Messages in this thread |  | | | Date | Mon, 2 Jul 2012 11:46:07 -0700 (PDT) | | From | Christian Kujau <> | | Subject | Re: 3.5.0-rc5: BUG: soft lockup - CPU#0 stuck for 22s |
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On Mon, 2 Jul 2012 at 09:45, Paul E. McKenney wrote: > 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.
Great! When applied to -rc5 Li's patch fixes it for my powerpc UP system as well.
Tested-by: Christian Kujau <lists@nerdbynature.de>
Many 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
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