[[PageOutline]] * KVM on KVMで、内側のゲストカーネルをGDBでデバッグしようとすると予想しない挙動を示す * テストした環境 * case1 * L0 * Core i7 940 * Ubuntu 12.04 3.2.0-49-generic x86_64 * QEMU emulator version 1.0 (qemu-kvm-1.0) * L1 * Core 2 Duo T7700 * Ubuntu 12.10 3.5.0-36-generic i686 * QEMU emulator version 1.2.0 (qemu-kvm-1.2.0+noroms-0ubuntu2.12.10.4, Debian) * L2 * QEMU Virtual CPU version 1.2.0 * Ubuntu 12.04 3.2.48 i686 * linux-3.2.48.tar.xz with /boot/config-3.2.0-49-generic * case2 * L0 * Core i5 750 * Ubuntu 12.10 3.5.1 x86_64 * linux-3.5.1.tar.xz with /boot/config-3.5.0-36-generic * QEMU emulator version 1.2.0 (qemu-kvm-1.2.0+noroms-0ubuntu2.12.10.4, Debian) * L1 * Core i7 9xx (Nehalem Class Core i7) * Ubuntu 12.10 3.5.1 x86_64 * QEMU emulator version 1.2.0 (qemu-kvm-1.2.0+noroms-0ubuntu2.12.10.4, Debian) * L2 * QEMU Virtual CPU version 1.2.0 * Ubuntu 12.10 3.5.1 x86_64 * getpid.c {{{#!cc #include #include #include int main() { printf ("%d\n", getpid()); return 0; } }}} * case1 * gdb attach L0 => L2 * mitty@quantal-l0:~/works/linux-3.5.1$ gdb {{{ (gdb) file vmlinux Reading symbols from /home/mitty/works/linux-3.5.1/vmlinux...done. (gdb) b sys_getpid Breakpoint 1 at 0xffffffff81064070: file kernel/timer.c, line 1414. (gdb) target remote 192.168.XX.223:1234 Remote debugging using 192.168.XX.223:1234 native_safe_halt () at /home/mitty/works/linux-3.5.1/arch/x86/include/asm/irqflags.h:50 50 } (gdb) c Continuing. }}} * kern.log {{{ Jul 11 23:31:00 quantal-nested kernel: [ 1877.578453] int3: 0000 [#1] SMP Jul 11 23:31:00 quantal-nested kernel: [ 1877.591921] CPU 0 Jul 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 Jul 11 23:31:00 quantal-nested kernel: [ 1877.614280] Jul 11 23:31:00 quantal-nested kernel: [ 1877.616880] Pid: 946, comm: getpid Not tainted 3.5.1 #1 Bochs Bochs Jul 11 23:31:00 quantal-nested kernel: [ 1877.622425] RIP: 0010:[] [] sys_getpid+0x1/0x30 Jul 11 23:31:00 quantal-nested kernel: [ 1877.629986] RSP: 0018:ffff88003cfa5f80 EFLAGS: 00010293 Jul 11 23:31:00 quantal-nested kernel: [ 1877.634137] RAX: 0000000000000027 RBX: 0000000000000000 RCX: 00007fffb9729930 Jul 11 23:31:00 quantal-nested kernel: [ 1877.638935] RDX: 0000000000000000 RSI: 00007fffb9729c88 RDI: 0000000000000001 Jul 11 23:31:00 quantal-nested kernel: [ 1877.643660] RBP: 00007fffb9729ba0 R08: 0000000000400610 R09: 00007f664da39750 Jul 11 23:31:00 quantal-nested kernel: [ 1877.648427] R10: 00007fffb9729930 R11: 0000000000000246 R12: 0000000000400450 Jul 11 23:31:00 quantal-nested kernel: [ 1877.652946] R13: 00007fffb9729c80 R14: 0000000000000000 R15: 0000000000000000 Jul 11 23:31:00 quantal-nested kernel: [ 1877.657537] FS: 00007f664dc42700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 Jul 11 23:31:00 quantal-nested kernel: [ 1877.664543] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 11 23:31:00 quantal-nested kernel: [ 1877.668770] CR2: 00007f664d72b6d0 CR3: 000000001921f000 CR4: 00000000000006f0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.673353] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jul 11 23:31:00 quantal-nested kernel: [ 1877.678072] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jul 11 23:31:00 quantal-nested kernel: [ 1877.682699] Process getpid (pid: 946, threadinfo ffff88003cfa4000, task ffff88003da44500) Jul 11 23:31:00 quantal-nested kernel: [ 1877.693357] Stack: Jul 11 23:31:00 quantal-nested kernel: [ 1877.696519] ffffffff816812e9 0000000000000246 00007fffb9729930 00007f664da39750 Jul 11 23:31:00 quantal-nested kernel: [ 1877.705634] 0000000000400610 0000000000000027 0000000000400580 0000000000000000 Jul 11 23:31:00 quantal-nested kernel: [ 1877.714651] 00007fffb9729c88 0000000000000001 0000000000000027 00007f664d72b6f9 Jul 11 23:31:00 quantal-nested kernel: [ 1877.724455] Call Trace: Jul 11 23:31:00 quantal-nested kernel: [ 1877.727731] [] ? system_call_fastpath+0x16/0x1b Jul 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 Jul 11 23:31:00 quantal-nested kernel: [ 1877.792020] RIP [] sys_getpid+0x1/0x30 Jul 11 23:31:00 quantal-nested kernel: [ 1877.797667] RSP Jul 11 23:31:00 quantal-nested kernel: [ 1877.801729] ---[ end trace 626ed62bf5aa88ab ]--- Jul 11 23:31:00 quantal-nested kernel: [ 1877.806097] BUG: scheduling while atomic: getpid/946/0x10000001 Jul 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 Jul 11 23:31:00 quantal-nested kernel: [ 1877.827458] Pid: 946, comm: getpid Tainted: G D 3.5.1 #1 Jul 11 23:31:00 quantal-nested kernel: [ 1877.832034] Call Trace: Jul 11 23:31:00 quantal-nested kernel: [ 1877.835138] <#DB> [] __schedule_bug+0x4d/0x59 Jul 11 23:31:00 quantal-nested kernel: [ 1877.839978] [] __schedule+0x6e4/0x7c0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.844322] [] __cond_resched+0x2a/0x40 Jul 11 23:31:00 quantal-nested kernel: [ 1877.848360] [] _cond_resched+0x30/0x40 Jul 11 23:31:00 quantal-nested kernel: [ 1877.852387] [] down_read+0x16/0x2b Jul 11 23:31:00 quantal-nested kernel: [ 1877.856313] [] exit_signals+0x2b/0x130 Jul 11 23:31:00 quantal-nested kernel: [ 1877.860322] [] ? blocking_notifier_call_chain+0x16/0x20 Jul 11 23:31:00 quantal-nested kernel: [ 1877.864782] [] do_exit+0xb4/0x8e0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.868730] [] ? printk+0x61/0x63 Jul 11 23:31:00 quantal-nested kernel: [ 1877.873228] [] oops_end+0xa4/0xf0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.877232] [] die+0x58/0x90 Jul 11 23:31:00 quantal-nested kernel: [ 1877.881063] [] do_trap+0xc0/0x170 Jul 11 23:31:00 quantal-nested kernel: [ 1877.885899] [] do_int3+0xd9/0x130 Jul 11 23:31:00 quantal-nested kernel: [ 1877.889902] [] int3+0x28/0x40 Jul 11 23:31:00 quantal-nested kernel: [ 1877.893805] [] ? sys_getpid+0x1/0x30 Jul 11 23:31:00 quantal-nested kernel: [ 1877.897890] <> [] ? system_call_fastpath+0x16/0x1b Jul 11 23:31:00 quantal-nested kernel: [ 1877.903220] note: getpid[946] exited with preempt_count 1 Jul 11 23:31:00 quantal-nested kernel: [ 1877.907471] BUG: scheduling while atomic: getpid/946/0x10000001 Jul 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 Jul 11 23:31:00 quantal-nested kernel: [ 1877.933729] Pid: 946, comm: getpid Tainted: G D W 3.5.1 #1 Jul 11 23:31:00 quantal-nested kernel: [ 1877.938159] Call Trace: Jul 11 23:31:00 quantal-nested kernel: [ 1877.941419] <#DB> [] __schedule_bug+0x4d/0x59 Jul 11 23:31:00 quantal-nested kernel: [ 1877.946391] [] __schedule+0x6e4/0x7c0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.950571] [] __cond_resched+0x2a/0x40 Jul 11 23:31:00 quantal-nested kernel: [ 1877.954840] [] _cond_resched+0x30/0x40 Jul 11 23:31:00 quantal-nested kernel: [ 1877.959065] [] down_read+0x16/0x2b Jul 11 23:31:00 quantal-nested kernel: [ 1877.963238] [] acct_collect+0x4b/0x1c0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.967488] [] do_exit+0x683/0x8e0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.971680] [] oops_end+0xa4/0xf0 Jul 11 23:31:00 quantal-nested kernel: [ 1877.975844] [] die+0x58/0x90 