Opened 16 years ago
Closed 16 years ago
#1875 closed defect (fixed)
Linux 2.6.26.* crashes at boot (kernel panic) -> fixed in 2.0.2
| Reported by: | Oxmosys | Owned by: | |
|---|---|---|---|
| Component: | other | Version: | VirtualBox 1.6.2 |
| Keywords: | Cc: | ||
| Guest type: | other | Host type: | other |
Description
Current ubuntu intrepid alpha 3 release crashes at start with a kernel panic under VBox 1.6.2 when VT-x is not enabled.
http://cdimage.ubuntu.com/releases/intrepid/alpha-3/ https://bugs.launchpad.net/ubuntu/intrepid/+source/linux/+bug/246067
Change History (8)
comment:1 by , 16 years ago
comment:2 by , 16 years ago
Ubuntu 2.6.26: Adding printk debug to text_poke_early on a non-SMP virtualised machine stops the bug happening. Any indication this bug could be a VirtualBox problem when modifying executable code?
void *text_poke_early(void *addr, const void *opcode, size_t len) {
unsigned long flags;
printk("text_poke_early: %p..%p\n",addr,addr+len);
local_irq_save(flags);
....
Colin King.
comment:3 by , 16 years ago
No, this sounds like a Linux bug, see my previous comment. Adding the instruction printk you change the timing.
comment:5 by , 16 years ago
This issue has been discussed by Linux kernel people in the following thread:
http://lkml.org/lkml/2008/8/20/359
They think that this is a virtualbox bug...
Frank, are you a virtualbox developer? Isn't this easier to debug on the virtualbox side? What can I do to help you debbug this?
comment:6 by , 16 years ago
I've dug a bit deeper, and I have some more information to add to this bug report.
By adding control code to apply_paravirt() in arch/x86/kernel/alternative.c I've been able to selectively turn on and off the code that patches parts of the kernel. The bug occurs when vprintk is patched. This is repeatable at the same region of patched code.
Below is a disassembly of vprintk, look for the " patching occurs after here" annotation to show roughly where the patched code is applied.
Not sure if that helps.
Colin
00000850 <vprintk>:
850: 55 push %ebp
851: 89 e5 mov %esp,%ebp
853: 57 push %edi
854: 56 push %esi
855: 53 push %ebx
856: 83 ec 60 sub $0x60,%esp
859: e8 fc ff ff ff call 85a <vprintk+0xa>
85e: a1 04 00 00 00 mov 0x4,%eax
863: 89 45 ac mov %eax,-0x54(%ebp)
866: 51 push %ecx
867: 52 push %edx
868: ff 15 04 00 00 00 call *0x4
86e: 5a pop %edx
86f: 59 pop %ecx
870: 89 45 b0 mov %eax,-0x50(%ebp)
873: 51 push %ecx
874: 52 push %edx
875: ff 15 0c 00 00 00 call *0xc
87b: 5a pop %edx
87c: 59 pop %ecx
87d: a1 70 00 00 00 mov 0x70,%eax
882: 64 8b 15 00 00 00 00 mov %fs:0x0,%edx
889: 89 55 b4 mov %edx,-0x4c(%ebp)
88c: 39 c2 cmp %eax,%edx
88e: 0f 84 9c 02 00 00 je b30 <vprintk+0x2e0>
