Changes between Version 3 and Version 4 of TipAndDoc/VM/NestedVMM/GDB


Ignore:
Timestamp:
Jul 11, 2013 11:44:14 PM (12 years ago)
Author:
mitty
Comment:

--

Legend:

Unmodified
Added
Removed
Modified

  • TipAndDoc/VM/NestedVMM/GDB

    v3 v4  
    3030   * QEMU Virtual CPU version 1.2.0 
    3131   * Ubuntu 12.10 3.5.1 x86_64 
     32 
     33 * getpid.c 
     34{{{#!cc 
     35#include <stdio.h> 
     36#include <sys/types.h> 
     37#include <unistd.h> 
     38 
     39int main() { 
     40    printf ("%d\n", getpid()); 
     41     
     42    return 0; 
     43} 
     44}}} 
     45 
     46 * case1 
     47  * gdb attach L0 => L2 
     48   * mitty@quantal-l0:~/works/linux-3.5.1$ gdb 
     49{{{ 
     50(gdb) file vmlinux 
     51Reading symbols from /home/mitty/works/linux-3.5.1/vmlinux...done. 
     52(gdb) b sys_getpid 
     53Breakpoint 1 at 0xffffffff81064070: file kernel/timer.c, line 1414. 
     54(gdb) target remote 192.168.XX.223:1234 
     55Remote debugging using 192.168.XX.223:1234 
     56native_safe_halt () 
     57    at /home/mitty/works/linux-3.5.1/arch/x86/include/asm/irqflags.h:50 
     5850      } 
     59(gdb) c 
     60Continuing. 
     61}}} 
     62   * kern.log 
     63{{{ 
     64Jul 11 23:31:00 quantal-nested kernel: [ 1877.578453] int3: 0000 [#1] SMP  
     65Jul 11 23:31:00 quantal-nested kernel: [ 1877.591921] CPU 0  
     66Jul 11 23:31:00 quantal-nested kernel: [ 1877.594478] Modules linked in: kvm_intel kvm ppdev psmouse microcode parport_pc serio_raw i2c_piix4 mac_hid lp parport floppy 8139too 8139cp 
     67Jul 11 23:31:00 quantal-nested kernel: [ 1877.614280]  
     68Jul 11 23:31:00 quantal-nested kernel: [ 1877.616880] Pid: 946, comm: getpid Not tainted 3.5.1 #1 Bochs Bochs 
     69Jul 11 23:31:00 quantal-nested kernel: [ 1877.622425] RIP: 0010:[<ffffffff81064071>]  [<ffffffff81064071>] sys_getpid+0x1/0x30 
     70Jul 11 23:31:00 quantal-nested kernel: [ 1877.629986] RSP: 0018:ffff88003cfa5f80  EFLAGS: 00010293 
     71Jul 11 23:31:00 quantal-nested kernel: [ 1877.634137] RAX: 0000000000000027 RBX: 0000000000000000 RCX: 00007fffb9729930 
     72Jul 11 23:31:00 quantal-nested kernel: [ 1877.638935] RDX: 0000000000000000 RSI: 00007fffb9729c88 RDI: 0000000000000001 
     73Jul 11 23:31:00 quantal-nested kernel: [ 1877.643660] RBP: 00007fffb9729ba0 R08: 0000000000400610 R09: 00007f664da39750 
     74Jul 11 23:31:00 quantal-nested kernel: [ 1877.648427] R10: 00007fffb9729930 R11: 0000000000000246 R12: 0000000000400450 
     75Jul 11 23:31:00 quantal-nested kernel: [ 1877.652946] R13: 00007fffb9729c80 R14: 0000000000000000 R15: 0000000000000000 
     76Jul 11 23:31:00 quantal-nested kernel: [ 1877.657537] FS:  00007f664dc42700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 
     77Jul 11 23:31:00 quantal-nested kernel: [ 1877.664543] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 
     78Jul 11 23:31:00 quantal-nested kernel: [ 1877.668770] CR2: 00007f664d72b6d0 CR3: 000000001921f000 CR4: 00000000000006f0 
     79Jul 11 23:31:00 quantal-nested kernel: [ 1877.673353] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