Jul 11 23:31:00 quantal-nested kernel: [ 1877.979899] [] do_trap+0xc0/0x170 Jul 11 23:31:00 quantal-nested kernel: [ 1877.984131] [] do_int3+0xd9/0x130 Jul 11 23:31:00 quantal-nested kernel: [ 1877.987954] [] int3+0x28/0x40 Jul 11 23:31:00 quantal-nested kernel: [ 1877.992037] [] ? sys_getpid+0x1/0x30 Jul 11 23:31:00 quantal-nested kernel: [ 1877.995934] <> [] ? system_call_fastpath+0x16/0x1b }}} * gdb attach L1 => L2 * mitty@quantal-l1:~/works/linux-3.5.1$ gdb {{{ (gdb) file vmlinux Reading symbols from /home/mitty/works/linux-3.5.1/vmlinux...done. (gdb) b sys_getpid Breakpoint 1 at 0xffffffff81064070: file kernel/timer.c, line 1414. (gdb) target remote 127.0.0.1:1234 Remote debugging using 127.0.0.1:1234 native_safe_halt () at /home/mitty/works/linux-3.5.1/arch/x86/include/asm/irqflags.h:50 50 } (gdb) c Continuing. }}} * kern.log {{{ Jul 11 23:32:34 quantal-nested kernel: [ 1971.193620] int3: 0000 [#2] SMP Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] CPU 0 Jul 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 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Pid: 970, comm: getpid Tainted: G D W 3.5.1 #1 Bochs Bochs Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RIP: 0010:[] [] sys_getpid+0x1/0x30 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RSP: 0018:ffff880018dfff80 EFLAGS: 00010293 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RAX: 0000000000000027 RBX: 0000000000000000 RCX: 00007fff6dc338f0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RDX: 0000000000000000 RSI: 00007fff6dc33c48 RDI: 0000000000000001 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RBP: 00007fff6dc33b60 R08: 0000000000400610 R09: 00007fce0d61b750 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] R10: 00007fff6dc338f0 R11: 0000000000000246 R12: 0000000000400450 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] R13: 00007fff6dc33c40 R14: 0000000000000000 R15: 0000000000000000 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] FS: 00007fce0d824700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] CR2: 00007fce0d30d6d0 CR3: 0000000024c2f000 CR4: 00000000000006f0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Process getpid (pid: 970, threadinfo ffff880018dfe000, task ffff88003da44500) Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Stack: Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] ffffffff816812e9 0000000000000246 00007fff6dc338f0 00007fce0d61b750 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] 0000000000400610 0000000000000027 0000000000400580 0000000000000000 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] 00007fff6dc33c48 0000000000000001 0000000000000027 00007fce0d30d6f9 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] Call Trace: Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] [] ? system_call_fastpath+0x16/0x1b Jul 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 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RIP [] sys_getpid+0x1/0x30 Jul 11 23:32:34 quantal-nested kernel: [ 1971.196085] RSP Jul 11 23:32:34 quantal-nested kernel: [ 1971.429516] ---[ end trace 626ed62bf5aa88ac ]--- Jul 11 23:32:34 quantal-nested kernel: [ 1971.433353] BUG: scheduling while atomic: getpid/970/0x10000001 Jul 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 Jul 11 23:32:34 quantal-nested kernel: [ 1971.454074] Pid: 970, comm: getpid Tainted: G D W 3.5.1 #1 Jul 11 23:32:34 quantal-nested kernel: [ 1971.459631] Call