894: b8 0c 00 00 00 mov $0xc,%eax
899: e8 fc ff ff ff call 89a <vprintk+0x4a>
89e: 8b 4d b4 mov -0x4c(%ebp),%ecx
8a1: 89 0d 70 00 00 00 mov %ecx,0x70
8a7: 8b 0d e4 00 02 00 mov 0x200e4,%ecx
8ad: 85 c9 test %ecx,%ecx
8af: 0f 85 33 02 00 00 jne ae8 <vprintk+0x298>
8b5: 31 db xor %ebx,%ebx
8b7: ba 00 04 00 00 mov $0x400,%edx
8bc: b8 00 01 02 00 mov $0x20100,%eax
8c1: 8b 4d 0c mov 0xc(%ebp),%ecx
8c4: 89 0c 24 mov %ecx,(%esp)
8c7: 8b 4d 08 mov 0x8(%ebp),%ecx
8ca: e8 fc ff ff ff call 8cb <vprintk+0x7b>
8cf: 01 d8 add %ebx,%eax
8d1: 89 45 bc mov %eax,-0x44(%ebp)
8d4: 0f b6 05 00 01 02 00 movzbl 0x20100,%eax
8db: 84 c0 test %al,%al
8dd: 0f 84 a5 00 00 00 je 988 <vprintk+0x138>
8e3: 8d 5d c2 lea -0x3e(%ebp),%ebx
8e6: bf 00 01 02 00 mov $0x20100,%edi
8eb: 89 5d a8 mov %ebx,-0x58(%ebp)
8ee: eb 65 jmp 955 <vprintk+0x105>
8f0: 3c 3c cmp $0x3c,%al
8f2: 0f 84 78 01 00 00 je a70 <vprintk+0x220>
8f8: b8 3c 00 00 00 mov $0x3c,%eax
8fd: e8 0e f8 ff ff call 110 <emit_log_char>
902: 0f b6 45 ac movzbl -0x54(%ebp),%eax
906: 83 c0 30 add $0x30,%eax
909: 0f be c0 movsbl %al,%eax
90c: e8 ff f7 ff ff call 110 <emit_log_char>
911: b8 3e 00 00 00 mov $0x3e,%eax
916: e8 f5 f7 ff ff call 110 <emit_log_char>
91b: 8b 35 38 00 00 00 mov 0x38,%esi
921: 83 45 bc 03 addl $0x3,-0x44(%ebp)
925: c7 05 74 00 00 00 00 movl $0x0,0x74
92c: 00 00 00
92f: 85 f6 test %esi,%esi
931: 0f 85 99 00 00 00 jne 9d0 <vprintk+0x180>
937: 0f b6 07 movzbl (%edi),%eax
93a: 84 c0 test %al,%al
93c: 74 4a je 988 <vprintk+0x138>
93e: 0f be c0 movsbl %al,%eax
941: e8 ca f7 ff ff call 110 <emit_log_char>
946: 80 3f 0a cmpb $0xa,(%edi)
949: 74 24 je 96f <vprintk+0x11f>
94b: 83 c7 01 add $0x1,%edi
94e: 0f b6 07 movzbl (%edi),%eax
951: 84 c0 test %al,%al
953: 74 33 je 988 <vprintk+0x138>
955: 8b 15 74 00 00 00 mov 0x74,%edx
95b: 85 d2 test %edx,%edx
95d: 75 91 jne 8f0 <vprintk+0xa0>
95f: 0f b6 07 movzbl (%edi),%eax
962: 0f be c0 movsbl %al,%eax
965: e8 a6 f7 ff ff call 110 <emit_log_char>
96a: 80 3f 0a cmpb $0xa,(%edi)
96d: 75 dc jne 94b <vprintk+0xfb>
96f: 83 c7 01 add $0x1,%edi
972: 0f b6 07 movzbl (%edi),%eax
975: c7 05 74 00 00 00 01 movl $0x1,0x74
97c: 00 00 00
97f: 84 c0 test %al,%al
981: 75 d2 jne 955 <vprintk+0x105>
983: 90 nop
984: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
988: e8 fc ff ff ff call 989 <vprintk+0x139>
98d: 31 f6 xor %esi,%esi
98f: 85 c0 test %eax,%eax
991: 0f 84 11 01 00 00 je aa8 <vprintk+0x258>
997: c7 05 70 00 00 00 ff movl $0xffffffff,0x70
99e: ff ff ff
9a1: b8 0c 00 00 00 mov $0xc,%eax
9a6: ff 15 10 00 00 00 call *0x10
9ac: 85 f6 test %esi,%esi
9ae: 74 05 je 9b5 <vprintk+0x165>
9b0: e8 fc ff ff ff call 9b1 <vprintk+0x161>
**** patching occurs after here
9b5: 8b 45 b0 mov -0x50(%ebp),%eax