     80Jul 11 23:31:00 quantal-nested kernel: [ 1877.678072] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 
     81Jul 11 23:31:00 quantal-nested kernel: [ 1877.682699] Process getpid (pid: 946, threadinfo ffff88003cfa4000, task ffff88003da44500) 
     82Jul 11 23:31:00 quantal-nested kernel: [ 1877.693357] Stack: 
     83Jul 11 23:31:00 quantal-nested kernel: [ 1877.696519]  ffffffff816812e9 0000000000000246 00007fffb9729930 00007f664da39750 
     84Jul 11 23:31:00 quantal-nested kernel: [ 1877.705634]  0000000000400610 0000000000000027 0000000000400580 0000000000000000 
     85Jul 11 23:31:00 quantal-nested kernel: [ 1877.714651]  00007fffb9729c88 0000000000000001 0000000000000027 00007f664d72b6f9 
     86Jul 11 23:31:00 quantal-nested kernel: [ 1877.724455] Call Trace: 
     87Jul 11 23:31:00 quantal-nested kernel: [ 1877.727731]  [<ffffffff816812e9>] ? system_call_fastpath+0x16/0x1b 
     88Jul 11 23:31:00 quantal-nested kernel: [ 1877.732259] Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 66 66 66 66 90 e8 c2 4d ff ff 5d 89 c0 c3 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 cc <48> 89 e5 66 66 66 66 90 65 48 8b 04 25 00 c7 00 00 48 8b 80 f0  
     89Jul 11 23:31:00 quantal-nested kernel: [ 1877.792020] RIP  [<ffffffff81064071>] sys_getpid+0x1/0x30 
     90Jul 11 23:31:00 quantal-nested kernel: [ 1877.797667]  RSP <ffff88003cfa5f80> 
     91Jul 11 23:31:00 quantal-nested kernel: [ 1877.801729] ---[ end trace 626ed62bf5aa88ab ]--- 
     92Jul 11 23:31:00 quantal-nested kernel: [ 1877.806097] BUG: scheduling while atomic: getpid/946/0x10000001 
     93Jul 11 23:31:00 quantal-nested kernel: [ 1877.810788] Modules linked in: kvm_intel kvm ppdev psmouse microcode parport_pc serio_raw i2c_piix4 mac_hid lp parport floppy 8139too 8139cp 
     94Jul 11 23:31:00 quantal-nested kernel: [ 1877.827458] Pid: 946, comm: getpid Tainted: G      D      3.5.1 #1 
     95Jul 11 23:31:00 quantal-nested kernel: [ 1877.832034] Call Trace: 
     96Jul 11 23:31:00 quantal-nested kernel: [ 1877.835138]  <#DB>  [<ffffffff8166e564>] __schedule_bug+0x4d/0x59 
     97Jul 11 23:31:00 quantal-nested kernel: [ 1877.839978]  [<ffffffff81677d34>] __schedule+0x6e4/0x7c0 
     98Jul 11 23:31:00 quantal-nested kernel: [ 1877.844322]  [<ffffffff81084b4a>] __cond_resched+0x2a/0x40 
     99Jul 11 23:31:00 quantal-nested kernel: [ 1877.848360]  [<ffffffff81677e90>] _cond_resched+0x30/0x40 
     100Jul 11 23:31:00 quantal-nested kernel: [ 1877.852387]  [<ffffffff81677326>] down_read+0x16/0x2b 
     101Jul 11 23:31:00 quantal-nested kernel: [ 1877.856313]  [<ffffffff810681cb>] exit_signals+0x2b/0x130 
     102Jul 11 23:31:00 quantal-nested kernel: [ 1877.860322]  [<ffffffff8107c3e6>] ? blocking_notifier_call_chain+0x16/0x20 
     103Jul 11 23:31:00 quantal-nested kernel: [ 1877.864782]  [<ffffffff810577b4>] do_exit+0xb4/0x8e0 
     104Jul 11 23:31:00 quantal-nested kernel: [ 1877.868730]  [<ffffffff8166dfe0>] ? printk+0x61/0x63 
     105Jul 11 23:31:00 quantal-nested kernel: [ 1877.873228]  [<ffffffff8167a334>] oops_end+0xa4/0xf0 
