Hi Emmanuel,
was debugging some issue in ath9k with UDP bidirectional traffic and
then used my inbuilt iwlwifi with bidirectional UDP had this warnings
* iwlagn_mac_ampdu_action->iwlagn_tx_agg_start -> (we take spinlock
'sta_lock' ) -> iwl_trans_tx_agg_alloc (which has might_sleep)
* iwlagn_mac_ampdu_action->iwlagn_tx_agg_stop -> (we take spinlock
'sta_lock' ) -> iwl_trans_tx_agg_disable (which has might_sleep)
BUG: sleeping function called from invalid context at
drivers/net/wireless/iwlwifi/iwl-trans.h:452
[ 1424.360233] in_atomic(): 1, irqs_disabled(): 1, pid: 2824, name: kworker/u:3
[ 1424.360236] 5 locks held by kworker/u:3/2824:
[ 1424.360238] #0: (wiphy_name(local->hw.wiphy)){.+.+.+}, at:
[<c0150e3b>] process_one_work+0x11b/0x520
[ 1424.360249] #1: ((&sta->ampdu_mlme.work)){+.+...}, at:
[<c0150e3b>] process_one_work+0x11b/0x520
[ 1424.360256] #2: (&sta->ampdu_mlme.mtx){+.+.+.}, at: [<f908db43>]
ieee80211_ba_session_work+0x43/0x1e0 [mac80211]
[ 1424.360275] #3: (&priv->shrd->mutex){+.+.+.}, at: [<f97a9f20>]
iwlagn_mac_ampdu_action+0xc0/0x3a0 [iwlwifi]
[ 1424.360288] #4: (&(&priv->shrd->sta_lock)->rlock){..-...}, at:
[<f97b090a>] iwlagn_tx_agg_start+0xda/0x2a0 [iwlwifi]
[ 1424.360301] irq event stamp: 4366
[ 1424.360302] hardirqs last enabled at (4365): [<c0202fba>]
__free_pages_ok+0x9a/0xd0
[ 1424.360307] hardirqs last disabled at (4366): [<c069ac59>]
_raw_spin_lock_irqsave+0x29/0xa0
[ 1424.360313] softirqs last enabled at (4330): [<f908dbbf>]
ieee80211_ba_session_work+0xbf/0x1e0 [mac80211]
[ 1424.360331] softirqs last disabled at (4328): [<c069ae04>]
_raw_spin_lock_bh+0x14/0x80
[ 1424.360336] Pid: 2824, comm: kworker/u:3 Not tainted 3.3.0-rc5-wl+ #13
[ 1424.360338] Call Trace:
[ 1424.360342] [<c0163e75>] __might_sleep+0x125/0x1c0
[ 1424.360351] [<f97b0946>] iwlagn_tx_agg_start+0x116/0x2a0 [iwlwifi]
[ 1424.360359] [<f97aa0a0>] iwlagn_mac_ampdu_action+0x240/0x3a0 [iwlwifi]
[ 1424.360367] [<f97a9e60>] ? iwlagn_mac_flush+0x200/0x200 [iwlwifi]
[ 1424.360379] [<f908f03a>]
ieee80211_tx_ba_session_handle_start+0xfa/0x590 [mac80211]
[ 1424.360392] [<f908dbc8>] ieee80211_ba_session_work+0xc8/0x1e0 [mac80211]
[ 1424.360395] [<c0150eb4>] process_one_work+0x194/0x520
[ 1424.360398] [<c0150e3b>] ? process_one_work+0x11b/0x520
[ 1424.360401] [<c01527f6>] ? worker_thread+0x1f6/0x320
[ 1424.360413] [<f908db00>] ?
