Bug 463421

Created attachment 317462 [details]
dmidecode

Description of problem:
I have seen machines could hung forever here,

Unmounting pipe file systems:  
Unmounting file systems:  
Please stand by while rebooting the system...
md: stopping all md devices.
md: md0 switched to read-only mode.
Synchronizing SCSI cache for disk sda: 
Restarting system.

I have seen it on both UP and SMP Kernels.

I have also tried the following parameters without luck,

reboot=a
reboot=k
reboot=t (always hang)
reboot=b (always panic. A bug?)

Turning off quotas:  
Unmounting pipe file systems:  
Unmounting file systems:  
Please stand by while rebooting the system...
md: stopping all md devices.
md: md0 switched to read-only mode.
Synchronizing SCSI cache for disk sda: 
Restarting system.
warm reboot
general protection fault: 0000 [1] 
CPU 0 
Modules linked in: md5 ipv6 parport_pc lp parport autofs4 sunrpc cpufreq_powersave loop button battery ac ohci_hcd ehci_hcd tg3 floppy dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod sata_svw libata mptscsih mptsas mptspi mptscsi mptbase sd_mod scsi_mod
Pid: 4067, comm: reboot Not tainted 2.6.9-78.0.1.EL
RIP: 0010:[<ffffffff80119338>] <ffffffff80119338>{machine_restart+248}
RSP: 0018:000001022b7f1e20  EFLAGS: 00010006
RAX: 00000000000006e0 RBX: 0000000000001000 RCX: 0000000000000000
RDX: 0000000000000660 RSI: ffffffff80119427 RDI: 0000010000001087
RBP: 0000000001234567 R08: 00000000000927bf R09: 00000000000927c0
R10: 0000000000000246 R11: 0000ffff8046b980 R12: 00000000fee1dead
R13: 0000000000000008 R14: 0000000000000001 R15: 0000000000000000
FS:  0000002a95561b00(0000) GS:ffffffff80573b00(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000003241ac1f50 CR3: 0000000000101000 CR4: 00000000000006e0
Process reboot (pid: 4067, threadinfo 000001022b7f0000, task 000001022ffea230)
Stack: 0000000000001000 0000000000000008 0000000000000006 0000000000002000 
       0000000000000000 0000000028121969 ffffffff8014e620 0000000000000246 
       ffffffff802ffc8c 0000003241ac1f50 
Call Trace:<ffffffff8014e620>{sys_reboot+871} <ffffffff802ffc8c>{lock_sock+599} 
       <ffffffff80125da1>{do_page_fault+577} <ffffffff801ad52e>{dput+56} 
       <ffffffff8019178a>{__fput+257} <ffffffff8018fd1b>{filp_close+103} 
       <ffffffff80110b5a>{system_call+126} 

Code: 48 cf 31 db 31 d2 e4 64 e6 80 a8 02 74 0a ff c2 81 fa ff ff 
RIP <ffffffff80119338>{machine_restart+248} RSP <000001022b7f1e20>
 <0>Kernel panic - not syncing: Oops

Version-Release number of selected component (if applicable):
kernel-2.6.9-78.0.1.EL

How reproducible:
I could reproduced it on amd-shanghai-01.rhts.bos.redhat.com. I have seen some other machines failed repetitive reboot test as well. I am not sure if they are the same thing,

http://rhts.redhat.com/cgi-bin/rhts/test_log.cgi?id=4395967
http://rhts.redhat.com/cgi-bin/rhts/test_log.cgi?id=4396074

Steps to Reproduce:
1. reserve amd-shanghai-01.rhts.bos.redhat.com from RHTS.
2. crontab cron
   === cron ===
   @reboot echo 1 >>/root/reboot-count; sleep 60; reboot
  
Actual results:
The machine would hung after around 20-40 reboots.