     106Jul 11 23:31:00 quantal-nested kernel: [ 1877.877232]  [<ffffffff810166b8>] die+0x58/0x90 
     107Jul 11 23:31:00 quantal-nested kernel: [ 1877.881063]  [<ffffffff81679c40>] do_trap+0xc0/0x170 
     108Jul 11 23:31:00 quantal-nested kernel: [ 1877.885899]  [<ffffffff81679f39>] do_int3+0xd9/0x130 
     109Jul 11 23:31:00 quantal-nested kernel: [ 1877.889902]  [<ffffffff81679698>] int3+0x28/0x40 
     110Jul 11 23:31:00 quantal-nested kernel: [ 1877.893805]  [<ffffffff81064071>] ? sys_getpid+0x1/0x30 
     111Jul 11 23:31:00 quantal-nested kernel: [ 1877.897890]  <<EOE>>  [<ffffffff816812e9>] ? system_call_fastpath+0x16/0x1b 
     112Jul 11 23:31:00 quantal-nested kernel: [ 1877.903220] note: getpid[946] exited with preempt_count 1 
     113Jul 11 23:31:00 quantal-nested kernel: [ 1877.907471] BUG: scheduling while atomic: getpid/946/0x10000001 
     114Jul 11 23:31:00 quantal-nested kernel: [ 1877.915076] Modules linked in: kvm_intel kvm ppdev psmouse microcode parport_pc serio_raw i2c_piix4 mac_hid lp parport floppy 8139too 8139cp 
     115Jul 11 23:31:00 quantal-nested kernel: [ 1877.933729] Pid: 946, comm: getpid Tainted: G      D W    3.5.1 #1 
     116Jul 11 23:31:00 quantal-nested kernel: [ 1877.938159] Call Trace: 
     117Jul 11 23:31:00 quantal-nested kernel: [ 1877.941419]  <#DB>  [<ffffffff8166e564>] __schedule_bug+0x4d/0x59 
     118Jul 11 23:31:00 quantal-nested kernel: [ 1877.946391]  [<ffffffff81677d34>] __schedule+0x6e4/0x7c0 
     119Jul 11 23:31:00 quantal-nested kernel: [ 1877.950571]  [<ffffffff81084b4a>] __cond_resched+0x2a/0x40 
     120Jul 11 23:31:00 quantal-nested kernel: [ 1877.954840]  [<ffffffff81677e90>] _cond_resched+0x30/0x40 
     121Jul 11 23:31:00 quantal-nested kernel: [ 1877.959065]  [<ffffffff81677326>] down_read+0x16/0x2b 
     122Jul 11 23:31:00 quantal-nested kernel: [ 1877.963238]  [<ffffffff810b7acb>] acct_collect+0x4b/0x1c0 
     123Jul 11 23:31:00 quantal-nested kernel: [ 1877.967488]  [<ffffffff81057d83>] do_exit+0x683/0x8e0 
     124Jul 11 23:31:00 quantal-nested kernel: [ 1877.971680]  [<ffffffff8167a334>] oops_end+0xa4/0xf0 
     125Jul 11 23:31:00 quantal-nested kernel: [ 1877.975844]  [<ffffffff810166b8>] die+0x58/0x90 
     126Jul 11 23:31:00 quantal-nested kernel: [ 1877.979899]  [<ffffffff81679c40>] do_trap+0xc0/0x170 
     127Jul 11 23:31:00 quantal-nested kernel: [ 1877.984131]  [<ffffffff81679f39>] do_int3+0xd9/0x130 
     128Jul 11 23:31:00 quantal-nested kernel: [ 1877.987954]  [<ffffffff81679698>] int3+0x28/0x40 
     129Jul 11 23:31:00 quantal-nested kernel: [ 1877.992037]  [<ffffffff81064071>] ? sys_getpid+0x1/0x30 
     130Jul 11 23:31:00 quantal-nested kernel: [ 1877.995934]  <<EOE>>  [<ffffffff816812e9>] ? system_call_fastpath+0x16/0x1b 
     131}}} 
     132  * gdb attach L1 => L2 
     133   * mitty@quantal-l1:~/works/linux-3.5.1$ gdb 
     134{{{ 
     135(gdb) file vmlinux 
     136Reading symbols from /home/mitty/works/linux-3.5.1/vmlinux...done. 
     137(gdb) b sys_getpid 
     138Breakpoint 1 at 0xffffffff81064070: file kernel/timer.c, line 1414. 
