email-masked]/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches