Subject: Re: linux-next: OOPS at boot time

From: Andrew Morton <[email-masked]>
Date: Tue, 20 Jul 2010 03:36:56 -0700

On Tue, 20 Jul 2010 16:41:45 +1000 Stephen Rothwell <[email-masked]> wrote:

> Hi Al,
> 
> All of my PowerPC boot tests are getting this after getting to user mode
> (sometimes several times):
> 
> ------------[ cut here ]------------
> kernel BUG at fs/inode.c:1244!
> Oops: Exception in kernel mode, sig: 5 [#1]
> SMP NR_CPUS=128 NUMA pSeries
> last sysfs file: /sys/kernel/uevent_seqnum
> Modules linked in: ehea xt_tcpudp iptable_filter ip_tables nfnetlink nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT x_tables dm_mirror dm_region_hash dm_log dm_zero dm_snapshot parport_pc parport dm_multipath autofs4
> NIP: c000000000168074 LR: c000000000168064 CTR: 0000000000000000
> REGS: c0000000063d39f0 TRAP: 0700   Not tainted  (2.6.35-rc5-autokern1)
> MSR: 8000000000029032 <EE,ME,CE,IR,DR>  CR: 22008422  XER: 20000001
> TASK = c000000003a25840[4995] 'rm' THREAD: c0000000063d0000 CPU: 2
> GPR00: 0000000000000001 c0000000063d3c70 c000000000bfdea0 c0000000015f2090 
> GPR04: 0000000000000003 0000000000000001 c0000000063d3bd0 c000000000c5a388 
> GPR08: 80c0000000000000 0000000000000006 6000000000000000 8000000000000000 
> GPR12: c0000000056c0598 c0000000074d6400 0000000003100000 0000000000779b68 
> GPR16: 00000000007782f0 0000000010018875 00000000ff9c74b8 0000000000000000 
> GPR20: 0000000000000000 0000000000000000 0000000010010000 0000000010010000 
> GPR24: 0000000000000001 00000000fffba994 0000000000000002 000000001001a038 
> GPR28: c000000006617800 c000000000aefd40 c000000000b586b8 c0000000056c0748 
> NIP [c000000000168074] .iput+0x288/0x2d0
> LR [c000000000168064] .iput+0x278/0x2d0
> Call Trace:
> [c0000000063d3c70] [c000000000168064] .iput+0x278/0x2d0 (unreliable)
> [c0000000063d3d00] [c00000000015e964] .do_unlinkat+0x124/0x1b8
> [c0000000063d3e30] [c000000000008554] syscall_exit+0x0/0x40
> Instruction dump:
> 38000000 f81f0008 f81f0000 e87e8090 48457d8d 60000000 7fe3fb78 4bfff339 
> e81f03b0 68000060 3120ffff 7c090110 <0b000000> 38210090 7fe3fb78 e8010010 
> ---[ end trace 9ace9d3884bc0aac ]---
> Trace/breakpoint trap
> ------------[ cut here ]------------
> 
> This is:
> 	BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
> in iput_final().
> 
> That BUG_ON was added by commit c0ae81f2 ("Make ->drop_inode() just
> return whether inode needs to be dropped").
> 
> Has anyone seen this or something similar?

I get it all the time.  See the thread "Subject: Re: linux-next: Tree for
July 7".