     139(gdb) target remote 127.0.0.1:1234 
     140Remote debugging using 127.0.0.1:1234 
     141native_safe_halt () 
     142    at /home/mitty/works/linux-3.5.1/arch/x86/include/asm/irqflags.h:50 
     14350      } 
     144(gdb) c 
     145Continuing. 
     146}}} 
     147   * kern.log 
     148{{{ 
     149Jul 11 23:32:34 quantal-nested kernel: [ 1971.193620] int3: 0000 [#2] SMP  
     150Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] CPU 0  
     151Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Modules linked in: kvm_intel kvm ppdev psmouse microcode parport_pc serio_raw i2c_piix4 mac_hid lp parport floppy 8139too 8139cp 
     152Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085]  
     153Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Pid: 970, comm: getpid Tainted: G      D W    3.5.1 #1 Bochs Bochs 
     154Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RIP: 0010:[<ffffffff81064071>]  [<ffffffff81064071>] sys_getpid+0x1/0x30 
     155Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RSP: 0018:ffff880018dfff80  EFLAGS: 00010293 
     156Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RAX: 0000000000000027 RBX: 0000000000000000 RCX: 00007fff6dc338f0 
     157Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RDX: 0000000000000000 RSI: 00007fff6dc33c48 RDI: 0000000000000001 
     158Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RBP: 00007fff6dc33b60 R08: 0000000000400610 R09: 00007fce0d61b750 
     159Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] R10: 00007fff6dc338f0 R11: 0000000000000246 R12: 0000000000400450 
     160Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] R13: 00007fff6dc33c40 R14: 0000000000000000 R15: 0000000000000000 
     161Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] FS:  00007fce0d824700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 
     162Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 
     163Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] CR2: 00007fce0d30d6d0 CR3: 0000000024c2f000 CR4: 00000000000006f0 
     164Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
     165Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 
     166Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Process getpid (pid: 970, threadinfo ffff880018dfe000, task ffff88003da44500) 
     167Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Stack: 
     168Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085]  ffffffff816812e9 0000000000000246 00007fff6dc338f0 00007fce0d61b750 
     169Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085]  0000000000400610 0000000000000027 0000000000400580 0000000000000000 
     170Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085]  00007fff6dc33c48 0000000000000001 0000000000000027 00007fce0d30d6f9 
     171Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Call Trace: 
     172Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085]  [<ffffffff816812e9>] ? system_call_fastpath+0x16/0x1b 
     173Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 66 66 66 66 90 e8 c2 4d ff ff 5d 89 c0 c3 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 cc <48> 89 e5 66 66 66 66 90 65 48 8b 04 25 00 c7 00 00 48 8b 80 f0  
     174Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RIP  [<ffffffff81064071>] sys_getpid+0x1/0x30 
