Here's some debugging output. I booted domU with an older kernel to be able to install
On opensuse dom0 I ran sudo gdbserver-xen 127.0.0.1:9999 --attach 37 where 37 is domid printed by xm list and then used sudo gdb /local/lindi/vmlinux-2.6.32-5-amd64 (gdb) target remote 127.0.0.1:9999 to start the debugger. It seems that the kernel is stuck trying to print information about a kernel OOPS: (gdb) info threads * 1 Remote target 0xffffffff812f8c78 in __ticket_spin_lock ( lock=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/include/asm/spinlock.h:114 (gdb) bt full #0 0xffffffff812f8c78 in __ticket_spin_lock (lock=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/include/asm/spinlock.h:114 inc = 1 tmp = 0 #1 __raw_spin_lock (lock=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/include/asm/spinlock.h:190 No locals. #2 __spin_lock (lock=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/include/linux/spinlock_api_smp.h:337 No locals. #3 _spin_lock (lock=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/kernel/spinlock.c:138 No locals. #4 0xffffffff8104d344 in vprintk ( fmt=0xffffffff813a8798 "<1>BUG: unable to handle kernel ", args=0xffff88003fdb93a8) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/kernel/printk.c:705 printed_len = 0 current_log_level = 4 flags = 0 p = <value optimized out> #5 0xffffffff812f6eec in printk (fmt=0xffffffff815d13c0 "") at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/kernel/printk.c:595 ---Type <return> to continue, or q <return> to quit--- args = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 0xffff88003fdb9488, reg_save_area = 0xffff88003fdb93c8}} r = 1 #6 0xffffffff810311b0 in show_fault_oops (address=<value optimized out>, error_code=<value optimized out>, regs=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/mm/fault.c:583 No locals. #7 no_context (address=<value optimized out>, error_code=<value optimized out>, regs=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/mm/fault.c:658 tsk = 0xffff88003fdb4000 flags = 0 sig = <value optimized out> #8 0xffffffff81031429 in __bad_area_nosemaphore (regs=0xffff88003fdb9598, error_code=<value optimized out>, address=18446744071582043416, si_code=196609) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/mm/fault.c:741 tsk = 0xffff88003fdb4000 #9 0xffffffff812f9015 in ?? () at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/kernel/entry_64.S:1383 No locals. #10 0x0005398d646e415d in ?? () No symbol table info available. #11 0x00000000d5de35ab in ?? () ---Type <return> to continue, or q <return> to quit--- No symbol table info available. #12 0x0000000000000002 in ?? () No symbol table info available. #13 0x000c82198774ef00 in ?? () No symbol table info available. #14 0x0000000000000001 in ?? () No symbol table info available. #15 0xffff8800032e6040 in ?? () No symbol table info available. #16 0x0000000000000202 in ?? () No symbol table info available. #17 0xffff880000000000 in ?? () No symbol table info available. #18 0xffffffff813a87b8 in ?? () __kcrctab_unregister_net_sysctl_table = 2623496682 __kstrtab_unregister_net_sysctl_table = "unregister_net_sysctl_table" net_sysctl_ro_root = {root_list = {next = 0xffffffff814649b0, prev = 0xffffffff814a6350}, default_set = {list = { next = 0xffff88003fe34c08, prev = 0xffff88003d8dd808}, parent = 0xffffffff814649c0, is_seen = 0}, lookup = 0, permissions = 0xffffffff812e4313 <net_ctl_ro_header_perms>} sysctl_pernet_ops = {list = {next = 0xffffffff8149bcc0, prev = 0xffffffff814a6140}, init = 0xffffffff812e4323 <sysctl_net_init>, exit = 0xffffffff812e4375 <sysctl_net_exit>} __ksymtab_register_net_sysctl_table = {value = 18446744071581877167, name = 0xffffffff81422f46 "register_net_sysctl_table"} __kstrtab_register_net_sysctl_table = "register_net_sysctl_table" __initcall_sysctl_init4 = 0 ---Type <return> to continue, or q <return> to quit--- __kcrctab_register_net_sysctl_table = 829491708 __ksymtab_register_net_sysctl_rotable = {value = 18446744071581877142, name = 0xffffffff81422f2a "register_net_sysctl_rotable"} __ksymtab_unregister_net_sysctl_table = {value = 18446744071581877137, name = 0xffffffff81422f0e "unregister_net_sysctl_table"} net_sysctl_root = {root_list = {next = 0xffffffff814a6390, prev = 0xffffffff814649b0}, default_set = {list = {next = 0x0, prev = 0x0}, parent = 0x0, is_seen = 0}, lookup = 0xffffffff812e42e8 <net_ctl_header_lookup>, permissions = 0xffffffff812e4342 <net_ctl_permissions>} __kcrctab_register_net_sysctl_rotable = 2528268687 __kstrtab_register_net_sysctl_rotable = "register_net_sysctl_rotable" #19 0x0000000000000020 in ?? () No symbol table info available. #20 0x0005398d90ee1210 in ?? () No symbol table info available. #21 0x00000000f2572b01 in ?? () No symbol table info available. #22 0x0005398d9113c2e5 in ?? () No symbol table info available. #23 0xffffffff813a87b8 in ?? () __kcrctab_unregister_net_sysctl_table = 2623496682 __kstrtab_unregister_net_sysctl_table = "unregister_net_sysctl_table" net_sysctl_ro_root = {root_list = {next = 0xffffffff814649b0, prev = 0xffffffff814a6350}, default_set = {list = { next = 0xffff88003fe34c08, prev = 0xffff88003d8dd808}, parent = 0xffffffff814649c0, is_seen = 0}, lookup = 0, permissions = 0xffffffff812e4313 <net_ctl_ro_header_perms>} sysctl_pernet_ops = {list = {next = 0xffffffff8149bcc0, ---Type <return> to continue, or q <return> to quit--- prev = 0xffffffff814a6140}, init = 0xffffffff812e4323 <sysctl_net_init>, exit = 0xffffffff812e4375 <sysctl_net_exit>} __ksymtab_register_net_sysctl_table = {value = 18446744071581877167, name = 0xffffffff81422f46 "register_net_sysctl_table"} __kstrtab_register_net_sysctl_table = "register_net_sysctl_table" __initcall_sysctl_init4 = 0 __kcrctab_register_net_sysctl_table = 829491708 __ksymtab_register_net_sysctl_rotable = {value = 18446744071581877142, name = 0xffffffff81422f2a "register_net_sysctl_rotable"} __ksymtab_unregister_net_sysctl_table = {value = 18446744071581877137, name = 0xffffffff81422f0e "unregister_net_sysctl_table"} net_sysctl_root = {root_list = {next = 0xffffffff814a6390, prev = 0xffffffff814649b0}, default_set = {list = {next = 0x0, prev = 0x0}, parent = 0x0, is_seen = 0}, lookup = 0xffffffff812e42e8 <net_ctl_header_lookup>, permissions = 0xffffffff812e4342 <net_ctl_permissions>} __kcrctab_register_net_sysctl_rotable = 2528268687 __kstrtab_register_net_sysctl_rotable = "register_net_sysctl_rotable" #24 0xffff8800032e6040 in ?? () No symbol table info available. #25 0xffffffffffffffff in ?? () No symbol table info available. #26 0xffffffff8102bddf in pvclock_clocksource_read (src=0x1) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/kernel/pvclock.c:145 ret = 0 offset = <value optimized out> last = 1 ---Type <return> to continue, or q <return> to quit--- #27 0x0000000000000000 in ?? () No symbol table info available. I think we should figure out what caused the OOPS so the following information about the printk() being stuck is not important: (gdb) x/10i $rip 0xffffffff812f8c78 <__ticket_spin_lock+21>: movzwl (%rdi),%edx 0xffffffff812f8c7b <__ticket_spin_lock+24>: jmp 0xffffffff812f8c72 <__ticket_spin_lock+15> 0xffffffff812f8c7d <_spin_lock+26>: retq 0xffffffff812f8c7e <__raw_write_lock>: subl $0x1000000,%ds:(%rdi) 0xffffffff812f8c85 <__raw_write_lock+7>: je 