9b8: 51 push %ecx
9b9: 52 push %edx
9ba: ff 15 08 00 00 00 call *0x8
9c0: 5a pop %edx
9c1: 59 pop %ecx
9c2: 8b 45 bc mov -0x44(%ebp),%eax
9c5: 83 c4 60 add $0x60,%esp
9c8: 5b pop %ebx
9c9: 5e pop %esi
9ca: 5f pop %edi
9cb: 5d pop %ebp
9cc: c3 ret
9cd: 8d 76 00 lea 0x0(%esi),%esi
9d0: a1 70 00 00 00 mov 0x70,%eax
9d5: e8 fc ff ff ff call 9d6 <vprintk+0x186>
9da: 89 45 a4 mov %eax,-0x5c(%ebp)
9dd: 31 c0 xor %eax,%eax
9df: 85 d2 test %edx,%edx
9e1: 89 d1 mov %edx,%ecx
9e3: 74 1c je a01 <vprintk+0x1b1>
9e5: b8 83 4b 04 00 mov $0x44b83,%eax
9ea: c1 ea 09 shr $0x9,%edx
9ed: f7 e2 mul %edx
9ef: c1 ea 07 shr $0x7,%edx
9f2: 69 c2 00 ca 9a 3b imul $0x3b9aca00,%edx,%eax
9f8: 29 c1 sub %eax,%ecx
9fa: 89 c8 mov %ecx,%eax
9fc: 89 d1 mov %edx,%ecx
9fe: c1 e9 00 shr $0x0,%ecx
a01: 89 c6 mov %eax,%esi
a03: bb 00 ca 9a 3b mov $0x3b9aca00,%ebx
a08: 8b 45 a4 mov -0x5c(%ebp),%eax
a0b: 89 f2 mov %esi,%edx
a0d: f7 f3 div %ebx
a0f: 89 d6 mov %edx,%esi
a11: 89 ca mov %ecx,%edx
a13: 89 c1 mov %eax,%ecx
a15: b8 d3 4d 62 10 mov $0x10624dd3,%eax
a1a: f7 e6 mul %esi
a1c: 89 4c 24 08 mov %ecx,0x8(%esp)
a20: 8d 75 c2 lea -0x3e(%ebp),%esi
a23: c7 44 24 04 05 00 00 movl $0x5,0x4(%esp)
a2a: 00
a2b: c1 ea 06 shr $0x6,%edx
a2e: 89 54 24 0c mov %edx,0xc(%esp)
a32: 8d 55 c2 lea -0x3e(%ebp),%edx
a35: 89 14 24 mov %edx,(%esp)
a38: e8 fc ff ff ff call a39 <vprintk+0x1e9>
a3d: 01 c6 add %eax,%esi
a3f: 3b 75 a8 cmp -0x58(%ebp),%esi
a42: 89 45 b8 mov %eax,-0x48(%ebp)
a45: 76 18 jbe a5f <vprintk+0x20f>
a47: 8d 5d c2 lea -0x3e(%ebp),%ebx
a4a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
a50: 0f be 03 movsbl (%ebx),%eax
a53: 83 c3 01 add $0x1,%ebx
a56: e8 b5 f6 ff ff call 110 <emit_log_char>
a5b: 39 f3 cmp %esi,%ebx
a5d: 72 f1 jb a50 <vprintk+0x200>
a5f: 8b 4d b8 mov -0x48(%ebp),%ecx
a62: 01 4d bc add %ecx,-0x44(%ebp)
a65: e9 cd fe ff ff jmp 937 <vprintk+0xe7>
a6a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
a70: 0f b6 47 01 movzbl 0x1(%edi),%eax
a74: 3c 2f cmp $0x2f,%al
a76: 0f 8e 7c fe ff ff jle 8f8 <vprintk+0xa8>
a7c: 3c 37 cmp $0x37,%al
a7e: 0f 8f 74 fe ff ff jg 8f8 <vprintk+0xa8>
a84: 80 7f 02 3e cmpb $0x3e,0x2(%edi)
a88: 0f 85 6a fe ff ff jne 8f8 <vprintk+0xa8>
a8e: 0f be c0 movsbl %al,%eax
a91: 83 c7 03 add $0x3,%edi
a94: 83 e8 30 sub $0x30,%eax
a97: 89 45 ac mov %eax,-0x54(%ebp)
a9a: 83 6d bc 03 subl $0x3,-0x44(%ebp)
a9e: e9 55 fe ff ff jmp 8f8 <vprintk+0xa8>
aa3: 90 nop
aa4: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
aa8: 8b 5d b4 mov -0x4c(%ebp),%ebx
aab: 0f a3 1d 00 00 00 00 bt %ebx,0x0
ab2: 19 c0 sbb %eax,%eax
ab4: 85 c0 test %eax,%eax
ab6: 75 22 jne ada <vprintk+0x28a>
ab8: a1 00 00 00 00 mov 0x0,%eax
abd: 85 c0 test %eax,%eax