     175Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085]  RSP <ffff880018dfff80> 
     176Jul 11 23:32:34 quantal-nested kernel: [ 1971.429516] ---[ end trace 626ed62bf5aa88ac ]--- 
     177Jul 11 23:32:34 quantal-nested kernel: [ 1971.433353] BUG: scheduling while atomic: getpid/970/0x10000001 
     178Jul 11 23:32:34 quantal-nested kernel: [ 1971.437605] Modules linked in: kvm_intel kvm ppdev psmouse microcode parport_pc serio_raw i2c_piix4 mac_hid lp parport floppy 8139too 8139cp 
     179Jul 11 23:32:34 quantal-nested kernel: [ 1971.454074] Pid: 970, comm: getpid Tainted: G      D W    3.5.1 #1 
     180Jul 11 23:32:34 quantal-nested kernel: [ 1971.459631] Call Trace: 
     181Jul 11 23:32:34 quantal-nested kernel: [ 1971.463006]  <#DB[1]>  [<ffffffff8166e564>] __schedule_bug+0x4d/0x59 
     182Jul 11 23:32:34 quantal-nested kernel: [ 1971.467796]  [<ffffffff81677d34>] __schedule+0x6e4/0x7c0 
     183Jul 11 23:32:34 quantal-nested kernel: [ 1971.472053]  [<ffffffff81084b4a>] __cond_resched+0x2a/0x40 
     184Jul 11 23:32:34 quantal-nested kernel: [ 1971.476354]  [<ffffffff81677e90>] _cond_resched+0x30/0x40 
     185Jul 11 23:32:34 quantal-nested kernel: [ 1971.480364]  [<ffffffff81677326>] down_read+0x16/0x2b 
     186Jul 11 23:32:34 quantal-nested kernel: [ 1971.484258]  [<ffffffff810681cb>] exit_signals+0x2b/0x130 
     187Jul 11 23:32:34 quantal-nested kernel: [ 1971.488224]  [<ffffffff8107c3e6>] ? blocking_notifier_call_chain+0x16/0x20 
     188Jul 11 23:32:34 quantal-nested kernel: [ 1971.492594]  [<ffffffff810577b4>] do_exit+0xb4/0x8e0 
     189Jul 11 23:32:34 quantal-nested kernel: [ 1971.496434]  [<ffffffff8166dfe0>] ? printk+0x61/0x63 
     190Jul 11 23:32:34 quantal-nested kernel: [ 1971.502565]  [<ffffffff8167a334>] oops_end+0xa4/0xf0 
     191Jul 11 23:32:34 quantal-nested kernel: [ 1971.506615]  [<ffffffff810166b8>] die+0x58/0x90 
     192Jul 11 23:32:34 quantal-nested kernel: [ 1971.510514]  [<ffffffff81679c40>] do_trap+0xc0/0x170 
     193Jul 11 23:32:34 quantal-nested kernel: [ 1971.514546]  [<ffffffff8167d062>] ? __atomic_notifier_call_chain+0x12/0x20 
     194Jul 11 23:32:34 quantal-nested kernel: [ 1971.519120]  [<ffffffff81679f39>] do_int3+0xd9/0x130 
     195Jul 11 23:32:34 quantal-nested kernel: [ 1971.523203]  [<ffffffff81679698>] int3+0x28/0x40 
     196Jul 11 23:32:34 quantal-nested kernel: [ 1971.527218]  [<ffffffff81064071>] ? sys_getpid+0x1/0x30 
     197Jul 11 23:32:34 quantal-nested kernel: [ 1971.531377]  <<EOE>>  [<ffffffff816812e9>] ? system_call_fastpath+0x16/0x1b 
     198Jul 11 23:32:34 quantal-nested kernel: [ 1971.536974] note: getpid[970] exited with preempt_count 1 
     199Jul 11 23:32:34 quantal-nested kernel: [ 1971.541020] BUG: scheduling while atomic: getpid/970/0x10000001 
     200Jul 11 23:32:34 quantal-nested kernel: [ 1971.545193] Modules linked in: kvm_intel kvm ppdev psmouse microcode parport_pc serio_raw i2c_piix4 mac_hid lp parport floppy 8139too 8139cp 
     201Jul 11 23:32:34 quantal-nested kernel: [ 1971.561926] Pid: 970, comm: getpid Tainted: G      D W    3.5.1 #1 
     202Jul 11 23:32:34 quantal-nested kernel: [ 1971.566331] Call Trace: 
     203Jul 11 23:32:34 quantal-nested kernel: [ 1971.569623]  <#DB[1]>  [<ffffffff8166e564>] __schedule_bug+0x4d/0x59 
