[Madwifi-devel] reproducible "scheduling while atomic" in "iwpriv ath0 mode 3"

[Daniel Wu <dy...@gm...>]

Hi,

I was wondering if this can be tried by others before I put it into a
ticket.

list of commands used:
modprobe ath_pci
wlanconfig ath0 create wlandev wifi0 wlanmode wds
iwpriv ath0 mode 3
<or>
iwpriv ath0 mode 1

which will give this trace:
Debug: sleeping function called from invalid context at kernel/sched.c:3239
in_atomic():1, irqs_disabled():0
 [<c030b985>] wait_for_completion+0x1a/0xf9
 [<c0129c05>] __queue_work+0x45/0x54
 [<c0129bab>] call_usermodehelper_keys+0xe7/0xfc
 [<c0129a74>] __call_usermodehelper+0x0/0x50
 [<c01298cc>] request_module+0x9c/0xdd
 [<e0bd09c7>] ieee80211_load_module+0xb/0x11 [wlan]
 [<e0bc9df7>] ieee80211_scanner_get+0x23/0x2c [wlan]
 [<e0bca13a>] ieee80211_start_scan+0x2a/0x275 [wlan]
 [<e0836811>] journal_stop+0x153/0x218 [jbd]
 [<e08c7dfa>] ext3_mark_iloc_dirty+0xf/0x16 [ext3]
 [<e08c7ec5>] ext3_mark_inode_dirty+0x38/0x3f [ext3]
 [<e0bc94d4>] __ieee80211_newstate+0x240/0x781 [wlan]
 [<e0bc9b6f>] ieee80211_newstate+0x15a/0x22f [wlan]
 [<e098dad6>] ath_newstate+0xec/0x762 [ath_pci]
 [<e098a4b2>] ath_wme_update+0x79/0x86 [ath_pci]
 [<e0bc8c21>] ieee80211_wme_updateparams_locked+0xd5/0x1ed [wlan]
 [<c030cb48>] _spin_unlock_bh+0x5/0xa
 [<e0bc9284>] ieee80211_new_state+0x26/0x36 [wlan]
 [<e0bcd4ee>] ieee80211_ioctl_setmode+0x164/0x184 [wlan]
 [<c0206937>] acpi_pci_link_set+0x8/0x17f
 [<c02b92cf>] wireless_process_ioctl+0x12e/0x6f6
 [<c014aaa7>] do_no_page+0x16e/0x301
 [<e0bcd38a>] ieee80211_ioctl_setmode+0x0/0x184 [wlan]
 [<c02afd05>] dev_ioctl+0x250/0x297
 [<c02a55d8>] sock_ioctl+0x0/0x25a
 [<c0169ff9>] do_ioctl+0x19/0x55
 [<c030d91e>] do_page_fault+0x25e/0x640
 [<c016a127>] vfs_ioctl+0x50/0x1aa
 [<c016a2de>] sys_ioctl+0x5d/0x6b
 [<c0102edd>] syscall_call+0x7/0xb
scheduling while atomic: iwpriv/0x00000100/6937
 [<c030b8b4>] schedule+0x504/0x5bb
 [<c0102edd>] syscall_call+0x7/0xb
 [<c012b1a6>] __kernel_text_address+0x1c/0x27
 [<c0103329>] show_trace+0x2a/0x78
 [<c0102edd>] syscall_call+0x7/0xb
 [<c030ba05>] wait_for_completion+0x9a/0xf9
 [<c0117614>] default_wake_function+0x0/0xc
 [<c0129bab>] call_usermodehelper_keys+0xe7/0xfc
 [<c0129a74>] __call_usermodehelper+0x0/0x50
 [<c01298cc>] request_module+0x9c/0xdd
 [<e0bd09c7>] ieee80211_load_module+0xb/0x11 [wlan]
 [<e0bc9df7>] ieee80211_scanner_get+0x23/0x2c [wlan]
 [<e0bca13a>] ieee80211_start_scan+0x2a/0x275 [wlan]
 [<e0836811>] journal_stop+0x153/0x218 [jbd]
 [<e08c7dfa>] ext3_mark_iloc_dirty+0xf/0x16 [ext3]
 [<e08c7ec5>] ext3_mark_inode_dirty+0x38/0x3f [ext3]
 [<e0bc94d4>] __ieee80211_newstate+0x240/0x781 [wlan]
 [<e0bc9b6f>] ieee80211_newstate+0x15a/0x22f [wlan]
 [<e098dad6>] ath_newstate+0xec/0x762 [ath_pci]
 [<e098a4b2>] ath_wme_update+0x79/0x86 [ath_pci]
 [<e0bc8c21>] ieee80211_wme_updateparams_locked+0xd5/0x1ed [wlan]
 [<c030cb48>] _spin_unlock_bh+0x5/0xa
 [<e0bc9284>] ieee80211_new_state+0x26/0x36 [wlan]
 [<e0bcd4ee>] ieee80211_ioctl_setmode+0x164/0x184 [wlan]
 [<c0206937>] acpi_pci_link_set+0x8/0x17f
 [<c02b92cf>] wireless_process_ioctl+0x12e/0x6f6
 [<c014aaa7>] do_no_page+0x16e/0x301
 [<e0bcd38a>] ieee80211_ioctl_setmode+0x0/0x184 [wlan]
 [<c02afd05>] dev_ioctl+0x250/0x297
 [<c02a55d8>] sock_ioctl+0x0/0x25a
 [<c0169ff9>] do_ioctl+0x19/0x55
 [<c030d91e>] do_page_fault+0x25e/0x640
 [<c016a127>] vfs_ioctl+0x50/0x1aa
 [<c016a2de>] sys_ioctl+0x5d/0x6b
 [<c0102edd>] syscall_call+0x7/0xb


I'm now wondering how people changed to different a/b/g configs when in wds
mode ?
I'm thinking it has to do with the ieee80211_load_module+0xb/0x11,
ieee80211_scanner_get+0x23/0x2c,  ieee80211_start_scan+0x2a/0x275 calls.
I thought this might also be related to the "wlan_scan_sta" not loaded
things since there is no "wlan_scan_wds" out there.

this also happens in monitor mode,

System is a Fedora Core 4,  2.6.14-1.1637_FC4,
Wireless-tools version 28, wireless extensions v19.
latest svn copy of madwifi (1393),

ath_hal: module license 'Proprietary' taints kernel.
ath_hal: 0.9.16.13 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413,
DFS)
wlan: 0.8.4.2 (Atheros/multi-bss)
ath_rate_sample: 1.2
ath_pci: 0.9.4.5 (Atheros/multi-bss)
wifi0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
wifi0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps
24Mbps 36Mbps 48Mbps 54Mbps
wifi0: turboA rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: H/W encryption support: WEP AES AES_CCM TKIP
wifi0: mac 5.6 phy 4.1 5ghz radio 1.7 2ghz radio 2.3
wifi0: Use hw queue 1 for WME_AC_BE traffic
wifi0: Use hw queue 0 for WME_AC_BK traffic
wifi0: Use hw queue 2 for WME_AC_VI traffic
wifi0: Use hw queue 3 for WME_AC_VO traffic
wifi0: Use hw queue 8 for CAB traffic
wifi0: Use hw queue 9 for beacons
wifi0: Atheros 5212: mem=3D0x90080000, irq=3D11


--dyqith