0xffffffff812f8c8c <_write_lock+14> 0xffffffff812f8c87 <__raw_write_lock+9>: callq 0xffffffff81193b80 0xffffffff812f8c8c <_write_lock+14>: retq 0xffffffff812f8c8d <__ticket_spin_unlock>: incw (%rdi) 0xffffffff812f8c90 <raw_local_irq_restore>: mov %rsi,%rdi 0xffffffff812f8c93 <raw_local_irq_restore+3>: callq *0xffffffff814629b8 (gdb) si 0xffffffff812f8c7b 114 asm volatile(LOCK_PREFIX "xaddl %0, %1\n" (gdb) si 0xffffffff812f8c72 114 asm volatile(LOCK_PREFIX "xaddl %0, %1\n" (gdb) x/10i $rip 0xffffffff812f8c72 <__ticket_spin_lock+15>: cmp %eax,%edx 0xffffffff812f8c74 <__ticket_spin_lock+17>: je 0xffffffff812f8c7d <_spin_lock+26> 0xffffffff812f8c76 <__ticket_spin_lock+19>: pause 0xffffffff812f8c78 <__ticket_spin_lock+21>: movzwl (%rdi),%edx 0xffffffff812f8c7b <__ticket_spin_lock+24>: jmp 0xffffffff812f8c72 <__ticket_spin_lock+15> 0xffffffff812f8c7d <_spin_lock+26>: retq 0xffffffff812f8c7e <__raw_write_lock>: subl $0x1000000,%ds:(%rdi) 0xffffffff812f8c85 <__raw_write_lock+7>: je 0xffffffff812f8c8c <_write_lock+14> 0xffffffff812f8c87 <__raw_write_lock+9>: callq 0xffffffff81193b80 0xffffffff812f8c8c <_write_lock+14>: retq (gdb) info register rax 0x1 1 rbx 0x0 0 rcx 0xfffedb34 4294892340 rdx 0x0 0 rsi 0xffff88003fdb93a8 -131940323978328 rdi 0xffffffff815d13c0 -2124606528 rbp 0xffff88003fdb93a8 0xffff88003fdb93a8 rsp 0xffff88003fdb92f0 0xffff88003fdb92f0 r8 0x2 2 r9 0xffff88003fdb4000 -131940323999744 r10 0xffff880000000000 -131941395333120 r11 0x202 514 r12 0xffffffff813a8798 -2126870632 r13 0x4 4 r14 0x3 3 r15 0x0 0 rip 0xffffffff812f8c72 0xffffffff812f8c72 <__ticket_spin_lock+15> eflags 0x1397 [ CF PF AF SF TF IF #12 ] cs 0xe033 57395 ss 0xe02b 57387 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 fctrl 0x37f 895 fstat 0x0 0 ftag 0xffff 65535 fiseg 0x0 0 ---Type <return> to continue, or q <return> to quit--- fioff 0x0 0 foseg 0x0 0 fooff 0x0 0 fop 0x0 0 mxcsr 0x1f80 [ IM DM ZM OM UM PM ] (gdb) However, why did the kernel OOPS in the first place? (gdb) frame 7 #7 no_context (address=<value optimized out>, error_code=<value optimized out>, regs=<value optimized out>) at /build/buildd-linux-2.6_2.6.32-17-amd64-FO3n8v/linux-2.6-2.6.32/debian/build/source_amd64_none/arch/x86/mm/fault.c:658 658 show_fault_oops(regs, error_code, address); (gdb) p/x *regs $10 = {r15 = 0x5398d646e415d, r14 = 0xd5de35ab, r13 = 0x2, r12 = 0xc82198774ef00, bp = 0x1, bx = 0xffff8800032e6040, r11 = 0x202, r10 = 0xffff880000000000, r9 = 0xffffffff813a87b8, r8 = 0x20, ax = 0x5398d90ee1210, cx = 0xf2572b01, dx = 0x5398d9113c2e5, si = 0xffffffff813a87b8, di = 0xffff8800032e6040, orig_ax = 0xffffffffffffffff, ip = 0xffffffff8102bddf, cs = 0x10000e030, flags = 0x10002, sp = 0xffff88003fdb9640, ss = 0xe02b} (gdb) p error_code $11 = 3 (gdb) p/x address $22 = 0xffffffff8130cd18 (gdb) x/6i regs->ip 0xffffffff8102bddf <__cmpxchg>: cmpxchg %rdx,%ds:0x2e0f30(%rip) # 0xffffffff8130cd18 0xffffffff8102bde8 <pvclock_clocksource_read+122>: cmp %rdx,%rax 0xffffffff8102bdeb <pvclock_clocksource_read+125>: jne 0xffffffff8102bdda <pvclock_clocksource_read+108> 0xffffffff8102bded <pvclock_clocksource_read+127>: pop %rcx 0xffffffff8102bdee <pvclock_clocksource_read+128>: pop %rbx 0xffffffff8102bdef <pvclock_clocksource_read+129>: pop %rbp (gdb) shell objdump -axdt /local/lindi/vmlinux-2.6.32-5-amd64 | grep ffffffff8130cd18 ffffffff8130cd18 l O .rodata 0000000000000008 last_value ffffffff8102bdd3: 48 8b 05 3e 0f 2e 00 mov 0x2e0f3e(%rip),%rax # ffffffff8130cd18 <last_value> ffffffff8102bddf: f0 48 0f b1 15 30 0f lock cmpxchg %rdx,0x2e0f30(%rip) # ffffffff8130cd18 <last_value> -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org