What was that about locking not having problems? :P I was writing a small program that (using ioctls) * creates a new interface (using sysfs) * sets the interface to monitor mode * sets IFF_UP * (1) * sets IFF_DOWN * (2) * destroy interface (using sysfs)
That was fine, but then I wanted to see this happening and added "system("iwconfig")" at the two places marked (1) and (2), which triggered below bug. Note the address, I have slab debugging enabled.
[12143.789779] BUG: unable to handle kernel paging request at virtual address 6b6b752f [12143.789785] printing eip: [12143.789787] e2cc1df0 [12143.789789] *pde = 00000000 [12143.789792] Oops: 0000 [#1] [12143.789794] PREEMPT [12143.789796] Modules linked in: arc4 rate_control rt2500usb 80211 ipv6 af_packet speedstep_lib cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video sbs thermal i2c_ec i2c_core processor fan button battery container ac asus_acpi sr_mod sbp2 snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer 8250_pnp snd soundcore floppy 8250 serial_core psmouse snd_page_alloc skge crc32 ohci1394 ieee1394 rtc pcspkr ehci_hcd uhci_hcd usbcore sg evdev [12143.789831] CPU: 0 [12143.789832] EIP: 0060:[<e2cc1df0>] Not tainted VLI [12143.789833] EFLAGS: 00210282 (2.6.18-rc4 #2) [12143.789850] EIP is at ieee80211_sta_scan_work+0x1a/0x406 [80211] [12143.789853] eax: d517c320 ebx: cda019d8 ecx: c0128a7e edx: c1490000 [12143.789856] esi: cda019dc edi: 6b6b6b6b ebp: c1491f4c esp: c1491eec [12143.789859] ds: 007b es: 007b ss: 0068 [12143.789862] Process events/0 (pid: 4, ti=c1490000 task=c1488070 task.ti=c1490000) [12143.789864] Stack: 00200046 00200046 00200046 00000000 c042653c 00200046 00000000 c1476888 [12143.789872] d517c000 d517c320 00200046 00000002 00000001 c0128a28 c147686c c0128a7e [12143.789879] 00200046 c147686c c147686c 00200292 c1491f4c cda019d8 cda019dc c147686c [12143.789887] Call Trace: [12143.789889] [<c010418f>] show_stack_log_lvl+0xa8/0xe5 [12143.789895] [<c0104365>] show_registers+0x199/0x229 [12143.789899] [<c0104844>] die+0x118/0x2ac [12143.789902] [<c0113db9>] do_page_fault+0x280/0x599 [12143.789908] [<c0103ad5>] error_code+0x39/0x40 [12143.789912] [<c0128a8e>] run_workqueue+0x76/0xea [12143.789917] [<c0128c88>] worker_thread+0xe4/0x11c [12143.789921] [<c012b82e>] kthread+0xcf/0xd3 [12143.789925] [<c0101005>] kernel_thread_helper+0x5/0xb [12143.789928] Code: ba 03 00 00 00 89 d8 e8 9c de 5c dd e9 e6 fe ff ff 55 89 e5 57 56 53 83 ec 54 89 45 c0 8b b8 c0 00 00 00 05 20 03 00 00 89 45 c4 <8b> 87 c4 09 00 00 89 45 b4 85 c0 0f 84 18 01 00 00 8b 87 d0 09 [12143.789964] EIP: [<e2cc1df0>] ieee80211_sta_scan_work+0x1a/0x406 [80211] SS:ESP 0068:c1491eec [12143.789977] - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