     204Jul 11 23:32:34 quantal-nested kernel: [ 1971.574595]  [<ffffffff81677d34>] __schedule+0x6e4/0x7c0 
     205Jul 11 23:32:34 quantal-nested kernel: [ 1971.578747]  [<ffffffff81084b4a>] __cond_resched+0x2a/0x40 
     206Jul 11 23:32:34 quantal-nested kernel: [ 1971.583011]  [<ffffffff81677e90>] _cond_resched+0x30/0x40 
     207Jul 11 23:32:34 quantal-nested kernel: [ 1971.587401]  [<ffffffff81677326>] down_read+0x16/0x2b 
     208Jul 11 23:32:34 quantal-nested kernel: [ 1971.593630]  [<ffffffff810b7acb>] acct_collect+0x4b/0x1c0 
     209Jul 11 23:32:34 quantal-nested kernel: [ 1971.597808]  [<ffffffff81057d83>] do_exit+0x683/0x8e0 
     210Jul 11 23:32:34 quantal-nested kernel: [ 1971.601871]  [<ffffffff8167a334>] oops_end+0xa4/0xf0 
     211Jul 11 23:32:34 quantal-nested kernel: [ 1971.605873]  [<ffffffff810166b8>] die+0x58/0x90 
     212Jul 11 23:32:34 quantal-nested kernel: [ 1971.609722]  [<ffffffff81679c40>] do_trap+0xc0/0x170 
     213Jul 11 23:32:34 quantal-nested kernel: [ 1971.613718]  [<ffffffff8167d062>] ? __atomic_notifier_call_chain+0x12/0x20 
     214Jul 11 23:32:34 quantal-nested kernel: [ 1971.618365]  [<ffffffff81679f39>] do_int3+0xd9/0x130 
     215Jul 11 23:32:34 quantal-nested kernel: [ 1971.622438]  [<ffffffff81679698>] int3+0x28/0x40 
     216Jul 11 23:32:34 quantal-nested kernel: [ 1971.626413]  [<ffffffff81064071>] ? sys_getpid+0x1/0x30 
     217Jul 11 23:32:34 quantal-nested kernel: [ 1971.630548]  <<EOE>>  [<ffffffff816812e9>] ? system_call_fastpath+0x16/0x1b 
     218}}} 
     219 * case2 
     220  * gdb attach L1 => L2 
     221   * mitty@kvm-l1:~/works/linux-3.2.48$ gdb 
     222{{{ 
     223(gdb) file vmlinux 
     224Reading symbols from /home/mitty/works/linux-3.2.48/vmlinux...done. 
     225(gdb) b sys_getpid 
     226Breakpoint 1 at 0xc1068290: file kernel/timer.c, line 1358. 
     227(gdb) target remote 127.0.0.1:1234 
     228Remote debugging using 127.0.0.1:1234 
     229native_safe_halt () 
     230    at /home/mitty/works/linux-3.2.48/arch/x86/include/asm/irqflags.h:50 
     23150      } 
     232(gdb) c 
     233Continuing. 
     234}}} 
     235   * kern.log 
     236{{{ 
     237Jul 11 22:51:18 precise-l2 kernel: [  440.401637] int3: 0000 [#1] SMP  
     238Jul 11 22:51:18 precise-l2 kernel: [  440.404089] Modules linked in: ppdev psmouse parport_pc serio_raw mac_hid i2c_piix4 lp parport floppy 8139too 8139cp 
     239Jul 11 22:51:18 precise-l2 kernel: [  440.404089]  
     240Jul 11 22:51:18 precise-l2 kernel: [  440.404089] Pid: 994, comm: getpid Not tainted 3.2.48 #1 Bochs Bochs 
     241Jul 11 22:51:18 precise-l2 kernel: [  440.404089] EIP: 0060:[<c1068291>] EFLAGS: 00000297 CPU: 0 
     242Jul 11 22:51:18 precise-l2 kernel: [  440.404089] EIP is at sys_getpid+0x1/0x30 
     243Jul 11 22:51:18 precise-l2 kernel: [  440.404089] EAX: 00000014 EBX: b7747ff4 ECX: bfb4cfc4 EDX: 000000e0 
     244Jul 11 22:51:18 precise-l2 kernel: [  440.404089] ESI: 00000000 EDI: 00000000 EBP: e5702000 ESP: e5703fb0 
     245Jul 11 22:51:18 precise-l2 kernel: [  440.404089]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 
     246Jul 11 22:51:18 precise-l2 kernel: [  440.404089] Process getpid (pid: 994, ti=e5702000 task=e57ecbc0 task.ti=e5702000) 
     247Jul 11 22:51:18 precise-l2 kernel: [  440.404089] Stack: 
     248Jul 11 22:51:18 precise-l2 kernel: [  440.404089]  c158dd44 b7747ff4 bfb4cfc4 00000000 00000000 00000000 bfb4cf28 00000014 