ieee80211_ht_cap_ie_to_sta_ht_cap+0x170/0x170 [mac80211]
[ 1424.360417] [<c015273b>] worker_thread+0x13b/0x320
[ 1424.360420] [<c01915cb>] ? trace_hardirqs_on+0xb/0x10
[ 1424.360423] [<c0152600>] ? manage_workers+0x1e0/0x1e0
[ 1424.360426] [<c01574b4>] kthread+0x84/0x90
[ 1424.360430] [<c0157430>] ? __init_kthread_worker+0x60/0x60
[ 1424.360434] [<c06a3146>] kernel_thread_helper+0x6/0x10
[ 1424.360631] activated addBA response timer on tid 0
[ 1424.361847] switched off addBA timer for tid 0
29 19:09:50 shafi-laptop kernel: [ 2684.644136] BUG: sleeping function
called from invalid context at
drivers/net/wireless/iwlwifi/iwl-trans.h:441
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644149] in_atomic(): 1,
irqs_disabled(): 1, pid: 39, name: kworker/u:1
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644158] 5 locks held by
kworker/u:1/39:
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644164] #0:
(wiphy_name(local->hw.wiphy)){.+.+.+}, at: [<c0150e3b>]
process_one_work+0x11b/0x520
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644194] #1:
((&sta->ampdu_mlme.work)){+.+...}, at: [<c0150e3b>]
process_one_work+0x11b/0x520
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644215] #2:
(&sta->ampdu_mlme.mtx){+.+.+.}, at: [<f908db43>]
ieee80211_ba_session_work+0x43/0x1e0 [mac80211]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644275] #3:
(&priv->shrd->mutex){+.+.+.}, at: [<f97a9f20>]
iwlagn_mac_ampdu_action+0xc0/0x3a0 [iwlwifi]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644316] #4:
(&(&priv->shrd->lock)->rlock){..-...}, at: [<f97b0be2>]
iwlagn_tx_agg_stop+0x112/0x2b0 [iwlwifi]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644357] irq event stamp: 1301302
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644363] hardirqs last
enabled at (1301301): [<c06986da>] __mutex_lock_common+0x25a/0x390
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644378] hardirqs last
disabled at (1301302): [<c069ac59>] _raw_spin_lock_irqsave+0x29/0xa0
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644391] softirqs last
enabled at (1301278): [<f908e9e7>]
___ieee80211_stop_tx_ba_session+0x147/0x380 [mac80211]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644436] softirqs last
disabled at (1301276): [<c069ae04>] _raw_spin_lock_bh+0x14/0x80
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644452] Pid: 39, comm:
kworker/u:1 Not tainted 3.3.0-rc5-wl+ #13
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644459] Call Trace:
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644474] [<c0163e75>]
__might_sleep+0x125/0x1c0
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644504] [<f97b0bfb>]
iwlagn_tx_agg_stop+0x12b/0x2b0 [iwlwifi]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644536] [<f97a9fcc>]
iwlagn_mac_ampdu_action+0x16c/0x3a0 [iwlwifi]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644583] [<f908eaba>]
___ieee80211_stop_tx_ba_session+0x21a/0x380 [mac80211]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644612] [<f97a9e60>] ?
iwlagn_mac_flush+0x200/0x200 [iwlwifi]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644655] [<f908dc75>]
ieee80211_ba_session_work+0x175/0x1e0 [mac80211]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644667] [<c0150eb4>]
process_one_work+0x194/0x520
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644678] [<c0150e3b>] ?
process_one_work+0x11b/0x520
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644688] [<c01527f6>] ?
worker_thread+0x1f6/0x320
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644730] [<f908db00>] ?
ieee80211_ht_cap_ie_to_sta_ht_cap+0x170/0x170 [mac80211]
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644746] [<c015273b>]
worker_thread+0x13b/0x320
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644757] [<c01915cb>] ?
trace_hardirqs_on+0xb/0x10
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644768] [<c0152600>] ?
manage_workers+0x1e0/0x1e0
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644779] [<c01574b4>]
kthread+0x84/0x90
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644791] [<c0157430>] ?
__init_kthread_worker+0x60/0x60
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.644804] [<c06a3146>]
kernel_thread_helper+0x6/0x10
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.645426] Stopping Tx BA
session for 00:03:7f:40:02:c0 tid 0
Feb 29 19:09:50 shafi-laptop kernel: [ 2684.705473] ath: NETWORK SLEEP -> AWAKE
--
thanks,
shafi
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