Emmanuel Grumbach <egrumbach@xxxxxxxxx> writes: > Please use iw instead of iwconfig. If it reproduces with iw, please > reprdoduce with debug=0xf. This problem doesn't show up with iw: # iw wlan0 set type ibss # ip link set up wlan0 # iw wlan0 set bitrates legacy-2.4 6 # iw wlan0 ibss join XXX 2462 However, the card doesn't join the ad hoc network. It creates a new IBSS instead. Repeating: # iw wlan0 ibss leave # iw wlan0 ibss join XXX 2462 doesn't fix it, the card comes with a new IBSS (almost) each time. # ip link set wlan0 down # ip link set wlan0 up # iw wlan0 ibss join XXX 2462 doesn't fix it either. It seems that after some time (scan interval?) the join command starts to work - it manages to see the old existing IBSS. It doesn't automatically join, though - I have to re-issue the join command. I did: insmod iwlwifi debug=65535 and the initial dmesg differences between "bad" (new IBSS) and "good" (joining existing IBSS) are: --- bad +++ good I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command POWER_TABLE_CMD U iwl_mvm_up RT uCode started. I iwl_mvm_prepare_multicast mcast addr (0): 01:00:5e:00:00:01 The bad case: too early to scan for other BSSIDs (net/mac80211/ibss.c): -wlan0: Creating new IBSS network, BSSID 7e:16:f5:00:11:d2 -U iwl_mvm_add_chanctx Add channel context -U iwl_pcie_send_hcmd_sync Attempting to send sync command PHY_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command PHY_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command PHY_CONTEXT_CMD (#8), seq: 0x091A, 40 bytes at 26[26]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command PHY_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Attempting to send sync command PHY_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command PHY_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command PHY_CONTEXT_CMD (#8), seq: 0x091B, 40 bytes at 27[27]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command PHY_CONTEXT_CMD -U iwl_mvm_bt_udpate_ctrl_kill_msk Update kill_msk: 0 - SCO inactive A2DP inactive SNIFF inactive -I iwl_pcie_enqueue_hcmd Sending command BEACON_TEMPLATE_CMD (#91), seq: 0x091C, 149 bytes at 28[28]:9 -U iwl_pcie_send_hcmd_sync Attempting to send sync command MAC_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command MAC_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command MAC_CONTEXT_CMD (#28), seq: 0x091D, 152 bytes at 29[29]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command MAC_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command REPLY_SF_CFG_CMD (#d1), seq: 0x091E, 96 bytes at 30[30]:9 -U iwl_pcie_send_hcmd_sync Attempting to send sync command BINDING_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command BINDING_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command BINDING_CONTEXT_CMD (#2b), seq: 0x091F, 28 bytes at 31[31]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command BINDING_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Attempting to send sync command ADD_STA -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command ADD_STA -I iwl_pcie_enqueue_hcmd Sending command ADD_STA (#18), seq: 0x0920, 48 bytes at 32[0]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command ADD_STA -U iwl_mvm_add_int_sta_common Internal station added. -U iwl_pcie_send_hcmd_sync Attempting to send sync command TIME_QUOTA_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command TIME_QUOTA_CMD -I iwl_pcie_enqueue_hcmd Sending command TIME_QUOTA_CMD (#2c), seq: 0x0921, 52 bytes at 33[1]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command TIME_QUOTA_CMD -U iwl_mvm_bt_udpate_ctrl_kill_msk Update kill_msk: 0 - SCO inactive A2DP inactive SNIFF inactive -U iwl_pcie_send_hcmd_sync Attempting to send sync command MAC_CONTEXT_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command MAC_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command MAC_CONTEXT_CMD (#28), seq: 0x0922, 152 bytes at 34[2]:9 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command MAC_CONTEXT_CMD -I iwl_pcie_enqueue_hcmd Sending command BEACON_TEMPLATE_CMD (#91), seq: 0x0923, 149 bytes at 35[3]:9 The good case: +wlan0: Trigger new scan to find an IBSS to join U iwl_mvm_scan_request Handling mac80211 scan request U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD I think the problems is somewhere here - multiple scans don't find our existing IBSS: -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x0924, 1054 bytes at 36[4]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=13 -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x0925, 1254 bytes at 37[5]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=25 -wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x0926, 1029 bytes at 38[6]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=11 -wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x0927, 1029 bytes at 39[7]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=11 -wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x0928, 1029 bytes at 40[8]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=11 -wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x0929, 1029 bytes at 41[9]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=11 -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x092A, 1054 bytes at 42[10]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=13 -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x092B, 1254 bytes at 43[11]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=25 -wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x092C, 1029 bytes at 44[12]:9 -U iwl_mvm_rx_scan_response Scan response received. status 0x1 -I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD -U iwl_mvm_scan_request Scan request was sent successfully -U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=11 -wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) -U iwl_mvm_scan_request Handling mac80211 scan request -U iwl_pcie_send_hcmd_sync Attempting to send sync command SCAN_REQUEST_CMD -U iwl_pcie_send_hcmd_sync Setting HCMD_ACTIVE for command SCAN_REQUEST_CMD -I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x092D, 1029 bytes at 45[13]:9 +I iwl_pcie_enqueue_hcmd Sending command SCAN_REQUEST_CMD (#80), seq: 0x091A, 1029 bytes at 26[26]:9 U iwl_mvm_rx_scan_response Scan response received. status 0x1 I iwl_pcie_hcmd_complete Clearing HCMD_ACTIVE for command SCAN_REQUEST_CMD U iwl_mvm_scan_request Scan request was sent successfully U iwl_mvm_rx_scan_complete Scan complete: status=0x1 scanned channels=11 When it works: +wlan0: Selected IBSS BSSID 82:3c:82:2a:c2:90 based on configured SSID Another issue I found in the logs today: wlan0: Creating new IBSS network, BSSID ce:bd:57:f4:48:73 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 683 at net/mac80211/rate.c:249 __rate_control_send_low+0x105/0x110() CPU: 1 PID: 683 Comm: kworker/u8:3 Not tainted 3.15.0-rc5+ #42 Hardware name: GETAC F110/F110, BIOS R1.04.070520 01/02/2014 Workqueue: phy0 ieee80211_iface_work 00000000 00000000 f2d9fbd8 c13e04c0 00000000 f2d9fc08 c1034e64 c149c288 00000001 000002ab c14ed3d4 000000f9 c13baa35 c13baa35 00000000 00000010 00000001 f2d9fc18 c1034efd 00000009 00000000 f2d9fc3c c13baa35 cb178360 Call Trace: [<c13e04c0>] dump_stack+0x41/0x52 [<c1034e64>] warn_slowpath_common+0x74/0x90 [<c13baa35>] ? __rate_control_send_low+0x105/0x110 [<c13baa35>] ? __rate_control_send_low+0x105/0x110 [<c1034efd>] warn_slowpath_null+0x1d/0x20 [<c13baa35>] __rate_control_send_low+0x105/0x110 [<c13bab77>] rate_control_send_low+0x47/0x110 [<f8588771>] rs_get_rate+0x41/0xd0 [iwlmvm] [<c13bb525>] rate_control_get_rate+0xa5/0xe0 [<c13c66a4>] invoke_tx_handlers+0x724/0x1380 [<c13e4ae3>] ? _raw_spin_unlock_bh+0x13/0x20 [<c138c226>] ? cfg80211_put_bss+0x36/0x60 [<c13b0332>] ? ieee80211_rx_bss_put+0x12/0x20 [<c13b5e01>] ? ieee80211_rx_mgmt_probe_beacon+0x261/0x6b0 [<c13c7b9e>] ieee80211_tx+0x5e/0xd0 [<c13c81e1>] ieee80211_xmit+0x81/0xb0 [<c13c8fc5>] __ieee80211_tx_skb_tid_band+0x55/0x70 [<c13cc34a>] ieee80211_send_auth+0x12a/0x190 [<c13b6c57>] ieee80211_ibss_rx_queued_mgmt+0x3a7/0x3f0 [<c10592c4>] ? sched_clock_cpu+0x104/0x110 [<c105e464>] ? pick_next_task_fair+0x234/0x3d0 [<c1305b90>] ? skb_dequeue+0x40/0x60 [<c13b864a>] ieee80211_iface_work+0x22a/0x300 [<c1047691>] process_one_work+0xd1/0x2f0 [<c1048159>] worker_thread+0xf9/0x330 [<c1048060>] ? manage_workers.isra.30+0x250/0x250 [<c104c9cc>] kthread+0x9c/0xb0 [<c13e55c1>] ret_from_kernel_thread+0x21/0x30 [<c104c930>] ? kthread_create_on_node+0x100/0x100 ---[ end trace a3876c6586762df6 ]--- wlan0: Selected IBSS BSSID 6e:f7:6f:75:67:57 based on configured SSID Thanks for looking at this. -- Krzysztof Halasa Research Institute for Automation and Measurements PIAP Al. 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