[uml-devel] 2.6.11 + uml.sf.net patches panic

[Peter <p.repliesignored@rimuhosting.com>]

Hi.  I'm getting a kernel panic on the 2.6.11 code from 
user-mode-linux.sf.net.

Details: host=2.6.8.1+skas3v8.  guest = 2.6.11 plus the 2.6.11-rc3-mm2 
tarball from user-mode-linux.sf.net minus x11-fb, cross-build (in order 
to get past a compile error).

The panic happens when starting up a Java process (specifically starting 
up tomcat).

The problem does not occur with a vanilla 2.6.11 guest.

I'm happy to carry on using vanilla 2.6.11.  But hopefully the stack 
trace below triggers some insight into a problem with one of the latest 
uml.sf.net patches.

Regards, Peter

Starting Tomcat: Kernel panic - not syncing: Kernel mode fault at addr 
0x98c1003f, ip 0x4013a3e4

EIP: 0073:[<4013a3e4>] CPU: 0 Not tainted ESP: 007b:4bc77eec EFLAGS: 
00000202
     Not tainted
EAX: ffffffda EBX: 00000001 ECX: 4bc77f14 EDX: 00000010
ESI: 000fffff EDI: 00000010 EBP: 4bc77fec DS: 007b ES: 007b
Call Trace:
1014b678:  [<0807ab26>] printk+0x12/0x14
1014b688:  [<08087826>] notifier_call_chain+0x22/0x40
1014b6b8:  [<0807a282>] panic+0x56/0x104
1014b6c8:  [<08063cff>] segv+0x7f/0x270
1014b6d8:  [<08063e5a>] segv+0x1da/0x270
1014b740:  [<08064070>] segv_handler+0x0/0xa8
1014b748:  [<0807235e>] change_signals+0x42/0x6c
1014b7b8:  [<08064114>] segv_handler+0xa4/0xa8
1014b7f0:  [<08064070>] segv_handler+0x0/0xa8
1014b7f8:  [<080668c1>] sig_handler_common_skas+0x8d/0xdc
1014b808:  [<080668ba>] sig_handler_common_skas+0x86/0xdc
1014b828:  [<0807212a>] sig_handler+0x12/0x14
1014b888:  [<08074d0e>] write_ldt+0x1a6/0x2d8
1014b8f0:  [<080617cb>] um_virt_to_phys+0x4b/0x84
1014b8f4:  [<080f3000>] journal_switch_revoke_table+0x50/0x60
1014b910:  [<080669aa>] maybe_map+0x26/0x84
1014b92c:  [<080f41e1>] journal_update_superblock+0x1d/0x9c
1014b940:  [<08066a5e>] do_op+0x56/0x60
1014b960:  [<08066ad3>] do_buffer_op+0x6b/0x134
1014b970:  [<08066bf0>] copy_chunk_from_user+0x0/0x2c
1014b990:  [<08066bf0>] copy_chunk_from_user+0x0/0x2c
1014b9b0:  [<0807390d>] setjmp_wrapper+0x4d/0x54


[root@fc3 ~]# /etc/init.d/tomcat start
Starting Tomcat: Kernel panic - not syncing: Kernel mode fault at addr 
0x98c1003f, ip 0x4013a3e4

EIP: 0073:[<4013a3e4>] CPU: 0 Not tainted ESP: 007b:4bc77eec EFLAGS: 
00000202
     Not tainted
EAX: ffffffda EBX: 00000001 ECX: 4bc77f14 EDX: 00000010
ESI: 000fffff EDI: 00000010 EBP: 4bc77fec DS: 007b ES: 007b
Call Trace:
1028f678:  [<0807ab26>] printk+0x12/0x14
1028f688:  [<08087826>] notifier_call_chain+0x22/0x40
1028f6b8:  [<0807a282>] panic+0x56/0x104
1028f6c8:  [<08063cff>] segv+0x7f/0x270
1028f6d8:  [<08063e5a>] segv+0x1da/0x270
1028f740:  [<08064070>] segv_handler+0x0/0xa8
1028f748:  [<0807235e>] change_signals+0x42/0x6c
1028f7b8:  [<08064114>] segv_handler+0xa4/0xa8
1028f7f0:  [<08064070>] segv_handler+0x0/0xa8
1028f7f8:  [<080668c1>] sig_handler_common_skas+0x8d/0xdc
1028f808:  [<080668ba>] sig_handler_common_skas+0x86/0xdc
1028f828:  [<0807212a>] sig_handler+0x12/0x14
1028f888:  [<08074d0e>] write_ldt+0x1a6/0x2d8
1028f8f0:  [<080617cb>] um_virt_to_phys+0x4b/0x84
1028f8f4:  [<08234000>] ip6_mc_del_src+0xd4/0x19c
1028f910:  [<080669aa>] maybe_map+0x26/0x84
1028f92c:  [<082351e1>] igmp6_mcf_seq_show+0x189/0x1c4
1028f940:  [<08066a5e>] do_op+0x56/0x60
1028f960:  [<08066ad3>] do_buffer_op+0x6b/0x134
1028f970:  [<08066bf0>] copy_chunk_from_user+0x0/0x2c
1028f990:  [<08066bf0>] copy_chunk_from_user+0x0/0x2c
1028f9b0:  [<0807390d>] setjmp_wrapper+0x4d/0x54



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