Trace: Jul 11 23:32:34 quantal-nested kernel: [ 1971.463006] <#DB[1]> [] __schedule_bug+0x4d/0x59 Jul 11 23:32:34 quantal-nested kernel: [ 1971.467796] [] __schedule+0x6e4/0x7c0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.472053] [] __cond_resched+0x2a/0x40 Jul 11 23:32:34 quantal-nested kernel: [ 1971.476354] [] _cond_resched+0x30/0x40 Jul 11 23:32:34 quantal-nested kernel: [ 1971.480364] [] down_read+0x16/0x2b Jul 11 23:32:34 quantal-nested kernel: [ 1971.484258] [] exit_signals+0x2b/0x130 Jul 11 23:32:34 quantal-nested kernel: [ 1971.488224] [] ? blocking_notifier_call_chain+0x16/0x20 Jul 11 23:32:34 quantal-nested kernel: [ 1971.492594] [] do_exit+0xb4/0x8e0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.496434] [] ? printk+0x61/0x63 Jul 11 23:32:34 quantal-nested kernel: [ 1971.502565] [] oops_end+0xa4/0xf0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.506615] [] die+0x58/0x90 Jul 11 23:32:34 quantal-nested kernel: [ 1971.510514] [] do_trap+0xc0/0x170 Jul 11 23:32:34 quantal-nested kernel: [ 1971.514546] [] ? __atomic_notifier_call_chain+0x12/0x20 Jul 11 23:32:34 quantal-nested kernel: [ 1971.519120] [] do_int3+0xd9/0x130 Jul 11 23:32:34 quantal-nested kernel: [ 1971.523203] [] int3+0x28/0x40 Jul 11 23:32:34 quantal-nested kernel: [ 1971.527218] [] ? sys_getpid+0x1/0x30 Jul 11 23:32:34 quantal-nested kernel: [ 1971.531377] <> [] ? system_call_fastpath+0x16/0x1b Jul 11 23:32:34 quantal-nested kernel: [ 1971.536974] note: getpid[970] exited with preempt_count 1 Jul 11 23:32:34 quantal-nested kernel: [ 1971.541020] BUG: scheduling while atomic: getpid/970/0x10000001 Jul 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 Jul 11 23:32:34 quantal-nested kernel: [ 1971.561926] Pid: 970, comm: getpid Tainted: G D W 3.5.1 #1 Jul 11 23:32:34 quantal-nested kernel: [ 1971.566331] Call Trace: Jul 11 23:32:34 quantal-nested kernel: [ 1971.569623] <#DB[1]> [] __schedule_bug+0x4d/0x59 Jul 11 23:32:34 quantal-nested kernel: [ 1971.574595] [] __schedule+0x6e4/0x7c0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.578747] [] __cond_resched+0x2a/0x40 Jul 11 23:32:34 quantal-nested kernel: [ 1971.583011] [] _cond_resched+0x30/0x40 Jul 11 23:32:34 quantal-nested kernel: [ 1971.587401] [] down_read+0x16/0x2b Jul 11 23:32:34 quantal-nested kernel: [ 1971.593630] [] acct_collect+0x4b/0x1c0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.597808] [] do_exit+0x683/0x8e0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.601871] [] oops_end+0xa4/0xf0 Jul 11 23:32:34 quantal-nested kernel: [ 1971.605873] [] die+0x58/0x90 Jul 11 23:32:34 quantal-nested kernel: [ 1971.609722] [] do_trap+0xc0/0x170 Jul 11 23:32:34 quantal-nested kernel: [ 1971.613718] [] ? __atomic_notifier_call_chain+0x12/0x20 Jul 11 23:32:34 quantal-nested kernel: [ 1971.618365] [] do_int3+0xd9/0x130 Jul 11 23:32:34 quantal-nested kernel: [ 1971.622438] [] int3+0x28/0x40 Jul 11 23:32:34 quantal-nested kernel: [ 1971.626413] [] ? sys_getpid+0x1/0x30 Jul 11 23:32:34 quantal-nested kernel: [ 1971.630548] <> [] ? system_call_fastpath+0x16/0x1b }}} * case2 * gdb attach L1 => L2 * mitty@kvm-l1:~/works/linux-3.2.48$ gdb {{{ (gdb) file vmlinux Reading symbols from /home/mitty/works/linux-3.2.48/vmlinux...done. (gdb) b sys_getpid Breakpoint 1 at 0xc1068290: file kernel/timer.c, line 1358. (gdb) target remote 127.0.0.1:1234 Remote debugging using 127.0.0.1:1234 native_safe_halt () at /home/mitty/works/linux-3.2.48/arch/x86/include/asm/irqflags.h:50 