On Sun, Jul 01, 2012 at 11:30:40PM -0700, Christian Kujau wrote:
> On Mon, 2 Jul 2012 at 14:50, Benjamin Herrenschmidt wrote:
> > Interesting... I observed something roughly similar on a dual G4
> > the other day associated with a 30s to 1mn pause during boot. RCU
> > was complaining loudly.
> >
> > In my case, it did continue booting normally, is that the case for you ?
>
> No, in my case it stopped booting, though there was no "panic" message.
>
> > Also if I compile the kernel without CONFIG_SMP, it did go away as well,
> > do you observe that too ?
>
> This PoweBook G4 is UP anyway and I'm always building w/o CONFIG_SMP.
>
> > I don't have a spare cycle to investigate this problem this week I'm
> > afraid, it might help if you could try a bisection though.
>
> Yes, I've started a bisection already and will report back.
>
> FYI, I've put a netconsole-log below from another boot (in the
> middle of a bisection), the instruction dump is slightly more complete.
Li Zhong posted a patch to fix this (async_synchronize_full() below):
https://lkml.org/lkml/2012/7/2/32
This gets rid of this problem on my UP testing. If it works for you,
please give Li Zhong a Tested-by.
Thanx, Paul
> Thanks!
> Christian.
>
> [ 40.345973] BUG: soft lockup - CPU#0 stuck for 22s! [modprobe:691]
> [ 40.347737] Modules linked in: sd_mod arc4 firewire_sbp2 scsi_mod b43
> mac80211 cfg80211
> [ 40.349443] irq event stamp: 65779272
> [ 40.351156] hardirqs last enabled at (65779271): [<c052fae8>]
> _raw_spin_unlock_irqrestore+0x40/0x9c
> [ 40.352911] hardirqs last disabled at (65779272): [<c0011648>]
> reenable_mmu+0x40/0x98
> [ 40.354649] softirqs last enabled at (65769864): [<c000f3c0>]
> call_do_softirq+0x14/0x24
> [ 40.356386] softirqs last disabled at (65769857): [<c000f3c0>]
> call_do_softirq+0x14/0x24
> [ 40.358098] NIP: c005ee64 LR: c005ee54 CTR: c009c578
> [ 40.359788] REGS: eece3d70 TRAP: 0901 Not tainted (3.4.0-05609-gc80ddb5)
> [ 40.361517] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 24042482 XER: 00000000
> [ 40.363261] TASK = eec30b80[691] 'modprobe' THREAD: eece2000#012
> [ 40.363261] GPR00: c005ee54 eece3e20 eec30b80 00000000 00000002 c005edd0
> 00000000 00000000 #012
> [ 40.363261] GPR08: 00000000 eece2000 00000000 00000001 24042488
> [ 40.368310] NIP [c005ee64] async_synchronize_cookie_domain+0x70/0x1f4
> [ 40.369978] LR [c005ee54] async_synchronize_cookie_domain+0x60/0x1f4
> [ 40.371614] Call Trace:
> [ 40.373226] [eece3e20] [c005ee54]
> async_synchronize_cookie_domain+0x60/0x1f4 (unreliable)
> [ 40.374884] [eece3e70] [c005f034] async_synchronize_full+0x3c/0x74
> [ 40.376524] [eece3e90] [c0082790] sys_init_module+0x178/0x1164
> [ 40.378151] [eece3f40] [c00117a8] ret_from_syscall+0x0/0x38
> [ 40.379783] --- Exception: c01 at 0xff5d694#012[ 40.379783] LR =
> 0x100041c0
> [ 40.382928] Instruction dump:
> [ 40.384489] 93a10044 419e0014 3d20c06f 8009d020 2f800000 419e017c 7fc3f378
> 4bfffed9
> [ 40.386081] 7f9f1840 419d0060 7f9f1800 419e0050 <881bf008> 2f800000
> 419e0014 3d20c06f
>
>
> --
> BOFH excuse #241:
>
> _Rosin_ core solder? But...
> --
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