Subject: Re: 2.6.31-git5 kernel boot hangs on powerpc

From: Sachin Sant <[email-masked]>
Date: Wed, 23 Sep 2009 13:53:08 +0530

Sachin Sant wrote:
> Sachin Sant wrote:
>> Tejun Heo wrote:
>>> Ah... sorry about that.  Sachin, is it possible for you to build the
>>> kernel with debug info and ask gdb where the stalling NIP is in the c
>>> file?
>>>   
>> <6>NET: Registered protocol family 10
>> <3>BUG: soft lockup - CPU#2 stuck for 61s! [modprobe:1865]
>> <4>Modules linked in: ipv6(+) fuse loop dm_mod sg sd_mod crc_t10dif 
>> ibmvscsic scsi_transport_srp scsi_tgt scsi_mod
>> <4>NIP: c00000000004198c LR: c00000000015dac8 CTR: 0000000000000040
>> <4>REGS: c0000000fbdbb6f0 TRAP: 0901   Not tainted  (2.6.31-git5)
>> <4>MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 44224420  XER: 20000001
>> <4>TASK = c0000000fbd57840[1865] 'modprobe' THREAD: c0000000fbdb8000 
>> CPU: 2
>> <4>GPR00: 0000000000000040 c0000000fbdbb970 c000000000a96d08 
>> d00007fffff00000
>> <4>GPR04: 0000000000000000 0000000000000000 d00007fffff00000 
>> d00007fffff00000
>> <4>GPR08: 0000000000000000 c000000001020180 c000000000b6b4e8 
>> 00000000000003c0
>> <4>GPR12: 0000000048224428 c000000000b82a00
>> <4>NIP [c00000000004198c] .memset+0x60/0xfc
>> <4>LR [c00000000015dac8] .pcpu_alloc+0x758/0x960
>> <4>Call Trace:
>> <4>[c0000000fbdbb970] [c00000000015da58] .pcpu_alloc+0x6e8/0x960 
>> (unreliable)
>> <4>[c0000000fbdbba90] [c000000000565664] .snmp_mib_init+0x34/0x9c
>> <4>[c0000000fbdbbb20] [d00000000212e130] .ipv6_add_dev+0x1cc/0x3dc 
>> [ipv6]
>> <4>[c0000000fbdbbbc0] [d0000000021598ac] .addrconf_init+0x6c/0x194 
>> [ipv6]
>> <4>[c0000000fbdbbc50] [d00000000215967c] .inet6_init+0x1bc/0x34c [ipv6]
>> <4>[c0000000fbdbbce0] [c0000000000097a4] .do_one_initcall+0x88/0x1bc
>> <4>[c0000000fbdbbd90] [c0000000000c84dc] .SyS_init_module+0x11c/0x29c
>> <4>[c0000000fbdbbe30] [c0000000000085b4] syscall_exit+0x0/0x40
>> <4>Instruction dump:
>> <4>98860000 38c60001 409e000c b0860000 38c60002 409d000c 90860000 
>> 38c60004
>> <4>78a0d183 78a506a0 7c0903a6 4182002c <f8860000> f8860008 f8860010 
>> f8860018
> Latest git (2.6.31-git9:78f28b7c555359c67c2a0d23f7436e915329421e)
> still has this bug. 
One workaround i have found for this problem is to disable IPv6.
With IPv6 disabled the machine boots OK. Till a reliable solution
is available for this issue, i will keep IPv6 disabled in my configs.

Thanks
-Sachin

-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------