50 } (gdb) c Continuing. }}} * kern.log {{{ Jul 11 22:51:18 precise-l2 kernel: [ 440.401637] int3: 0000 [#1] SMP Jul 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 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] Pid: 994, comm: getpid Not tainted 3.2.48 #1 Bochs Bochs Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] EIP: 0060:[] EFLAGS: 00000297 CPU: 0 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] EIP is at sys_getpid+0x1/0x30 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] EAX: 00000014 EBX: b7747ff4 ECX: bfb4cfc4 EDX: 000000e0 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] ESI: 00000000 EDI: 00000000 EBP: e5702000 ESP: e5703fb0 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] Process getpid (pid: 994, ti=e5702000 task=e57ecbc0 task.ti=e5702000) Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] Stack: Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] c158dd44 b7747ff4 bfb4cfc4 00000000 00000000 00000000 bfb4cf28 00000014 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] 0000007b 0000007b 00000000 00000033 00000014 b7753416 00000073 00000246 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] bfb4cf08 0000007b 00000000 00000000 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] Call Trace: Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] [] ? syscall_call+0x7/0xb Jul 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 Jul 11 22:51:18 precise-l2 kernel: [ 440.404089] EIP: [] sys_getpid+0x1/0x30 SS:ESP 0068:e5703fb0 Jul 11 22:51:18 precise-l2 kernel: [ 440.584643] ---[ end trace 13cb4567d2843904 ]--- Jul 11 22:51:18 precise-l2 kernel: [ 440.589404] note: getpid[994] exited with preempt_count 1 Jul 11 22:51:18 precise-l2 kernel: [ 440.594107] BUG: scheduling while atomic: getpid/994/0x10000001 Jul 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 Jul 11 22:51:18 precise-l2 kernel: [ 440.614812] Pid: 994, comm: getpid Tainted: G D 3.2.48 #1 Jul 11 22:51:18 precise-l2 kernel: [ 440.620549] Call Trace: Jul 11 22:51:18 precise-l2 kernel: [ 440.624267] [] ? printk+0x2d/0x2f Jul 11 22:51:18 precise-l2 kernel: [ 440.628617] [] __schedule_bug+0x60/0x66 Jul 11 22:51:18 precise-l2 kernel: [ 440.633044] [] __schedule+0x757/0x8c0 Jul 11 22:51:18 precise-l2 kernel: [ 440.637723] [] ? vprintk+0x176/0x4a0 Jul 11 22:51:18 precise-l2 kernel: [ 440.642134] [] ? default_spin_lock_flags+0x8/0x10 Jul 11 22:51:18 precise-l2 kernel: [ 440.647215] [] ? _raw_spin_lock_irqsave+0x2d/0x40 Jul 11 22:51:18 precise-l2 kernel: [ 440.652420] [] __cond_resched+0x1b/0x30 Jul 11 22:51:18 precise-l2 kernel: [ 440.656954] [] _cond_resched+0x26/0x30 Jul 11 22:51:18 precise-l2 kernel: [ 440.661390] [] down_read+0x10/0x1f Jul 11 22:51:18 precise-l2 kernel: [ 440.666075] [] acct_collect+0x42/0x170 Jul 11 22:51:18 precise-l2 kernel: [ 440.670738] [] do_exit+0x567/0x6f0 Jul 11 22:51:18 precise-l2 kernel: [ 440.675455] [] oops_end+0x8e/0xd0 Jul 11 22:51:18 precise-l2 kernel: [ 440.681704] [] die+0x54/0x80 Jul 11 22:51:18 precise-l2 kernel: [ 440.686044] [] do_trap+0x96/0xd0 Jul 11 22:51:18 precise-l2 kernel: [ 440.690568] [] do_int3+0xa1/0xc0 Jul 11 22:51:18 precise-l2 kernel: [ 440.695007] [] int3+0x30/0x38 Jul 11 22:51:18 precise-l2 kernel: [ 440.699589] [] ? trampoline_handler+0x158/0x190 Jul 11 22:51:18 precise-l2 kernel: [ 440.704554] [] ? sys_getpid+0x1/0x30 Jul 11 22:51:18 precise-l2 kernel: [ 440.709022] [] ? syscall_call+0x7/0xb }}}