>Number: 166193
>Category: kern
>Synopsis: FB 8.0 freeze during the kernel dump
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Mar 17 04:00:23 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Zhouyi Zhou
>Release: FB 8.0
>Organization:
www.ict.ac.cn
>Environment:
FreeBSD 8.0-RELEASE FreeBSD 8.0-RELEASE
>Description:
FreeBSD 8.0 will freeze during the kernel panic memory dump.
>How-To-Repeat:
Allocate a large memory, trigger a kernel panic, and let it dump
>Fix:
I use self developed instrument code to prevent dead lock and find the cpu
which is used for dumping is seized by ehci_interrupt which is locked up.
The fix is to add a critical_enter() in function doadump.
btw: following is my dirty and quick instrument code:
#define TRACELEVEL 5
void
lapic_handle_intr(int vector, struct trapframe *frame)
{
struct intsrc *isrc;
#ifdef TRACELEVEL
char tfip[20];
if (1/*vector == 0x30*/){
int i = 0;
int j = 0;
int cpuid = PCPU_GET(cpuid);
struct amd64_frame * frame1;
if (!INKERNEL(frame->tf_rip))
goto out;
frame1 = (struct amd64_frame *) (frame->tf_rbp);
sprintf(tfip, "%x\n", frame->tf_rip);
for (i = 0; i < 8; i++){
*(((unsigned char *)0xffffffff800b8000) + cpuid*300 + j*9*2
+ i*2) = tfip[i];
if (*((unsigned char *)0xffffffff800b8001 + cpuid*300 + j*9*2
+ i*2) != 121)
*((unsigned char *)0xffffffff800b8001 + cpuid*300 +
j*9*2 + i*2) = 121;
else
*((unsigned char *)0xffffffff800b8001 + cpuid*300 +
j*9*2 + i*2) = 120;
}
*(((unsigned char *)0xffffffff800b8000) + cpuid*300 + j*9*2 + 8*2) =
' ';
*((unsigned char *)0xffffffff800b8001 + cpuid*300 + j*9*2 + 8*2) =
121;
j = 1;
while (j <= TRACELEVEL){
if (!INKERNEL((long)frame1))
goto out;
sprintf(tfip, "%x\n", frame1->f_retaddr);
for (i = 0; i < 8; i++){
*(((unsigned char *)0xffffffff800b8000) +cpuid*300 +
j*9*2 + i*2) = tfip[i];
if (*((unsigned char *)0xffffffff800b8001 + cpuid*300
+j*9*2 + i*2) != 121)
*((unsigned char *)0xffffffff800b8001 +
cpuid*300 +j*9*2 + i*2) = 121;
else
*((unsigned char *)0xffffffff800b8001 +
cpuid*300 +j*9*2 + i*2) = 120;
}
*(((unsigned char *)0xffffffff800b8000) + cpuid*300 +j*9*2 +
8*2) = ' ';
*((unsigned char *)0xffffffff800b8001 +cpuid*300 + j*9*2 +
8*2) = 121;
frame1 = frame1->f_frame;
j++;
}
}
}
out:
#endif
if (vector == -1)
panic("Couldn't get vector from ISR!");
isrc = intr_lookup_source(apic_idt_to_irq(PCPU_GET(apic_id),
vector));
intr_execute_handlers(isrc, frame);
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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