Kristoffer Ericson wrote: > On Sat, 11 Apr 2009 10:41:35 +0100 > Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx> wrote: > > >> Regression #6 on latest git! (last known good is 2.6.29-rc8) >> >> My EEE PC hangs on bootup if it is not connected to mains power. The >> hang happens during udev coldplug. I've left it for >60 seconds with >> nmi_watchdog=1, soft lockup and hung task detection are enabled, and I >> get no trace. Key presses are not echoed to the screen. >> > > Getting this myself, even if power cord attached. Its an tainted > kernel though (archlinux 2.6.28) so wasnt sure if > vanilla was affected. > > BUG: unable to handle kernel NULL pointer dereference at 00000000 > IP: [<f850d031>] acpi_ac_get_state+0x1b/0x59 [ac] > *pde = 00000000 > Oops: 0000 [#1] PREEMPT SMP > last sysfs file: /sys/devices/platform/i8042/modalias > Modules linked in: joydev psmouse snd_pcsp serio_raw i2c_i801 iTCO_wdt iTCO_vendor_support i2c_core uvcvideo compat_ioctl32 videodev v4l1_compat sg option usbserial video output eeepc_laptop rfkill intel_agp agpgart thermal processor fan evdev button battery ac snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_hda_intel snd_hwdep snd_pcm_oss snd_pcm snd_timer snd_page_alloc snd_mixer_oss snd soundcore ath_pci wlan ath_hal(P) arc4 ecb ath5k mac80211 led_class cfg80211 atl2 rtc_cmos rtc_core rtc_lib ext3 jbd mbcache usbhid hid usb_storage sd_mod uhci_hcd ehci_hcd usbcore ata_piix ahci ata_generic pata_acpi libata scsi_mod > > Pid: 1794, comm: fsck.ext3 Tainted: P (2.6.28-ARCH #1) 701 > EIP: 0060:[<f850d031>] EFLAGS: 00010246 CPU: 0 > EIP is at acpi_ac_get_state+0x1b/0x59 [ac] > EAX: f69559dc EBX: 00000000 ECX: 00000000 EDX: f850d418 > ESI: f6955980 EDI: 00000001 EBP: f6834480 ESP: f6853f0c > DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 > Process fsck.ext3 (pid: 1794, ti=f6852000 task=f737e400 task.ti=f6852000) > Stack: > f69559dc f6955980 f692e360 f850d2fd 00000001 f692e360 c01ab0e0 00000400 > b80cb000 f6834480 f692e380 00000000 00000000 00000001 00000000 00000000 > f7327c00 fffffffb c01aafb0 f6834480 c01cead4 f6853fa0 00000400 b80cb000 > Call Trace: > [<f850d2fd>] acpi_ac_seq_show+0x12/0x5d [ac] > [<c01ab0e0>] seq_read+0x130/0x2e0 > [<c01aafb0>] seq_read+0x0/0x2e0 > [<c01cead4>] proc_reg_read+0x64/0xa0 > [<c01cea70>] proc_reg_read+0x0/0xa0 > [<c019346d>] vfs_read+0x9d/0x160 > [<c0193601>] sys_read+0x41/0x80 > [<c0103f13>] sysenter_do_call+0x12/0x33 > [<c0320000>] serial_pnp_probe+0x150/0x250 > Code: b8 ea ff ff ff 75 07 8b 43 5c 89 01 31 c0 5b c3 56 89 c6 85 f6 b8 ea ff ff ff 53 74 49 8b 5e 58 8d 46 5c 31 c9 50 ba 18 d4 50 f8 <8b> 03 e8 e0 be d2 c7 89 c2 58 31 c0 85 d2 74 2b 68 1d d4 50 f8 > EIP: [<f850d031>] acpi_ac_get_state+0x1b/0x59 [ac] SS:ESP 0068:f6853f0c > ---[ end trace eb12d69e27c56472 ]--- > I'm pretty sure that's a separate bug :-). As you say, it happens under different circumstances, it's a BUG as opposed to a hang, and it's in a different version (I didn't have my problem in 2.6.28). www.kerneloops.org says no-one else has reported your bug. So maybe you're right, and Arch have applied some patches which nobody else runs with. I don't know how to find Arch source packages, so I can't really tell. But the only _taint_ as such is due to the ath_hal module. Let's see, Arch linux... <http://wiki.archlinux.org/index.php/Udev#Blacklisting_Modules> describes how you can (reversibly) blacklist modules. If you blacklist ath_pci (and ath_hal too, just to make sure), you could boot without any taint and generate a "clean" backtrace. Regards Alan -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