abf: 75 0e jne acf <vprintk+0x27f>
ac1: eb 52 jmp b15 <vprintk+0x2c5>
ac3: 90 nop
ac4: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
ac8: 8b 40 34 mov 0x34(%eax),%eax
acb: 85 c0 test %eax,%eax
acd: 74 46 je b15 <vprintk+0x2c5>
acf: f6 40 28 10 testb $0x10,0x28(%eax)
ad3: 90 nop
ad4: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
ad8: 74 ee je ac8 <vprintk+0x278>
ada: be 01 00 00 00 mov $0x1,%esi
adf: 90 nop
ae0: e9 b2 fe ff ff jmp 997 <vprintk+0x147>
ae5: 8d 76 00 lea 0x0(%esi),%esi
ae8: ba 40 00 00 00 mov $0x40,%edx
aed: b8 00 01 02 00 mov $0x20100,%eax
af2: c7 05 e4 00 02 00 00 movl $0x0,0x200e4
af9: 00 00 00
afc: bb 22 00 00 00 mov $0x22,%ebx
b01: e8 fc ff ff ff call b02 <vprintk+0x2b2>
b06: ba de 03 00 00 mov $0x3de,%edx
b0b: b8 22 01 02 00 mov $0x20122,%eax
b10: e9 ac fd ff ff jmp 8c1 <vprintk+0x71>
b15: b8 4c 00 00 00 mov $0x4c,%eax
b1a: 31 f6 xor %esi,%esi
b1c: c7 05 14 00 00 00 00 movl $0x0,0x14
b23: 00 00 00
b26: e8 fc ff ff ff call b27 <vprintk+0x2d7>
b2b: e9 67 fe ff ff jmp 997 <vprintk+0x147>
b30: 8b 1d 00 00 00 00 mov 0x0,%ebx
b36: 85 db test %ebx,%ebx
b38: 74 64 je b9e <vprintk+0x34e>
b3a: a1 00 00 00 00 mov 0x0,%eax
b3f: 8b 0d 10 00 00 00 mov 0x10,%ecx
b45: 39 c8 cmp %ecx,%eax
b47: 78 14 js b5d <vprintk+0x30d>
b49: 8b 15 00 00 00 00 mov 0x0,%edx
b4f: 8d 81 b8 0b 00 00 lea 0xbb8(%ecx),%eax
b55: 39 d0 cmp %edx,%eax
b57: 0f 89 37 fd ff ff jns 894 <vprintk+0x44>
b5d: a1 00 00 00 00 mov 0x0,%eax
b62: c7 05 0c 00 00 00 00 movl $0x0,0xc
b69: 00 00 00
b6c: c7 05 4c 00 00 00 00 movl $0x0,0x4c
b73: 00 00 00
b76: c7 05 50 00 00 00 01 movl $0x1,0x50
b7d: 00 00 00
b80: a3 10 00 00 00 mov %eax,0x10
b85: c7 05 54 00 00 00 54 movl $0x54,0x54
b8c: 00 00 00
b8f: c7 05 58 00 00 00 54 movl $0x54,0x58
b96: 00 00 00
b99: e9 f6 fc ff ff jmp 894 <vprintk+0x44>
b9e: c7 05 e4 00 02 00 01 movl $0x1,0x200e4
ba5: 00 00 00
ba8: c7 45 bc 00 00 00 00 movl $0x0,-0x44(%ebp)
baf: e9 01 fe ff ff jmp 9b5 <vprintk+0x165>
bb4: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
bba: 8d bf 00 00 00 00 lea 0x0(%edi),%edi
comment:7 by , 16 years ago
| Summary: | Linux 2.6.26.* crashes at boot (kernel panic) → Linux 2.6.26.* crashes at boot (kernel panic) -> fixed in 2.0.2 |
|---|
Should be fixed now. It was indeed a VirtualBox problem. The recompiler didn't notice the instruction modifications made by the paravirtops part.
comment:8 by , 16 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
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A Debian guy found out that things improve a lot if the following changeset is removed from the Linux kernel sources: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e587cadd8f47e202a30712e2906a65a0606d5865