     249Jul 11 22:51:18 precise-l2 kernel: [  440.404089]  0000007b 0000007b 00000000 00000033 00000014 b7753416 00000073 00000246 
     250Jul 11 22:51:18 precise-l2 kernel: [  440.404089]  bfb4cf08 0000007b 00000000 00000000 
     251Jul 11 22:51:18 precise-l2 kernel: [  440.404089] Call Trace: 
     252Jul 11 22:51:18 precise-l2 kernel: [  440.404089]  [<c158dd44>] ? syscall_call+0x7/0xb 
     253Jul 11 22:51:18 precise-l2 kernel: [  440.404089] Code: f8 8b 7d fc 89 ec 5d c3 66 90 55 89 e5 3e 8d 74 26 00 8b 45 08 e8 c0 55 ff ff 5d c3 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 cc <89> e5 3e 8d 74 26 00 64 a1 4c ae 8f c1 8b 80 2c 02 00 00 8b 80  
     254Jul 11 22:51:18 precise-l2 kernel: [  440.404089] EIP: [<c1068291>] sys_getpid+0x1/0x30 SS:ESP 0068:e5703fb0 
     255Jul 11 22:51:18 precise-l2 kernel: [  440.584643] ---[ end trace 13cb4567d2843904 ]--- 
     256Jul 11 22:51:18 precise-l2 kernel: [  440.589404] note: getpid[994] exited with preempt_count 1 
     257Jul 11 22:51:18 precise-l2 kernel: [  440.594107] BUG: scheduling while atomic: getpid/994/0x10000001 
     258Jul 11 22:51:18 precise-l2 kernel: [  440.599042] Modules linked in: ppdev psmouse parport_pc serio_raw mac_hid i2c_piix4 lp parport floppy 8139too 8139cp 
     259Jul 11 22:51:18 precise-l2 kernel: [  440.614812] Pid: 994, comm: getpid Tainted: G      D      3.2.48 #1 
     260Jul 11 22:51:18 precise-l2 kernel: [  440.620549] Call Trace: 
     261Jul 11 22:51:18 precise-l2 kernel: [  440.624267]  [<c1584497>] ? printk+0x2d/0x2f 
     262Jul 11 22:51:18 precise-l2 kernel: [  440.628617]  [<c1584242>] __schedule_bug+0x60/0x66 
     263Jul 11 22:51:18 precise-l2 kernel: [  440.633044]  [<c158baa7>] __schedule+0x757/0x8c0 
     264Jul 11 22:51:18 precise-l2 kernel: [  440.637723]  [<c10594c6>] ? vprintk+0x176/0x4a0 
     265Jul 11 22:51:18 precise-l2 kernel: [  440.642134]  [<c10353b8>] ? default_spin_lock_flags+0x8/0x10 
     266Jul 11 22:51:18 precise-l2 kernel: [  440.647215]  [<c158dc3d>] ? _raw_spin_lock_irqsave+0x2d/0x40 
     267Jul 11 22:51:18 precise-l2 kernel: [  440.652420]  [<c10512fb>] __cond_resched+0x1b/0x30 
     268Jul 11 22:51:18 precise-l2 kernel: [  440.656954]  [<c158bc86>] _cond_resched+0x26/0x30 
     269Jul 11 22:51:18 precise-l2 kernel: [  440.661390]  [<c158cf20>] down_read+0x10/0x1f 
     270Jul 11 22:51:18 precise-l2 kernel: [  440.666075]  [<c109d832>] acct_collect+0x42/0x170 
     271Jul 11 22:51:18 precise-l2 kernel: [  440.670738]  [<c105c9c7>] do_exit+0x567/0x6f0 
     272Jul 11 22:51:18 precise-l2 kernel: [  440.675455]  [<c158eb8e>] oops_end+0x8e/0xd0 
     273Jul 11 22:51:18 precise-l2 kernel: [  440.681704]  [<c1013984>] die+0x54/0x80 
     274Jul 11 22:51:18 precise-l2 kernel: [  440.686044]  [<c158e666>] do_trap+0x96/0xd0 
     275Jul 11 22:51:18 precise-l2 kernel: [  440.690568]  [<c158e8c1>] do_int3+0xa1/0xc0 
     276Jul 11 22:51:18 precise-l2 kernel: [  440.695007]  [<c158e5a4>] int3+0x30/0x38 
     277Jul 11 22:51:18 precise-l2 kernel: [  440.699589]  [<c15900d8>] ? trampoline_handler+0x158/0x190 
     278Jul 11 22:51:18 precise-l2 kernel: [  440.704554]  [<c1068291>] ? sys_getpid+0x1/0x30 
     279Jul 11 22:51:18 precise-l2 kernel: [  440.709022]  [<c158dd44>] ? syscall_call+0x7/0xb 
     280}}}