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
[EMAIL PROTECTED] ~]# /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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